Image transmission antenna of unmanned aerial vehicle

Abstract

The invention discloses an image transmission antenna of an unmanned aerial vehicle. The image transmission antenna comprises a substrate; a front radiation unit which is installed on the front surface of the substrate and is used for receiving and transmitting a first frequency band signal and / or a second frequency band signal; and a back radiation unit which is installed on the back surface of the substrate and is used for receiving and transmitting a third frequency band signal and reflecting the first frequency band signal and / or the second frequency band signal. A traditional PCB antenna single-face wiring design is adjusted into a front face and back face double-face wiring layout, the bandwidth and performance of different frequency bands of the antenna can be improved, meanwhile, radiation of the front face radiation unit is reflected through the three-dimensional back face radiation unit structure, the signal gain facing the unmanned aerial vehicle direction is increased, and the antenna performance is improved. Therefore, the directionality of the antenna is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of communication equipment, and particularly relates to a picture transmission antenna of a unmanned aerial vehicle. BACKGROUND

[0002] The picture transmission antenna of the unmanned aerial vehicle is mainly used for transmitting video signals captured by a camera of the unmanned aerial vehicle to a ground receiving device; in the prior art, the picture transmission antenna of the unmanned aerial vehicle is mostly an omnidirectional antenna, for example, the patent with the patent name of "picture transmission antenna suitable for unmanned aerial vehicle, unmanned aerial vehicle foot stand and unmanned aerial vehicle" and the publication number of CN219371375U discloses an omnidirectional antenna, which adopts a design of radiating elements on the same surface of a substrate, has the characteristics of multiple frequency bands and miniaturization; however, in the actual use of the unmanned aerial vehicle, since the ground section only needs to communicate with the unmanned aerial vehicle in a directional manner, a large part of the omnidirectional antenna is wasted, and when the unmanned aerial vehicle performs over-the-horizon flight, the low gain of the omnidirectional antenna leads to difficulty in long-distance transmission.

[0003] In order to solve the problem of performance waste of the omnidirectional antenna, the patent with the patent name of "angle adjusting device for picture transmission antenna of unmanned aerial vehicle" and the publication number of CN222029322U discloses an angle adjusting device for the picture transmission antenna of the unmanned aerial vehicle, which adjusts the angle of the picture transmission antenna through a gear structure, so as to realize the position adjustment of the unmanned aerial vehicle and high-quality signal receiving work. However, since the angle adjusting device is a mechanical structure, the antenna can only rotate along a vertical plane, and the angle adjustment is very limited, and in the process of rotation, the radiation direction of the antenna still surrounds the circular ring range with the antenna body as the axis, and the pitch adjustment and directional communication cannot be realized.

[0004] In order to further improve the directional communication ability of the antenna, the patent with the patent name of "communication method, terminal device and antenna assembly" and the publication number of CN120017088A discloses a communication method of multiple antenna beamforming of the unmanned aerial vehicle remote controller end through omnidirectional and directional antenna intelligent switching and beam optimization, so that the synthesized beam of the antenna array is always directed to the unmanned aerial vehicle, thereby improving the communication quality between devices or reducing the cost of the device; however, the implementation of the scheme needs to set complex software algorithms, radio frequency devices and feed networks, so that the design difficulty, cost and production yield of the antenna are high. SUMMARY

[0005] In view of the technical problems in the prior art, the application provides a picture transmission antenna of a unmanned aerial vehicle, which adjusts the single-sided wiring design of the traditional PCB antenna to a double-sided wiring layout of the front surface and the back surface, so as to not only improve the bandwidth and performance of the antenna at different frequency bands, but also reflect the radiation of the front surface radiation element by using the three-dimensional back surface radiation element structure, so as to increase the signal gain in the direction of the unmanned aerial vehicle, thereby improving the directivity of the antenna.

