A folding antenna of a UAV, a UAV and a launching structure thereof

Abstract

The utility model provides a kind of unmanned plane folding antenna, unmanned plane and its launch structure, belong to antenna installation technical field, including fixed seat and antenna assembly, the fixed seat is used to be connected with the fuselage of unmanned plane;The antenna assembly is rotationally arranged on the fixed seat, the antenna assembly has unfolded position, reset piece for driving the antenna assembly movement to the unfolded position is arranged between the fixed seat and the antenna assembly, the reset piece is used to drive antenna assembly movement to the unfolded position, clamping structure is arranged between the fixed seat and the antenna assembly, when the antenna assembly is located in the unfolded position, the antenna assembly is clamped with the fixed seat, to limit the relative position between the antenna assembly and the fixed seat.When antenna assembly is located in unfolded position, antenna assembly is clamped with fixed seat, limit the relative position between rotating seat and fixed seat, ensure the timeliness and effectiveness of signal receiving and launching in the process of unmanned plane flight.

Description

Technical Field

[0001] This utility model belongs to the field of antenna installation technology, and in particular relates to a foldable antenna for unmanned aerial vehicles (UAVs), the UAV and its launching structure. Background Technology

[0002] A canister-launched UAV is a UAV system that uses a dedicated launch canister for storage, transportation, and launch. The UAV is stored folded inside the launch canister, with its wings, rotor, and other components pressed against the canister wall. After exiting the canister using a specific launch method, the UAV's wings unfold, allowing it to enter flight. To transmit signals, the UAV is equipped with a rod-shaped antenna, which typically extends from the UAV's fuselage to meet its signal reception and transmission needs. Because the rod-shaped antenna protrudes beyond the cross-section of the launch canister, when launching from inside the canister, the antenna is placed in a folded position along with the UAV to avoid interference with the canister wall. After the UAV leaves the launch canister, the rod-shaped antenna automatically returns to its original signal transmission and reception position, now in its unfolded state, allowing for switching between the antenna's pre-launch and post-launch installation states.

[0003] However, currently, when a drone leaves the transmitting tube rod antenna and returns to the signal receiving / transmitting position, because there is no fixed structure between the rod antenna and the drone body, the rod antenna is prone to swaying and shaking during the drone's flight, which may affect the drone's signal reception and transmission, and thus potentially affect the drone's flight safety. This problem urgently needs to be solved. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a foldable antenna for unmanned aerial vehicles (UAVs), an UAV and its transmitting structure, to solve the problems in the prior art where the rod antenna is prone to swaying and shaking during the flight of the UAV due to the lack of a fixed structure between the rod antenna and the UAV, which affects the reception and transmission of UAV signals.

[0005] To achieve the above and other related objectives, this utility model provides a foldable antenna for unmanned aerial vehicles (UAVs), comprising: A mounting base for connecting to the fuselage of the drone body; An antenna assembly is rotatably mounted on a fixed base. The antenna assembly has an unfolded position. A reset member is provided between the fixed base and the antenna assembly to move the antenna assembly to the unfolded position. The reset member is used to move the antenna assembly to the unfolded position. A snap-fit ​​structure is provided between the fixed base and the antenna assembly. When the antenna assembly is in the unfolded position, the antenna assembly snaps into the fixed base to limit the relative position between the antenna assembly and the fixed base.

[0006] Optionally, the antenna assembly further includes a rotating base and a rod-shaped antenna body. The rotating base has opposite mounting surfaces and a contact surface. The rod-shaped antenna body is disposed on the mounting surface of the rotating base. The rotating base is rotatably connected to the fixed base. The fixed base has a clearance groove to avoid the rotating base. When the antenna assembly is in the unfolded position, the contact surface is located in the clearance groove and faces the bottom of the clearance groove.

[0007] Optionally, the axial direction of the rod-shaped antenna body is perpendicular to the mounting surface of the rotating seat.

