Omnidirectional antenna for unmanned aircraft

Abstract

The invention relates to the technical field of omni-directional antennas, in particular to an omni-directional antenna for an unmanned aerial vehicle, which comprises a mounting plate, a fixed seat is fixed at the end position of the mounting plate, and a magnetic cap is fixed on the top surface of the mounting plate; wherein the mounting plate is provided with an antenna assembly, the antenna assembly comprises an antenna main rod, the antenna main rod is rotatably mounted on the fixed seat, the interior of the antenna main rod is hollow, the top end of the antenna main rod is fixedly provided with an end cap, the end cap is provided with a plurality of rotatable gain supporting rods, the interior of each gain supporting rod is hollow, and the gain supporting rods are fixed on the fixed seat. A spiral line is arranged in the antenna main rod, the end of the spiral line is connected with a plurality of gain lines, and the plurality of gain lines respectively penetrate into the plurality of gain supporting rods. The device has an automatic angle adjusting function, the use flexibility is improved, and the device can quickly adapt to different installation positions, signal propagation environments and communication task requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of omnidirectional antennas, in particular to an omnidirectional antenna for an unmanned aerial vehicle. Background Art

[0002] Omnidirectional antennas for unmanned aerial vehicles (UAVs) are key components for ensuring stable communication between UAVs and ground control stations, other equipment, or satellites. Omnidirectional antennas can achieve 360-degree uniform radiation in the horizontal direction, ensuring that the UAV maintains a reliable signal connection regardless of its orientation during flight.

[0003] After searching, it was found that according to the announcement number CN208849768U, a drone ground base station and drone communication system is connected. The GPS module is connected to the GPS antenna, the data transmission module is connected to the data transmission antenna, the 4G module is connected to the 4G antenna, and the router module is connected to the router antenna. The GPS module locates the base station and calibrates the drone coordinates using differential GPS. The data transmission module is connected to the handheld GPS module and the drone. During the marking process, the above solution receives the marking information from the handheld GPS module. After the marking is completed, it connects to the drone, communicates between the base station and the drone, and between the ground station and the drone, and transmits various information in real time. The above patent still has shortcomings in actual use. The antenna proposed in the above scheme is the same as the traditional omnidirectional antenna. Although the fixed rod-shaped structure can achieve 360-degree uniform radiation, the structure is single and lacks flexibility. It is difficult to adjust the signal strength in time according to the changes in the flight speed of the drone. When the drone is in a high-speed flight state, this fixed structure antenna cannot provide sufficiently stable signal support for the communication system, which may lead to problems such as decreased communication quality, data transmission interruption or delay in receiving control instructions.

[0004] Based on this, the present invention discloses an omnidirectional antenna for an unmanned aerial vehicle. Summary of the Invention

[0005] To address the problem that the omnidirectional antenna proposed in the background art does not have an automatic adjustment function, the present invention provides an omnidirectional antenna for an unmanned aerial vehicle, comprising a mounting plate, a fixing seat fixed at an end position of the mounting plate, and a magnetic cap fixed on the top surface of the mounting plate; The mounting plate is provided with an antenna assembly, which includes an antenna main pole, which is rotatably mounted on a fixing seat and is hollow inside. An end cap is fixed to the top of the antenna main pole, and a plurality of rotatable gain rods are provided on the end cap, each of which is hollow inside. A spiral line is arranged inside the antenna main pole, and the ends of the spiral line are connected to a plurality of gain lines, which are respectively inserted into the interiors of the plurality of gain rods. The mounting plate is provided with a pushing assembly for adjusting the angle of the antenna main pole, the pushing assembly includes a sealing cylinder, and the end position of the sealing cylinder is provided with a conducting assembly; The end cap is provided with a limit assembly for restricting the positions of the plurality of gain support rods; The antenna main pole is provided with a lifting assembly for expanding the plurality of gain support rods into an umbrella-like structure; Since signal transmission is unstable when the UAV is flying at high speed, this technical solution uses an automatically deployable gain strut to improve the signal transmission stability of the omnidirectional antenna. As a further improvement of the present technical solution, the antenna assembly also includes a plurality of slots, and the plurality of slots are all opened on the end cap, and the plurality of slots are distributed in a circumferential array around the axis of the end cap, a fixing rod is fixed in each of the slots, a rotating block is rotatably sleeved on each of the fixing rods, and the plurality of rotating blocks are respectively connected to a plurality of gain support rods, a plurality of hole positions 1 are opened on the end cap, and a hole position 2 is opened on each of the gain support rods, and the plurality of hole positions 1 and the plurality of hole positions 2 are used to allow a plurality of gain lines to pass through the interior of a plurality of gain support rods respectively.

