Antenna and unmanned aerial vehicle

Abstract

The embodiment of the utility model relates to the technical field of wireless communication, and particularly discloses an antenna and an unmanned aerial vehicle, the antenna comprises a shell, two radiating elements and a radio frequency cable, the two radiating elements are oppositely fixed in the shell, an outer conductor of a first end of the radio frequency cable is connected to one radiating element, and an outer conductor of a second end of the radio frequency cable is connected to the other radiating element. The inner conductor of the first end of the radio frequency cable is connected to the other radiating element, the second end of the radio frequency cable extends out of the shell, and the radiating elements are provided with hollow holes. Through the above mode, the radiation element provided by the embodiment of the utility model is provided with the hollow holes to reduce the weight, so that the antenna is lightened to change the inherent frequency of the antenna, the vibration frequency of a motor is avoided, and resonance is not generated, thereby avoiding the condition that the housing is easy to generate fatigue fracture.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of wireless communication, and in particular to an antenna and an unmanned aerial vehicle. Background Art

[0002] Unmanned aerial vehicles generally fly by using motors to drive propellers. They are equipped with antennas to achieve wireless connection with controllers, so that the unmanned aerial vehicle can be controlled by the controller. Due to the limited space of the unmanned aerial vehicle, the antenna is fixed under the motor.

[0003] In the prior art, in order to make the antenna lightweight, the reflective surface is laminated with carbon fiber woven cloth to achieve a lightweight design of the antenna, but this will increase the cost of the antenna, and when the unmanned aerial vehicle is flying, the motor will vibrate. The vibration of the motor is within a frequency band. When the vibration frequency of the motor is the same as the natural frequency of the antenna, resonance will occur, which will cause the shell of the antenna connected to the motor to easily fatigue and fracture. Utility Model Content

[0004] The main technical problem solved by the utility model is to provide an antenna and an unmanned aerial vehicle, in which the radiation element is provided with hollow holes to reduce weight, so that the antenna is lightweight and the natural frequency of the antenna is changed, avoiding the vibration frequency of the motor without resonance, thereby avoiding the situation where the shell is prone to fatigue fracture.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide an antenna, including a shell, two radiating elements and a radio frequency cable, the two radiating elements are relatively fixed in the shell, the outer conductor of the first end of the radio frequency cable is connected to one of the radiating elements, the inner conductor of the first end of the radio frequency cable is connected to the other radiating element, the second end of the radio frequency cable extends from the shell, and the radiating element is provided with a hollow hole.

[0006] Optionally, the radiation element includes an outer radiation kit, a radiation ring body, an inner radiation kit and a conical cover, wherein the radiation ring body is sleeved on a first end of the inner radiation kit, the first end of the outer radiation kit is sleeved on the radiation ring body, and the conical cover is fixed to a second end of the inner radiation kit.

[0007] The conical covers, inner radiation kit, radiation ring body, outer radiation kit and radio frequency cable of the two radiation elements together constitute an antenna unit for the first frequency band;

[0008] The conical covers of the two radiating elements and the radio frequency cable together constitute an antenna unit for a second frequency band, and the frequency ranges of the first frequency band and the second frequency band are different.

[0009] Optionally, the hollow holes include a first hollow hole, a second hollow hole and a third hollow hole, the first hollow hole is arranged in the outer radiation kit, the second hollow hole is arranged in the radiation ring body, the third hollow hole is arranged in the inner radiation kit, the conical cover is provided with a connecting hole, and the first end of the RF cable passes through the connecting hole of the conical cover of one of the radiation elements and is then plugged into the connecting hole of the conical cover of another radiation element.

[0010] Optionally, a diameter of the third hollow hole does not exceed one eighth of the wavelength of the highest frequency in the second frequency band.

[0011] Optionally, the antenna further includes two guide sleeves, one of the guide sleeves being inserted into a connecting hole of a conical cover of the radiating element, the guide sleeve being provided with a through hole, the first end of the RF cable passing through the through hole of one guide sleeve and then being inserted into the through hole of the other guide sleeve, the outer conductor of the first end of the RF cable being connected to one guide sleeve, and the inner conductor of the first end of the RF cable being connected to the other guide sleeve.

[0012] Optionally, the guide sleeve includes a guide rod and a guide cap, the first end of the guide rod is fixed to the guide cap, the through hole passes through the guide rod and the guide cap, the second end of the guide rod is inserted into the connecting hole, and the guide cap abuts against the surface of the conical cover facing away from the inner radiation sleeve.