[0008] Optionally, the antenna assembly includes a rod-shaped antenna body and also has a folded-down position, wherein when the antenna assembly is in the folded-down position, the axial direction of the rod-shaped antenna body is parallel to the launch direction of the UAV.

[0009] Optionally, the snap-fit ​​structure includes a snap pin and a pin hole that mates with the snap pin. The locking pin is retractably mounted on the fixed base, and the pin hole is opened on the rotating base. When the antenna assembly is in the unfolded position, the locking pin extends into the pin hole. Alternatively, the locking pin can be retractably mounted on the rotating base, and the pin hole is opened on the fixed base. When the antenna assembly is in the unfolded position, the locking pin extends into the pin hole.

[0010] Optionally, the reset element is a torsion spring, and the axial extension line of the torsion spring is located on the axial extension line of the shaft that rotatably connects the antenna assembly and the mounting base.

[0011] This utility model provides a drone, including a drone body and a drone folding antenna as described above, wherein the drone body is provided with the drone folding antenna.

[0012] This utility model provides a drone launch structure, including a launch tube and a drone as described above. The antenna assembly of the drone has a folded-down position. When the antenna assembly is in the folded-down position, the drone is disposed inside the launch tube for launch.

[0013] Optionally, a plurality of launch tube rollers are provided on the inner wall of the launch tube. The rotation axis of the launch tube rollers is perpendicular to the launch direction of the UAV. The plurality of launch tube rollers are arranged sequentially on the inner wall of the launch tube along the launch direction of the UAV. The plurality of launch tube rollers arranged along the launch direction of the UAV constitute a set of launch tube roller groups. Multiple sets of launch tube roller groups are provided inside the launch tube to set the distance between the UAV and the inner wall of the launch tube. The tangent direction of each launch tube roller at the contact point with the UAV is parallel to the launch direction of the UAV. The launch tube rollers are used to support and carry the UAV. There is a placement gap between two adjacent sets of launch tube roller groups for placing the antenna assembly.

[0014] Optionally, the UAV launching structure further includes an auxiliary slider located between the antenna assembly and the inner wall of the launching tube. The auxiliary slider has a blocking surface that is in contact with the antenna assembly and is located on the movement trajectory of the antenna assembly. The auxiliary slider also has a sliding surface that is in contact with the inner wall of the launching tube, and the ends of the sliding surface are all raised in a direction away from the inner wall of the launching tube.

[0015] As described above, the folding antenna for unmanned aerial vehicles (UAVs), the UAV, and its transmitting structure of this utility model have the following beneficial effects: By rotating the antenna assembly onto the fixed base, when the UAV needs to transmit, the antenna assembly can rotate relative to the fixed base so that the UAV can be placed inside the transmitting tube for transmission. After the UAV flies out of the transmitting tube, the reset component can drive the antenna assembly back to the unfolded position for transmitting and receiving UAV signals. When the antenna assembly is in the unfolded position, the antenna assembly is engaged with the fixed base, limiting the relative position between the rotating base and the fixed base. This can prevent the antenna assembly from swinging and shaking during the flight of the UAV, ensuring the timeliness and effectiveness of signal transmission and reception during the flight of the UAV. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the drone according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of the mounting base and antenna assembly according to an embodiment of the present invention.

[0018] Figure 3 for Figure 2 A cross-sectional view at point AA.

[0019] Figure 4 This is a side view of the mounting base and antenna assembly according to an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the launch tube and the drone according to an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the cooperation structure of the fixing base, antenna assembly and auxiliary slider in an embodiment of this utility model.

[0022] Figure 7 for Figure 6 A cross-sectional view of section BB.

[0023] Figure 8 This is a side view of the mounting base, antenna assembly, and auxiliary slider in an embodiment of the present invention.

