Image transmission antenna, unmanned aerial vehicle equipment and manufacturing method of image transmission antenna

Abstract

The invention provides an image transmission antenna, an unmanned aerial vehicle and a manufacturing method of the image transmission antenna. The image transmission antenna comprises a feeder line used for being connected with antenna equipment and an oscillator frame, the oscillator frame comprises a frame body, a first wiring layer and a second wiring layer, and the feeder line is sleeved with the frame body; the first wiring layer comprises a first circumferential wiring section and a first axial wiring section, the first circumferential wiring section is arranged in the circumferential direction of the outer circumferential wall of the rack body, the first axial wiring section is arranged in the axial direction of the outer circumferential wall of the rack body, and one end of the first axial wiring section is connected to the first circumferential wiring section to form a first wiring bending area; the second wiring layer comprises a second circumferential wiring section and a second axial wiring section, the second circumferential wiring section is arranged in the circumferential direction of the outer circumferential wall of the rack body, the second axial wiring section is arranged in the axial direction of the outer circumferential wall of the rack body, and one end of the second axial wiring section is connected to the second circumferential wiring section to form a second wiring bending area; the first wiring bending area and the second wiring bending area are oppositely arranged.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to an image transmission antenna, a drone, and a method for manufacturing the image transmission antenna. Background Technology

[0002] After taking pictures, the drone connects to the image transmission communication device via an image transmission antenna to transmit various image data. The main operating frequency band of existing image transmission antennas is 5.8 GHz.

[0003] However, in the 5.8GHz operating frequency band, the signal diffraction and penetration capabilities of the image transmission antenna are relatively weak. Due to the complex and varied shooting environment of drones, for example, when drones shoot in urban and densely populated areas, they are blocked by various buildings, which causes the drone's signal to attenuate. This makes the data connection and interaction between the drone and the image transmission antenna prone to interruption, resulting in low reliability of image data transmission from the image transmission antenna. Summary of the Invention

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide an image transmission antenna, a drone, and a method for manufacturing the image transmission antenna with high reliability for image data transmission.

[0005] The purpose of this disclosure is achieved through the following technical solution: An image transmission antenna includes a feed line, a first end of which is used to connect to an antenna device. The image transmission antenna further includes: The vibrator frame includes a frame body, a first wiring layer and a second wiring layer, wherein the frame body is sleeved on the feeder; The first wiring layer includes a first circumferential wiring segment and a first axial wiring segment. The first circumferential wiring segment is arranged circumferentially along the outer peripheral wall of the frame, and the first axial wiring segment is arranged axially along the outer peripheral wall of the frame. One end of the first axial wiring segment is connected to the first circumferential wiring segment to form a first wiring bending area. One of the first circumferential wiring segment and the first axial wiring segment is electrically connected to the inner conductor of the second end of the feed line. The second wiring layer includes a second circumferential wiring segment and a second axial wiring segment. The second circumferential wiring segment is arranged circumferentially along the outer peripheral wall of the frame, and the second axial wiring segment is arranged axially along the outer peripheral wall of the frame. One end of the second axial wiring segment is connected to the second circumferential wiring segment to form a second wiring bending area. One of the second circumferential wiring segment and the second axial wiring segment is electrically connected to the outer conductor of the second end of the feed line. The first routing bend area and the second routing bend area are positioned opposite each other.

[0006] In one embodiment, the first circumferential routing segment and the second circumferential routing segment are axially spaced along the outer wall of the frame.

[0007] In one embodiment, the first circumferential routing segment includes a first routing line and a second routing line, the first routing line and the second routing line are axially spaced along the outer peripheral wall of the frame, and both the first routing line and the second routing line are connected to the first axial routing segment; the first routing line includes a plurality of sequentially connected first broken lines, and the second routing line includes a plurality of sequentially connected second broken lines.

[0008] In one embodiment, the second circumferential routing segment includes a third routing line and a fourth routing line, the third routing line and the fourth routing line are axially spaced along the outer peripheral wall of the frame, and both the third routing line and the fourth routing line are connected to the second axial routing segment; the third routing line includes a plurality of sequentially connected third broken lines, and the fourth routing line includes a plurality of sequentially connected fourth broken lines.

[0009] In one embodiment, there are multiple vibrator frames, which are arranged at intervals from top to bottom along the axial direction of the feed line.

[0010] In one embodiment, the feed line includes an inner conductor and an outer conductor arranged sequentially from the inside to the outside. The second end of the inner conductor is electrically connected to the first wiring layer of the topmost dipole frame, and the second end of the outer conductor is electrically connected to the second wiring layer of the topmost dipole frame. The outer conductor is also electrically connected to the first and second wiring layers of the remaining dipole frames, respectively. The first ends of the inner conductor and the outer conductor are both used for electrical connection to the antenna equipment.

[0011] In one embodiment, the top of the vibrator frame is provided with a plurality of upper clearance slots, each of the upper clearance slots being spaced apart around the top of the vibrator frame, and an upper wiring adjacent wall being formed between each of the upper clearance slots; and / or, The bottom of the vibrator frame is provided with a plurality of lower avoidance grooves, each of the lower avoidance grooves being spaced around the bottom of the vibrator frame, and a lower wiring adjacent wall is formed between each of the lower avoidance grooves, and the second wiring layer is formed on the outer wall of the lower wiring adjacent wall.

