CN106816681A - A kind of housing, antenna assembly and mobile terminal - Google Patents

Abstract

In order to solve the problem of insufficient antenna design space in existing mobile terminals, the present invention provides a casing. An antenna line is formed on the casing, the antenna line includes a high-frequency branch and a low-frequency branch; the high-frequency branch includes a first part of the high-frequency branch and a second part of the high-frequency branch, and the first part of the high-frequency branch is located at the The inner surface of the housing, the second part of the high-frequency branch is located on the outer surface of the housing, the first part of the high-frequency branch and the second part of the high-frequency branch are connected through holes on the housing; the low-frequency branch It includes a first part of the low-frequency branch and a second part of the low-frequency branch, the first part of the low-frequency branch is located on the inner surface of the housing, the second part of the low-frequency branch is located on the outer surface of the housing, the first part of the low-frequency branch and the The second part of the low frequency branch is connected through a hole on the casing. The high frequency branch is provided with a first feed point, the low frequency branch is provided with a second feed point, and the first feed point and the second feed point are connected to each other.

Description

Housing, antenna device and mobile terminal

technical field

The invention relates to a mobile terminal casing, in particular to a mobile terminal casing with antenna lines on its surface.

Background technique

As electronic products such as mobile phones or wearable devices are becoming thinner and smaller, the antenna design space reserved in electronic products is getting smaller and smaller, and the structural design of the antenna is difficult and the antenna performance is difficult to meet the requirements.

Contents of the invention

In order to solve the technical problem that the antenna design space of the existing mobile terminal is insufficient and the performance of the antenna cannot meet the requirements, the invention provides a casing.

The housing is the shell of the mobile terminal, made of insulating material, including an inner surface and an outer surface;

An antenna line is formed on the casing, the antenna line includes a high-frequency branch and a low-frequency branch; the high-frequency branch includes a first part of the high-frequency branch and a second part of the high-frequency branch, and the first part of the high-frequency branch is located at the The inner surface of the housing, the second part of the high-frequency branch is located on the outer surface of the housing, the first part of the high-frequency branch and the second part of the high-frequency branch are connected through holes on the housing; the low-frequency branch It includes a first part of the low frequency branch and a second part of the low frequency branch, the first part of the low frequency branch is located on the inner surface of the housing, the second part of the low frequency branch is located on the outer surface of the housing, the first part of the low frequency branch and the The second part of the low-frequency branch is connected through a hole on the housing;

The first part of the high-frequency branch is provided with a first feed point away from the end connected to the via hole of the second part of the high-frequency branch;

The first part of the low frequency branch is provided with a second feed point away from the end connected to the via hole of the second part of the high frequency branch;

The first feed point and the second feed point are connected to each other.

The casing of the present invention is provided with an antenna line on its surface, and the antenna line is divided into a high-frequency branch and a low-frequency branch. The high-frequency branch and the low-frequency branch are distributed on the inner surface and the outer surface of the casing at the same time, so that the entire antenna structure does not occupy the interior At the same time, the limited area on the inner and outer surfaces of the housing is maximized, ensuring the communication performance of the antenna, and solving the problem of small design space for the current mobile terminal antenna. The antenna line of the present invention adopts the PIFA (Planar Inverted F-shaped Antenna, that is, planar inverted F antenna) antenna model, the high-frequency branch can cover the 1710-2170MHz communication frequency band, and the low-frequency branch can cover the 824-960MHz communication frequency band, and a good antenna is obtained. performance.

Preferably, the antenna line is a metal plating formed on the surface of the casing. The antenna line is formed on the surface of the casing by electroless plating, which has a strong bonding force with the casing, saves space, and is easy to decorate the outer surface of the casing.

Preferably, the housing is provided with a first microhole group and a second microhole group penetrating through the inner surface and the outer surface, and the first part of the high-frequency branch passes through the first microhole group and the second part of the high-frequency branch connected, the first part of the low-frequency branch is connected to the second part of the low-frequency branch through the second microhole group.

Preferably, the first microhole group and the second microhole group respectively include 4-6 microholes, and the diameter of each microhole is 0.08-0.1 mm.