[0024] Labeling Explanation: 1. UAV body; 2. Antenna assembly; 3. Mounting base; 4. Rotating base; 5. Rod-shaped antenna body; 6. Auxiliary slider; 7. Spring mounting block; 8. Spring; 9. Torsion spring; 10. Snap-fit ​​protrusion; 11. Locking pin; 12. Limiting part; 13. Clearance groove; 14. Launch tube roller; 15. Launch tube; 16. Spring mounting hole; 17. Rotating shaft; 18. Guide slope. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0026] Please see Figures 1 to 8 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0027] Therefore, based on this, the present invention is proposed. To provide a detailed description of the present invention, the following will specifically illustrate a foldable antenna for a drone, the drone itself, and its launching structure: Please combine Figures 1 to 8As shown, this utility model provides a folding antenna for a drone, including a fixed base 3 and an antenna assembly 2. The fixed base 3 is used to connect to the fuselage of the drone. The antenna assembly 2 is rotatably mounted on the fixed base 3 and has an unfolded position. A reset member is provided between the fixed base 3 and the antenna assembly 2 to drive the antenna assembly 2 to the unfolded position. The reset member is used to drive the antenna assembly 2 to the unfolded position. A snap-fit ​​structure is provided between the fixed base 3 and the antenna assembly 2. When the antenna assembly 2 is in the unfolded position, the antenna assembly 2 is snapped into the fixed base 3 to limit the relative position between the rotating base 4 and the fixed base 3. By rotating the antenna assembly 2 onto the fixed base 3, when the UAV needs to launch, the antenna assembly 2 can rotate relative to the fixed base 3 so that the UAV can be placed inside the launch tube for launch. After the UAV flies out of the launch tube 15, the reset component can drive the antenna assembly 2 back to the deployed position for UAV signal transmission and reception. When the antenna assembly 2 is in the deployed position, the antenna assembly 2 is engaged with the fixed base 3, limiting the relative position between the antenna assembly 2 and the fixed base 3. This prevents the antenna assembly 2 from swinging or shaking during UAV flight, ensuring the timeliness and effectiveness of UAV signal transmission and reception during flight.

[0028] like Figures 2 to 4 and Figures 6 to 8 As shown, the antenna assembly 2 also includes a rotating base 4 and a rod-shaped antenna body 5. The rotating base 4 has opposing mounting surfaces and a contact surface. The rod-shaped antenna body 5 is mounted on the mounting surface of the rotating base 4. The rotating base 4 is rotatably connected to the fixed base 3. The fixed base 3 has a clearance groove 13 to avoid the rotating base 4. When the antenna assembly 2 is in the unfolded position, the contact surface is located in the clearance groove 13 and faces the bottom of the clearance groove 13. By providing a clearance groove 13 on the fixed base 3 to accommodate part of the rotating base 4, the overall volume of the antenna assembly 2 and the fixed base 3 can be reduced when the antenna assembly 2 is in the unfolded position. Furthermore, while ensuring the inherent functions of the fixed base 3 and the antenna assembly 2, the weight of the fixed base 3 can be reduced through the clearance groove 13. Simultaneously, since the antenna assembly 2 can be accommodated in the clearance groove 13 when in the unfolded position, the area of ​​the opposing surfaces between the fixed base 3 and the antenna assembly 2 is increased, thereby reducing the difficulty of setting up a snap-fit ​​structure between the fixed base 3 and the antenna assembly 2.

[0029] In this embodiment, the fixed base 3 is a strip-shaped U-shaped steel, and the U-shaped groove of the strip-shaped U-shaped steel is the aforementioned clearance groove 13. The rotating base 4 is long and narrow, with one end of the strip-shaped U-shaped steel rotatably connected to one end of the rotating base 4. A reset member is provided between the rotating base 4 and the antenna assembly 2. When the reset member drives the antenna assembly 2 to the unfolded position, the extension direction of the rotating base 4 is parallel to the extension direction of the fixed base 3.