[0012] In one embodiment, a plurality of upper connecting lines are formed on the top of the oscillator frame. The starting point of each upper connecting line is located at the opening of each upper recess and connected to the first wiring layer. The ending point of each upper connecting line converges at the top of the oscillator frame and is electrically connected to the second end of the inner conductor. A plurality of lower connecting lines are formed on the bottom of the oscillator frame. The starting point of each lower connecting line is located at the opening of each lower recess and connected to the second wiring layer. The ending point of each lower connecting line converges at the bottom of the oscillator frame and is electrically connected to the second end of the outer conductor.

[0013] A drone device includes an image transmission antenna according to any of the above embodiments.

[0014] A method for manufacturing an image transmission antenna, used to manufacture the image transmission antenna of any of the above embodiments.

[0015] Compared with the prior art, this disclosure has at least the following advantages: The aforementioned image transmission antenna connects to the antenna equipment via the first end of the feed line, allowing the antenna equipment to input varying voltages and currents into the feed line from the first end. The second end of the feed line then feeds the radio frequency signal into the vibrator frame, thereby exciting the first and second wiring layers to generate an electric field. The varying voltage and current generate a varying electric field, which in turn generates a varying magnetic field, forming electromagnetic waves. These electromagnetic waves are then radiated into space through the electromagnetic wave image transmission antenna.

[0016] Since the length of the first circumferential line segment is the same as that of the second circumferential line segment, but their directions are opposite, a first horizontal electric field and a second horizontal electric field of the same magnitude but opposite directions are generated in the radial direction of the oscillator frame. Both the first and second horizontal electric fields are vectors, following the law of vector superposition, and the superposition occurs at the far-field observation point. Therefore, the first and second horizontal electric fields are superimposed to form a composite horizontal electric field, which is E. 水平total Simultaneously, the first axial routing segment generates a first vertical electric field, and the second axial routing segment generates a second vertical electric field. Both the first and second vertical electric fields are vectors, following the law of vector superposition, and this superposition occurs at the far-field observation point. The first and second vertical electric fields are superimposed to form a composite vertical electric field, which is E. 垂直total .

[0017] Furthermore, the length of the first circumferential routing segment is greater than the length of the first axial routing segment, and the length of the second circumferential routing segment is greater than the length of the second axial routing segment, thus making ϕE 垂直total -ϕE 水平total =90°, the synthesized horizontal electric field and the synthesized vertical electric field are spatially orthogonal and rotate with a phase difference of 90°, that is, the synthesized horizontal electric field and the synthesized vertical electric field form an omnidirectional circularly polarized electromagnetic wave in the XY plane, thereby enabling the image transmission antenna to radiate circularly polarized waves in space to suppress multipath reflection, so that the image transmission antenna can prevent signal degradation and fading, and thus ensure that the image transmission link between the UAV and the image transmission antenna can work stably to transmit image signals to the antenna equipment.

[0018] The image transmission antenna disclosed herein has a simple structure and can achieve resonance without connecting the image transmission antenna to an external feeding network, and radiates circularly polarized waves into space, thus reducing the complexity of the image transmission antenna equipment. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a transmission antenna according to an embodiment of the present disclosure; Figure 2 for Figure 1 An exploded view of the structure of an image transmission antenna according to one embodiment; Figure 3a for Figure 1 A schematic diagram of the oscillator frame in one embodiment; Figure 3b for Figure 1 A schematic diagram of the oscillator frame in one embodiment; Figure 4 for Figure 1 A return loss curve of a video transmission antenna according to one embodiment. Figure 5 for Figure 1 A VSWR curve of a video transmission antenna according to one embodiment; Figure 6 for Figure 1 A graph showing the axial ratio of an image transmission antenna according to one embodiment; Figure 7 for Figure 1 A simulated 3D circularly polarized radiation pattern of a video transmission antenna according to one embodiment; Figure 8 for Figure 1 Enlarged view of point A in the middle; Figure 9 This is an exploded structural diagram of a video transmission antenna according to another embodiment; Figure 10 for Figure 9 A return loss curve of the image transmission antenna in another embodiment. Figure 11 for Figure 9 A VSWR curve of the image transmission antenna of another embodiment. Figure 12 for Figure 9 Axis ratio curve of the image transmission antenna of another embodiment.

[0021] Reference numerals: Image transmission antenna 10; Housing 100; Bottom cover 110; Through hole 111; Feeder 200; Inner conductor 210; Outer conductor 220; Vibrator frame 300; frame body 310; upper clearance groove 311; upper wiring adjacent wall 312; lower clearance groove 313; lower wiring adjacent wall 314; second connecting hole 315 First routing layer 320; First circumferential routing segment 321; First routing 3211; First bend line 32111; Second routing 3212; Second bend line 32121; First axial routing segment 322; First routing bending area 323; Second routing layer 330; Second circumferential routing segment 331; Third routing 3311; Third zigzag line 33111; Fourth routing 3312; Fourth zigzag line 33121; Second axial routing segment 332; Second routing bend area 333; Upper connector 340; Lower connector 350; Radiation unit 400; cover 410; first connecting hole 411; sealing cover 420; third connecting hole 421; Connecting rod 500. Detailed Implementation