Preferably, each microhole is filled with conductive metal pillars, and the first part of the high-frequency branch and the second part of the high-frequency branch, as well as the first part of the low-frequency branch and the second part of the low-frequency branch are respectively connected by conductive metal pillars.

The present invention uses a microhole group composed of a plurality of microholes to connect the antenna lines on the inner surface and the outer surface of the housing, so that the conductive metal columns formed after electroless plating can easily fill the microholes and realize good conductive connection; the microholes are filled with conductive It is easy to carry out surface decoration behind the metal post, and no other filler components are required. In addition, a plurality of microholes form a microhole group, which is equivalent to increasing the wire diameter of the conductive metal pillar, reducing the resistance of the conductive metal pillar, reducing energy loss, and improving antenna performance.

Preferably, the first part of the high-frequency branch includes a first radiation branch, a second radiation branch and a third radiation branch; the first radiation branch and the third radiation branch are arranged substantially in parallel, and the second radiation branch is connected to the Describe the first radiation branch and the third radiation branch. The first radiating branch, the second radiating branch and the third radiating branch enlarge the length of the first part of the high-frequency branch to maximize the use of the space on the inner surface of the casing, so that the high-frequency branch can meet the communication requirements of a specific frequency.

Preferably, the end of the first radiating branch away from the second radiating branch is provided with a first feeding point, and the end of the third radiating branch away from the second radiating branch is provided with a first microhole group.

Preferably, the first part of the low-frequency branch includes a fourth radiation branch, the fourth radiation branch is substantially parallel to the first radiation branch, and the fourth radiation branch and the third radiation branch are located at the same side and spaced from each other, the end of the fourth radiation branch close to the first feed point is the second feed point, and the other end is provided with the second microhole group. The low-frequency branch and the high-frequency branch of the present invention are reasonably arranged on the inner surface of the housing, maximizing the utilization of the space on the inner surface of the housing, and shortening the routing distance between the first feed point and the second feed point.

Preferably, the second part of the high-frequency branch includes a fifth radiation branch, the second part of the low-frequency branch includes a sixth radiation branch, and the fifth radiation branch and the sixth radiation branch are spaced apart on the outer surface of the insulating shell set up.

The present invention also provides an antenna device, which includes the above casing.

Preferably, the antenna device further includes a control board, and the first feed point and the second feed point of the antenna line are respectively connected to the control board.

Preferably, the control board includes: a circuit board, the circuit board has a ground plane, and one of the first feed point or the second feed point is connected to the ground plane; a radio frequency chip is arranged on the On the circuit board, one of the first feed point or the second feed point is connected to a radio frequency chip. One of the first feeding point and the second feeding point is used for grounding, and the other is used for feeding, so that the antenna circuit of the present invention constitutes a PIFA antenna and has good communication performance.

Description of drawings

Fig. 1 is a schematic diagram of the inner surface of the housing of the present invention;

Fig. 2 is a schematic diagram of the outer surface of the housing of the present invention;

Fig. 3 is a schematic diagram of the antenna circuit structure of the present invention;

Fig. 4 is a schematic diagram of the casing of the present invention.

detailed description

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in FIGS. 1-4 , the present invention provides a casing 10 , specifically a casing of a mobile terminal, and the casing 10 is made of an insulating material, such as plastic. The housing has an inner surface 11 and an outer surface 12, the outer surface 12 refers to a side facing the user, and the inner surface 11 is the side opposite to the outer surface. An antenna line 20 is formed on the casing, and the antenna line 20 includes a high-frequency branch 21 and a low-frequency branch 22. A part of the high-frequency branch is located on the inner surface 11 of the casing, and is the first part of the high-frequency branch. The other part of the high-frequency branch is located on the outer surface 12 of the housing, which is the second part of the high-frequency branch; the first part of the high-frequency branch and the second part of the high-frequency branch are connected through holes on the housing. A part of the low-frequency branch is located on the inner surface 11 of the housing, which is the first part of the low-frequency branch; another part of the low-frequency branch is located on the outer surface of the housing, which is the second part of the low-frequency branch; The first part of the branch and the second part of the low-frequency branch are connected through holes on the housing.

The antenna line of the present invention is a metal plating layer formed on the inner surface and the outer surface of the housing, that is, the high-frequency branch and the low-frequency branch are formed on the inner surface and the outer surface of the housing through an electroless plating process.

