WO2025185412A1 - Terminal device - Google Patents

Abstract

Provided in the present application is a terminal device, which comprises a metal ground plane, a radiating element and a feed source. The radiating element is arranged adjacent to and in parallel with a predetermined side of the metal ground plane, and the projection thereof on the predetermined side of the metal ground plane is located within the predetermined side. The radiating element comprises at least one connection portion connected to the predetermined side of the metal ground plane. The feed source is electrically connected to the radiating element and is used for exciting the radiating element to generate an excitation current conducted in a first direction, so that the predetermined side of the metal ground plane generates a ground plane current, wherein the direction of the ground plane current in a first region in the predetermined side of the metal ground plane corresponding to the radiating element is a second direction, and the direction of the ground plane current in a second region in the predetermined side of the metal ground plane is the first direction, the second region being adjacent to the first region, and the second direction being opposite to the first direction. The radiating element comprises a main element of which the electrical length is 1/2 of the wavelength corresponding to a preset frequency band. Such a current distribution reduces the directivity coefficient after vector superposition of far-field radiation electric fields, thereby improving the omnidirectionality of antennas.

Description

terminal equipment

This application claims priority to the Chinese patent application filed with the China Patent Office on March 6, 2024, with application number 202410257484.1 and application name “Terminal Device”, the entire contents of which are incorporated by reference into this application.

Technical Field

The present application relates to the field of electronic equipment, and in particular to a terminal device.

Background Art

Some current terminal devices often use internal antennas such as IFAs, left-hand antennas, and monopoles. Under the same clearance conditions, these antennas have low efficiency, narrow single-mode resonant bandwidth, and strong floor currents, which significantly degrade the antenna pattern. This results in poor antenna directivity, limited directional range, and low omnidirectionality.

Summary of the Invention

To this end, the present application provides a terminal device to provide a more suitable antenna body and ground current, thereby improving the omnidirectionality of the antenna.

The present application provides a terminal device, which includes a metal floor, a radiating branch, and a feed source; the radiating branch is adjacent to and parallel to a preset edge of the metal floor, and its projection on the preset edge of the metal floor is located within the preset edge, wherein the radiating branch includes at least one connection portion, and the at least one connection portion is connected to the preset edge of the metal floor; the feed source is electrically connected to the radiating branch, and is used to excite the radiating branch to generate an excitation current conducted along a first direction, so that the radiating branch supports the transmission and reception of electromagnetic wave signals in a preset frequency band, and causes the preset edge of the metal floor to generate a floor current, wherein the direction of the floor current in a first area of the preset edge of the metal floor corresponding to the radiating branch is a second direction, and the direction of the floor current in a second area of the preset edge of the metal floor is a first direction, wherein the second area is an area adjacent to the first area, and the second direction is opposite to the first direction; wherein the radiating branch includes a main branch, and the electrical length of the main branch is 1/2 of the wavelength corresponding to the preset frequency band.

Compared to the current generated by conventional antennas in the prior art, i.e., the current in the second region near the predetermined edge of the metal floor is not always in the same direction as the current on the radiating branch, and the floor current on the metal floor has a longer period. In this application, since the antenna radiation pattern is the sum of the far-field radiation electric field vectors of all excited current elements, and the electrical length of the main branch is 1/2 of the wavelength corresponding to the center frequency of the predetermined frequency band, the direction of the floor current in the second region of the predetermined edge of the metal floor and the direction of the excitation current on the radiating branch are both in the first direction during resonance, while the direction of the floor current in the first region of the predetermined edge of the metal floor is in the second direction. The second region is the region near the first region, and the second direction is opposite to the first direction. In other words, the excitation current on the radiating branch is all in the first direction, and the floor current on both sides of the radiating branch is in the same direction as the excitation current on the radiating branch, while the floor current at the position corresponding to the radiating branch is in the opposite direction. This current distribution reduces the directivity coefficient after the superposition of the far-field radiation electric field vectors. Thus, compared to the prior art, the antenna directivity coefficient can be reduced, and the antenna's omnidirectionality can be improved.

In a possible implementation, the preset frequency band is 2.4 GHz. Since the omnidirectionality of the antenna is improved, when the terminal device communicates in the 2.4 GHz frequency band, the terminal device can well transmit and receive electromagnetic wave signals in all directions.

In one possible embodiment, the main branch includes a first branch and a second branch, and there is a first gap between the first branch and the second branch. The first branch and the second branch are spaced apart from each other by the gap and are symmetrically arranged on both sides of the gap. The at least one connection part of the radiating branch is the end of the first branch and the second branch away from the first gap, and the ends of the first branch and the second branch away from the first gap are both connected to the metal floor; the feed source is electrically connected to the first branch and/or the second branch, and the feed source is used to excite the first branch and/or the second branch so that an excitation current conducted along the first direction is generated on the first branch and the second branch, so that the first branch and the second branch support the transmission and reception of electromagnetic wave signals in the preset frequency band. Since the closer the current on the antenna is to the dipole current, the lower the directivity coefficient and the higher the omnidirectionality of the antenna, the first branch and the second branch are separated from each other by the first gap and are symmetrically arranged on both sides of the first gap, so that the main branch structure is a dipole antenna structure, so that the current generated on the main branch is a dipole current, and the lower the directivity coefficient, the higher the omnidirectionality of the antenna.

In one possible embodiment, the feed source is electrically connected to the first branch, and is used to excite the first branch to generate an excitation current that conducts along the first direction, and to excite the second branch to generate an excitation current that conducts along the first direction through coupling with the first gap. Thus, the main branch as a whole generates an excitation current that conducts along the first direction.

In one possible implementation, the feed source is connected to the first branch and the second branch, and is configured to output two feed signals with opposite phases to the first branch and the second branch, respectively, so that the excitation currents on the first branch and the second branch are both conducted in the first direction. Thus, the main branch as a whole presents an excitation current conducted in the first direction.

In one possible embodiment, the feed source includes a first feed source and a second feed source, the first feed source being electrically connected to the first branch, the second feed source being electrically connected to the second branch, and the first feed source and the second feed source providing feed signals to the first branch and the second branch, respectively, with the feed signals provided by the first feed source and the second feed source having opposite phases, so that both the first branch and the second branch generate an excitation current in the first direction. Thus, the main branch as a whole presents an excitation current conducted in the first direction.