[0006] To solve the above technical problems, the present application provides the following technical solutions:

[0007] A picture transmission antenna of a UAV, comprising: a substrate; a front radiation unit installed on the front of the substrate for receiving and transmitting first frequency band signals and / or second frequency band signals; and a back radiation unit installed on the back of the substrate for receiving and transmitting third frequency band signals and reflecting the first frequency band signals and / or the second frequency band signals.

[0008] Compared with the prior art, the present application has the following beneficial effects:

[0009] The antenna structure in the present application is simple and low in cost, and does not need to set software algorithms and complex feeding networks. The traditional PCB antenna single-sided wiring design is adjusted to a front and back double-sided wiring layout, which not only increases the area of each frequency band antenna by utilizing the space of the double-sided layout, improves the bandwidth and performance of the antenna at different frequency bands, but also reflects the radiation of the front radiation unit by utilizing the three-dimensional back radiation unit structure, so as to realize directional transmission of the antenna signal without changing the structure size and increasing the cost, and increase the signal gain facing the direction of the UAV, thereby improving the directivity of the antenna, and further improving the transmission distance and signal transmission stability of the UAV data link, and improving the communication ability between the UAV control end (such as a remote controller) and the UAV. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is the overall structure diagram of the picture transmission antenna in the present application in a first view angle;

[0011] Figure 2 is the overall structure diagram of the picture transmission antenna in the present application in a second view angle;

[0012] Figure 3 is the front structure diagram of the picture transmission antenna in the present application;

[0013] Figure 4 is the back structure diagram of the picture transmission antenna in the present application;

[0014] Figure 5 is the top view of the back of the picture transmission antenna in the present application;

[0015] Figure 6 is the return loss diagram of the picture transmission antenna in the present application;

[0016] Figure 7 is the XY plane pattern diagram of the picture transmission antenna in the present application at a 1.42 GHz frequency band;

[0017] Figure 8 is the XY plane pattern diagram of the picture transmission antenna in the present application at a 2.44 GHz frequency band;

[0018] Figure 9 XY plane pattern of the image transmission antenna in the application at 5.34 GHz frequency band. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the application will be apparently and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all the other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the application.

[0020] Embodiment 1

[0021] The embodiment provides an image transmission antenna of a UAV, as shown in the figure, which comprises: Figures 1-2

[0022] a substrate 1, in the embodiment, the substrate 1 can adopt a PCB substrate, which can be made of FR4 material, and the dielectric constant is between 3-6;

[0023] a front radiation unit 2 installed on the front of the substrate 1, used for receiving and transmitting first frequency band signals and / or second frequency band signals;

[0024] a back radiation unit 3 installed on the back of the substrate 1, used for receiving and transmitting third frequency band signals, and reflecting the first frequency band signals and / or the second frequency band signals; in the embodiment, the range of the first frequency band, the range of the second frequency band and the range of the third frequency band are 2.4-2.5 GHz, 5.15-5.85 GHz and 1.42-1.45 GHz respectively;

[0025] and a feeding unit 4 in contact with the front radiation unit 2 or the back radiation unit 3, used for providing energy to the front radiation unit 2 or the back radiation unit 3 to excite the front radiation unit 2 and the back radiation unit 3 to generate electromagnetic radiation at the same time.

[0026] In the embodiment, the front radiation unit 2 and the back radiation unit 3 can be made of metal material, such as copper, and the front radiation unit 2 and the back radiation unit 3 are connected through conductive medium; for example, in the embodiment, a through hole can be first opened in the thickness direction of the substrate 1, and then the conductive medium is passed through the through hole to electrically connect the front radiation unit 2 and the back radiation unit 3 on the front and back of the substrate 1 at the same time.

[0027] Further, as shown in the figure, Figure 3 ​As shown, the length direction of the substrate 1 is defined as the X direction, and the width direction is defined as the Y direction. On this basis, the front radiation unit 2 includes a first front radiation subunit 21 and a second front radiation subunit 22, which are both mounted on the front of the substrate 1 and are symmetrical about the Y direction symmetry axis.