[0013] Optionally, the central axes of the outer radiation kit and the inner radiation kit are collinear, the hollow holes further include a fourth hollow hole and a fifth hollow hole, the fourth hollow hole is arranged in the outer radiation kit, the fifth hollow hole is arranged in the inner radiation kit, and the line connecting the centers of the fourth hollow hole and the fifth hollow hole passes through the central axis.

[0014] Optionally, the inner radiation kit comprises a plurality of inner radiation sub-kits and a plurality of annular cones, the plurality of inner radiation sub-kits are stacked in sequence, the cross-sectional area of ​​the inner radiation sub-kits gradually decreases along the stacking direction of the plurality of inner radiation sub-kits, and any two adjacent inner radiation sub-kits are connected by one of the annular cones;

[0015] The radiation ring body is sleeved on the first end of the inner radiation sub-assembly with the largest cross section, and the conical cover is fixed to the inner radiation sub-assembly with the smallest cross section.

[0016] Optionally, the sum of the axial lengths of the external radiation kit, the radiation ring body, the internal radiation kit and the conical cover is greater than or equal to one eighth of the wavelength of the center frequency of the first frequency band and less than or equal to three quarters of the wavelength of the center frequency of the first frequency band;

[0017] An axial length of the conical cover is greater than or equal to one eighth of a wavelength of a center frequency of the second frequency band and less than or equal to three quarters of a wavelength of a center frequency of the first frequency band.

[0018] Optionally, the antenna includes an insulating sleeve, and the conical covers of the two radiating elements are respectively plugged into and fixed at two ends of the insulating sleeve.

[0019] Optionally, the insulating sleeve includes a first insulating cone sleeve, a connecting tube and a second insulating cone sleeve, both ends of the connecting tube are respectively connected to the first insulating cone sleeve and the second insulating cone sleeve, the conical cover of one of the radiation elements is inserted into the first insulating cone sleeve, and the conical cover of the other radiation element is inserted into the second insulating cone sleeve.

[0020] Optionally, the outer wall of the connecting tube is provided with a first reinforcing rib.

[0021] Optionally, the shell includes a bottom shell and an upper cover, the bottom shell is provided with a receiving groove, the two radiation elements are arranged in the receiving groove, the upper cover is detachably arranged on the bottom shell, and the upper cover covers a notch of the receiving groove, and the second end of the radio frequency cable extends from the upper cover.

[0022] Optionally, the bottom shell includes a bottom shell body and an annular member, the bottom shell body is provided with the receiving groove, the annular member is arranged on the outer wall of the bottom shell body, and the annular member is arranged around the bottom shell body, the annular member is close to the notch of the receiving groove, the upper cover covers the notch of the receiving groove, and the upper cover and the annular member are detachably fixed.

[0023] Optionally, the upper cover is provided with a surrounding groove, and the bottom shell body is inserted into the surrounding groove at a first end of a notch of the receiving groove.

[0024] In order to solve the above technical problems, another technical solution adopted by the utility model is: to provide an unmanned aerial vehicle, including a fuselage, a fuselage arm, blades, a communication unit, a control unit, a motor and the above-mentioned antenna, the fuselage arm and the shelf are both arranged on the fuselage, the motor is arranged on the fuselage arm, the blades are arranged on the motor, the communication unit is arranged on the motor, the antenna is fixed to the motor, the antenna is a dual-frequency antenna, the control unit is arranged on the fuselage, and the control unit is respectively connected to the communication unit, the motor and the antenna.

[0025] In an embodiment of the utility model, the antenna includes a shell, two radiating elements and a radio frequency cable, wherein the two radiating elements are relatively fixed in the shell, the outer conductor of the first end of the radio frequency cable is connected to one of the radiating elements, the inner conductor of the first end of the radio frequency cable is connected to the other radiating element, the second end of the radio frequency cable extends from the shell, and the radiating element is provided with a hollow hole. The radiating element is provided with a hollow hole to reduce weight, so that the antenna is lightweight and the natural frequency of the antenna is changed, avoiding the vibration frequency of the motor without resonance, thereby avoiding the situation where the shell is prone to fatigue fracture. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0027] Figure 1 It is a three-dimensional structural schematic diagram of the antenna of an embodiment of the utility model;

[0028] Figure 2 It is a schematic exploded view of the three-dimensional structure of the antenna of the embodiment of the utility model;

[0029] Figure 3 It is a schematic diagram of the three-dimensional structure of the upper cover of the shell of the antenna of the embodiment of the utility model;

[0030] Figure 4 It is a schematic diagram of the three-dimensional structure of a radiating element of the antenna according to an embodiment of the utility model;

[0031] Figure 5 is a schematic diagram of the three-dimensional structure of another radiating element of the antenna according to an embodiment of the utility model;