In one possible embodiment, the main branch includes a first end and a second end opposite each other, and the radiating branch further includes a first parasitic branch and a second parasitic branch. The first parasitic branch and the second parasitic branch are both arranged parallel to the main branch, one end of each of the first and second parasitic branches is respectively arranged adjacent to the first and second ends of the main branch, and a gap is formed between each of the first and second parasitic branches and the main branch. The at least one connection portion of the radiating branch is an end of the first and/or second parasitic branch distal from the main branch, and the other end of each of the first and/or second parasitic branches is connected to the metal floor. Adding the first and second parasitic branches can enhance radiation efficiency. Furthermore, because the first and second parasitic branches are both arranged parallel to the main branch, and one end of each of the first and second parasitic branches is respectively arranged adjacent to the first and second ends of the main branch, the electrical length of the antenna structure can be increased, dispersing electrical energy, thereby reducing the directivity coefficient and improving the omnidirectionality of the antenna.

In one possible implementation, the first parasitic branch and the second parasitic branch are symmetrical about the center of the main branch. A more symmetrical antenna structure can result in a more symmetrical excitation current, thereby reducing the directivity coefficient and increasing the omnidirectionality of the antenna. Therefore, the symmetry between the first and second parasitic branches about the center of the main branch can reduce the directivity coefficient and increase the omnidirectionality of the antenna.

In one possible embodiment, the main branch includes a first branch and a second branch, a first gap being defined between the first branch and the second branch, the first branch and the second branch being spaced apart by the first gap and symmetrically disposed on either side of the first gap, the ends of the first branch and the second branch being separated from each other being the first end and the second end, the first parasitic branch and the second parasitic branch being both connected to the metal floor; the feed source being connected to the first branch and the second branch, respectively, and outputting two feed signals with opposite phases to the first branch and the second branch, respectively, so that excitation currents conducted along the first direction are generated on the first parasitic branch, the first branch, the second branch, and the second parasitic branch. Consequently, the current in the entire radiating branch is conducted along the first direction.

In one possible embodiment, the main branch is a continuous branch, the second parasitic branch is connected to the metal floor, and the feed source is electrically connected to the first parasitic branch. The feed source is used to provide a feed signal to the first parasitic branch, thereby exciting the first parasitic branch to generate an excitation current that conducts along the first direction. Furthermore, the feed source excites the main branch to generate an excitation current that conducts along the first direction through coupling via a second gap between the first parasitic branch and the main branch, and excites the second parasitic branch to generate an excitation current that conducts along the first direction through coupling via a third gap between the main branch and the second parasitic branch. Consequently, the first parasitic branch, the main branch, and the second parasitic branch all generate excitation currents that conduct along the first direction. Thus, the excitation current of the entire antenna structure is conducted along the first direction, and feeding is facilitated.

In one possible embodiment, one of the at least one connection point is the midpoint of the main branch, which is connected to the metal floor. This achieves electrostatic shielding and increases bandwidth. Furthermore, because the midpoint of the main branch is a point of high current and low voltage, connecting the midpoint of the main branch to the metal floor does not affect the conduction direction of the current in the main branch.

In one possible embodiment, the metal floor includes a notch defined in a first region of the predetermined edge, the notch comprising a first edge, a second edge, and a third edge. One end of each of the first and second edges is connected to the third edge, and the other ends of each of the first and second edges are connected to the predetermined edge. The predetermined edge and the radiating branch are collinear, the first edge forms an angle with each of the third edge and the predetermined edge, and the second edge forms an angle with each of the third edge and the predetermined edge. The first parasitic branch is located between the main branch and the first edge, and the second parasitic branch is located between the main branch and the second edge. Another of the at least one connection locations is an end of the second parasitic branch, a fourth gap is defined between the first parasitic branch and the first edge, and the end of the second parasitic branch is connected to the metal floor. Due to the fourth gap between the first parasitic branch and the first edge, the radiating branch can operate in the 5GHz-7GHz band in addition to the 2.4GHz band, thereby also being applicable to WiFi-6E and WiFi7, allowing the antenna to cover both high and low WiFi frequencies.

In one possible implementation, the electrical lengths of the first and second parasitic branches are both less than or equal to 1/4 of the wavelength corresponding to the preset frequency band. Because when the electrical lengths of the first and second parasitic branches are greater than 1/4 of the wavelength corresponding to the preset frequency band, current in the antenna structure cannot be entirely conducted in the first direction, resulting in an increase in the directivity coefficient. Therefore, by ensuring that the electrical lengths of the first and second parasitic branches are less than or equal to 1/4 of the wavelength corresponding to the preset frequency band, an increase in the directivity coefficient can be avoided.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

FIG1 is a schematic diagram showing the distribution of IFA antenna current and metal floor current in the prior art;

FIG2 is a schematic diagram of the current conduction direction of the IFA antenna and the current conduction direction of the metal floor in the prior art;

FIG3 is a schematic diagram of the radiation direction of an IFA antenna in the prior art;

FIG4 is a schematic diagram of the radiation direction of an IFA antenna in the prior art when operating at 2.7 GHz;

FIG5 is a schematic diagram of the structure of a terminal device provided in some embodiments of the present application;

FIG6 is a schematic diagram of the current conduction direction on the radiation branch and the metal floor provided by some embodiments of the present application;

FIG7 is an antenna pattern of the terminal device 100 when operating in a preset frequency band in some embodiments;

FIG8 is another antenna pattern when the terminal device in some embodiments of the branch node operates in a preset frequency band;

FIG9 is a schematic diagram of a partial structure of a terminal device in a first specific example provided by some embodiments of the present application;

FIG10 is a schematic diagram of a partial structure of a terminal device in a second specific example provided by some embodiments of the present application;

FIG11 is a schematic diagram of a partial structure of a terminal device in a third specific example provided by some embodiments of the present application;

FIG12 is a schematic diagram of a partial structure of a terminal device in a fourth specific example provided by some embodiments of the present application;

FIG13 is a schematic diagram of a partial structure of a terminal device in a fifth specific example provided by some embodiments of the present application;

FIG14 is a schematic diagram of a partial structure of a terminal device in a sixth specific example provided by some embodiments of the present application;

FIG15 is a diagram of radiation efficiency of a terminal device operating in a preset frequency band provided by some embodiments of the present application;

FIG16 is a current distribution diagram of one of the terminal devices provided in some embodiments of the present application when operating in a preset frequency band;

FIG17 is a current distribution diagram of another terminal device provided in some embodiments of the present application when operating in a preset frequency band;

FIG18 is a directional diagram of some terminal devices provided in some embodiments of the present application when operating in a preset frequency band;

FIG19 is an S-parameter curve diagram of a terminal device provided by some embodiments of the present application;

FIG20 is a voltage simulation diagram corresponding to the midpoint of the main branch corresponding to the antenna structure of FIG14;

FIG21 is a current simulation diagram corresponding to the midpoint of the main branch node corresponding to the antenna structure of FIG14;

FIG22 is a schematic diagram of a partial structure of a seventh terminal device provided in some embodiments of the present application;

FIG23 is a curve showing S parameters and radiation efficiency of a terminal device provided by some embodiments of the present application;

FIG24 is a schematic diagram of current flow in the antenna structure of FIG22 operating at 5 GHz;

FIG25 is a schematic diagram of current flow of the antenna structure of FIG22 operating at 6.5 GHz;

FIG26 is an equivalent circuit of the antenna structure of FIG22 achieving dual resonance in the 5 GHz-7 GHz range;

FIG27 is an impedance diagram of the antenna structure in FIG22 operating at 4-5 GHz.