[0022] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments: Please see Figures 1 to 7This disclosure provides an image transmission antenna 10, including a feed line 200. A first end of the feed line 200 is used to connect to an antenna device. The image transmission antenna also includes a vibrator frame 300. The vibrator frame includes a frame body 310, a first wiring layer 320, and a second wiring layer 330. The frame body is fitted onto the feed line. The first wiring layer 320 includes a first circumferential wiring segment 321 and a first axial wiring segment. The first circumferential wiring segment 321 is arranged circumferentially along the outer peripheral wall of the frame body 310, and the first axial wiring segment 322 is arranged axially along the outer peripheral wall of the frame body 310. One end of the first axial wiring segment 322 is connected to the first circumferential wiring segment 321 to form a first wiring bend 323. One of the first circumferential wiring segment 321 and the first axial wiring segment 322 is electrically connected to the feed line 200. The inner conductors at both ends; the second wiring layer 330 includes a second circumferential wiring segment 331 and a second axial wiring segment 332. The second circumferential wiring segment 331 is arranged circumferentially along the outer peripheral wall of the frame 310, and the second axial wiring segment 332 is arranged axially along the outer peripheral wall of the frame 310. One end of the second axial wiring segment 332 is connected to the second circumferential wiring segment 331 to form a second wiring bending area 333; one of the second circumferential wiring segment 331 and the second axial wiring segment 332 is electrically connected to the outer conductor at the second end of the feed line 200; the first wiring bending area 323 and the second wiring bending area 333 are arranged opposite to each other.

[0026] Furthermore, the routing length of the first circumferential routing segment 321 is greater than that of the first axial routing segment 322, the routing length of the second circumferential routing segment 331 is greater than that of the second axial routing segment 332, and the routing length of the first circumferential routing segment 321 is the same as that of the second circumferential routing segment 331.

[0027] The first circumferential routing segment 321 is used to generate a first horizontal electric field, and the second circumferential routing segment 331 is used to generate a second horizontal electric field. The first horizontal electric field and the second horizontal electric field are superimposed to form a composite horizontal electric field. The first axial routing segment 322 is used to generate a first vertical electric field, and the second axial routing segment 332 is used to generate a second vertical electric field. The first vertical electric field and the second vertical electric field are superimposed to form a composite vertical electric field. The composite horizontal electric field and the composite vertical electric field have a 90° phase difference, forming spatial orthogonality and rotation to radiate circularly polarized waves.

[0028] The aforementioned image transmission antenna is connected to an antenna device via the first end of the feed line 200, so that the antenna device inputs changing voltage and current into the feed line 200 from the first end of the feed line 200, and then feeds radio frequency signals into the vibrator frame 300 from the second end of the feed line 200, thereby exciting the first wiring layer 320 and the second wiring layer 330 to generate an electric field. Due to the changing voltage and current, a changing electric field is generated, and then a changing magnetic field is generated from the changing electric field to form an electromagnetic wave, which is then radiated into space through the electromagnetic wave image transmission antenna.

[0029] Since the length of the first circumferential line segment is the same as that of the second circumferential line segment, but their directions are opposite, a first horizontal electric field and a second horizontal electric field of the same magnitude but opposite directions are generated in the radial direction of the oscillator frame. Both the first and second horizontal electric fields are vectors, following the law of vector superposition, and the superposition occurs at the far-field observation point. Therefore, the first and second horizontal electric fields are superimposed to form a composite horizontal electric field, which is E. 水平total Simultaneously, the first axial trace segment 322 generates a first vertical electric field, and the second axial trace segment 332 generates a second vertical electric field. Both the first and second vertical electric fields are vectors, following the vector superposition rule, and the superposition occurs at the far-field observation point. The first and second vertical electric fields are superimposed to form a composite vertical electric field, which is E. 垂直total .

[0030] Furthermore, the length of the first circumferential routing segment 321 is greater than the length of the first axial routing segment 322, and the length of the second circumferential routing segment 331 is greater than the length of the second axial routing segment 332, thus making ϕE 垂直total -ϕE 水平total =90°, the synthesized horizontal electric field and the synthesized vertical electric field are spatially orthogonal and rotate with a phase difference of 90°. That is, the synthesized horizontal electric field and the synthesized vertical electric field form an omnidirectional circularly polarized electromagnetic wave in the XY plane. This allows the image transmission antenna to radiate circularly polarized waves into space, suppressing multipath reflections and preventing signal attenuation. This ensures that the image transmission link between the UAV and the image transmission antenna can work stably to transmit image signals to the antenna equipment. See also Figure 4 At 5.0-7.0 GHz, the return loss is below -10 dB. (See [reference needed]) Figure 5 At 5.0-7.0 GHz, the VSWR is less than 2, resulting in good impedance matching for the image transmission antenna. (See also...) Figure 6 In the 5.0-7.0 GHz frequency band, the axial ratio of the image transmission antenna disclosed herein is less than 3 dB. See also... Figure 7 In this example, Figure 7 The simulation results show the circularly polarized 3D radiation pattern of the image transmission antenna at a frequency of 6 GHz. Figure 7The image transmission antenna shown in this disclosure is a horizontally omnidirectional circularly polarized antenna.

[0031] Thus, by setting the first circumferential trace 321 in the horizontal direction, vertical linear polarization can be generated. In the vertical direction, the first axial trace 322 generates horizontal linear polarization, forming a 90-degree phase difference in the XY plane. Therefore, a horizontal omnidirectional circularly polarized radiation characteristic is formed. The image transmission antenna structure disclosed in this invention is simple, and resonance can be achieved without connecting the image transmission antenna to an external feed network, radiating circularly polarized waves into space, thus reducing the complexity of the image transmission antenna equipment.