[0006] On this basis, when the UAV is in a low-speed flight or the signal transmission is good, the plurality of gain rods are respectively located in the plurality of slots, and the antenna main rod and the plurality of gain rods are in a horizontal posture as a whole; As a further improvement of the present technical solution, the pushing assembly includes a cylinder, which is mounted on a mounting plate. The internal sealing sliding connection of the sealing cylinder is provided with a sliding plug. Oil is accumulated between the sealing cylinder and the sliding plug. A cross bar is fixed to the side of the sliding plug. The end of the cross bar away from the sliding plug extends to the outside of the sealing cylinder and is connected to the telescopic end of the cylinder. In the initial state, the sliding plug is located at the end of the sealing cylinder close to the cylinder, and an open mounting port is provided at the end of the sealing cylinder away from the cylinder. The outer peripheral surface of the sealing cylinder is hinged with a connecting rod.

[0007] In another solution, a propulsion assembly is used to adjust the angle of the antenna main mast. The horizontal rod is driven by a cylinder, which drives the annular cylinder through a sliding plug, a sealing cylinder, and a connecting rod, causing the antenna main mast to rotate. The operator can control the cylinder to adjust the angle, and it can automatically adjust to meet the different signal requirements in complex and changing environments. As a further improvement of the present technical solution, the conduction assembly includes a bracket and a fixed cover, the bracket is fixed inside the mounting opening, and a gap is formed between the bracket and the mounting opening, a movable plugging core is provided on the bracket, and the plugging core and the bracket are connected by a spring, a drain port is provided on the bracket, and the plugging core is arranged opposite the drain port; The fixed cover is fixed to the end of the sealing tube away from the cylinder. A through opening is opened on the fixed cover, and a pressure rod is inserted into the through opening. A fixed ring is fixed on one end of the pressure rod located outside the fixed cover. The fixing ring and the fixed cover are connected by a spring. The pressure rod is arranged opposite to the plug core, and a hose is connected to the fixed cover.

[0008] To achieve automatic oil supply, this technical solution provides a conduction component. When the cylinder pushes the antenna main pole to vertical, the fixed cover is inserted into the magnetic cap. After the pressure rod contacts the magnetic cap, it moves and squeezes the plug, so that it no longer blocks the drain port. At this time, the fixed cover and the sealing cylinder stop moving. The cylinder continues to operate, driving the sliding plug to move, pushing the oil in the sealing cylinder into the fixed cover through the drain port. As a further improvement of the present technical solution, the pressure rod is arranged opposite to the magnetic cap, and the fixed cover is made of magnetic material. When the fixed cover extends into the interior of the magnetic cap, the magnetic cap squeezes the pressure rod, and the magnetic cap and the fixed cover are attracted to each other. In order to ensure that the oil can be smoothly withdrawn when the sliding plug is reset, a magnetic cap is provided in this solution. During the reset process, the fixed cover is adsorbed on the magnetic cap under the action of magnetic force, and the pressure rod is in a state of squeezing the plug core, which makes the drain port always in a conductive state, so that the oil can flow back into the sealing cylinder. As a further improvement of the present technical solution, the limiting assembly includes a sealing seat, which is fixed at the top of the end cap, and the interior of the sealing seat is hollow. The interior of the sealing seat is sealingly and slidingly connected with a slider, and a push rod is fixed on the slider. The push rod extends to the outside of the sealing seat at one end away from the slider. The slider and the sealing seat are connected by a three-phase spring. A pull rod is provided at one end of the push rod located outside the sealing seat, and the pull rod has a U-shaped structure. A retaining ring is fixed on the pull rod, and the retaining ring is slidably sleeved on the end cap. The sealing seat is connected to the end of the hose away from the fixed cover.

