CN111370858A - Directional UHF Antennas and Electronics - Google Patents

Abstract

The present application provides a directional UHF antenna and electronic equipment. The directional UHF antenna includes: a dielectric substrate, including a first antenna radiation layer and a second antenna radiation layer disposed on two opposite surfaces. The first antenna body is attached to the first antenna radiation layer, and the first antenna body includes a first radiation arm and at least one first bending arm. The second antenna body is attached to the second antenna radiating layer and is symmetrically arranged with the first antenna body, wherein the second antenna body includes a second radiating arm and at least one second bending arm, and the second radiating arm is connected to the first radiating arm. The first radiating arm is symmetrically arranged and forms a first radiating unit, and the second bending arm is symmetrically arranged with the first folding arm and forms a second radiating unit. The feeding unit penetrates through the dielectric substrate and is electrically connected to the first antenna body and the second antenna body, and the feeding end of the feeding unit is arranged between the first radiating arm and the first bending arm. The first antenna body and the second antenna body form an omnidirectional antenna array to form a directional antenna.

Description

Directional UHF Antennas and Electronics

technical field

The present application belongs to the field of communication technologies, and relates to a directional UHF antenna and electronic equipment.

Background technique

In the related art, Ultra High Frequency (UHF) refers to radio waves with a frequency of 300 to 3000 MHz and a wavelength of 1 m to 1 dm. A miniaturized UHF antenna is used in the device, and the UHF antenna is usually integrated on the substrate to send and receive signals in the corresponding frequency band.

For example, a UHF antenna includes a dielectric plate structure, a coaxial feed connector, a first array arm and a second array arm, and the inner conductor of the coaxial feed connector passes through the dielectric plate structure and is welded to the starting end of the second array arm. Since the UHF antenna of this type of structure is an omnidirectional antenna, its gain is low and the transmission distance is short.

SUMMARY OF THE INVENTION

In view of this, the present application provides a directional UHF antenna and an electronic device.

Specifically, the application is achieved through the following technical solutions:

A first aspect provided by the present application discloses a directional UHF antenna, comprising:

a dielectric substrate, comprising a first antenna radiation layer and a second antenna radiation layer respectively disposed on two opposite surfaces;

a first antenna body, attached to the first antenna radiation layer, the first antenna body includes a first radiation arm and at least one first bending arm;

A second antenna body, attached to the second antenna radiating layer and symmetrically arranged with the first antenna body to form a log-periodic dipole antenna, wherein the second antenna body includes a second radiating arm and at least one first radiating arm Two bending arms, the second radiating arm is symmetrically arranged with the first radiating arm and forms a first radiating unit, and the second bending arm is symmetrically arranged with the first bending arm and forms a second radiating arm Radiation unit;

A feeding unit penetrates through the dielectric substrate and is electrically connected to the first antenna body and the second antenna body, and a feeding end of the feeding unit is arranged on the first radiating arm and the first fold between the arms.

In one embodiment, the ends of the first radiating arm and the first bending arm are at least partially bent

In one embodiment, the distal end of the first bending arm is bent in the direction of the first radiating arm, and the distal end of the first radiating arm is bent in a direction away from the first bending arm.

In one embodiment, the first radiating arm includes a first folded edge connected to the feeding unit and a second folded edge connected with the first folded edge, the second folded edge The edge is bent in a direction away from the first bending arm.

In one embodiment, the first radiating arm further includes a third bending edge connected to the second bending edge, and the second bending edge and the third bending edge are in a predetermined bending shape. angle, the third bent side extends toward the center of symmetry of the first antenna body and the second antenna body.

In one embodiment, the first bending arm includes a fourth bending edge connected to the feeding unit and a fifth bending edge connected with the fourth bending edge, the fourth bending The edge and the fifth bending edge are at a preset bending angle, and the fifth bending edge extends toward the first radiating arm.

In an embodiment, the distance between the first radiating arm and the first bending arm is D, and the working wavelength of the directional UHF antenna is set to λ _L , where D=λ _L /4.

In one embodiment, when there are two or more first bending arms, the distance between adjacent two first bending arms is the same and the bending direction is the same.

In an embodiment, two of the first bending arm and the second bending arm are provided to form two second radiation units, and the two second radiation units are spaced apart on the dielectric substrate .