DETAILED DESCRIPTION

The embodiments of the present application are described below with reference to the accompanying drawings.

In the embodiments of the present application, the terms "first", "second", etc. are used to distinguish different objects rather than to describe a specific order. In addition, the terms "upper", "lower", "inner", "outer", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present application.

In the embodiments of this application, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or internal communication between two components; it can be a communication connection; it can be an electrical connection. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

Please refer to Figures 1 to 4 in combination. Figure 1 is a schematic diagram of the distribution of the IFA antenna current and the metal floor current in the prior art; Figure 2 is a schematic diagram of the current conduction direction of the IFA (Inverted F Antenna) antenna and the metal floor current in the prior art; Figure 3 is a schematic diagram of the radiation direction of the IFA antenna in the prior art when operating at 2.54 GHz; Figure 4 is a schematic diagram of the radiation direction of the IFA antenna in the prior art when operating at 2.7 GHz.

For some terminal devices, IFA antennas, left-hand antennas or monopole antennas are usually set for communication. However, for terminal devices with a smaller clearance environment, the communication efficiency through these antennas is low, the single-mode resonant bandwidth is low, the metal floor current is strong, and the metal floor current seriously deteriorates the radiation pattern, resulting in a high directivity coefficient and insufficient antenna omnidirectionality, which also affects the PSD regulatory limit. Specifically, as shown in Figure 1, there is current distributed in the edge area adjacent to the IFA antenna on the metal floor, and the current cycle is relatively large. As shown in Figure 2, the current on the IFA antenna is conducted in a first direction, and the current at the position corresponding to the IFA antenna on the metal floor is conducted in a second direction. Some of the currents in other areas of the metal floor close to the position corresponding to the IFA antenna are conducted in the first direction, and some are conducted in the second direction. Therefore, there are more currents in the opposite direction of the IFA antenna current and the floor current. As shown in Figure 3, the directivity coefficient of the antenna is 4.447dBi when operating at a frequency of 2.54GHz. The directivity coefficient is relatively high, which will result in fewer directions of the antenna and lower omnidirectionality. As shown in FIG. 4 , the directivity coefficient of the antenna is 6.921 dBi when operating at a frequency of 2.7 GHz. Therefore, the directivity coefficient is relatively high, which also results in relatively low omnidirectionality of the antenna at 2.7 GHz.

It can be seen that the antenna structure in the prior art has a high directivity coefficient at multiple frequencies, resulting in low omnidirectionality at multiple frequencies, and cannot meet the requirements for antenna omnidirectionality in certain scenarios.

Please refer to Figures 5 and 6 in combination. Figure 5 is a structural diagram of a terminal device provided in some embodiments of the present application; Figure 6 is a schematic diagram of the current conduction direction on the radiation branch and the metal floor provided in some embodiments of the present application.

As shown in Figures 5 and 6, the present application provides a terminal device 100, which can be but is not limited to a terminal device with communication functions such as a computer, tablet or mobile phone. Specifically, the terminal device 100 also supports WiFi communication. By adjusting the structure of the antenna in the terminal device 100 to adjust the current distribution when the antenna is working, the directivity coefficient is reduced and the omnidirectionality of the antenna is improved.

In some embodiments, as shown in Figures 5 and 6, the terminal device 100 includes a metal floor 10, a radiating branch 20, and a feed source 30. The radiating branch 20 is adjacent to and parallel to a predetermined edge 101 of the metal floor 10, and its projection on the predetermined edge 101 of the metal floor 10 is located within the predetermined edge 101. The radiating branch 20 includes at least one connection portion 201, and the at least one connection portion 201 is connected to the predetermined edge 101 of the metal floor 10. As shown in Figures 5 and 6, the feed source 30 is electrically connected to the radiating branch 20, and is used to excite the radiating branch 20 to generate an excitation current i1 conducted along a first direction d1, so that the radiating branch 20 supports the transmission and reception of electromagnetic wave signals in a preset frequency band, and causes the preset edge 101 of the metal floor 10 to generate a floor current i2, wherein the direction of the floor current i2 in the first area A1 corresponding to the radiating branch 20 in the preset edge 101 of the metal floor 10 is the second direction d2, and the direction of the floor current i2 in the second area A2 in the preset edge 101 of the metal floor 10 is the first direction d1, wherein the second area A2 is an area adjacent to the first area A1, and the second direction d2 is opposite to the first direction d1, wherein the radiating branch 20 includes a main branch 21, and the electrical length of the main branch 21 is 1/2 of the wavelength corresponding to the center frequency of the preset frequency band.

Compared with the current generated by the commonly used antenna in the prior art in the aforementioned Figure 2, that is, the current in the second area near the preset edge of the metal floor is not all in the same direction as the current on the radiation branch, and the floor current has more periods on the metal floor. In the present application, as shown in Figure 6, since the antenna radiation pattern is the sum of the electric field vectors of all excited current elements in the far field radiation, when the radiation branch 20 includes at least one connection portion 201 to connect to the preset edge 101 of the metal floor 10, and the electrical length of the main branch 21 is 1/2 of the wavelength corresponding to the center frequency of the preset frequency band, the floor current i in the second area A2 in the preset edge 101 of the metal floor 10 during resonance can be 2 and the excitation current i1 on the radiating branch 20 are both in the first direction d1. The direction of the floor current i2 in the first area A1 of the preset edge 101 of the metal floor 10 is in the second direction d2. The second area A2 is an area close to the first area A1, and the second direction d2 is opposite to the first direction d1. In other words, the excitation current i1 on the radiating branch 20 is in the first direction d1, and the floor current i2 on both sides of the radiating branch 20 is in the same direction as the excitation current i1 on the radiating branch 20, while the floor current i2 at the position corresponding to the radiating branch 20 is in the opposite direction. This current distribution reduces the directivity coefficient after the far-field radiation electric field vectors are superimposed. Therefore, compared with the existing technology, the antenna directivity coefficient can be reduced, and the omnidirectionality of the antenna can be improved.

In some embodiments, the first direction is parallel to the extension direction of the radiation branch 20, that is, the excitation current is mainly conducted along the extension direction of the radiation branch 20. In some embodiments, when the radiation branch 20 includes a main branch 21, the extension direction of the main branch 21 is also the first direction, and the excitation current is conducted along the extension direction of the main branch 21 while maintaining the first direction.