The antenna line 20 also includes a first feed point 210 and a second feed point 220, the first feed point 210 is located at one end of the first part of the high frequency branch; the second feed point is located at one end of the first part of the low frequency branch. That is to say, both the first feeding point 210 and the second feeding point 220 of the present invention are located on the inner surface 11 of the housing 10 , which is convenient for connecting with electrical components inside the mobile terminal, and does not require additional holes on the housing. The first feeding point 210 and the second feeding point 220 are connected to each other, and the antenna line 20 of the present invention constitutes a PIFA antenna, which can satisfy the normal communication function of the mobile terminal. Those skilled in the art can easily understand that the first feed point 210 on the first part of the high-frequency branch and the end connected to the via hole of the second part of the high-frequency branch are respectively located at both ends of the first part of the high-frequency branch, that is to say, the first feed point 210 is away from the end where the first part of the high frequency branch is connected to the via hole of the second part of the high frequency branch; similarly, the second feed point 220 on the first part of the low frequency branch and the end connected to the via hole of the second part of the low frequency branch are respectively located in the low frequency branch Both ends of the first part, that is to say, the second feeding point 220 are away from the end where the first part of the low-frequency branch is connected to the second part of the low-frequency branch via holes.

The casing 10 is provided with a first microhole group 215 and a second microhole group 223 penetrating through the inner surface and the outer surface, and the first microhole group and the second microhole group are both composed of a plurality of micropores. The first part of the high-frequency branch is connected to the second part of the high-frequency branch through the first microhole group 215 , and the first part of the low-frequency branch is connected to the second part of the low-frequency branch through the second microhole group 223 . Specifically, the first microhole group and the second microhole group respectively include 4-6 microholes, and the diameter of each microhole is 0.08-0.1 mm. According to an embodiment of the present invention, both the first microhole group and the second microhole group are composed of four microholes with a diameter of 0.1 mm. Each microhole is filled with a conductive metal post, and the first part of the high-frequency branch and the second part of the high-frequency branch, and the first part of the low-frequency branch and the second part of the low-frequency branch are respectively connected by a conductive metal post.

The present invention adopts the microhole group to connect the high-frequency branch and the low-frequency branch respectively located on the inner surface and the outer surface of the casing, and is suitable for directly forming conductive metal columns in the microholes by electroless plating, so that no additional filling components are needed, increasing The complexity of molding. Because each micropore is a through hole with a small diameter, it is convenient to decorate the outer surface. For example, the decoration effect on the outer surface is better after spraying paint, and there will be no traces that affect the appearance of the shell. Since the smaller the wire diameter of the conductive metal post is, the greater its resistance is, and the greater the energy loss for the antenna to send and receive signals, the present invention forms a microhole group by using 4-6 microholes with a diameter within the range of 0.08-0.1mm. The wire diameter is increased and the circuit of the conductive metal post is reduced, thereby reducing the energy loss to meet the antenna performance.

As shown in Figure 1 and Figure 3 in an embodiment of the present invention, the first part of the high-frequency branch is located on the inner surface 11 of the housing 10, including a first radiation branch 211, a second radiation branch 212 and a third radiation branch 213 : the first radiating branch 211 and the third radiating branch 213 are arranged substantially in parallel, and the second radiating branch 212 connects the first radiating branch 211 and the third radiating branch 213 . The present invention arranges the antenna lines in a folded form, maximizes the use of the space on the inner surface 11 of the housing 10, and avoids excessive lines extending to the outer surface 12 of the housing, which affects the appearance of the housing. The end of the first radiation branch 211 away from the second radiation branch 212 is provided with a first feeding point 210 , and the end of the third radiation branch 213 away from the second radiation branch 212 is provided with a first microhole group 215 . The length of the third radiating branch 213 is shorter than the length of the first radiating branch 211 , and the first feeding point 210 and the first microhole group 215 are arranged at intervals from each other.