[0028] Specifically, the first front radiation subunit 21 includes:

[0029] a first front Y direction radiation unit 211, which is a strip structure extending along the Y direction as a whole;

[0030] a first front branch radiation unit 212, which is a strip structure, and one end of which is connected to the first front Y direction radiation unit 211, and the other end is a free end;

[0031] and a second front branch radiation unit 213, one end of which is connected to the first front Y direction radiation unit 211, and the other end is a free end.

[0032] The first front branch radiation unit 212 is used for transmitting and receiving first frequency band signals (i.e., signals in the range of 2.4-2.5 GHz), and the second front branch radiation unit 213 is used for transmitting and receiving second frequency band signals (i.e., signals in the range of 5.15-5.85 GHz).

[0033] Specifically, the first front branch radiation unit 212 in the embodiment has two groups, which are symmetrically arranged about the X direction symmetry axis, and each first front branch radiation unit 212 is arranged obliquely relative to the first front Y direction radiation unit 211, and the acute angle α formed by each first front branch radiation unit 212 and the first front Y direction radiation unit 211 is 30°-75°.

[0034] Meanwhile, the second front branch radiation unit 213 also has two groups, which are also symmetrically arranged about the X direction symmetry axis, and there is a first gap 214 between the first front branch radiation unit 212 and the second front branch radiation unit 213 located on the same side of the X direction symmetry axis.

[0035] Similarly, the second front radiation subunit 22 includes:

[0036] a second front Y direction radiation unit 221, which is a strip structure extending along the Y direction as a whole, and is parallel to the first front Y direction radiation unit 211;

[0037] a third front branch radiation unit 222, which is a strip structure, and one end of which is connected to the second front Y direction radiation unit 221, and the other end is a free end;

[0038] and a fourth front branch radiation unit 223, one end of which is connected to the second front Y-direction radiation unit 221, and the other end is a free end;

[0039] The third front branch radiation unit 222 is used for transmitting and receiving a first frequency band signal (i.e. a signal in the range of 2.4-2.5 GHz), and the fourth front branch radiation unit 223 is used for transmitting and receiving a second frequency band signal (i.e. a signal in the range of 5.15-5.85 GHz).

[0040] The third front branch radiation unit 222 in the embodiment has two groups, and is symmetrically arranged about the X-direction symmetry axis, and each third front branch radiation unit 222 is arranged obliquely relative to the second front Y-direction radiation unit 221, and the acute angle α' formed by each third front branch radiation unit 222 and the second front Y-direction radiation unit 221 is 30-75°.

[0041] Meanwhile, the first front branch radiation unit 212 and the third front branch radiation unit 222 are symmetrically arranged about the Y-direction symmetry axis.

[0042] Further, the fourth front branch radiation unit 223 also has two groups, and is also symmetrically arranged about the X-direction symmetry axis, and the third front branch radiation unit 222 and the fourth front branch radiation unit 223 located on the same side of the X-direction symmetry axis have a second gap 224 therebetween.

[0043] Meanwhile, the second front branch radiation unit 213 and the fourth front branch radiation unit 223 are symmetrically arranged about the Y-direction symmetry axis.

[0044] The first gap 214 and the second gap 224 can be used as tuning elements, and the capacitance at the feed point is adjusted by adjusting the width of the gap. For example, when the width of the first gap 214 decreases, the feed point capacitance at the first front branch radiation unit 212 and the second front branch radiation unit 213 increases, and vice versa. When the width of the first gap 214 increases, the feed point capacitance at the first front branch radiation unit 212 and the second front branch radiation unit 213 decreases. Similarly, changes in the width of the second gap 224 also cause similar changes in the feed point capacitance.