Among them, the electrical length of the main branch node 21 is 1/2 of the wavelength corresponding to the center frequency of the preset frequency band, which does not mean that the electrical length of the main branch node 21 is strictly 1/2 of the wavelength corresponding to the center frequency of the preset frequency band. For example, the electrical length of the main branch node 21 can be (1/2±1/10) of the wavelength corresponding to the preset frequency band, which can be regarded as 1/2 of the wavelength corresponding to the center frequency of the preset frequency band.

As shown in FIG6 , the feed source 30 is electrically connected to the radiating branch 20 and is configured to excite the radiating branch 20 to generate an excitation current i1 that is conducted along a first direction d1. The first direction d1 may be, for example, a direction parallel to and facing leftward from the perspective of FIG6 . The feed source 30 also causes the predetermined edge 101 of the metal floor 10 to generate a floor current i2. The floor current i2 in the first area A1 corresponding to the radiating branch 20 is directed in a second direction d2. The floor current i2 in the second area A2 of the predetermined edge 101 of the metal floor 10 is directed in the first direction d1. The second direction d2 may be, for example, a direction parallel to and facing rightward from the perspective of FIG6 .

In other embodiments, the first direction may also be the right direction of the perspective shown in Figure 6, and the second direction may be the left direction of the perspective shown in Figure 6. It is only necessary to ensure that the direction of the floor current in the first area A1 corresponding to the radiation branch 20 is the first direction, and the direction of the floor current in the second area A2 in the preset edge 101 of the metal floor 10 is the second direction, wherein the second area A2 is an area adjacent to the first area A1, and the second direction is opposite to the first direction.

Please refer to Figures 7 and 8. Figure 7 illustrates an antenna pattern when a terminal device operates in a preset frequency band in some embodiments; Figure 8 illustrates another antenna pattern when a terminal device operates in a preset frequency band in some embodiments. Specifically, Figure 7 may be a plan view of the three-dimensional pattern when the terminal device operates in the preset frequency band, taken on the XOY plane; and Figure 8 may be a plan view of the three-dimensional pattern when the terminal device operates in the preset frequency band, taken on the XOZ plane.

As shown in Figures 7 and 8, when the terminal device 100 operates in the preset frequency band, the directivity coefficient in the XOY plane and the XOZ plane is 1.986dBi. Compared with the directional diagrams in the prior art in Figures 3 and 4, the antenna radiation energy in this application is more evenly distributed in all directions and has better omnidirectionality.

It can be seen that after adopting the above structure, the terminal device 100 of the present application generates an excitation current i1 and a floor current i2 by exciting the radiation branch 20 and the metal floor 10 respectively, and after forming the above current distribution, it can effectively reduce the antenna directivity coefficient, and make the radiation energy in each direction more balanced, thereby improving the omnidirectionality of the antenna.

7 and 8 illustrate the case where the center frequency of the preset frequency band is 2.14 GHz, that is, the terminal device 100 operates at 2.14 GHz. Obviously, in some embodiments, the preset frequency band may be other frequency bands.

The metal floor 10 is at least partially made of conductive material.

In this application, "parallel" can mean completely parallel or approximately parallel. For example, when there is a certain angle between the two and the angle is small, for example, the angle is within the range of 0 to 30 degrees, it can still be called parallel.

In this application, the preset edge 101 of the metal floor 10 refers to the edge area of the metal floor 10, rather than a line. That is, in order to generate a floor current i2 at the preset edge 101 of the metal floor 10, the floor current may be generated at the corresponding edge area where the preset edge 101 of the metal floor 10 is located.

The shape of the terminal device 100 may be, but is not limited to, a rectangle, etc. Two adjacent sides of the rectangle may be connected by a straight line or by an arc transition.

In some embodiments, as shown in Figures 5 and 6 , the terminal device 100 is rectangular in shape, having two opposing long sides and two opposing short sides, and the metal floor 10 is also rectangular in shape. The predetermined side 101 can be a side of the metal floor 10 that is close to and parallel to the long side of the terminal device 100, or a side of the metal floor 10 that is close to and parallel to the short side of the terminal device 100. Accordingly, the radiating branches 20 can be disposed adjacent to either the short side or the long side of the terminal device 100.

Here, “the projection of the radiating branch 20 on the preset side 101 of the metal floor 10 is located within the preset side 101” can be understood as follows: when the radiating branch 20 is disposed adjacent to the short side of the terminal device 100, the length of the radiating branch 20 is less than the short side of the terminal device 100 and the length of the preset side 101; when the radiating branch 20 is disposed adjacent to the long side of the terminal device 100, the length of the radiating branch 20 is less than the long side of the terminal device 100 and the length of the preset side 101. In some embodiments, regardless of whether the radiating branch 20 is disposed adjacent to the short side or the long side of the terminal device 100, the length of the radiating branch 20 is less than the length of the short side of the terminal device 100 and is less than the length of the preset side 101.

In some embodiments, since the projection of the radiating branch 20 onto the predetermined edge 101 of the metal floor 10 is located within the predetermined edge 101, when the radiating branch 20 is disposed adjacent to the predetermined edge 101 of the metal floor 10, the radiating branch 20 may be disposed in a middle region adjacent to the predetermined edge 101, as shown in FIG6 . Disposing the radiating branch 20 in the middle region adjacent to the predetermined edge 101 may mean that the projection of the midpoint of the radiating branch 20 onto the predetermined edge 101 substantially coincides with the midpoint of the predetermined edge 101, and the projection of the radiating branch 20 onto the predetermined edge 101 is located within the middle region of the predetermined edge 101. The middle region of the predetermined edge 101 may have a certain length, for example, a length greater than or equal to that of the radiating branch 20, and the distances between the ends of the middle region along the extension direction of the predetermined edge 101 and the ends of the predetermined edge 101 are substantially equal. In other embodiments, the radiation branch 20 may also be arranged at a position adjacent to an edge region of the preset edge 101 , wherein the edge region refers to any region between an end point of the preset edge 101 and the middle region.

In some embodiments, the metal floor 10 may also be rectangular in shape and slightly smaller than the size of the terminal device 100. The metal floor 10 may also include two opposing short sides and two opposing long sides. The two short sides of the metal floor 10 are respectively adjacent to the two short sides of the terminal device 100, and the two long sides of the metal floor 10 are respectively adjacent to the two long sides of the terminal device 100. In some embodiments, when the radiating branches 20 are disposed adjacent to the long sides of the terminal device 100, they may be disposed on either side of the long sides of the terminal device 100, close to the short sides. Thus, the radiating branches 20 are also generally disposed adjacent to the long sides of the metal floor 10, and are disposed on either side of the long sides of the metal floor 10, close to the short sides, i.e., close to the edge of the predetermined side 101. If other electronic components are disposed in the middle region of the long sides of the terminal device 100, disposing the radiating branches 20 on either side of the long sides of the terminal device 100, close to the short sides, can avoid interference with other electronic components and ensure omnidirectional antenna radiation.