In one embodiment, the feeding unit includes a conductor, a first feeding network connecting the first radiating arm and at least one first bending arm, and connecting the second radiating arm and at least one first radiating arm. The second feeding network of two bent arms, the conductor penetrates through the dielectric substrate and is connected to the first feeding network and the second feeding network.

In an embodiment, the feeding unit further includes a ground terminal connected to the first feeding network between the first radiating arm and the electrical conductor.

In a second aspect provided by the present application, an electronic device is disclosed, comprising a device body, a control module assembled in the device body, and the directional UHF antenna as described above, wherein the directional UHF antenna is electrically connected to the control module. connect.

The technical solutions provided by the embodiments of the present application may include the following beneficial effects:

The first antenna body and the second antenna body form a symmetrical log-periodic dipole antenna, and the omnidirectional antennas are arrayed to form a directional antenna. A first radiating element and at least one second radiating element are arranged in the directional UHF antenna, the gain of the antenna is high, and the transmission distance is long.

Description of drawings

FIG. 1 is a schematic structural diagram of a directional UHF antenna according to an exemplary embodiment of the present application.

FIG. 2 is a schematic diagram of a front structure of a directional UHF antenna according to an exemplary embodiment of the present application.

FIG. 3 is a schematic diagram of a rear structure of a directional UHF antenna according to an exemplary embodiment of the present application.

FIG. 4 is a schematic cross-sectional structural diagram of a directional UHF antenna according to an exemplary embodiment of the present application.

FIG. 5 is a schematic diagram of a return loss curve of a directional UHF antenna in a working state according to an exemplary embodiment of the present application.

FIG. 6 is a gain pattern of a directional UHF antenna according to an exemplary embodiment of the present application.

FIG. 7 is a graph showing the variation of the gain of the directional UHF antenna with frequency according to an exemplary embodiment of the present application.

In the figure, the dielectric substrate 10; the first antenna radiation layer 11; the second antenna radiation layer 12; the first antenna body 20; the first radiation arm 21; the first bending edge 211; the second bending edge 212; the third Bending edge 213; first bending arm 22; fourth bending edge 221; fifth bending edge 222; second antenna body 30; second radiating arm 31; second bending arm 32; feeding unit 40 ; the first feeding network 41 ; the second feeding network 42 ; the conductor 43 ;

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as recited in the appended claims.

The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this application and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It will also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited by these terms. These terms are only used to distinguish the same type of information from each other. For example, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information without departing from the scope of the present application. Depending on the context, the word "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determining."

As shown in FIG. 1 and FIG. 2 , the directional UHF antenna includes a dielectric substrate 10 , a first antenna body 20 , a second antenna body 30 and a feeding unit 40 , and the dielectric substrate 10 includes first antenna radiations respectively disposed on two opposite surfaces layer 11 and the second antenna radiation layer 12 . The first antenna body 20 is attached to the first antenna radiation layer 11 , and the first antenna body 20 includes a first radiation arm 21 and at least one first bending arm 22 .

The second antenna body 30 is attached to the second antenna radiating layer 12 and is symmetrically arranged with the first antenna body 20 to form a log-periodic dipole antenna, wherein the second antenna body 30 includes a second radiating arm 31 and at least one first radiating arm 31 . Two bending arms 32 . The second radiating arm 31 is symmetrically arranged with the first radiating arm 21 and forms a first radiation unit, and the second bending arm 32 is symmetrically arranged with the first bending arm 22 and forms a second radiation unit.

The feeding unit 40 penetrates through the dielectric substrate 10 and is electrically connected to the first antenna body 20 and the second antenna body 30 . The feeding end of the feeding unit 40 is disposed between the first radiating arm 21 and the first bending arm 22 .

The dielectric substrate 10 has a plate-like structure. The first antenna radiating layer 11 and the second antenna radiating layer 12 are provided on the dielectric substrate 10 and are parallel to or overlap with the surface of the dielectric substrate 10 . Optionally, the first antenna body 20 is overlapped with the first side surface of the dielectric substrate 10 , and the second antenna body 30 is overlapped with the second side surface of the dielectric substrate 10 .