[0045] Further, since the input impedance Z_in of the antenna is R+jX, where R is the input resistance of the antenna, and jX is the input reactance of the antenna, and the feed point capacitance can be used as a component of the input reactance, thereby affecting the input impedance Z_in. Therefore, in the embodiment, the impedance matching of the antenna can be quickly realized by adjusting the width of the first gap 214 and the second gap 224.

[0046] Further, each of the second front branch radiation unit 213 and the fourth front branch radiation unit 223 in the embodiment is a sheet structure in regular geometric shape, such as a triangular sheet structure, and the extending directions of the free ends of the second front branch radiation unit 213 and the fourth front branch radiation unit 223 located on the same side of the X-symmetrical axis are opposite.

[0047] As shown in Figure 4 the back radiation unit 3 includes a first back radiation sub-unit and a second back radiation sub-unit, which are mounted on the back of the substrate 1 and are symmetrical structures about the Y-symmetrical axis, and the first back radiation sub-unit and the second back radiation sub-unit are used for transceiving signals in the third frequency band (i.e. signals in the range of 1.42-1.45 GHz), and can reflect signals in the first frequency band and / or signals in the second frequency band.

[0048] Specifically, the first back radiation sub-unit includes a first back X-direction radiation unit 311, a second back X-direction radiation unit 312, a third back X-direction radiation unit 313, a fourth back X-direction radiation unit 314, a first connecting radiation unit 315, a second connecting radiation unit 316, and a third connecting radiation unit 317.

[0049] Among them, the first back X-direction radiation unit 311, the second back X-direction radiation unit 312, the third back X-direction radiation unit 313, and the fourth back X-direction radiation unit 314 are all strip structures and all extend along the X-direction and are parallel to each other.

[0050] Further, the first connecting radiation unit 315 connects the first back X-direction radiation unit 311 and the second back X-direction radiation unit 312 respectively, the second connecting radiation unit 316 connects the third back X-direction radiation unit 313 and the fourth back X-direction radiation unit 314 respectively, and the third connecting radiation unit 317 connects the second back X-direction radiation unit 312 and the third back X-direction radiation unit 313 respectively.

[0051] At the same time, there are gaps between the first back X-direction radiation unit 311 and the second back X-direction radiation unit 312, between the third back X-direction radiation unit 313 and the fourth back X-direction radiation unit 314, and between the second back X-direction radiation unit 312 and the third back X-direction radiation unit 313.

[0052] The second back radiation sub-unit includes a fifth back X-direction radiation unit 321, a sixth back X-direction radiation unit 322, a seventh back Y-direction radiation unit 323, an eighth back X-direction radiation unit 324, a fourth connecting radiation unit 325, a fifth connecting radiation unit 326, and a sixth connecting radiation unit 327.

[0053] The fifth back surface X-direction radiation unit 321, the sixth back surface X-direction radiation unit 322, the seventh back surface Y-direction radiation unit 323 and the eighth back surface X-direction radiation unit 324 are all strip structures and extend along the X-direction and are parallel to each other.

[0054] Further, the fourth connecting radiation unit 325 is connected to the fifth back surface X-direction radiation unit 321 and the sixth back surface X-direction radiation unit 322 respectively, the fifth connecting radiation unit 326 is connected to the seventh back surface Y-direction radiation unit 323 and the eighth back surface X-direction radiation unit 324 respectively, and the sixth connecting radiation unit 327 is connected to the sixth back surface X-direction radiation unit 322 and the seventh back surface Y-direction radiation unit 323 respectively.

[0055] Meanwhile, there is a gap between the fifth back surface X-direction radiation unit 321 and the sixth back surface X-direction radiation unit 322, between the seventh back surface Y-direction radiation unit 323 and the eighth back surface X-direction radiation unit 324, and between the sixth back surface X-direction radiation unit 322 and the seventh back surface Y-direction radiation unit 323.