[0030] Specifically, the axis of the rod-shaped antenna body 5 is perpendicular to the mounting surface of the rotating seat 4, which makes the appearance of the folding antenna of the UAV more neat and aesthetically pleasing. In this embodiment, the cross-section of the mounting seat is U-shaped, the virtual plane with the U-shaped opening of the mounting seat is the aforementioned contact surface, and the surface opposite to the contact surface is the mounting surface. The mounting surface is parallel to the surface of the fixing seat 3 that is in contact with the body of the UAV body 1, thereby making the rod-shaped antenna body 5 perpendicular to the body of the UAV body 1. This maximizes the distance between the signal transmitting and receiving ends of the rod-shaped antenna body 5 and the body of the UAV body 1 when the length of the rod-shaped antenna body 5 is constant, ensuring that the influence of the body of the UAV body 1 on the signal transmission and reception of the rod-shaped antenna body 5 is minimized when transmitting and receiving signals. The U-shaped cross-section of the mounting seat can reduce the weight of the mounting seat to a certain extent, thereby reducing the overall weight of the UAV and the energy consumption required for the UAV to overcome its own gravity during operation.

[0031] The antenna assembly 2 includes a rod-shaped antenna body 5 and a folded-down position. When the antenna assembly 2 is in the folded-down position, the axial direction of the rod-shaped antenna body 5 is parallel to the launch direction of the UAV. It should be noted that the folded-down position means that the projections of each part of the antenna assembly 2 along the launch direction of the UAV are close to the UAV body 1. By rotating the antenna assembly 2 to the folded-down position and installing it into the launch tube 15, the antenna assembly 2 is folded and retracted without changing the original size of the launch tube 15. This allows the antenna assembly 2 to be retracted and placed inside the launch tube as much as possible, preventing interference between the antenna assembly 2 and the tube wall when the UAV launches from inside the launch tube 15, thus avoiding any impact on the UAV's launch. Meanwhile, the axial direction of the rod antenna body 5 is parallel to the launch direction of the drone, which can avoid interference between the rod antenna body 5 and other components inside the launch tube 15 when the rod antenna body 5 is in the inverted position. For example, if the launch tube 15 is equipped with a launch tube roller 14 for rolling during drone launch, the axial direction of the rod antenna body 5 is parallel to the launch direction of the drone, which can better avoid objects such as the launch tube roller 14 inside the launch tube 15. Since the wind resistance experienced by the rod antenna body 5 is minimized when the axial direction of the rod antenna body 5 is parallel to the launch direction of the drone, the wind resistance experienced by the antenna assembly 2 can also be minimized when launching the drone, thereby reducing the overall wind resistance experienced by the drone and ensuring the effectiveness of the drone launch.

[0032] In this embodiment, the snap-fit ​​structure includes a snap-fit ​​pin 11 and a pin hole that mates with the snap-fit ​​pin 11. The snap-fit ​​pin 11 is telescopically mounted on the fixed base 3 via a spring 8. A spring mounting block 7 is mounted on the fixed base 3, and a spring mounting hole 16 is provided on the spring mounting block 7. The opening of the spring mounting hole 16 of the spring mounting block 7 is connected to the fixed base 3. The fixed base 3 has a snap-fit ​​pin 11 through hole corresponding to the spring mounting hole 16. The snap-fit ​​pin 11 through hole connects the clearance groove 13 and the spring mounting hole 16. The snap-fit ​​pin 11 has an insertion part for mates with the pin hole and a part for mates with the spring mounting block. The connecting part of the 7-connector is sequentially connected to the insertion part and the connecting part along the axial direction of the latch 11. A latching protrusion 10 is provided around the axial direction of the latch 11 in the circumferential direction of the connecting part. The insertion part of the latch 11 enters the clearance groove 13 through the latch 11 through hole, and the length of the latch 11 entering the clearance groove 13 is limited by the latching protrusion 10 on the connecting part. One end of the spring 8 is connected to the latching protrusion 10 on the connecting part of the latch 11, and the other end of the latch 11 is connected to the bottom of the spring setting hole 16. The spring 8 is always in a compressed state during the movement of the latch 11. The spring 8, the spring setting hole 16, the latch 11 through hole, and the latch 11 are all coaxially arranged to facilitate the extension and retraction of the latch 11. A pin hole is opened on the rotating seat 4, corresponding to the latch 11. When the antenna assembly 2 is in the unfolded position, the latch 11 extends into the pin hole. In some embodiments, the locking pin 11 is retractably mounted on the rotating base 4, and the pin hole is formed on the fixed base 3. When the antenna assembly 2 is in the deployed position, the locking pin 11 extends into the pin hole. The structure of the locking pin 11 retractably mounted on the rotating base 4 is similar to the structure of the locking pin 11 retractably mounted on the fixed base 3, and will not be described again here. The hole and the arrangement of the locking pin 11 can be adjusted according to actual usage needs.