[0032] Understandably, the image transmission antenna needs to generate circularly polarized waves to strengthen the link between the drone and the antenna. However, to ensure the purity of the circularly polarized waves, the image transmission antenna needs to be restricted to operating within a narrower frequency range, resulting in reduced bandwidth.

[0033] Furthermore, in one embodiment, the first circumferential routing segment 321 and the second circumferential routing segment 331 are axially spaced along the outer wall of the frame 310.

[0034] In this embodiment, the first circumferential routing segment 321 and the second circumferential routing segment 331 are spaced apart around the outer wall of the frame 310, thereby extending the routing length of the first circumferential routing segment 321 and the second circumferential routing segment 331 to introduce more resonant points and expand the bandwidth. At the same time, the first axial routing segment 322 and the second axial routing segment 332 are electrically connected to the first end of the feed line 200. Through the feed line 200, the electromagnetic waves generated by the vibrator frame 300 can be better radiated outward from the space of the housing 100, thereby enabling the image transmission antenna to achieve frequency tuning, maximizing the gain of the image transmission antenna, reducing the circular polarization wave axis ratio, and achieving maximum radiation efficiency.

[0035] It should be noted that the synthesized horizontal electric field and the synthesized vertical electric field are spatially orthogonal and rotate with a 90° phase difference to form a circularly polarized wave, which leads to a reduction in the bandwidth of the image transmission antenna. Therefore, after the first trace layer 320 and the second trace layer 330 are excited, the first circumferential trace segment 321 and the second circumferential trace segment 331 are spaced apart along the axial direction of the outer wall of the frame 310, allowing them to couple to improve impedance matching and maintain a stable VSWR. At the same time, to prevent strong coupling between the first circumferential trace segment 321 and the second circumferential trace segment 331, which could cause a decrease in the axial ratio of the image transmission antenna, it is necessary to space them apart. Meanwhile, to prevent the gap between the first circumferential routing segment 321 and the second circumferential routing segment 331 from being too large, which would increase the size of the vibrator frame 300 and thus increase the size of the image transmission antenna, in this embodiment, the distance between the first circumferential routing segment 321 and the second circumferential routing segment 331 along the axial direction of the outer wall of the frame 310 is 0.79mm.

[0036] Understandably, existing image transmission antennas mainly adopt plate antenna structures, clover structures, and four-leaf clover structures. Among them, the plate antenna structure is manufactured using PCB (printed circuit board) technology, which increases the size of the plate antenna structure.

[0037] Therefore, in one embodiment, the first circumferential routing segment 321 includes a first routing line 3211 and a second routing line 3212, which are axially spaced along the outer peripheral wall of the frame 310. Both the first routing line 3211 and the second routing line 3212 are connected to the first axial routing line segment 322. The first routing line 3211 includes a plurality of sequentially connected first broken lines 32111, and the second routing line 3212 includes a plurality of sequentially connected second broken lines 32121.

[0038] Among them, multiple first broken lines 32111 are connected and combined in sequence to form a serpentine line segment of the first routing line 3211; multiple second broken lines 32121 are connected and combined in sequence to form a serpentine line segment of the second routing line 3212.

[0039] It should be noted that in this embodiment, the first trace 3211 is formed into a serpentine trace segment by multiple first fold lines 32111, which further increases the path through which the current flows, thereby increasing the total length of the path through which the current fed into the first circumferential trace segment 321 by the feed line 200 increases. Similarly, the second trace 3212 is formed into a serpentine trace segment by multiple second fold lines 32121, which further increases the overall resonant point of the first circumferential trace segment 321. Thus, there is no need to expand the volume structure of the vibrator frame 300 to increase the resonant point, thereby reducing the overall structure of the image transmission antenna.

[0040] In one embodiment, the second circumferential routing segment 331 includes a third routing line 3311 and a fourth routing line 3212. The third routing line 3311 and the fourth routing line 3312 are axially spaced along the outer peripheral wall of the frame 310. Both the third routing line 3311 and the fourth routing line 3312 are connected to the second axial routing segment 332. The third routing line 3311 includes a plurality of sequentially connected third broken lines 33111, and the fourth routing line 3312 includes a plurality of sequentially connected fourth broken lines 33121.

[0041] Among them, multiple third broken lines 33111 are connected and combined in sequence to form a serpentine line segment of the third line 3311; multiple fourth broken lines 33121 are connected and combined in sequence to form a serpentine line segment of the fourth line 3312.

[0042] It should be noted that in this embodiment, the third trace 3311 is formed into a serpentine trace segment by multiple third fold lines 33111, which further increases the path through which the current flows, thereby increasing the total length of the path through which the current fed into the second circumferential trace segment 331 by the feed line 200 increases. Similarly, the fourth trace 3312 is formed into a serpentine trace segment by multiple fourth fold lines 33121, which further increases the overall resonant point of the second circumferential trace segment 331, thus eliminating the need to expand the volume structure of the vibrator frame 300 to increase the resonant point, thereby reducing the overall structure of the image transmission antenna.

[0043] Thus, the image transmission antenna disclosed herein enables the first circumferential routing segment 321 and the second circumferential routing segment 331 to achieve double-peak resonance, thereby improving the operating bandwidth of the image transmission antenna, enhancing the radiation efficiency and polarization characteristics of the image transmission antenna, and further reducing the circular polarization axial ratio.