The first antenna body 20 is provided on the first antenna radiation layer 11, the second antenna body 30 is provided on the second antenna radiation layer 12, the first antenna body 20 and the second antenna body 30 are separated by the dielectric substrate 10, and the second antenna body The projection of the main body 30 on the first antenna radiation layer 11 is arranged symmetrically with the first antenna main body 20 , so that the first antenna main body 20 and the second antenna main body 30 form a symmetrical log-periodic dipole antenna. Wherein, in the following expressions, the central axis of symmetry of the first antenna body 20 and the second antenna body 30 is defined as the axis of symmetry, the longitudinal direction of the axis of symmetry is defined as the lateral direction, and the direction perpendicular to the axis of symmetry is defined as the longitudinal direction.

The first antenna body 20 and the second antenna body 30 form a symmetrical log-periodic dipole antenna, and the omnidirectional antennas are arrayed to form a directional antenna. A first radiating element and at least one second radiating element are arranged in the directional UHF antenna, the gain of the antenna is high, and the transmission distance is long.

Optionally, the first radiating arm 21 and the first bending arm 22 are on the same side of the axis of symmetry. The first radiating arm 21 and the first bending arm 22 are distributed on the first antenna radiating layer 11 at intervals and extend outward from the feeding network. Optionally, the feeding unit 40 extends along the length of the axis of symmetry.

In one embodiment, the ends of the first radiating arm 21 and the first bending arm 22 are at least partially bent, and correspondingly, the ends of the second radiating arm 31 and the second bending arm 32 are also partially bent. The first antenna body 20 and the second antenna body 30 are laterally extended and spaced by a preset distance, and the ends are bent to reduce the longitudinal size, so that the assembly size of the directional UHF antenna can be easily adjusted. And by changing the bending direction of the first radiating arm 21 and the first bending arm 22, the antenna front-to-back ratio of the second radiating element and the first radiating element can be adjusted, the gain value of the antenna can be increased, and the transmission range of the signal can be expanded. In an optional embodiment, the coverage frequency band of the directional UHF antenna is 427MHz-460MHz.

As shown in FIG. 2 and FIG. 3 , in one embodiment, the end of the first bending arm 22 is bent toward the direction of the first radiating arm 21 , and the end of the first radiating arm 21 is away from the first bending arm 22 bend in the direction. The first bending arm 22 is located at the front end of the directional UHF antenna, and the first radiating arm 21 is located at the rear end of the directional UHF antenna. One end of the first bending arm 22 is connected to the feeding unit 40 , and the other end extends toward the first radiating arm 21 . One end of the first radiating arm 21 is connected to the feeding unit 40 , and the other end extends away from the first bending arm 22 . The ends of the first bending arm 22 and the first radiating arm 21 are bent to reduce the longitudinal width of the first antenna body 20 . The first radiating arm 21 and the second radiating arm 31 are symmetrically arranged, and correspondingly, the second radiating arm 31 is also provided with a corresponding bending structure.

In an optional embodiment, the first radiating arm 21 includes a first bent edge 211 connected to the feeding unit 40 and a second bent edge 212 connected with the first bent edge 211. The second bent edge The edge 212 is bent in a direction away from the first bending arm 22 . The first radiating arm 21 is set to an approximately "L"-shaped structure with a small longitudinal width. In an optional embodiment, the arm width of the first bending edge 211 is equal to the arm width of the second bending edge 212 . In a specific embodiment, the arm widths of the first bending side 211 and the second bending side 212 are set to 5-10 mm, and specifically, the arm widths can be set to 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, and the like.

In an optional embodiment, the first radiating arm 21 further includes a third bending edge 213 connected to the second bending edge 212, and the second bending edge 212 and the third bending edge 213 are in a predetermined bending shape Angle, the third bent side 213 extends toward the center of symmetry of the first antenna body 20 and the second antenna body 30 . The end of the second bending edge 212 is bent again to form a third bending edge 213 . The third bending edge 213 extends in the direction of the axis of symmetry, so that the first radiating arm 21 forms an approximately "U"-shaped structure. The first radiating arm 21 with the third bending edge 213 can reduce the longitudinal width of the first radiating element, and can also reduce the backward radiation generated by the first radiating element in the directional UHF antenna, and improve the directional UHF antenna. front-to-back ratio. In an optional embodiment, the second bent edge 212 is parallel to the axis of symmetry. Optionally, the arm width of the first radiation arm 21 is set to 6 mm.