[0033] In this embodiment, when the antenna assembly 2 moves from the folded position to the unfolded position, a guide ramp 18 is provided at the initial contact point of the rotating seat 4 with the locking pin 11. This guide ramp 18 guides the locking pin 11 partially out of the clearance groove 13 and guides the locking pin 11 into the locking pin 11 hole. By providing the guide ramp 18, the situation where the locking pin 11, due to its excessive extension length, obstructs the rotating seat 4 from entering the clearance groove 13 when it contacts the rotating seat 4 can be avoided. In this embodiment, the end of the locking pin 11 located at the locking part is semi-circular. Through the cooperation between the locking part and the guide ramp 18, the smoothness of the rotating seat 4 entering the clearance groove 13 can be further ensured.

[0034] In this embodiment, the reset element is a torsion spring 9. The fixed seat 3 and the rotating seat 4 are rotatably connected by a rotating shaft 17. The torsion spring 9 is sleeved on the rotating shaft 17. The axial extension line of the torsion spring 9 is located on the axial extension line of the rotating shaft 17 that rotatably connects the antenna assembly 2 and the fixed seat 3. The torsion spring 9 is used to drive the antenna assembly 2 to the deployed position, so that after the UAV exits the launch tube 15, the antenna assembly 2 can move to the deployed position under the drive of the torsion spring 9, so that the signal transceiver end of the rod antenna body 5 is as far away from the fuselage of the UAV body 1 as possible, so that the rod antenna body 5 can better transmit and receive signals. The torsion spring 9 has the advantages of low price, high fatigue limit, and good plasticity and toughness. In some embodiments, the reset element is a spring 8. One end of the spring 8 is connected to the rotating seat 4, and the other end of the spring 8 is connected to the fixed seat 3. The spring 8 is always in a compressed state during the movement of the rotating seat 4, or the spring 8 is in a compressed state during the movement of the rotating seat 4 (except when the antenna assembly 2 is in the unfolded position). When the antenna assembly 2 is in the unfolded position, the spring 8 is in a natural state, that is, the spring 8 is in its original length without stretching or compression.

[0035] In this embodiment, the rotating seat 4 is provided with a limiting part 12 that cooperates with the opening of the clearance groove 13 of the fixed seat 3. When the antenna assembly 2 rotates into the clearance groove 13 to the unfolded position, the limiting part 12 abuts against the edge of the opening of the clearance groove 13 of the fixed seat 3 to prevent the rotating seat 4 from continuing to enter the clearance groove 13 under the drive of the reset member, while facilitating the locking pin 11 to enter the locking pin 11 hole.

[0036] like Figure 1 As shown, this utility model provides a drone, including a drone body 1 and a drone folding antenna as described above. The drone body is equipped with the drone folding antenna.