[0032] Figure 6 is a schematic diagram of a three-dimensional structure of another radiating element of the antenna of an embodiment of the utility model;

[0033] Figure 7 It is a three-dimensional structural schematic diagram of an insulating sleeve of an antenna according to an embodiment of the utility model;

[0034] Figure 8 It is a three-dimensional structural schematic diagram of the guide sleeve of the antenna of the embodiment of the utility model;

[0035] Fig. 9 It is a three-dimensional structural schematic diagram of a radio frequency cable of an antenna according to an embodiment of the utility model;

[0036] Fig.10It is an S (Scatter) parameter diagram of the antenna of the embodiment of the utility model;

[0037] Fig.11 is the directional diagram of the antenna in the first frequency band of the embodiment of the utility model;

[0038] Fig.12 is the directional diagram of the antenna in the second frequency band of the embodiment of the utility model;

[0039] Fig.13 It is a three-dimensional structural schematic diagram of an unmanned aerial vehicle according to an embodiment of the utility model;

[0040] Fig.14 It is a schematic diagram of the connection between the control unit, the communication unit, the motor and the antenna of the unmanned aerial vehicle in an embodiment of the utility model.

[0041] Description of reference numerals:

[0042] 100. Antenna;

[0043] 1. Shell; 11. Bottom shell; 111. Bottom shell body; 1111. Receiving groove; 112. Ring member; 12. Upper cover; 121. Connecting member; 1211. Ring groove; 1212. Second reinforcing rib; 122. Bearing member; 1221. Communication groove; 1222. Through hole; 1223. Mounting hole; 1224. Third reinforcing rib; 13. Sealing member;

[0044] 2. Radiating element; 21. External radiating kit; 22. Radiating ring body; 23. Internal radiating kit; 231. Internal radiating sub-kit; 232. Ring cone; 24. Conical cover; 241. Connecting hole; 251. First hollow hole; 252. Second hollow hole; 253. Third hollow hole; 254. Fourth hollow hole; 255. Fifth hollow hole;

[0045] 3. Insulating sleeve; 31. First insulating cone sleeve; 32. Connecting tube; 321. First reinforcing rib; 322. Hollow opening; 33. Second insulating cone sleeve;

[0046] 4. guide sleeve; 41. guide rod; 411. first rod body; 412. second rod body; 42. guide cap; 43. through hole;

[0047] 5. RF cable; 51. inner conductor; 52. first insulating layer; 53. outer conductor; 54. second insulating layer;

[0048] 100, unmanned aerial vehicle; 200, fuselage; 300, arm; 400, propeller blade; 500, communication unit; 600, control unit; 700, motor. DETAILED DESCRIPTION

[0049] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "locked to" another element, it can be directly on the other element, or there can be one or more centered elements between them. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements between them. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0050] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0051] See also Figure 1 and Figure 2 The antenna 100 includes a shell 1, two radiating elements 2, an insulating sleeve 3, two guide sleeves 4 and a radio frequency cable 5. The two radiating elements 2 are relatively fixed in the shell 1. The insulating sleeve 3 is fixed in the shell 1, and the two radiating elements 2 are respectively plugged and fixed at both ends of the insulating sleeve 3. A guide sleeve 4 is plugged into a radiating element 2. The first end of the radio frequency cable 5 is connected to the two guide sleeves 4, so that the first end of the radio frequency cable 5 is connected to a radiating element 2 through a guide sleeve 4, and the second end of the radio frequency cable 5 extends from the shell 1. The two partial radiating elements 2, the radio frequency cable 5 and the two guide sleeves 4 together constitute an antenna 100 unit for a first frequency band. The two partial radiating elements 2, the radio frequency cable 5 and the two guide sleeves 4 together constitute an antenna 100 unit for a second frequency band, and the first frequency band and the second frequency band are different. The radiating element 2 is connected to the radio frequency cable 5 through the guide sleeve 4, which solves the problem of difficulty in connecting the radiating element 2 and the radio frequency cable 5.

[0052] For the above case 1, see Figure 2 and Figure 3 The housing 1 includes a bottom shell 11 and an upper cover 12. The bottom shell 11 is used to accommodate two radiation elements 2 and an insulating sleeve 3. The upper cover 12 is detachably disposed on the bottom shell 11, and the second end of the radio frequency cable 5 extends from the upper cover 12.