In an optional embodiment, the first bending edge 211 is perpendicular to the second bending edge 212 , and the third bending edge 213 is perpendicular to the second bending edge 212 . The first bent side 211 is connected to the power feeding unit 40, and the power feeding unit 40 is set at the axis of symmetry. Optionally, the first bent edge 211 is perpendicular to the axis of symmetry. The third bending edge 213 is bent in the direction of the symmetry axis, which can reduce the length dimension of the directional UHF antenna in the lateral direction. In addition, the third bending edge 213 is bent in the direction of the symmetry axis, which can improve the front-to-back ratio of the antenna, so that the backward radiation or reception of the directional UHF antenna is smaller.

In an optional embodiment, the side length of the first bending side 211 is set to 50-60 mm, the side length of the second bending side 212 is set to 60-65 mm, and the side length of the third bending side 213 Set to 40 to 50 mm. In a specific embodiment, the side length of the first bending side 211 is set to 56 mm, the side length of the second bending side 212 is set to 63 mm, and the side length of the third bending side 213 is set to 45 mm. The first radiating arm 21 is set as a double-bending structure, and using the first radiating arm 21 of this structure can reduce the return loss of the antenna and increase the antenna gain.

In an optional embodiment, the first bending arm 22 includes a fourth bending edge 221 connected to the feeding unit 40 and a fifth bending edge 222 connected with the fourth bending edge 221. The fourth bending The edge 221 and the fifth bending edge 222 are at a predetermined bending angle, and the fifth bending edge 222 extends toward the direction of the first radiating arm 21 . The first bending arm 22 and the first radiating arm 21 are spaced apart, the fourth bending edge 221 extends outward in the longitudinal direction, and the fourth bending edge 221 is inclined at a preset angle to the axis of symmetry, such as the fourth bending edge 221 is perpendicular to the axis of symmetry or inclined relative to the axis of symmetry. The fifth bent edge 222 is bent from the end of the fourth bent edge 221 and extends in the direction of the first radiating arm 21, thereby reducing the longitudinal width of the antenna. In an optional embodiment, the length of the fourth bent edge 221 is equal to the length of the first bent edge 211 . In an optional embodiment, the fifth bent edge 222 is parallel to the axis of symmetry. The first bending arm 22 and the second bending arm 32 are symmetrically arranged. Correspondingly, the second bending arm 32 is also provided with the same bending structure as the first bending arm 22 .

In an optional embodiment, the length of the fourth bending side 221 is set to 50-60 mm, and the length of the fifth bending side 222 is set to 100-110 mm. In a specific embodiment, the length of the fourth bending side 221 is set to 56 mm, and the length of the fifth bending side 222 is set to 108 mm. In an optional embodiment, the fourth bent edge 221 is perpendicular to the fifth bent edge 222 . In an optional embodiment, the arm width of the fourth bending edge 221 is equal to the arm width of the fifth bending edge 222 . In a specific embodiment, the arm widths of the fourth bending edge 221 and the fifth bending edge 222 are set to 6 mm. The first bending arm 22 is set as an "L"-shaped structure, and is spaced from the first radiating arm 21 by a corresponding distance. The antenna has a large front-to-back ratio and a small longitudinal width.

In an embodiment, the distance between the first radiating arm 21 and the first bending arm 22 is D, and the working wavelength of the directional UHF antenna is set to λ _L , where D=λ _L /4. The distance between the first radiating arm 21 and the first bending arm 22 is correlated with the working wavelength of the antenna, so that the signal received or transmitted by the antenna is stable and the size of the antenna is kept small. For example, the working wavelength of the directional UHF antenna is set to 600 mm, and correspondingly, the distance between the first radiating arm 21 and the first bending arm 22 is set to 150 mm. Specifically, the first bending side 211 and the fourth bending side 221 are parallel to each other, and the distance between them is 150 mm. Among them, the operating wavelength is equal to the propagation speed of the signal in air divided by its operating frequency.

In an optional embodiment, when there are two or more first bending arms 22 , the distance between two adjacent first bending arms 22 is the same and the bending direction is the same.