[0009] In order to provide constraints for the gain struts, this solution provides a movable retaining ring. When the retaining ring blocks the gain struts, the gain struts cannot rotate freely. When the retaining ring is offset from the gain struts, each gain strut can rotate freely. As a further improvement of the present technical solution, the lifting assembly includes an annular cylinder, which is fixedly mounted on the antenna main pole and is hollow inside. The annular cylinder is hinged to the end of the connecting rod away from the sealing cylinder. The annular cylinder is sealed and slidably connected to an annular plug inside, and the annular plug is connected to the inner bottom surface of the annular cylinder by a spring four-phase connection. Two vertical rods are fixed on the annular plug, and the ends of the two vertical rods away from the annular plug extend to the outside of the annular cylinder and are connected to a top block. The annular cylinder and the sealing seat are connected by a connecting pipe, and a pressure relief valve is installed on the connecting pipe.

[0010] As a further improvement of the present technical solution, the top block is annular in structure, and the diameter of the top block at one end close to the annular cylinder is larger than the diameter of the end away from the annular cylinder.

[0011] As a further improvement of the present technical solution, the inner ring of the retaining ring fits in contact with the outer surface of the end cap.

[0012] As a further improvement of the present technical solution, the top block is arranged opposite to a plurality of gain support rods, and the end position of each of the gain support rods is chamfered.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The omnidirectional antenna of the present invention has an automatic angle adjustment function, which has significant advantages in practical applications. Faced with complex and changing environments, different scenarios have different requirements for antenna signal coverage and direction. The antenna can automatically adjust the antenna main pole angle according to actual conditions, improving the flexibility of use and can quickly adapt to different installation locations, signal propagation environments and communication task requirements. 2. When the aircraft is flying at high speed, the antenna main mast automatically rotates to a vertical position, effectively resisting the impact of high-speed airflow, significantly reducing the amplitude of shaking, ensuring stable signal transmission, avoiding signal interruption or attenuation caused by physical shaking, and ensuring that communication quality is not affected by flight conditions. The gain support rods simultaneously open into an umbrella-like structure, significantly expanding the effective radiation area of the antenna, improving the gain effect, and making the electromagnetic wave signal coverage wider and stronger, thereby maintaining efficient and stable communication with the ground or other equipment in complex flight environments; 3. The cylinder pushes the antenna main pole to the vertical position to trigger a series of mechanical actions. The design utilizes the contact between the magnetic cap and the pressure rod and the movement of the plug core to release the blockage of the drain port, thereby achieving a directional flow of oil from the sealing cylinder to the fixed cover and then to the annular cylinder. The annular plug, vertical rod and top block are then pushed by oil pressure, and finally the gain strut rotates synchronously and opens into an umbrella-shaped structure, which can ensure the gain strut is accurately deployed under specific conditions. At the same time, this mechanical drive method has a compact structure, fast response, and can operate stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Angle adjustment diagram of the present invention Figure 1 ; Figure 3 Angle adjustment diagram of the present invention Figure 2 ; Figure 4 is a structural schematic diagram of an antenna assembly; Figure 5 is a schematic cross-sectional structural diagram of an antenna assembly; Figure 6 for Figure 5 A magnified view of the structure at point A; Figure 7 for Figure 5 A magnified view of the structure at point B; Figure 8 It is a schematic diagram of the structure when several gain struts are opened; Figure 9 for Figure 8 A magnified view of the structure at C; Figure 10 Schematic diagram of the cross-sectional structure of the sealing cylinder; Figure 11 for Figure 10 A magnified view of the structure at D; Figure 12 Schematic diagram of the structure of the spiral line and several gain lines.