[0056] Preferably, when the back surface area of the substrate 1 is limited, one or more of the first back surface X-direction radiation unit 311, the second back surface X-direction radiation unit 312, the third back surface X-direction radiation unit 313, the fourth back surface X-direction radiation unit 314, the fifth back surface X-direction radiation unit 321, the sixth back surface X-direction radiation unit 322, the seventh back surface Y-direction radiation unit 323 and the eighth back surface X-direction radiation unit 324 are connected perpendicularly to the back surface of the substrate 1 to form a three-dimensional signal transmitting and reflecting structure, while saving installation space.

[0057] Thus, the antenna structure in the embodiment is simple and low in cost. The traditional single-sided trace design of the PCB antenna is adjusted to a double-sided trace design on the front surface and the back surface. The area of each frequency band antenna can be increased by using the space of the double-sided layout to improve the bandwidth and performance of the antenna at different frequency bands. Meanwhile, the radiation of the front surface radiation unit is reflected by the three-dimensional back surface radiation unit structure to realize directional transmission and reception of the antenna signal without changing the structure size and increasing the cost, while increasing the signal gain in the direction of the unmanned aerial vehicle to improve the transmission distance and signal transmission stability of the unmanned aerial vehicle data link.

[0058] Embodiment 2:

[0059] The difference between the embodiment and the embodiment 1 is that, as shown in FIG. 2, the first back surface X-direction radiation unit 311, the second back surface X-direction radiation unit 312, the third back surface X-direction radiation unit 313 and the fourth back surface X-direction radiation unit 314 are connected to the back surface of the substrate 1 respectively. Figure 3As shown, the free end of each first frontal branch radiation unit 212 is bent to form a bent structure 2121 extending in the X direction, and the free end of each third frontal branch radiation unit 222 is bent to form a bent structure 2221 extending in the X direction; thereby preventing the free ends from extending beyond the edge of the substrate 1, and confining the first frontal branch radiation unit 212 and the third frontal branch radiation unit 222 within the surface area of ​​the substrate 1.

[0060] Example 3:

[0061] The only difference between this embodiment and embodiment 1 or 2 is that, Figure 5 As shown, the projection of a first front-side branch radiation unit 212 on the back side of the substrate 1 is located between the first back-side X-axis radiation unit 311 and the second back-side X-axis radiation unit 312, and / or, the projection of a first front-side branch radiation unit 212 on the back side of the substrate 1 is located between the third back-side X-axis radiation unit 313 and the fourth back-side X-axis radiation unit 314.

[0062] The projection of a third front-side branch radiation unit 222 on the back side of the substrate 1 is located between the fifth back-side X-direction radiation unit 321 and the sixth back-side X-direction radiation unit 322, and / or the projection of a third front-side branch radiation unit 222 on the back side of the substrate 1 is located between the seventh back-side Y-direction radiation unit 323 and the eighth back-side X-direction radiation unit 324.

[0063] like Figure 5 As shown, since the first back-side X-direction radiating unit 311 and the second back-side X-direction radiating unit 312 are parallel structures extending along the X-direction and both are perpendicular to the back side of the substrate 1, a three-dimensional signal reflection space can be formed between the first back-side X-direction radiating unit 311 and the second back-side X-direction radiating unit 312. Meanwhile, the first front-side branch radiating unit 212 does not extend along the X-direction; its projection on the back side of the substrate 1 is tilted relative to the first back-side X-direction radiating unit 311 and the second back-side X-direction radiating unit 312. Therefore, when the first front-side branch radiating unit 212 emits a signal, the signal can be transmitted within the signal reflection space between the first back-side X-direction radiating unit 311 and the second back-side X-direction radiating unit 312 (e.g., along the X-direction). Figure 5 The signal is transmitted in the direction of the arrow in the image and reflected by the first back X-axis radiation unit 311 and the second back X-axis radiation unit 312, thereby increasing the gain of the first frequency band signal.