In some embodiments, the center frequency of the preset frequency band is 2.4 GHz. Due to the improved omnidirectionality of the antenna, when the terminal device communicates in the 2. GHz frequency band, electromagnetic wave signals can be well received and transmitted in all directions of the terminal device 100. When the preset frequency band is 2.4 GHz, the corresponding wavelength is 0.125 m. Therefore, the electrical length of the main branch 21 is 6.25 cm.

Please refer to Figures 9 to 11. Figure 9 is a partial structural diagram of a terminal device provided in some embodiments of the present application in a first specific example; Figure 10 is a partial structural diagram of a terminal device provided in some embodiments of the present application in a second specific example; and Figure 11 is a partial structural diagram of a terminal device provided in some embodiments of the present application in a third specific example.

In some embodiments, as shown in Figures 9-11, the main branch 21 includes a first branch 21a and a second branch 21b, and there is a first gap F1 between the first branch 21a and the second branch 21b. The first branch 21a and the second branch 21b are separated from each other by the first gap F1 and are symmetrically arranged on both sides of the first gap F1. At least one connection part 201 of the radiating branch 20 is the end of the first branch 21a and the second branch 21b away from the first gap F1. The ends of the first branch 21a and the second branch 21b away from the first gap F1 are connected to the metal floor 10; the feed source 30 is electrically connected to the first branch 21a and/or the second branch 21b, and the feed source 30 is used to excite the first branch 21a and/or the second branch 21b, so that the first branch 21a and the second branch 21b both generate an excitation current conducted along the first direction, so that the first branch 21a and the second branch 21b support the transmission and reception of electromagnetic wave signals in the preset frequency band. Since the closer the current on the antenna is to the dipole current, the lower the directivity coefficient and the higher the omnidirectionality of the antenna, the first branch 21a and the second branch 21b are spaced apart from each other by the first gap F1 and are symmetrically arranged on both sides of the first gap F1, so that the main branch 21 structure is a dipole antenna structure, so that the current generated on the main branch 21 is a dipole current, which in turn makes the directivity coefficient lower and the omnidirectionality of the antenna higher.

9 , when the main branch 21 includes a first branch 21a and a second branch 21b , the extension directions of the first branch 21a and the second branch 21b are both the first direction, and the first branch 21a and the second branch 21b are spaced apart along the first direction through the first gap F1 .

In some embodiments, as shown in FIG9 , the feed source 30 is electrically connected to the first branch 21 a. The feed source 30 is used to excite the first branch 21 a to generate an excitation current that is conducted along the first direction, and to excite the second branch 21 b to generate an excitation current that is conducted along the first direction through coupling with the first gap F1. Thus, the main branch 21 as a whole generates an excitation current that is conducted along the first direction.

In some embodiments, as shown in FIG10 , the feed source 30 is connected to both the first branch 21 a and the second branch 21 b. The feed source 30 is configured to output two feed signals of opposite phases to the first branch 21 a and the second branch 21 b, respectively, so that the excitation currents on the first branch 21 a and the second branch 21 b are both conducted in the first direction. Consequently, the main branch 21 as a whole presents an excitation current conducted in the first direction.

The feed source 30 has two output terminals, one of which is connected to the first branch 21a, and the other is connected to the second branch 21b. The two output terminals of the feed source 30 are used to output two feed signals with opposite phases.

Among them, the position where the first branch 21a is connected to one of the output ends of the feed source 30, and the position where the second branch 21b is connected to the other output end of the feed source 30 are symmetrical about the first slot F1. For example, the two output ends of the feed source 30 can be connected to the slot end of the first branch 21a and the slot end of the second branch 21b respectively. At this time, the structure of the terminal device 100 includes a dipole antenna structure with intermediate feeding. Since the feeding point is at the slot end of the first branch 21a and the slot end of the second branch 21b, which is located in the middle position of the main branch 21, the radiation pattern of the antenna is relatively symmetrical, and the current on the first branch 21a and the second branch 21b are similar or equal, thereby further reducing the directivity coefficient and improving the omnidirectionality of the antenna.

The slit end of the first branch 21 a refers to an end of the first branch 21 a close to the first slit F1 , and the slit end of the second branch 21 b refers to an end of the second branch 21 b close to the first slit F1 .

In some embodiments, the current provided by the same feed source can be divided into two paths by a power splitter, and then one of the current paths can be phase-shifted by 180° by a phase shifter, thereby providing two feed signals with opposite phases. In other embodiments, two feed sources can be used to provide two feed signals with opposite phases.

In some embodiments, as shown in FIG11 , the feed source 30 includes a first feed source 31 and a second feed source 32 . The first feed source 31 is electrically connected to the first branch 21 a , and the second feed source 32 is electrically connected to the second branch 21 b . The first feed source 31 and the second feed source 32 provide feed signals to the first branch 21 a and the second branch 21 b , respectively. The feed signals provided by the first feed source 31 and the second feed source 32 have opposite phases, so that both the first branch 21 a and the second branch 21 b generate an excitation current in the first direction. Thus, the main branch 21 as a whole presents an excitation current conducted along the first direction.

The connection position between the first feed source 31 and the first branch 21a is symmetrical with the connection position between the second feed source 32 and the second branch 21b about the first gap F1. In this case, the antenna can be more symmetrical, which is more conducive to reducing the directivity coefficient and improving the omnidirectionality of the antenna.

Please refer to Figures 12 to 17, Figure 12 is a partial structural diagram of the terminal device provided in some embodiments of the present application in the fourth specific example; Figure 13 is a partial structural diagram of the terminal device provided in some embodiments of the present application in the fifth specific example; Figure 14 is a partial structural diagram of the terminal device provided in some embodiments of the present application in the sixth specific example; Figure 15 is a radiation efficiency diagram of the terminal device provided in some embodiments of the present application working in a preset frequency band; Figure 16 is a current distribution diagram of one of the terminal devices provided in some embodiments of the present application when working in the preset frequency band; Figure 17 is a current distribution diagram of another terminal device provided in some embodiments of the present application when working in the preset frequency band; Figure 18 is a directional diagram of some terminal devices provided in some embodiments of the present application when working in the preset frequency band (Figures 10 and 12).