[0015] The meaning of each number in the figure is: 11. Mounting plate; 12. Fixing seat; 13. Magnetic cap; 21. Antenna main pole; 22. Helix; 23. End cap; 24. Slot; 25. Fixing rod; 26. Rotating block; 27. Gain support rod; 28. Gain line; 31. Cylinder; 32. Sealing tube; 33. Sliding plug; 34. Cross bar; 35. Mounting port; 36. Connecting rod; 41. Bracket; 42. Plug; 43. Spring 1; 44. Fixing cover; 45. Pressure rod; 46. Fixing ring; 47. Spring 2; 48. Hose; 51. Sealing seat; 52. Sliding block; 53. Push rod; 54. Spring 3; 55. Pull rod; 56. Retaining ring; 61. Annular tube; 62. Annular plug; 63. Spring 4; 64. Push block; 65. Vertical rod; 66. Connecting pipe; 67. Pressure relief valve. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] The angle of existing unmanned aerial vehicle omnidirectional antennas cannot be automatically adjusted and cannot provide stable signal transmission for aircraft flying at high speeds.

[0018] To this end, the present invention provides an omnidirectional antenna for unmanned aerial vehicles. Figure 1 As shown, it includes a mounting plate 11, a fixing seat 12 is fixed at the end position of the mounting plate 11, and a magnetic cap 13 is fixed on the top surface of the mounting plate 11; See also Figure 1 and Figure 7As shown, an antenna assembly is provided on the mounting plate 11, and the antenna assembly includes an antenna main pole 21, the antenna main pole 21 is rotatably mounted on the fixing seat 12, and the interior of the antenna main pole 21 is hollow, and an end cap 23 is fixed to the top of the antenna main pole 21, and a plurality of rotatable gain struts 27 are provided on the end cap 23, each gain strut 27 is hollow inside, and a spiral line 22 is arranged inside the antenna main pole 21, and the end of the spiral line 22 is connected to a plurality of gain lines 28, and the plurality of gain lines 28 are respectively inserted into the interior of the plurality of gain struts 27, and the antenna assembly also includes a plurality of slots 24, and the plurality of slots 24 are all opened on the end cap 23, and the plurality of slots 24 are respectively inserted into the interior of the plurality of gain struts 27. The slots 24 are arranged in a circumferential array around the axis of the end cap 23. A fixing rod 25 is fixed in each slot 24. A rotating block 26 is rotatably sleeved on each fixing rod 25. The rotating blocks 26 are respectively connected to a plurality of gain support rods 27. The end cap 23 is provided with a plurality of hole positions 1. Each gain support rod 27 is provided with a hole position 2. The plurality of hole positions 1 and the plurality of hole positions 2 are used to allow a plurality of gain wires 28 to pass through the interior of the plurality of gain support rods 27. A lifting assembly is provided on the antenna main pole 21 for expanding the plurality of gain support rods 27 into an umbrella-like structure. The lifting assembly includes an annular cylinder 61, which is fixedly sleeved on the antenna main pole 21. like Figure 1 As shown, in the initial state, the plurality of gain rods 27 are respectively located in the plurality of slots 24. At this time, each gain rod 27 is parallel to the antenna main rod 21. In this state, the antenna main rod 21 and the plurality of gain rods 27 form a rod-shaped structure as a whole. In the normal state, the antenna main rod 21 and the mounting plate 11 are parallel to each other. The mounting plate 11 is installed on the unmanned aerial vehicle. Relative to the unmanned aerial vehicle, the antenna main rod 21 is in a horizontal posture. See also Figure 1 、 Figure 2 and Figure 3 As shown, a pushing assembly is provided on the mounting plate 11 for adjusting the angle of the antenna main pole 21. The pushing assembly includes a sealing cylinder 32, and the pushing assembly includes a cylinder 31. The cylinder 31 is mounted on the mounting plate 11. The interior of the sealing cylinder 32 is sealingly and slidingly connected to a sliding plug 33. Oil is accumulated between the sealing cylinder 32 and the sliding plug 33. A cross bar 34 is fixed to the side of the sliding plug 33. The end of the cross bar 34 away from the sliding plug 33 extends to the outside of the sealing cylinder 32 and is connected to the telescopic end of the cylinder 31. In the initial state, the sliding plug 33 is located at the end of the sealing cylinder 32 close to the cylinder 31. The end of the sealing cylinder 32 away from the cylinder 31 is provided with an opening 35. The outer peripheral surface of the sealing cylinder 32 is hinged with a connecting rod 36. The omnidirectional antenna provided by the present invention has the function of angle adjustment. The angle of the antenna main pole 21 can be automatically adjusted according to the actual situation. Specifically, Figure 1 、 Figure 2 and Figure 3As described above, when the cylinder 31 is in operation, it can push the crossbar 34. When the crossbar 34 moves, it can drive the sealing cylinder 32 to move through the sliding plug 33. The sealing cylinder 32 and the annular cylinder 61 are connected by a connecting rod 36. When the sealing cylinder 32 moves, the connecting rod 36 can push the annular cylinder 61 to rotate the antenna main pole 21. Therefore, the staff can adjust the angle of the antenna main pole 21 by controlling the operation of the cylinder 31. In actual application scenarios, due to the complex and changeable environment, there are different requirements for the coverage range and direction of the antenna signal. The antenna can automatically adjust the angle of the antenna main pole 21 according to the actual situation, thereby improving the flexibility and adaptability of the antenna. See also Figure 10 and Figure 11 As shown, the end position of the sealing cylinder 32 is provided with a conducting component, and the end cap 23 is provided with a limit component for constraining the position of a plurality of gain struts 27. When the unmanned aerial vehicle is in a high-speed flight state, the device can automatically adjust the angle of the antenna main rod 21 so that the antenna main rod 21 and the mounting plate 11 are perpendicular to each other, as shown in FIG. Figure 3 In the state shown, in this case, compared with the unmanned aerial vehicle, the antenna main mast 21 is in a vertical posture. At the same time, under the coordinated action of the conduction component, the limit component and the lifting component, the plurality of gain struts 27 are synchronously opened and in an umbrella-like structure. On the one hand, the vertical posture of the antenna main mast 21 can better adapt to the airflow environment during high-speed flight, reduce the shaking and instability of the antenna caused by the impact of airflow during flight, ensure the stability of antenna signal transmission, avoid signal interruption or attenuation due to antenna shaking, and ensure communication quality. On the other hand, the gain struts 27 are opened into an umbrella-like structure, which increases the effective radiation area of the antenna and effectively improves the gain effect of the antenna. This structure can capture and transmit electromagnetic wave signals more widely, expand the signal coverage range, and enhance the signal strength, so that the unmanned aerial vehicle can still maintain a stable and efficient communication connection with the ground or other equipment during high-speed flight. See also Figure 11As shown, the conduction component includes a bracket 41 and a fixed cover 44. The bracket 41 is fixed inside the mounting port 35, and there is a gap between the bracket 41 and the mounting port 35. A movable plugging core 42 is provided on the bracket 