[0037] like Figures 5 to 8 As shown, this utility model provides a drone launch structure, including a launch tube 15 and the drone as described above. The antenna assembly 2 of the drone has a folded-down position. When the antenna assembly 2 is in the folded-down position, the drone is placed inside the launch tube 15 for launch. Since the rod-shaped antenna body 5 will interfere with the tube wall of the launch tube 15 when transmitting and receiving signals, by rotating and folding the antenna assembly 2 to the folded-down position, the antenna assembly 2 and the drone body 1 can be placed in the launch tube 15 at the same time for drone launch without changing the size of the launch tube 15. This avoids interference between the antenna assembly 2 and the tube wall of the launch tube 15 during launch, and has good economic efficiency and industrial promotion value.

[0038] The launch tube 15 has multiple launch tube rollers 14 mounted on its inner wall. The rotation axis of each launch tube roller 14 is perpendicular to the launch direction of the UAV. These rollers are arranged sequentially along the launch direction, forming a group of 14. Multiple groups of 14 are installed within the launch tube 15 to maintain a suitable distance between the UAV and the inner wall. The tangent at the contact point between each roller and the UAV is parallel to the launch direction. These rollers support and carry the UAV. A gap exists between adjacent groups of 14 for placing the antenna assembly 2. By mounting the launch tube rollers 14 on the inner wall of the launch tube 15, the sliding friction between the UAV and the inner wall is converted into static friction, thus reducing wear caused by sliding friction during launch.

[0039] Specifically, the UAV launch structure also includes an auxiliary slider 6, located between the antenna assembly 2 and the inner wall of the launch tube 15. The auxiliary slider 6 separates the antenna assembly 2 from the inner wall of the launch tube 15, ensuring that the antenna assembly 2 separates from the inner wall of the launch tube 15 during launch, thus preventing mutual wear between the antenna assembly 2 and the inner wall of the launch tube 15. The auxiliary slider 6 has a blocking surface that contacts the antenna assembly 2, located on the movement trajectory of the antenna assembly 2. By setting the blocking surface, the auxiliary slider 6 can move with the UAV during launch, thus remaining between the antenna assembly 2 and the inner wall of the launch tube 15 throughout the launch process, protecting the antenna assembly 2 from friction and wear between it and the inner wall of the launch tube 15. The auxiliary slider 6 has a sliding surface that adheres to the inner wall of the launch tube 15. The ends of the sliding surface are all curved away from the inner wall of the launch tube 15. This prevents the auxiliary slider 6 from sliding poorly due to unevenness in the inner wall of the launch tube 15. A receiving groove matching the antenna assembly 2 is provided on the side of the auxiliary slider 6 opposite to the sliding surface. The shape of this receiving groove conforms to the shape of the antenna assembly 2. When the UAV is inside the launch tube 15, the auxiliary slider 6 is restrained by the antenna assembly 2 to the inner wall of the launch tube 15, and thus moves with the UAV. When the UAV flies away from the launch tube 15, the auxiliary slider 6, no longer restrained by the inner wall of the launch tube 15, slides off the antenna assembly 2. The antenna assembly 2, driven by the reset component, reaches the deployed position, allowing the rod-shaped antenna body 5 on the UAV body 1 to transmit and receive signals normally, thereby ensuring the normal operation of the UAV.

[0040] In summary, by rotating the antenna assembly 2 onto the fixed base 3, when the UAV needs to launch, the antenna assembly 2 can rotate relative to the fixed base 3 so that the UAV can be placed inside the launch tube for launch. After the UAV flies out of the launch tube 15, the reset component can drive the antenna assembly 2 back to the deployed position for UAV signal transmission and reception. When the antenna assembly 2 is in the deployed position, the antenna assembly 2 is engaged with the fixed base 3, limiting the relative position between the rotating base 4 and the fixed base 3. This prevents the antenna assembly 2 from swinging or shaking during UAV flight, ensuring the timeliness and effectiveness of UAV signal transmission and reception during flight.