[0044] Understandably, existing image transmission antennas typically employ clover or tetraclover structures to radiate circularly polarized waves in order to suppress multipath effects, thereby avoiding the multipath effect generated by the signal radiated by the image transmission antenna. However, clover or tetraclover structures are assembled from multiple antenna modules, making the installation process of image transmission antennas rather cumbersome.

[0045] Therefore, in one embodiment, there are multiple vibrator frames 300, which are arranged sequentially from top to bottom along the axial direction of the feed line 200. Each vibrator frame 300 is sleeved on the second end of the feed line 200.

[0046] It should be noted that multiple vibrator frames 300 are arranged sequentially from top to bottom along the axial direction of the feed line 200 to form a vertical coaxial array, thereby improving the gain of the image transmission antenna, increasing the communication distance of the image transmission antenna, and improving the signal strength of the image transmission antenna. This enables the UAV to reduce signal distortion in flight environments with many obstructions, thereby suppressing multipath effects. In this embodiment, the number of vibrator frames 300 is multiple, that is, two or more vibrator frames.

[0047] In another embodiment, the spacing between each of the said vibrator frames 300 is... ~ .

[0048] It should be noted that when the interval between each 300 oscillator frame is less than When the spacing between each of the oscillator frames 300 is greater than a certain value, strong coupling occurs, causing crosstalk in the electric field formed by each oscillator frame 300. This leads to a decrease in the polarization purity of the oscillator frame 300, which in turn reduces the purity of the circularly polarized wave formed by the combined horizontal and vertical electric fields. This results in an increase in the size of the image transmission antenna, which is detrimental to the miniaturization design of the image transmission antenna. Therefore, in this embodiment, the spacing between each of the aforementioned vibrator frames 300 is... .

[0049] Specifically, The wavelength of the electromagnetic wave; in this embodiment, the operating frequency of the image transmission antenna is... It is 5.8 GHz, according to the wavelength formula It can be seen that, With operating frequency Inversely proportional, among which Let be the speed of electromagnetic wave propagation in a vacuum, which is 3 × 10⁻⁶. 8 m / s is a constant, that is... With operating frequency Inversely proportional. In this embodiment, and Substituting into the wavelength formula, we can obtain... 0.59cm 3.62cm. In this embodiment, the spacing between each of the aforementioned vibrator frames 300 is... ,Right now 3.12cm.

[0050] See Figure 1 and Figure 9In one embodiment, the feed line 200 includes an inner conductor 210 and an outer conductor 220 arranged sequentially from the inside to the outside. The second end of the inner conductor 210 is electrically connected to the first wiring layer 320 of the topmost dipole frame 300, and the second end of the outer conductor 220 is electrically connected to the second wiring layer 330 of the topmost dipole frame 300. The outer conductor 220 is also electrically connected to the first wiring layer 320 and the second wiring layer 330 of the other dipole frames 300 respectively. The first end of the inner conductor 210 and the first end of the outer conductor 220 are both used for electrical connection to antenna equipment.

[0051] It should be noted that the antenna device feeds a changing voltage and current into the inner conductor 210 through the first end of the inner conductor 210. The changing voltage and current excite the first wiring layer 320 of the topmost vibrator frame 300 through the second end of the inner conductor 210, thereby making the first wiring layer 320 of the topmost vibrator frame 300 an active excitation point. At the same time, the outer conductor 220 is electrically connected to the second wiring layer 330 of the topmost vibrator frame 300 to form a passive grounding point, and the outer conductor 220 is grounded and coupled to the first wiring layer 320 and the second wiring layer 330 of the other vibrator frames 300 to form grounding points. This forms a closed loop between the excitation point and the grounding point, thereby enabling the image transmission antenna to have a wide bandwidth, thus achieving good radiation efficiency while maintaining miniaturization.

[0052] See Figure 3a In one embodiment, the top of the frame 310 is provided with a plurality of upper clearance slots 311, each of the upper clearance slots 311 being spaced around the top of the frame 310, and an upper wiring adjacent wall 312 being formed between each of the upper clearance slots 311; the first wiring layer 320 is formed on the outer wall of the upper wiring adjacent wall 312; and / or, The bottom of the frame 310 is provided with a plurality of lower avoidance grooves 313, each of the lower avoidance grooves 313 being spaced around the bottom of the frame 310, and a lower wiring adjacent wall 314 is formed between each of the lower avoidance grooves 313, and the second wiring layer 330 is formed on the outer wall of the lower wiring adjacent wall 314.

[0053] It should be noted that in this embodiment, both the first wiring layer 320 and the second wiring layer 330 adopt LDS (Laser Direct Structuring) technology. Specifically, a through-slot is formed along the axial direction inside the vibrator frame 300. The vibrator frame 300 is fitted onto the first end of the feed line 200 through the through-slot. The first end of the inner conductor 210 passes through the through-slot and is directly electrically connected to the first wiring layer 320 through the upper clearance slot 311. In this example, the first end of the inner conductor 210 is directly bonded to the first wiring layer 320 by ultrasonic welding to reduce the loss of radio frequency signals. The second end of the inner conductor 210 is used to connect to the antenna equipment, which can conduct the changing current and voltage fed by the antenna equipment to the first wiring layer 320. Ultrasonic welding is a prior art technology in this example and will not be described in detail here. Similarly, the first end of the outer conductor 220 is directly bonded to the second wiring layer 330 by ultrasonic welding through the lower wall slot, thereby reducing the loss of radio frequency signals.