41, and the plugging core 42 and the bracket 41 are connected by a spring 43. A drain port is provided on the bracket 41, the plugging core 42 is arranged opposite the drain port, and the pressure rod 45 is arranged opposite the magnetic cap 13. The fixed cover 44 is made of magnetic material. The fixed cover 44 is fixed to the end of the sealing tube 32 away from the cylinder 31. A through port is provided on the fixed cover 44, and a pressure rod 45 is inserted in the through port. The pressure rod 45 is located at A fixing ring 46 is provided on one end of the fixed cover 44. The fixing ring 46 is connected to the fixed cover 44 by a second spring 47. A pressure rod 45 is provided opposite to the plugging core 42. A hose 48 is connected to the fixed cover 44. The pressure rod 45 is provided opposite to the magnetic cap 13. The fixed cover 44 is made of a magnetic material. When the fixed cover 44 extends to the inside of the magnetic cap 13, the magnetic cap 13 squeezes the pressure rod 45, and the magnetic cap 13 and the fixed cover 44 are attracted to each other. In the initial state, under the elastic force of the first spring 43, the plugging core 42 blocks the drain port. At this time, the oil inside the sealing cylinder 32 cannot flow out through the drain port. When the antenna main rod 21 is rotated to the vertical position under the pushing action of the cylinder 31, Figure 3 As shown, at this time, the fixed cover 44 just extends to the inside of the magnetic cap 13. In this case, the pressure rod 45 will contact the magnetic cap 13. Under the blocking effect of the magnetic cap 13, the pressure rod 45 will move and squeeze the plug 42. When the plug 42 is pushed by the pressure rod 45, the plug 42 will move. At this time, the plug 42 no longer blocks the drain port on the bracket 41. Without the blocking effect of the plug 42, the oil can enter the interior of the fixed cover 44 through the drain port. Further, when the fixed cover 44 is inserted into the interior of the magnetic cap 13, the fixed cover 44 and the sealing cylinder 32 cannot continue to move, but the cylinder 31 still keeps running. At this time, the telescopic end of the cylinder 31 will drive the sliding plug 33 to move through the cross rod 34, so that the sliding plug 33 moves inside the sealing cylinder 32. In this process, the sliding plug 33 can push the oil in the sealing cylinder 32 into the interior of the fixed cover 44 through the drain port. See also Figure 7As shown, the limit assembly includes a sealing seat 51, which is fixed to the top of the end cap 23, and the interior of the sealing seat 51 is hollow. The interior of the sealing seat 51 is sealed and slidably connected to a slider 52, and a push rod 53 is fixed to the slider 52. The push rod 53 extends to the outside of the sealing seat 51 at one end away from the slider 52. The slider 52 and the sealing seat 51 are connected by a spring 54. A pull rod 55 is provided at one end of the push rod 53 located outside the sealing seat 51, and the pull rod 55 is in a U-shaped structure. A retaining ring 56 is fixed on the end cap 23 and is slidably mounted on the end cap 23. The inner ring of the retaining ring 56 fits in contact with the outer surface of the end cap 23. The sealing seat 51 is connected to the end of the hose 48 away from the fixed cover 44. In the initial state, under the elastic force of the spring 3 54, the slider 52 is located near the end cap 23. At this time, the retaining ring 56 is opposite to the plurality of slots 24. In this case, the retaining ring 56 can provide constraints for the plurality of gain struts 27, so that the plurality of gain struts 27 cannot rotate. The fixed cover 44 and the sealing seat 51 are connected by a hose 48. Under the push of the sliding plug 33, the oil enters the fixed cover 44 and then enters the interior of the sealing seat 51 through the hose 48. When the oil enters the sealing seat 51, the oil can push the slider 52 to move, so that the slider 52 drives the push rod 53 to move. Figure 7 and Figure 8 As shown, when the push rod 53 moves, the retaining ring 56 can be driven to move by the pull rod 55. When the push rod 53 and the retaining ring 56 move to the extreme position, the retaining ring 56 is in a state of being staggered with the plurality of slots 24. In this state, the retaining ring 56 no longer provides constraints for the plurality of gain struts 27, so that each gain strut 27 can rotate. See also Figure 6 As shown, the annular cylinder 61 is hollow inside, and the annular cylinder 61 is hinged to the end of the connecting rod 36 away from the sealing cylinder 32. The annular cylinder 61 is sealed and slidably connected with an annular plug 62 inside the annular cylinder, and the annular plug 62 is connected to the inner bottom surface of the annular cylinder 61 by a spring four 63. Two vertical rods 65 are fixed on the annular plug 62. The ends of the two vertical rods 65 away from the annular plug 62 extend to the outside of the annular cylinder 61 and are connected to a top block 64. The top block 64 is annular in structure. The diameter of the top block 64 close to the end of the annular cylinder 61 is larger than the diameter of the end away from the annular cylinder 61. The top block 64 is arranged opposite to the plurality of gain support rods 27. The end position of each gain support rod 27 is chamfered. The annular cylinder 61 is connected to the sealing seat 51 through a connecting pipe 66, and a pressure relief valve 67 is installed on the connecting pipe 66. When the sealing seat 51 is filled with oil, the movement of the sliding plug 33 is still in progress. At this time, the oil will continue to enter the sealing seat 51, which makes the oil pressure inside the sealing seat 51 gradually increase. When the oil pressure inside the sealing seat 51 is too high, the oil pressure can open the pressure relief valve 67. At this time, the oil can enter the interior of the annular cylinder 61 through the connecting pipe 66. Figure 6As shown, when the oil enters the annular cylinder 61, the oil pushes the annular plug 62, causing the annular plug 62 to drive the two vertical rods 65 to move upward. When the two vertical rods 65 move upward, the top block 64 moves upward accordingly. In this process, the top block 64 squeezes the multiple gain struts 27, causing the multiple gain struts 27 to rotate synchronously. When the top block 64 moves to the extreme position, the multiple gain struts 27 open together to form an umbrella-like structure, that is, Figure 8 In this state, the several gain struts 27 of the umbrella-shaped structure increase the effective radiation area of the antenna, effectively improving the gain effect of the antenna; It is worth noting that when the omnidirectional antenna is reset, the telescopic end of the cylinder 31 retracts. At this time, the telescopic end of the cylinder 31 can pull the slide 33 through the cross bar 34, but the fixed cover 44 is adsorbed on the magnetic cap 13 under the action of magnetic force, and the pressure rod 45 is in a state of squeezing the plug core 42, which makes the drain port always in a conductive state. Therefore, when the slide 33 is reset, it can perform an extraction action and draw the oil in the sealing seat 51 and the annular cylinder 61 back to the inside of the sealing cylinder 32. When the slide 33 moves to the extreme position, all the oil is drawn back. Further, the slide 33 drives the sealing cylinder 32 to move, and the sealing cover moves accordingly. When the sealing cover moves out of the magnetic cap 13, the pressure rod 45 will be reset under the action of spring 2 47, so that the plug core 42 is in a position to block the drain port again.