In some embodiments, as shown in Figures 12 to 14, the main branch 21 includes a first end 211 and a second end 212 relative to each other, and the radiating branch 20 also includes a first parasitic branch 22a and a second parasitic branch 22b. The first parasitic branch 22a and the second parasitic branch 22b are both arranged parallel to the main branch 21, and one end of the first parasitic branch 22a and the second parasitic branch 22b are respectively arranged adjacent to the first end 211 and the second end 212 of the main branch 21, and both have a gap between them and the main branch 21. The at least one connection part 201 of the radiating branch 20 is an end of the first parasitic branch 22a and/or the second parasitic branch 22b away from the main branch 21, and the other end of the first parasitic branch 22a and/or the second parasitic branch 22b is connected to the metal floor 10. As shown in FIG15 , when the terminal device 100 operates at 2.4 GHz, the radiation efficiency of the first parasitic branch and the second parasitic branch is higher. In addition, since the first parasitic branch 22a and the second parasitic branch 22b are both arranged in parallel with the main branch 21, and one end of the first parasitic branch 22a and the second parasitic branch 22b are respectively arranged adjacent to the first end 211 and the second end 212 of the main branch 21, the electrical length of the antenna structure can be increased, so that the electric energy is dispersed, thereby reducing the directivity coefficient and improving the omnidirectionality of the antenna. As shown in FIG16 and FIG17 , the antenna structure corresponding to FIG16 is the structure including the main branch 21, the first parasitic branch 22a and the second parasitic branch 22b as shown in FIG12 , while the antenna structure corresponding to FIG17 is the structure including the main branch 21 as shown in FIG10 . It can be seen from FIG16 and FIG17 that when the first parasitic branch 22a and the second parasitic branch 22b are included, the current distribution is more dispersed. As shown in Figure 18, the antenna structure including the main branch 21, the first parasitic branch 22a and the second parasitic branch 22b (as shown in Figure 12) has a more uniform radiation distribution in all directions compared to the antenna structure including only the main branch 21 (as shown in Figure 10), so the antenna has higher omnidirectionality.

In some embodiments, the first parasitic branch 22a and the second parasitic branch 22b are symmetrical about the center of the main branch 21. Since a more symmetrical antenna structure can make the excitation current more symmetrical, thereby lowering the directivity coefficient and increasing the omnidirectionality of the antenna, the symmetry between the first parasitic branch 22a and the second parasitic branch 22b about the center of the main branch 21 can reduce the directivity coefficient and improve the omnidirectionality of the antenna.

The extension directions of the first parasitic branch 22 a , the second parasitic branch 22 b and the main branch 21 are all parallel to the first direction. That is, the excitation current is mainly conducted along the extension direction of the radiation branch 20 .

In some embodiments, as shown in FIG. 12 to FIG. 14 , the first parasitic branch 22 a , the main branch 21 , and the second parasitic branch 22 b are sequentially arranged in a direction parallel to the first direction, and are generally arranged in a straight line.

In some embodiments, as shown in Figure 12, the main branch 21 includes a first branch 21a and a second branch 21b, and a first gap F1 is provided between the first branch 21a and the second branch 21b. The first branch 21a and the second branch 21b are spaced apart from each other by the first gap F1 and are symmetrically arranged on both sides of the first gap F1, and the ends of the first branch 21a and the second branch 21b away from each other are the first end 211 and the second end 212, and the first parasitic branch 22a and the second parasitic branch 22b are both connected to the metal floor 10; the feed source 30 is respectively connected to the first branch 21a and the second branch 21b, and outputs two feeding signals with opposite phases to the first branch 21a and the second branch 21b, so that an excitation current conducted along the first direction is generated on the first parasitic branch 22a, the first branch 21a, the second branch 21b and the second parasitic branch 22b. Therefore, the current of the entire radiation branch 20 is conducted along the first direction.

In some embodiments, as shown in Figure 12, the first parasitic branch 22a is arranged on the side of the first branch 21a away from the second branch 21b, and the second parasitic branch 22b is arranged on the side of the second branch 21b away from the first branch 21a. The extension directions of the first parasitic branch 22a, the first branch 21a, the second branch 21b and the second parasitic branch 22b are all parallel to the first direction, and are arranged in sequence along the direction parallel to the first direction, and are roughly in the shape of a "one".

In some embodiments, as described above, the at least one connection portion 201 of the radiating branch 20 is an end of the first parasitic branch 22a and/or the second parasitic branch 22b distal from the main branch 21. When the main branch 21 includes a first branch 21a and a second branch 21b, the at least one connection portion 201 of the radiating branch 20 is an end of the first parasitic branch 22a distal from the first branch 21a and/or an end of the second parasitic branch 22b distal from the second branch 21b. As shown in FIG. 12 , both the end of the first parasitic branch 22a distal from the first branch 21a and the end of the second parasitic branch 22b distal from the second branch 21b are connected to the metal floor 10.

In some embodiments, the feed source 30 outputs two feed signals with opposite phases to the first branch 21a and the second branch 21b respectively to stimulate the first branch 21a and the second branch 21b to generate an excitation current conducted along the first direction, and through coupling excitation, the first parasitic branch 22a and the second parasitic branch 22b are both generated to generate an excitation current conducted along the first direction.

In some embodiments, the position where the feed source 30 is connected to the first branch 21a is symmetrical to the position where the feed source 30 is connected to the second branch 21b, which can make the radiation pattern of the antenna relatively symmetrical, thereby reducing the directivity coefficient and improving the omnidirectionality of the antenna. For example, the feed source 30 is connected to the slot end of the first branch 21a and the slot end of the second branch 21b, respectively, wherein the slot end of the first branch 21a refers to the end of the first branch 21a close to the first slot F1, and the slot end of the second branch 21b refers to the end of the second branch 21b close to the first slot F1. Since the feeding point is located at the slot end of the first branch 21a and the slot end of the second branch 21b, which is located in the middle of the antenna structure, the radiation pattern of the antenna is relatively symmetrical, the currents on the first branch 21a and the second branch 21b are equal, and the currents on the first parasitic branch 22a and the second parasitic branch 22b are equal, thereby further reducing the directivity coefficient and improving the omnidirectionality of the antenna.

In some embodiments, as shown in Figure 13, the main branch 21 is a continuous branch, the second parasitic branch 22b is connected to the metal floor 10, and the feed source 30 is electrically connected to the first parasitic branch 22a. The feed source 30 is used to provide a feeding signal to the first parasitic branch 22a to excite the first parasitic branch 22a to generate an excitation current conducted along the first direction, and to couple the main branch 21 through the second gap F2 between the first parasitic branch 22a and the main branch 21 to excite the main branch 21 to generate an excitation current conducted along the first direction, and to couple the second parasitic branch 22b through the third gap F3 between the main branch 21 and the second parasitic branch 22b to generate an excitation current conducted along the first direction, so that the first parasitic branch 22a, the main branch 21 and the second parasitic branch 22b all generate an excitation current conducted along the first direction. As a result, the excitation current on the entire antenna structure is conducted along the first direction, and it is easy to feed. The feed source 30 can be set in the structure where the metal floor is located (such as a PCB board, etc.), and the feed source 30 is easily connected to the first parasitic branch 22a through a cable or a spring, etc., so it is easy to feed.