[0054] See Figure 3a In another embodiment, the top of the oscillator frame 300 is formed with a plurality of upper connecting lines 340. The starting point of each upper connecting line 340 is located at the opening of each upper recess 311 and connected to the first wiring layer 320. The ending point of each upper connecting line 340 converges at the top of the oscillator frame 300 and is electrically connected to the second end of the inner conductor 210. The bottom of the oscillator frame 300 is formed with a plurality of lower connecting lines 350. The starting point of each lower connecting line 350 is located at the opening of each lower recess 313 and connected to the second wiring layer 330. The ending point of each lower connecting line 350 converges at the bottom of the oscillator frame 300 and is electrically connected to the second end of the outer conductor 220.

[0055] In this embodiment, both the upper connecting line 340 and the lower connecting line 350 employ LDS (Laser Direct Structuring) technology. It should be noted that in this embodiment, the endpoint of the upper connecting line 340 of the topmost oscillator frame 300 is also electrically connected to the first end of the inner conductor 210. This reduces the number of times the inner conductor 210 feeds multiple first wiring layers 320, transforming it from multi-point feeding to single-point feeding. This reduces the number of connection lines between the inner conductor 210 and the first wiring layers 320, simplifying the electrical connection assembly between the inner conductor 210 and the first wiring layers 320. Similarly, the second end of the outer conductor 220 is electrically connected to the lower connecting line 350 of the topmost oscillator frame 300, further reducing the number of connection lines between the outer conductor 220 and the second wiring layer 330, simplifying the electrical connection assembly between the outer conductor 220 and the second wiring layer 330.

[0056] In another embodiment, the first end of the outer conductor 220 is also electrically connected to the upper and lower wiring layers of the remaining oscillator frame 300, respectively.

[0057] In this embodiment, the first end of the outer conductor 220 is electrically connected to the lower connecting line 350 of the topmost oscillator frame 300, and the second end of the outer conductor 220 reduces the electrical connection with the first wiring layer 320 and the second wiring layer 330 of the remaining oscillator frames 300, making assembly simpler.

[0058] See Figure 10 In another embodiment, the image transmission antenna 10 further includes a plurality of radiating elements 400 and a feed line 200. The plurality of radiating elements 400 are sequentially spaced along the axial direction of the feed line 200 and are passed through the first end of the feed line 200. Each of the connecting rods 500 is disposed between every two radiating elements 400. Each radiating unit 400 includes a cover 410, a sealing cover 420, and a vibrator frame 300. The top of the cover 410 has a first connecting hole 411, the vibrator frame 300 has a second connecting hole 315, and the sealing cover 420 has a third connecting hole 421. The first connecting hole 411, the second connecting hole 315, and the third connecting hole 421 are arranged opposite each other, so that the second end of the feed line 200 can pass through the first connecting hole 411, the second connecting hole 315, and the third connecting hole 421 in sequence. The vibrator frame 300 is disposed inside the cover 410, and the sealing cover 420 is disposed at the bottom of the cover 410. The sealing cover 420 is used to seal the cover 410.

[0059] It should be noted that each radiating element 400 is isolated from the bottom cover 110 by the cover 410 to form an independent electromagnetic wave radiating element 400. This minimizes the mutual coupling interference of each vibrator frame 300, maximizing the purity of the circularly polarized wave. Furthermore, the failure of a single radiating element 400 does not affect the overall function, enhancing the fault tolerance of the image transmission antenna. Simultaneously, the number of radiating elements 400 can be adjusted according to the UAV's flight environment to regulate the antenna's gain.

[0060] See Figure 2 In one embodiment, the image transmission antenna further includes a housing 100 and a bottom cover 110. The bottom cover 110 covers the bottom of the housing 100 and has a through hole 111 for passing the first end of the feed line 200 through and extending into the housing 100. This makes the housing 100 a sealed unit, preventing the dipole frame 300 from detaching from the housing 100 and protecting the dipole frame 300. Simultaneously, it allows the electric field of the dipole frame 300 to be more concentrated, preventing a decrease in the purity of the circularly polarized wave.

[0061] This disclosure also provides a drone device, including the image transmission antenna of any of the above embodiments.

[0062] This disclosure also provides a method for manufacturing an image transmission antenna, used to manufacture the image transmission antenna of any of the above embodiments. Further, the manufacturing method includes some or all of the following steps: S100, An upper clearance groove 311 is opened on the top of the vibrator frame 300; It should be noted that in this embodiment, an upper clearance groove 311 is provided on the top of the vibrator frame 300 so that the feed line 200 can be easily connected to the first wiring layer 320. At the same time, the top of the vibrator frame 300 is reduced to reduce the volume of the vibrator frame 300, thereby reducing the volume of the image transmission antenna.

[0063] S200, Laser activation is performed on the top of the oscillator frame 300 to form the first wiring layer 320 and the upper connecting line 340; In this embodiment, LDS technology is used to activate the top of the vibrator frame 300. Specifically, the top of the vibrator frame 300 is activated to form an upper connecting line 340, and each upper routing adjacent wall 312 formed between each upper clearance groove 311 on the top of the vibrator frame 300 is activated, so that a first routing layer 320 is formed on the surface of each upper routing adjacent wall 312.