[0019] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0020] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An omnidirectional antenna for an unmanned aerial vehicle, characterized in that: It comprises a mounting plate (11), a fixing seat (12) is fixed at the end of the mounting plate (11), and a magnetic cap (13) is fixed on the top surface of the mounting plate (11); The mounting plate (11) is provided with an antenna assembly, the antenna assembly including an antenna main pole (21), the antenna main pole (21) is rotatably mounted on the fixing seat (12), and the interior of the antenna main pole (21) is hollow, an end cap (23) is fixed to the top end of the antenna main pole (21), and a plurality of rotatable gain support rods (27) are provided on the end cap (23), each of the gain support rods (27) is hollow, a spiral line (22) is arranged inside the antenna main pole (21), and the ends of the spiral line (22) are connected to a plurality of gain lines (28), and the plurality of gain lines (28) respectively penetrate into the interior of the plurality of gain support rods (27); A pushing assembly is provided on the mounting plate (11) for adjusting the angle of the antenna main rod (21); the pushing assembly includes a sealing cylinder (32); and a conducting assembly is provided at the end of the sealing cylinder (32); A limiting assembly is provided on the end cap (23) for constraining the positions of the plurality of gain support rods (27); A lifting assembly is provided on the antenna main pole (21) for enabling a plurality of the gain support poles (27) to be opened into an umbrella-shaped structure.