[0041] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A foldable antenna for unmanned aerial vehicles (UAVs), characterized in that, include: A mounting base for connecting to the fuselage of the drone body; An antenna assembly is rotatably mounted on a fixed base. The antenna assembly has an unfolded position. A reset member is provided between the fixed base and the antenna assembly to move the antenna assembly to the unfolded position. The reset member is used to move the antenna assembly to the unfolded position. A snap-fit ​​structure is provided between the fixed base and the antenna assembly. When the antenna assembly is in the unfolded position, the antenna assembly snaps into the fixed base to limit the relative position between the antenna assembly and the fixed base.

2. The foldable antenna for unmanned aerial vehicles according to claim 1, characterized in that: The antenna assembly further includes a rotating base and a rod-shaped antenna body. The rotating base has opposite mounting surfaces and a contact surface. The rod-shaped antenna body is disposed on the mounting surface of the rotating base. The rotating base is rotatably connected to the fixed base. The fixed base has a clearance groove to avoid the rotating base. When the antenna assembly is in the unfolded position, the contact surface is located in the clearance groove and faces the bottom of the clearance groove.

3. The foldable antenna for unmanned aerial vehicles according to claim 2, characterized in that: The axial direction of the rod-shaped antenna body is perpendicular to the mounting surface of the rotating base.

4. The foldable antenna for unmanned aerial vehicles according to claim 1, characterized in that: The antenna assembly includes a rod-shaped antenna body and also has a folded-down position. When the antenna assembly is in the folded-down position, the axial direction of the rod-shaped antenna body is parallel to the launch direction of the UAV.

5. The folding antenna for unmanned aerial vehicles according to claim 2 or 3, characterized in that: The snap-fit ​​structure includes a snap-fit ​​pin and a pin hole that mates with the snap-fit ​​pin. The locking pin is retractably mounted on the fixed base, and the pin hole is opened on the rotating base. When the antenna assembly is in the unfolded position, the locking pin extends into the pin hole. Alternatively, the locking pin can be retractably mounted on the rotating base, and the pin hole is opened on the fixed base. When the antenna assembly is in the unfolded position, the locking pin extends into the pin hole.

6. The foldable antenna for unmanned aerial vehicles according to any one of claims 1-4, characterized in that: The reset element is a torsion spring, and the axial extension line of the torsion spring is located on the axial extension line of the shaft that rotatably connects the antenna assembly and the fixed base.

7. A drone, characterized in that, The device includes a drone body and a drone folding antenna as described in any one of claims 1-6, wherein the drone body is provided with the drone folding antenna.

8. A drone launch structure, characterized in that, The device includes a launch tube and a drone as described in claim 7, wherein the antenna assembly of the drone has a folded-down position, and when the antenna assembly is in the folded-down position, the drone is positioned inside the launch tube for launching.

9. The UAV launch structure according to claim 8, characterized in that: The inner wall of the launch tube is provided with multiple launch tube rollers. The rotation axis of the launch tube rollers is perpendicular to the launch direction of the UAV. The multiple launch tube rollers are arranged sequentially on the inner wall of the launch tube along the launch direction of the UAV. The multiple launch tube rollers arranged along the launch direction of the UAV form a launch tube roller group. Multiple groups of launch tube roller groups are provided inside the launch tube to set the distance between the UAV and the inner wall of the launch tube. The tangent direction of each launch tube roller at the contact point with the UAV is parallel to the launch direction of the UAV. The launch tube rollers are used to support and carry the UAV. There is a placement gap between two adjacent groups of launch tube rollers for placing the antenna assembly.

10. The UAV launch structure according to claim 9, characterized in that: The UAV launch structure also includes an auxiliary slider, which is located between the antenna assembly and the inner wall of the launch tube. The auxiliary slider has a blocking surface that is in contact with the antenna assembly and is located on the movement trajectory of the antenna assembly. The auxiliary slider also has a sliding surface that is in contact with the inner wall of the launch tube, and the ends of the sliding surface are all raised in a direction away from the inner wall of the launch tube.

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