The first part of the low-frequency branch is located on the inner surface 11 of the housing 10, and includes a fourth radiation branch 221, the fourth radiation branch 211 is substantially parallel to the first radiation branch 211 of the high-frequency branch, and the fourth radiation branch 221 and the third radiating branch 213 are located on the same side of the first radiating branch 211 and are spaced apart from each other. The end of the fourth radiating branch 221 close to the first feeding point 210 is provided with the second feeding point 220, and the other end is provided with the second feeding point 220. Two microhole groups 223. The low-frequency branch and high-frequency branch of the present invention are arranged reasonably on the inner surface of the housing, maximizing the use of the space on the inner surface of the housing. The trace spacing between feed points 220 .

As shown in FIGS. 2 and 3 , the second part of the high-frequency branch includes a fifth radiation branch 214, the second part of the low-frequency branch includes a sixth radiation branch 222, and the fifth radiation branch 214 and the sixth radiation branch 222 are arranged at intervals on the outer surface 12 of the housing 10 . The fifth radiating branch 214 and the third radiating branch 213 located on the inner surface are connected through the first microhole group 215, and the sixth radiating branch 222 and the fourth radiating branch 221 located on the inner surface pass through the second microhole group 223 connect.

Those skilled in the art know that the lower the communication frequency of the antenna, the longer the length of the antenna. In the present invention, the low frequency branch 22 of the antenna line needs to be longer than the high frequency branch 21 . The wiring length and arrangement form of the high-frequency branch 21 and the low-frequency branch 22 are specifically adjusted according to the impedance and standing wave of the actual antenna performance. That is, the relative positions and shapes of the high-frequency branch and the low-frequency branch on the inner and outer surfaces of the casing can also be adjusted appropriately according to the structure of the actual product, and the present invention has no special requirements.

The casing of the present invention is provided with an antenna line on its surface, and the antenna line is divided into a high-frequency branch and a low-frequency branch. The high-frequency branch and the low-frequency branch are distributed on the inner surface and the outer surface of the casing at the same time, so that the entire antenna structure does not occupy the interior The space maximizes the use of the limited area on the inner and outer surfaces of the casing, ensures the communication performance of the antenna, and solves the problem of difficult antenna design caused by the small design space of the current mobile terminal. The antenna circuit of the present invention adopts the PIFA antenna model, the high-frequency branch can cover the 1710-2170MHz communication frequency band, and the low-frequency branch can cover the 824-960MHz communication frequency band, thus obtaining good antenna performance.

The following describes the manufacturing method of the casing of the present invention and its surface antenna circuit. First, the casing 10 of the present invention can be formed by die casting. Hybrid electroless plating accelerator. Then the laser is used to selectively irradiate the area where the antenna line needs to be formed on the surface of the shell, and at the same time, the laser is used to process several microholes at the positions of the first and second microhole groups, and the diameter of each microhole is within a predetermined range. Under the irradiation of the laser, the plastic material on the surface of the shell and the surface of the micropores is vaporized, and then the electroless plating accelerator is exposed. Then put the whole shell in the electroless plating solution to form a metal coating at the exposed position of the electroless plating accelerator, and the metal coating is connected to form an antenna line, and the metal coating will not be formed at the position that has not been irradiated by the laser. The above metallization technology of the plastic surface is well known to those skilled in the art. Those skilled in the art can choose commonly used plastic materials and electroless plating accelerators, which are not specifically limited in the present invention.

The present invention also provides an antenna device including the above casing, and the antenna device further includes a control board (not shown in the figure), and the control board is connected to the first feed point 210 and the second feed point 220 . Specifically, the control board includes a circuit board and a radio frequency chip, the circuit board has a ground plane, and one of the first feed point and the second feed point is connected to the ground plane; the radio frequency chip is arranged on the circuit board , the other one of the first feed point 210 and the second feed point 220 is connected to a radio frequency chip. That is, one of the first feed point 210 and the second feed point 220 is grounded, and the other is used for power feeding. In this way, the entire antenna line 20 constitutes a PIFA antenna. In the antenna device of the present invention, the high-frequency branch can cover the 1710-2170MHz communication frequency band, and the low-frequency branch can cover the 824-960MHz communication frequency band, which has a good communication effect.