2. The omnidirectional antenna for an unmanned aerial vehicle according to claim 1, wherein: The antenna assembly further comprises a plurality of slots (24), wherein the plurality of slots (24) are all provided on the end cap (23), and the plurality of slots (24) are distributed in a circumferential array around the axis of the end cap (23), a fixing rod (25) is fixed in each of the slots (24), a rotating block (26) is rotatably sleeved on each of the fixing rods (25), and the plurality of rotating blocks (26) are respectively connected to a plurality of gain support rods (27), a plurality of hole positions 1 are provided on the end cap (23), and a plurality of hole positions 2 are provided on each of the gain support rods (27), and the plurality of hole positions 1 and the plurality of hole positions 2 are used to allow a plurality of gain lines (28) to pass through the interior of the plurality of gain support rods (27), respectively.

3. The omnidirectional antenna for an unmanned aerial vehicle according to claim 2, wherein: The pushing assembly includes a cylinder (31), which is mounted on a mounting plate (11). The interior of the sealing cylinder (32) is sealed and slidably connected to a sliding plug (33). Oil is accumulated between the sealing cylinder (32) and the sliding plug (33). A cross bar (34) is fixed to the side of the sliding plug (33). The end of the cross bar (34) away from the sliding plug (33) extends to the outside of the sealing cylinder (32) and is connected to the telescopic end of the cylinder (31). In an initial state, the sliding plug (33) is located at the end of the sealing cylinder (32) close to the cylinder (31). An opening (35) is provided at the end of the sealing cylinder (32) away from the cylinder (31). A connecting rod (36) is hinged to the outer peripheral surface of the sealing cylinder (32).