[0064] S300, A lower clearance groove 313 is opened on the top of the vibrator frame 300; In this embodiment, a lower clearance groove 313 is provided at the bottom of the vibrator frame 300 so that the feed line 200 can be easily connected to the second wiring layer 330. At the same time, the bottom of the vibrator frame 300 is reduced to reduce the volume of the vibrator frame 300, thereby further reducing the volume of the image transmission antenna.

[0065] S400, Laser activation is performed on the bottom of the oscillator frame 300 to form the second wiring layer 330 and the lower connecting line 350; In this embodiment, LDS technology is used to activate the bottom of the vibrator frame 300. Specifically, the bottom of the vibrator frame 300 is activated to form the lower connecting line 350, and each lower routing adjacent wall 314 formed between each lower clearance groove 313 at the bottom of the vibrator frame 300 is activated, so that a second routing layer 330 is formed on the surface of each lower routing adjacent wall 314, and the second routing layer 330 is connected to the lower connecting line 350 through LDS technology.

[0066] S500, the inner conductor 210 is electrically connected to the upper connecting line 340 of the topmost oscillator frame 300, and the outer conductor 220 is electrically connected to the lower connecting line 350 of the topmost oscillator frame 300 and the upper connecting lines 340 and lower connecting lines 350 of the other oscillator frames 300 respectively. In this embodiment, the inner conductor 210 is electrically connected to the upper connecting line 340 of the topmost transducer frame 300 via direct ultrasonic bonding. This allows the inner conductor 210 to be directly coupled to the end point of the upper connecting line 340 at a single point. This reduces the multi-point coupling between the inner conductor 210 and multiple first wiring layers 320, preventing desoldering of the coupling connection between the inner conductor 210 and one of the first wiring layers 320, which could lead to a decrease in the performance of the image transmission antenna and avoid a decrease in the purity of the circularly polarized wave. The outer conductor 220 is electrically connected to the topmost transducer frame 300 via direct ultrasonic bonding. This reduces the ground coupling with the second wiring layer 330 of the topmost transducer frame 300, preventing impedance mismatch and pattern distortion, and further preventing a decrease in the purity of the circularly polarized wave. Meanwhile, the outer conductor 220 is also electrically connected to the upper connecting line 340 and the lower connecting line 350 of the resonator frame 300 by direct ultrasonic bonding. Since the outer conductor 220 is closer to the external space, the grounding distance can be expanded, the near-field coupling can be reduced, and the mutual inductance between the first wiring layer 320 and the second wiring layer 330 can be reduced, which can reduce noise interference of the image transmission antenna and make the purity of the circularly polarized wave higher.

[0067] S600, Install the vibrator frame 300 and the first end of the feeder 200 into the housing 100.

[0068] In this embodiment, after the first end of the vibrator frame 300 and the feed line 200 is installed inside the housing 100, the feed line 200 is then passed through the through hole 111 of the bottom cover 110 so that the bottom cover 110 can be placed inside the housing 100 and the housing 100 is sealed, so that the vibrator frame 300 is protected from external electromagnetic interference, which would cause a decrease in the purity of the circularly polarized wave.

[0069] Compared with the prior art, this disclosure has at least the following advantages: The aforementioned image transmission antenna is connected to an antenna device via the first end of the feed line 200, so that the antenna device inputs changing voltage and current into the feed line 200 from the first end of the feed line 200, and then feeds radio frequency signals into the vibrator frame 300 from the second end of the feed line 200, thereby exciting the first wiring layer 320 and the second wiring layer 330 to generate an electric field. Due to the changing voltage and current, a changing electric field is generated, and then a changing magnetic field is generated from the changing electric field to form an electromagnetic wave, which is then radiated into space through the electromagnetic wave image transmission antenna.

[0070] Since the length of the first circumferential line segment is the same as that of the second circumferential line segment, but their directions are opposite, a first horizontal electric field and a second horizontal electric field of the same magnitude but opposite directions are generated in the radial direction of the oscillator frame. Both the first and second horizontal electric fields are vectors, following the law of vector superposition, and the superposition occurs at the far-field observation point. Therefore, the first and second horizontal electric fields are superimposed to form a composite horizontal electric field, which is E. 水平totalSimultaneously, the first axial trace segment 322 generates a first vertical electric field, and the second axial trace segment 332 generates a second vertical electric field. Both the first and second vertical electric fields are vectors, following the vector superposition rule, and the superposition occurs at the far-field observation point. The first and second vertical electric fields are superimposed to form a composite vertical electric field, which is E. 垂直total .