[0064] Similarly, the signal emitted by the third frontal branch radiation unit 222 can also be enhanced by reflection through the fifth back X-axis radiation unit 321 and the sixth back X-axis radiation unit 322, thereby increasing the gain of the second frequency band signal.

[0065] To verify the transmission and reception performance of the antenna signal in this invention, the image transmission antenna in this invention was tested. Figure 6 It can be seen that the resonant points of the image transmission antenna of the UAV are 1.42-1.54GHz, 2.4-2.5GHz and 5.15-5.85GHz, which are all commonly used frequency bands for UAV image transmission.

[0066] like Figure 7 As shown, when the image transmission antenna is placed vertically, the XY plane radiation pattern at 1.42Hz is very uniform, and the gain is 1.8dBi on both the front and back sides of the antenna; Figure 8 As shown in the XY plane radiation pattern at 2.44 GHz, the maximum gain at the front of the image transmission antenna is 0.5 dBi higher than the gain at the back of the antenna; Figure 9 As shown in the XY plane radiation pattern at 5.34 GHz, the maximum gain ratio of the front of the image transmission antenna is 3.4 dBi higher than that of the back of the antenna.

[0067] In summary, the antenna structure of this invention is simple and low-cost. It does not require software algorithms or complex feeding networks. By adjusting the traditional single-sided PCB antenna design to a double-sided design with front and back traces, it not only increases the area of ​​each frequency band antenna by utilizing the space of the double-sided layout, thereby improving the bandwidth and performance of the antenna in different frequency bands, but also uses a three-dimensional back-side radiating unit structure to reflect the radiation from the front-side radiating unit. This enables directional transmission and reception of antenna signals without changing the structural size or increasing costs, while also increasing the signal gain towards the UAV. For example, the antenna gain of the image transmission antenna in the 2.4GHz and 5.8GHz frequency bands can be improved by using the back-side radiating unit, thereby improving the antenna's directivity and ultimately increasing the transmission distance and signal transmission stability of the UAV data link.

[0068] It should be noted that the technical features in embodiments 1 to 3 above can be combined arbitrarily, and the resulting technical solutions all fall within the protection scope of this application. Furthermore, in this document, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0069] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. An image transmission antenna for a drone, characterized in that, include: substrate; A front-facing radiating unit, which is mounted on the front side of the substrate, is used to transmit and receive signals in the first frequency band and / or the second frequency band. Additionally, a back-side radiating unit is mounted on the back side of the substrate for transmitting and receiving third-band signals and reflecting first-band and / or second-band signals.

2. The image transmission antenna as described in claim 1, characterized in that, The front radiating unit includes a first front radiating subunit and a second front radiating subunit, both of which are mounted on the front side of the substrate and have a structure that is symmetrical about the Y-axis.

3. The image transmission antenna as described in claim 2, characterized in that, The first front-facing radiating subunit includes: The first frontal Y-direction radiating unit is a strip-shaped structure extending along the Y direction. The first frontal branch radiating unit is a strip structure, and one end is connected to the first frontal Y-direction radiating unit for transmitting and receiving signals in the first frequency band. In addition, a second frontal branch radiating unit, one end of which is connected to the first frontal Y-axis radiating unit, is used to transmit and receive signals in the second frequency band.

4. The image transmission antenna as described in claim 3, characterized in that, There are two sets of the first frontal branch radiation units, which are symmetrically arranged about the X-axis, and each first frontal branch radiation unit is inclined relative to the first frontal Y-axis radiation unit. Furthermore, there are two sets of the second frontal branch radiation units, which are symmetrically arranged about the X-axis, and there is a first gap between the first frontal branch radiation units and the second frontal branch radiation units located on the same side of the X-axis.

5. The image transmission antenna as described in claim 2, characterized in that, The second front-facing radiating unit includes: The second frontal Y-direction radiating unit is a strip-shaped structure extending along the Y direction. The third frontal branch radiating unit is a strip structure, and one end of it is connected to the second frontal Y-axis radiating unit for transmitting and receiving signals in the first frequency band. In addition, a fourth frontal branch radiating unit, one end of which is connected to the second frontal Y-axis radiating unit, is used to transmit and receive signals in the second frequency band.