There are two or more first bending arms 22, and two adjacent first bending arms 22 are spaced apart by a preset distance D1, optionally, D1 is equal to D. That is, the interval between two adjacent first bending arms 22 is equal to the interval between the first radiating arm 21 and the adjacent first bending arms 22 . When the separation distance between the first radiating arm 21 and the adjacent first bending arms 22 is 150 mm, the separation distance between the two adjacent first bending arms 22 is also set to 150 mm.

The multiple first bending arms 22 have the same structure and are arranged on the same side and extend laterally, and the gain of the antenna is easily adjusted. front-to-back ratio.

In a specific embodiment, two first bending arms 22 and two second bending arms 32 are provided to form two second radiation units, and the two second radiation units are distributed on the dielectric substrate 10 at intervals. The antenna is provided with two second radiating units, and the two second radiating units and the first radiating units are evenly distributed on the dielectric substrate 10 to form a directional nature, with strong performance of transmitting and receiving electromagnetic waves, and the antenna has small vertical and horizontal dimensions, The front-to-rear ratio of the antenna is large and the performance is good.

As shown in FIG. 4 , in one embodiment, the feeding unit 40 includes a conductor 43 , a first feeding network 41 connected to the first radiating arm 21 and at least one first bending arm 22 , and a first radiating network 41 connected to the second radiating arm For the arm 31 and the second feeding network 42 of the at least one second bending arm 32 , the conductor 43 penetrates through the dielectric substrate 10 and connects the first feeding network 41 and the second feeding network 42 .

The first feeding network 41 is disposed on the first antenna radiating layer 11 and extends along the axis of symmetry. The first radiating arm 21 and at least one first bending arm 22 are connected to the first feeding network 41 . The first radiating arm 21 is connected to the first feeding network 41 on one side of the conductor 43 , and the first bending arm 22 is connected to the first feeding network 41 on the other side of the conductor 43 .

Correspondingly, the second feeding network 42 and the first feeding network 41 are arranged symmetrically; or the projection of the second feeding network 42 on the first antenna radiation layer 11 coincides with the first feeding network 41 . The second radiating arm 31 is connected to the second feeding network 42 on one side of the conductor 43 , and the second bending arm 32 is connected to the second feeding network 42 on the other side of the conductor 43 . In an optional embodiment, the width of the first feeding network 41 is set to 3-4 mm. For example, the width of the first feeding network 41 is set to 3 mm, 3.2 mm, 3.4 mm, 3.5 mm, 4 mm, or the like.

The conductor 43 is made of a conductive material, for example, the conductor 43 is made of a metal material. The conductor 43 penetrates through the dielectric substrate 10 to electrically connect the first feeding network 41 and the second feeding network 42, and the signal can be transmitted between the conductor 43 and the first feeding network 41 and the second feeding network 42, and the signal Smooth delivery. The first feeding network 41 and the second feeding network 42 are connected by a conductor 43, wherein an insulating area is formed in the area of the first feeding network 41 surrounding the conductor 43, so that the conductor 43 can be connected to the feeder, and the feeder is connected convenient.

In an optional embodiment, the feeding unit 40 further includes a ground terminal 44 connected to the first feeding network 41 between the first radiating arm 21 and the conductor 43 . The ground wire is connected to the ground terminal 44 of the first feeding network 41, and the ground wire connection is convenient.

5 is a schematic diagram of the return loss curve of the directional UHF antenna provided with two second radiating elements of the present invention in a working state, wherein the working bandwidth of the antenna return loss below -10dB is 427MHz-453MHz. Figure 6 is the gain pattern of the directional UHF antenna, where the maximum gain of the antenna reaches 5.25dBi. Figure 7 is a graph of the gain of the directional UHF antenna varying with frequency. In the frequency band of 427MHz-460MHz, the gain of the antenna is greater than 5dBi.

The directional UHF antenna disclosed in the above embodiments is applied to an electronic device, so that the electronic device can transmit and receive signals of corresponding frequencies. In one embodiment, the electronic device includes a device body, a control module assembled in the device body, and the directional UHF antenna disclosed in the above embodiment, and the directional UHF antenna is electrically connected to the control module. The control module can receive the electrical signal transmitted by the directional UHF antenna, and send corresponding information to the outside through the directional UHF antenna. For example, the directional UHF antenna is used in base stations and other electronic equipment to transmit and receive signals. The directional UHF antenna has large gain, large transmission range, good directional effect, and good controllability of assembly size.