The present invention also provides a mobile terminal including the above-mentioned antenna device. The mobile terminal may be a smart phone or a wearable device, and the above-mentioned casing 10 is the casing of the mobile terminal. As shown in FIG. 4 , a coating 30 is provided on the outer surface of the housing of the mobile terminal. The coating 30 may be a commonly used paint in the field. The coating is used to cover the part of the antenna line 20 located on the outer surface of the housing. In the mobile terminal of the present invention, the antenna is arranged on the inner surface and the outer surface of the casing, so that the antenna does not occupy the internal space of the mobile terminal, and the mobile terminal can be thinned and miniaturized. At the same time, the antenna line will not affect the appearance of the casing.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the characteristics and principles of the present invention should be included in the protection of the present invention. within range.

Claims (13)

1. a kind of housing, it is characterised in that the housing is the shell of mobile terminal, is made up of insulating materials, including inner surface and outer surface；

Antenna traces are formed with the housing, the antenna traces include high-frequency branch and low frequency branch；The high-frequency branch includes high-frequency branch Part I and high-frequency branch Part II, the high-frequency branch Part I is located at the inner surface of the housing, the high-frequency branch Part II is located at the outer surface of the housing, the via connection on housing of the high-frequency branch Part I and high-frequency branch Part II；The low frequency branch includes low frequency branch Part I and low frequency branch Part II, the low frequency branch Part I is located at the inner surface of the housing, the low frequency branch Part II is located at the outer surface of the housing, the via connection on housing of the low frequency branch Part I and low frequency branch Part II；

The high-frequency branch Part I is provided with the first feed point away from the one end being connected with high-frequency branch Part II via；

The low frequency branch Part I is provided with the second feed point away from the one end being connected with low frequency branch Part II via；

First feed point and the second feed point are connected with each other.

2. housing according to claim 1, it is characterised in that the antenna traces are the coat of metal for being formed in surface of shell.

3. housing according to claim 1, it is characterized in that, the housing is provided with the first micropore group and the second micropore group through inner surface and outer surface, the high-frequency branch Part I is connected by the first micropore group with high-frequency branch Part II, and the low frequency branch Part I is connected by the second micropore group with low frequency branch Part II.

4. housing according to claim 3, it is characterised in that the first micropore group and the second micropore group include 4-6 bar micropores, every a diameter of 0.08-0.1mm of micropore respectively.

5. mobile terminal shell according to claim 4, it is characterized in that, it is filled with conducting metal post in every micropore, the high-frequency branch Part I and high-frequency branch second and low frequency branch Part I and low frequency branch Part II are connected by conducting metal post respectively.

6. housing according to claim 5, it is characterised in that the high-frequency branch Part I includes the first radiation branch, the second radiation branch and the 3rd radiation branch；First radiation branch and the 3rd substantially parallel setting of radiation branch, second radiation branch connect first radiation branch and the 3rd radiation branch.

7. housing according to claim 6, it is characterised in that first radiation branch is provided with the first feed point away from one end of the second radiation branch, and the 3rd radiation branch is provided with the first micropore group away from one end of the second radiation branch.

8. housing according to claim 7, it is characterized in that, the low frequency branch Part I includes the 4th radiation branch, the 4th radiation branch setting substantially parallel with the first radiation branch, 4th radiation branch and the 3rd radiation branch are respectively positioned on the same side of the first radiation branch and are intervally installed, 4th radiation branch is the second feed point near one end of the first feed point, and the other end is provided with the second micropore group.

9. housing according to claim 8, it is characterised in that the high-frequency branch Part II includes the 5th radiation branch, the low frequency branch Part II includes the 6th radiation branch, the outer surface interval setting of the 5th radiation branch and the 6th radiation branch in insulation shell.

10. a kind of antenna assembly, it is characterised in that including the housing described in any one in claim 1-9.

11. antenna assemblies according to claim 10, it is characterised in that also including control panel, first feed point and the second feed point of the antenna traces are connected with control panel respectively.

12. antenna assemblies according to claim 11, it is characterised in that the control panel includes：

Circuit board, the circuit board has ground plane, and one in first feed point or the second feed point is connected with ground plane；

Radio frequency chip, the radio frequency chip is located on the circuit board, and another in first feed point or the second feed point is connected with radio frequency chip.

13. a kind of mobile terminals, it is characterised in that including the antenna assembly described in any one in claim 10-12.