Please refer to Figures 14, 19-21. Figure 19 is an S-parameter curve diagram of the terminal device provided in some embodiments of the present application. Figure 20 is a voltage simulation diagram corresponding to the midpoint of the main branch corresponding to the antenna structure of Figure 14; Figure 21 is a current simulation diagram corresponding to the midpoint of the main branch corresponding to the antenna structure of Figure 14.

In some embodiments, as shown in FIG14 , one of the at least one connection portion 201 is the midpoint of the main branch 21, and the midpoint of the main branch 21 is connected to the metal floor 10. Thus, electrostatic shielding can be achieved. Moreover, as shown in FIG19 , after the midpoint of the main branch 21 is connected to the metal floor 10, the antenna can effectively operate within the range of 1.8 GHz to 2.4 GHz, thereby increasing the bandwidth. In addition, as shown in FIG20 and FIG21 , when the antenna operates at 2 GHz, since the midpoint of the main branch 21 is a point of high current and low voltage, with a voltage of approximately 2 V and a current of approximately 0.1 A, connecting the midpoint of the main branch 21 to the metal floor 10 does not affect the conduction direction of the current on the main branch 21.

Please refer to Figures 22 to 27, Figure 22 is a partial structural diagram of the seventh terminal device provided in some embodiments of the present application; Figure 23 is the S parameter and radiation efficiency curve of the terminal device provided in some embodiments of the present application; Figure 24 is a schematic diagram of the current flow direction of the antenna structure of Figure 22 working at 5GHz; Figure 25 is a schematic diagram of the current flow direction of the antenna structure of Figure 22 working at 6.5GHz; Figure 26 is an equivalent circuit of the antenna structure of Figure 22 realizing dual resonance in 5GHz-7GHz; Figure 27 is an impedance diagram of the antenna structure in Figure 22 working at 4-5GHz.

In some embodiments, as shown in Figure 22, the metal floor 10 includes a gap M opened in the first area A1 of the preset edge 101, and the gap M includes a first edge S1, a second edge S2 and a third edge S3, one end of the first edge S1 and the second edge S2 are respectively connected to the third edge S3, and the other ends of the first edge S1 and the second edge S2 are respectively connected to the preset edge 101, wherein the preset edge 101 and the radiating branch 20 are on the same straight line, the first edge S1 forms an angle with the third edge S3 and the preset edge 101, respectively, and the second edge S2 forms an angle with the third edge S3 and the preset edge 101, respectively; the other one of the at least one connection part 201 is the end of the second parasitic branch 22b, and there is a fourth gap F4 between the first parasitic branch 22a and the first edge S1, and the second parasitic branch 22b is connected to the metal floor 10. Since there is a fourth gap F4 between the first parasitic branch 22a and the first side S1, as shown in Figure 23, the radiation branch 20 shown in Figure 22 of this embodiment cooperates with the metal floor 10 to operate in the 5-7GHz frequency band in addition to the 2.4GHz frequency band, and can thus also be applied to WiFi-6E and WiFi7, so that the antenna covers both WiFi high and low frequencies.

As shown in FIG24 , it can be seen from the figure that the low-frequency current in the range of 5 GHz to 7 GHz is coupled back to the ground through the second gap F2, so that the structural part through which the low-frequency current in the range of 5 GHz to 7 GHz flows can be used as a low-frequency antenna structure in the range of 5 GHz to 7 GHz, and resonate in the low-frequency band in the range of 5 GHz to 7 GHz.

As shown in FIG25 , it can be seen from the figure that the high-frequency current in the range of 5 GHz to 7 GHz is coupled back to the ground through the fourth gap F4, so that the structural part through which the high-frequency current in the range of 5 GHz to 7 GHz flows can be used as a high-frequency antenna structure in the range of 5 GHz to 7 GHz, and resonate in the high-frequency frequency band in the range of 5 GHz to 7 GHz.

As shown in Figures 24 and 26, the first parasitic branch 22a in Figure 24 can be equivalent to the first inductor L1 in Figure 26, the second gap F2 can be equivalent to the first capacitor C1 in Figure 26, and the part of the main branch 21 from the second gap F2 to the connection with the metal floor 10 can be equivalent to the second inductor L2 in Figure 26. Therefore, the structural part through which the low-frequency current in the range of 5GHz-7GHz flows, that is, the antenna structure that can be used as a low-frequency antenna in the range of 5GHz-7GHz can be equivalent to an LC resonant circuit in which the first capacitor C1, the first inductor L1 and the second inductor L2 are connected in series, and can resonate at the low frequency in the range of 5GHz-7GHz.

As shown in Figures 25 and 26, the fourth gap F4 in Figure 25 is equivalent to the second capacitor C2 in Figure 26, and the metal floor 10 in Figure 25 is equivalent to the third inductor L3 in Figure 26. Therefore, the structural part through which the high-frequency current in the range of 5GHz-7GHz flows can be used as an antenna structure for the high frequency in the range of 5GHz-7GHz, and can be equivalent to an LC resonant circuit in which the second capacitor C2 and the third inductor L3 are connected in series, and can resonate at the high frequency in the range of 5GHz-7GHz.

As shown in Figure 27, Figure 27 is an impedance diagram of the radiating branch in Figure 22 operating at 4-5GHz. By adjusting the length of the second gap F2 between the first parasitic branch 22a and the main branch 21, or the area of the surface opposite to the main branch 21, the capacitance value of the first capacitor C1 equivalent to the second gap F2 is adjusted, and then the frequency point corresponding to the impedance in the impedance circle formed by "circling" in the impedance curve is adjusted, so as to perform impedance matching and select a specific frequency band for transmitting and receiving electromagnetic wave signals. Among them, "circling" refers to the circles formed by the impedance curve in Figure 27. These "circles" represent the changes in the impedance value of the antenna at different frequencies. These circles are usually caused by the impedance mismatch between the antenna and the transmission line or load. When the impedance is mismatched, the signal will be partially reflected back to the antenna system, resulting in the formation of a "circle" on the impedance plane.

By adjusting the length of the fourth gap F4 between the first parasitic branch 22a and the first side S1, or the area of the surface opposite to the first parasitic branch 22a and the first side S1, the capacitance value of the second capacitor C2 equivalent to the fourth gap F4 is adjusted, thereby adjusting the size of the impedance loop in the impedance curve, and then changing the impedance matching. The different sizes of the impedance loops indicate that the impedance of the antenna is different at different frequencies or different electrical lengths.