4. The omnidirectional antenna for an unmanned aerial vehicle according to claim 3, wherein: The conduction assembly includes a bracket (41) and a fixed cover (44), the bracket (41) is fixed inside the mounting opening (35), and a gap is provided between the bracket (41) and the mounting opening (35), a movable plugging core (42) is provided on the bracket (41), and the plugging core (42) and the bracket (41) are connected via a spring (43), a drain port is provided on the bracket (41), and the plugging core (42) is provided opposite to the drain port; The fixed cover (44) is fixed to one end of the sealing tube (32) away from the cylinder (31), and a through hole is opened on the fixed cover (44), and a pressure rod (45) is inserted into the through hole. One end of the pressure rod (45) located outside the fixed cover (44) is fixedly sleeved with a fixing ring (46), and the fixing ring (46) and the fixed cover (44) are connected by a spring (47). The pressure rod (45) is arranged opposite to the plug (42), and a hose (48) is connected to the fixed cover (44).

5. The omnidirectional antenna for an unmanned aerial vehicle according to claim 4, characterized in that: The pressure rod (45) is arranged opposite to the magnetic cap (13), and the fixed cover (44) is made of a magnetic material. When the fixed cover (44) extends into the interior of the magnetic cap (13), the magnetic cap (13) presses the pressure rod (45), and the magnetic cap (13) and the fixed cover (44) are attracted to each other.

6. The omnidirectional antenna for an unmanned aerial vehicle according to claim 5, characterized in that: The limiting assembly includes a sealing seat (51), the sealing seat (51) is fixed on the top of the end cap (23), and the interior of the sealing seat (51) is hollow, the interior of the sealing seat (51) is sealingly and slidingly connected to a slider (52), a push rod (53) is fixed on the slider (52), and the push rod (53) extends to the outside of the sealing seat (51) at one end away from the slider (52), and the slider (52) and the sealing seat (51) are connected by a spring three (54), a pull rod (55) is provided at one end of the push rod (53) located outside the sealing seat (51), and the pull rod (55) is U-shaped, a retaining ring (56) is fixed on the pull rod (55), and the retaining ring (56) is slidably sleeved on the end cap (23), and the sealing seat (51) is connected to the end of the hose (48) away from the fixed cover (44).

7. The omnidirectional antenna for an unmanned aerial vehicle according to claim 6, characterized in that: The lifting assembly includes an annular cylinder (61), which is fixedly sleeved on the antenna main pole (21) and is hollow inside. The annular cylinder (61) is hinged to one end of the connecting rod (36) away from the sealing cylinder (32). The annular cylinder (61) is sealed and slidably connected to an annular plug (62) inside, and the annular plug (62) is connected to the inner bottom surface of the annular cylinder (61) through a spring four (63). Two vertical rods (65) are fixed on the annular plug (62), and the ends of the two vertical rods (65) away from the annular plug (62) extend to the outside of the annular cylinder (61) and are connected to a top block (64). The annular cylinder (61) is connected to the sealing seat (51) through a connecting pipe (66), and a pressure relief valve (67) is installed on the connecting pipe (66).

8. The omnidirectional antenna for an unmanned aerial vehicle according to claim 7, wherein: The top block (64) has an annular structure, and the caliber of the top block (64) at one end close to the annular cylinder (61) is larger than the caliber of the end away from the annular cylinder (61).

9. The omnidirectional antenna for an unmanned aerial vehicle according to claim 6, wherein: The inner ring of the retaining ring (56) is in contact with the outer surface of the end cap (23).

10. The omnidirectional antenna for an unmanned aerial vehicle according to claim 8, wherein: The top block (64) is arranged opposite to a plurality of gain support rods (27), and the end of each gain support rod (27) is rounded.

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