6. The image transmission antenna as described in claim 5, characterized in that, There are two sets of third frontal branch radiation units, which are symmetrically arranged about the X-axis, and each third frontal branch radiation unit is inclined relative to the second frontal Y-axis radiation unit. Furthermore, there are two sets of the fourth frontal branch radiation unit, which are symmetrically arranged about the X-axis, and there is a second gap between the third and fourth frontal branch radiation units located on the same side of the X-axis.

7. The image transmission antenna as described in claim 5, characterized in that, The back-side radiating unit includes a first back-side radiating subunit and a second back-side radiating subunit, both of which are mounted on the back side of the substrate and have a structure that is symmetrical about the Y-axis. Both the first back-side radiating subunit and the second back-side radiating subunit are used to transmit and receive signals in the third frequency band and can reflect signals in the first frequency band and / or the second frequency band.

8. The image transmission antenna as described in claim 7, characterized in that, The first back-side radiation subunit includes: a first back-side X-axis radiation unit, a second back-side X-axis radiation unit, a third back-side X-axis radiation unit, a fourth back-side X-axis radiation unit, a first connecting radiation unit, a second connecting radiation unit, and a third connecting radiation unit; Among them, the first back X-direction radiating element, the second back X-direction radiating element, the third back X-direction radiating element, and the fourth back X-direction radiating element all extend along the X direction. The first connecting radiation unit is connected to the first back X-axis radiation unit and the second back X-axis radiation unit respectively; the second connecting radiation unit is connected to the third back X-axis radiation unit and the fourth back X-axis radiation unit respectively; and the third connecting radiation unit is connected to the second back X-axis radiation unit and the third back X-axis radiation unit respectively.

9. The image transmission antenna as described in claim 8, characterized in that, The second back-side radiation subunit includes: a fifth back-side X-axis radiation unit, a sixth back-side X-axis radiation unit, a seventh back-side Y-axis radiation unit, an eighth back-side X-axis radiation unit, a fourth connecting radiation unit, a fifth connecting radiation unit, and a sixth connecting radiation unit; Among them, the fifth back X-direction radiating element, the sixth back X-direction radiating element, the seventh back Y-direction radiating element, and the eighth back X-direction radiating element all extend along the X direction; The fourth connecting radiation unit is connected to the fifth back X-axis radiation unit and the sixth back X-axis radiation unit, the fifth connecting radiation unit is connected to the seventh back Y-axis radiation unit and the eighth back X-axis radiation unit, and the sixth connecting radiation unit is connected to the sixth back X-axis radiation unit and the seventh back Y-axis radiation unit.

10. The image transmission antenna as described in claim 9, characterized in that, One or more of the following: the first back X-axis radiating unit, the second back X-axis radiating unit, the third back X-axis radiating unit, the fourth back X-axis radiating unit, the fifth back X-axis radiating unit, the sixth back X-axis radiating unit, the seventh back Y-axis radiating unit, and the eighth back X-axis radiating unit are all vertically connected to the back of the substrate.

11. The image transmission antenna as described in claim 10, characterized in that, The projection of a first front-side branch radiating unit on the back side of the substrate is located between the first back-side X-axis radiating unit and the second back-side X-axis radiating unit, and / or the projection of a first front-side branch radiating unit on the back side of the substrate is located between the third back-side X-axis radiating unit and the fourth back-side X-axis radiating unit. In addition, the projection of a third front stub radiating element on the back side of the substrate is located between the fifth back X-axis radiating element and the sixth back X-axis radiating element, and / or the projection of a third front stub radiating element on the back side of the substrate is located between the seventh back Y-axis radiating element and the eighth back X-axis radiating element.

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