In some embodiments, as shown in Figures 12-14, the electrical lengths of the first parasitic stub 22a and the second parasitic stub 22b are less than or equal to 1/4 of the wavelength corresponding to the preset frequency band. Because when the electrical lengths of the first parasitic stub 22a and the second parasitic stub 22b are greater than 1/4 of the wavelength corresponding to the preset frequency band, the current in the antenna structure cannot be entirely conducted in the first direction, resulting in an increase in the directivity coefficient. Therefore, the electrical lengths of the first parasitic stub 22a and the second parasitic stub 22b are less than or equal to 1/4 of the wavelength corresponding to the preset frequency band, thereby avoiding an increase in the directivity coefficient.

When the preset frequency band is 2.4 GHz, the wavelength corresponding to the preset frequency band of 2.4 GHz is 0.125 m. At this time, the electrical length of the first parasitic branch 22 a and the second parasitic branch 22 b is less than or equal to 3.125 cm.

In the aforementioned embodiments, the descriptions of each embodiment have different emphases. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. The various embodiments can also be adaptively combined into other new embodiments. Moreover, the embodiments described in this application are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

The above is an implementation method of the embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims (13)

A terminal device, comprising: Metal flooring; a radiating branch node, disposed adjacent to and parallel to a predetermined edge of the metal floor, and having a projection on the predetermined edge of the metal floor located within the predetermined edge, wherein the radiating branch node includes at least one connection portion, and the at least one connection portion is connected to the predetermined edge of the metal floor; A feed source is electrically connected to the radiating branch, and is used to excite the radiating branch to generate an excitation current conducted along a first direction, so that the radiating branch supports the transmission and reception of electromagnetic wave signals in a preset frequency band, and causes the preset edge of the metal floor to generate a floor current, wherein the direction of the floor current in the first area of the preset edge of the metal floor corresponding to the radiating branch is the second direction, and the direction of the floor current in the second area of the preset edge of the metal floor is the first direction, wherein the second area is an area adjacent to the first area, and the second direction is opposite to the first direction; wherein the radiating branch includes a main branch, and the electrical length of the main branch is 1/2 of the wavelength corresponding to the preset frequency band. The terminal device according to claim 1 is characterized in that the center frequency of the preset frequency band is 2.4 GHz. The terminal device according to any one of claims 1 or 2, characterized in that the main branch includes a first branch and a second branch, a first gap is defined between the first branch and the second branch, the first branch and the second branch are spaced apart from each other by the first gap and are symmetrically arranged on both sides of the first gap, the at least one connection portion of the radiating branch is an end of the first branch and the second branch away from the first gap, and the ends of the first branch and the second branch away from the first gap are both connected to the metal floor; The feed source is electrically connected to the first branch and/or the second branch, and is used to excite the first branch and/or the second branch so that an excitation current conducted along the first direction is generated on both the first branch and the second branch, so that the first branch and the second branch support the transmission and reception of electromagnetic wave signals in the preset frequency band. The terminal device according to claim 3 is characterized in that the feed source is electrically connected to the first branch, and the feed source is used to excite the first branch to generate an excitation current conducted along the first direction, and to excite the second branch through the first gap coupling to generate an excitation current conducted along the first direction. The terminal device according to claim 3 is characterized in that the feed source is connected to the first branch and the second branch, and the feed source is used to output two feed signals with opposite phases to the first branch and the second branch, respectively, so that the excitation currents on the first branch and the second branch are both conducted along the first direction. The terminal device according to claim 3 is characterized in that the feed source includes a first feed source and a second feed source, the first feed source is electrically connected to the first branch, the second feed source is electrically connected to the second branch, the first feed source and the second feed source provide feed signals to the first branch and the second branch respectively, and the phases of the feed signals provided by the first feed source and the second feed source are opposite, so that the first branch and the second branch both generate excitation current in the first direction. The terminal device according to claim 1 is characterized in that the main branch includes a first end and a second end relative to each other, and the radiating branch also includes a first parasitic branch and a second parasitic branch, the first parasitic branch and the second parasitic branch are both arranged parallel to the main branch, one end of the first parasitic branch and the second parasitic branch are respectively arranged adjacent to the first end and the second end of the main branch, and there is a gap between each and the main branch, the at least one connection part of the radiating branch is an end of the first parasitic branch and/or the second parasitic branch away from the main branch, and the other end of the first parasitic branch and/or the second parasitic branch is connected to the metal floor. The terminal device according to claim 7, wherein the first parasitic branch and the second parasitic branch are symmetrical about the center of the main branch. The terminal device according to claim 7 or 8 is characterized in that the main branch includes a first branch and a second branch, a first gap is provided between the first branch and the second branch, the first branch and the second branch are spaced apart from each other by the first gap and are symmetrically arranged on both sides of the first gap, and the ends of the first branch and the second branch away from each other are the first end and the second end, the first parasitic branch and the second parasitic branch are both connected to the metal floor; the feed source is connected to the first branch and the second branch respectively, and two feed signals with opposite phases are output to the first branch and the second branch respectively, so that an excitation current conducted along the first direction is generated on the first parasitic branch, the first branch, the second branch and the second parasitic branch. The terminal device according to claim 7 or 8 is characterized in that the main branch is a continuous branch, the second parasitic branch is connected to the metal floor, the feed source is electrically connected to the first parasitic branch, and the feed source is used to provide a feeding signal to the first parasitic branch to excite the first parasitic branch to generate an excitation current conducted along the first direction, and to excite the main branch to generate an excitation current conducted along the first direction through the second gap coupling between the first parasitic branch and the main branch, and to excite the second parasitic branch to generate an excitation current conducted along the first direction through the third gap coupling between the main branch and the second parasitic branch, so that the first parasitic branch, the main branch and the second parasitic branch all generate an excitation current conducted along the first direction. The terminal device according to claim 10, characterized in that one of the at least one connection parts is the midpoint of the main branch, and the midpoint of the main branch is connected to the metal floor. The terminal device according to claim 11 is characterized in that the metal floor includes a gap opened in the first area of the preset edge, the gap includes a first edge, a second edge and a third edge, one end of the first edge and the second edge are respectively connected to the third edge, and the other end of the first edge and the second edge are respectively connected to the preset edge, wherein the preset edge and the radiating branch are on the same straight line, the first edge forms an angle with the third edge and the preset edge respectively, the second edge forms an angle with the third edge and the preset edge respectively, the first parasitic branch is located between the main branch and the first edge, and the second parasitic branch is located between the main branch and the second edge; the other of the at least one connection part is the end of the second parasitic branch, there is a fourth gap between the first parasitic branch and the first edge, and the end of the second parasitic branch is connected to the metal floor. The terminal device according to claim 7 or 8 is characterized in that the electrical length of the first parasitic branch and the second parasitic branch are both less than or equal to 1/4 of the wavelength corresponding to the preset frequency band.