The above are only preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

Claims (12)

1. a directional UHF antenna, is characterized in that, comprises: a dielectric substrate (10), comprising a first antenna radiation layer (11) and a second antenna radiation layer (12) respectively disposed on two opposite surfaces; A first antenna body (20) attached to the first antenna radiation layer (11), the first antenna body (20) comprising a first radiation arm (21) and at least one first bending arm (22) ; A second antenna body (30) attached to the second antenna radiating layer (12) and arranged symmetrically with the first antenna body (20) to form a log-periodic dipole antenna, wherein the second antenna body ( 30) comprising a second radiating arm (31) and at least one second bending arm (32), the second radiating arm (31) and the first radiating arm (21) being symmetrically arranged and forming a first a radiation unit, wherein the second bending arm (32) is symmetrically arranged with the first bending arm (22) to form a second radiation unit; A feeding unit (40) penetrates through the dielectric substrate (10) and is electrically connected to the first antenna body (20) and the second antenna body (30). The electrical terminal is arranged between the first radiating arm (21) and the first bending arm (22). 2 . The directional UHF antenna according to claim 1 , wherein the ends of the first radiating arm ( 21 ) and the first bending arm ( 22 ) are at least partially bent. 3 . 3. The directional UHF antenna according to claim 2, wherein the end of the first bending arm (22) is bent in the direction of the first radiating arm (21), and the first radiating The end of the arm (21) is bent in a direction away from the first bending arm (22). 4. The directional UHF antenna according to claim 3, wherein the first radiating arm (21) comprises a first bent edge (211) connected to the feeding unit (40) and a first folded edge (211) connected to the A second bending edge (212) connected to the first bending edge (211), the second bending edge (212) is bent in a direction away from the first bending arm (22). 5. The directional UHF antenna according to claim 4, wherein the first radiating arm (21) further comprises a third bending edge (213) connected to the second bending edge (212), The second bending edge (212) and the third bending edge (213) are at a preset bending angle, and the third bending edge (213) faces the first antenna body (20) and the The second antenna body (30) extends in the direction of the center of symmetry. 6. The directional UHF antenna according to claim 3, wherein the first bending arm (22) comprises a fourth bending edge (221) connected to the feeding unit (40) and a fourth bending edge (221) connected to the feeding unit (40). A fifth bending edge (222) connected to the fourth bending edge (221), the fourth bending edge (221) and the fifth bending edge (222) are at a preset bending angle, and the The fifth bending edge (222) extends toward the direction of the first radiating arm (21). 7. The directional UHF antenna according to claim 1, wherein the distance between the first radiating arm (21) and the first bending arm (22) is D, and the working wavelength of the directional UHF antenna is set to is λ _L , where D=λ _L /4. 8. The directional UHF antenna according to claim 1, characterized in that, when two or more first bending arms (22) are provided, two adjacent first bending arms (22) are the same distance apart and bend in the same direction. 9 . The directional UHF antenna according to claim 1 , wherein two of the first bending arms ( 22 ) and the second bending arms ( 32 ) are provided to form two second radiations. 10 . unit, two of the second radiation units are distributed on the dielectric substrate (10) at intervals. 10. The directional UHF antenna according to claim 1, wherein the feeding unit (40) comprises a conductor (43), a first radiating arm (21) connected to the first, and at least one first bending a first feeding network (41) of the arm (22), a second feeding network (42) connecting the second radiating arm (31) and at least one second bending arm (32), the electrical conductor (43) Passing through the dielectric substrate (10) and connecting the first feeding network (41) and the second feeding network (42). 11. The directional UHF antenna according to claim 10, characterized in that, the feeding unit (40) further comprises a radiating arm (21) connected between the first radiating arm (21) and the conductor (43) The ground terminal (44) of the first feeding network (41). 12. An electronic device, characterized by comprising a device body, a control module assembled in the device body, and the directional UHF antenna according to any one of claims 1 to 11, the directional UHF antenna being the same as the said directional UHF antenna. The control module is electrically connected.

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