[0071] Furthermore, the length of the first circumferential routing segment 321 is greater than the length of the first axial routing segment 322, and the length of the second circumferential routing segment 331 is greater than the length of the second axial routing segment 332, thus making ϕE 垂直total -ϕE 水平total =90°, the synthesized horizontal electric field and the synthesized vertical electric field are spatially orthogonal and rotate with a phase difference of 90°. That is, the synthesized horizontal electric field and the synthesized vertical electric field form an omnidirectional circularly polarized electromagnetic wave in the XY plane. This allows the image transmission antenna to radiate circularly polarized waves into space, suppressing multipath reflections and preventing signal attenuation. This ensures that the image transmission link between the UAV and the image transmission antenna can work stably to transmit image signals to the antenna equipment. See also Figure 4 At 5.0-7.0 GHz, the return loss is below -10 dB. (See [reference needed]) Figure 5 At 5.0-7.0 GHz, the VSWR is less than 2, resulting in good impedance matching for the image transmission antenna. (See also...) Figure 6 In the 5.0-7.0 GHz frequency band, the axial ratio of the image transmission antenna disclosed herein is less than 3 dB. See also... Figure 7 In this example, Figure 7 The simulation results show the circularly polarized 3D radiation pattern of the image transmission antenna at a frequency of 6 GHz. Figure 7 The image transmission antenna shown in this disclosure is a horizontally omnidirectional circularly polarized antenna. Thus, by setting the first circumferential trace 321 in the horizontal direction, vertical linear polarization can be generated. In the vertical direction, the first axial trace 322 generates horizontal linear polarization, forming a 90-degree phase difference in the XY plane. Therefore, a horizontal omnidirectional circularly polarized radiation characteristic is formed. The image transmission antenna structure disclosed in this invention is simple, and resonance can be achieved without connecting the image transmission antenna to an external feed network, radiating circularly polarized waves into space, thus reducing the complexity of the image transmission antenna equipment.

[0072] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. An image transmission antenna, comprising a feed line, wherein a first end of the feed line is used to connect to an antenna device, characterized in that, The image transmission antenna also includes: The vibrator frame includes a frame body, a first wiring layer and a second wiring layer, wherein the frame body is sleeved on the feeder; The first wiring layer includes a first circumferential wiring segment and a first axial wiring segment. The first circumferential wiring segment is arranged circumferentially along the outer peripheral wall of the frame, and the first axial wiring segment is arranged axially along the outer peripheral wall of the frame. One end of the first axial wiring segment is connected to the first circumferential wiring segment to form a first wiring bending area. One of the first circumferential wiring segment and the first axial wiring segment is electrically connected to the inner conductor of the second end of the feed line. The second wiring layer includes a second circumferential wiring segment and a second axial wiring segment. The second circumferential wiring segment is arranged circumferentially along the outer peripheral wall of the frame, and the second axial wiring segment is arranged axially along the outer peripheral wall of the frame. One end of the second axial wiring segment is connected to the second circumferential wiring segment to form a second wiring bending area. One of the second circumferential wiring segment and the second axial wiring segment is electrically connected to the outer conductor of the second end of the feed line. The first routing bend area and the second routing bend area are positioned opposite each other.

2. The image transmission antenna according to claim 1, characterized in that, The first circumferential routing segment and the second circumferential routing segment are spaced apart along the outer wall of the frame.

3. The image transmission antenna according to claim 1, characterized in that, The first circumferential routing segment includes a first routing line and a second routing line. The first routing line and the second routing line are axially spaced along the outer circumferential wall of the frame. Both the first routing line and the second routing line are connected to the first axial routing segment. The first routing line includes a plurality of sequentially connected first broken lines, and the second routing line includes a plurality of sequentially connected second broken lines.

4. The image transmission antenna according to claim 1, characterized in that, The second circumferential routing segment includes a third routing line and a fourth routing line. The third routing line and the fourth routing line are axially spaced along the outer circumferential wall of the frame. Both the third routing line and the fourth routing line are connected to the second axial routing segment. The third routing line includes a plurality of sequentially connected third broken lines, and the fourth routing line includes a plurality of sequentially connected fourth broken lines.

5. The image transmission antenna according to claim 1, characterized in that, The number of the vibrator frames is multiple, and the multiple vibrator frames are arranged sequentially from top to bottom along the axial direction of the feeder.

6. The image transmission antenna according to claim 5, characterized in that, The feed line includes an inner conductor and an outer conductor arranged sequentially from the inside to the outside. The second end of the inner conductor is electrically connected to the first wiring layer of the topmost dipole frame, and the second end of the outer conductor is electrically connected to the second wiring layer of the topmost dipole frame. The outer conductor is also electrically connected to the first and second wiring layers of the remaining dipole frames, respectively. The first ends of the inner conductor and the outer conductor are both used for electrical connection to the antenna equipment.

7. The image transmission antenna according to any one of claims 1 to 6, characterized in that, The top of the vibrator frame is provided with a plurality of upper clearance slots, each of which is spaced around the top of the vibrator frame, and an upper wiring adjacent wall is formed between each of the upper clearance slots. The first wiring layer is formed on the outer wall of the upper wiring adjacent wall; and / or, The bottom of the vibrator frame is provided with a plurality of lower avoidance grooves, each of the lower avoidance grooves being spaced around the bottom of the vibrator frame, and a lower wiring adjacent wall is formed between each of the lower avoidance grooves, and the second wiring layer is formed on the outer wall of the lower wiring adjacent wall.

8. The image transmission antenna according to claim 7, characterized in that, The top of the oscillator frame has several upper connecting lines. The starting point of each upper connecting line is located at the opening of each upper recess and is connected to the first wiring layer. The ending point of each upper connecting line converges at the top of the oscillator frame and is electrically connected to the second end of the inner conductor. The bottom of the oscillator frame has several lower connecting lines. The starting point of each lower connecting line is located at the opening of each lower recess and is connected to the second wiring layer. The ending point of each lower connecting line converges at the bottom of the oscillator frame and is electrically connected to the second end of the outer conductor.

9. A drone device, characterized in that, The image transmission antenna includes any one of claims 1 to 8.

10. A method for manufacturing an image transmission antenna, characterized in that, Used to manufacture the image transmission antenna according to any one of claims 1 to 8.

Images