[0053] The bottom shell 11 includes a bottom shell body 111 and an annular member 112. The bottom shell body 111 is provided with a receiving groove 1111 for the two radiating elements 2 and the insulating sleeve 3 to be placed and fixed. In some embodiments, the two radiating elements 2 and the insulating sleeve 3 are fixed to the wall surface of the receiving groove 1111 by means of glue or other bonding methods to prevent the two radiating elements 2 and the insulating sleeve 3 from shaking, which not only ensures the reliability of the antenna 100, but also does not require an additional fixing structure to fix the two radiating elements 2 and the insulating sleeve 3 in the receiving groove 1111, thereby making the antenna 100 lightweight. The annular member 112 is arranged on the outer wall of the bottom shell body 111, and the annular member 112 is arranged around the bottom shell body 111, and the annular member 112 is close to the notch of the receiving groove 1111, that is, the annular member 112 is arranged at the first end of the bottom shell 11.

[0054] The upper cover 12 covers the notch of the receiving groove 1111, and the upper cover 12 and the annular member 112 are detachably fixed. The upper cover 12 includes a connecting member 121 and a bearing member 122. The connecting member 121 is connected to the first end of the bearing member 122 close to the bottom shell body 111. The connecting member 121 is provided with an annular groove 1211 and a second reinforcing rib 1212. The first end of the notch of the bottom shell body 111 at the receiving groove 1111 is inserted into the annular groove 1211. The first end of the second reinforcing rib 1212 is connected to the first end of the bearing member 122 close to the bottom shell body 111, and the second reinforcing rib 1212 is used to increase the strength. The bearing member 122 is provided with a connecting groove 1221, a through hole 1222 and a mounting hole 1223. The connecting groove 1221 is connected to the receiving groove 1111, and the wall surface of the connecting groove 1221 and the groove bottom of the connecting groove 1221 are provided with a third reinforcing rib 1224, and the third reinforcing rib 1224 is used to increase the strength. The through hole 1222 is provided at the second end of the carrier 122 away from the bottom shell body 111, and the through hole 1222 is connected to the connecting groove 1221, so that the second end of the RF cable 5 extends out from the upper cover 12 after passing through the connecting groove 1221 and the through hole 1222. The mounting hole 1223 is provided at the second end of the carrier 122 away from the bottom shell body 111, and the mounting hole 1223 is connected to the connecting groove 1221. The mounting hole 1223 is used to fix the upper cover 12 to the motor 700 of the unmanned aerial vehicle, so that the antenna 100 is fixed to the motor 700, and the antenna 100 is located below the motor 700.

[0055] In order to prevent foreign matter such as moisture from entering the receiving groove 1111 from the gap between the connecting piece 121 and the bottom shell body 111 and affecting the performance of the antenna 100, the bottom shell 11 also includes a sealing member 13, which is received in the annular groove 1211. The sealing member 13 is squeezed and deformed by the first end of the notch of the bottom shell body 111 in the receiving groove 1111 and the bottom of the annular groove 1211, thereby sealing the gap between the first end of the notch of the bottom shell body 111 in the receiving groove 1111 and the wall surface of the annular groove 1211 and the bottom of the annular groove 1211.

[0056] For the above radiating element 2, see Figure 4-Figure 6 , the radiation element 2 is made of metal material, but is not limited to this. The radiation element 2 can also be made of non-metallic material plus electroplated metal film, for example, it is made of plastic plus electroplated metal film. The radiation element 2 includes an outer radiation kit 21, a radiation ring body 22, an inner radiation kit 23 and a conical cover 24. The radiation ring body 22 is sleeved on the first end of the inner radiation kit 23. The first end of the outer radiation kit 21 is sleeved on the radiation ring body 22. The conical cover 24 is fixed to the second end of the inner radiation kit 23. The second end of the outer radiation kit 21 faces the conical cover 24, that is, it is bent twice from the conical cover 24 through the inner radiation kit 23 and the radiation ring body 22 to the outer radiation kit 21. The radiation element 2 is provided with hollow holes, which are respectively arranged in the outer radiation kit 21, the radiation ring body 22 and the inner radiation kit 23. The hollow holes are used to reduce the weight of the radiation element 2, thereby making the antenna 100 lightweight. Since the natural frequency of an object is related to its mass, the lightweight antenna 100 changes the natural frequency of the antenna 100, thereby avoiding the vibration frequency of the motor 700 without generating resonance, thereby preventing the shell 1 from being prone to fatigue fracture.

[0057] Along the direction from the first end to the second end of the inner radiation set 23 , the cross-sectional area of ​​the inner radiation set 23 is the same.

[0058] It is understandable that, in some embodiments, the structure of the inner radiation kit 23 is not limited to the above structure, and the structure of the inner radiation kit 23 can also be other structures, for example, the inner radiation kit 23 includes a plurality of inner radiation sub-kits 231 and a plurality of annular cones 232, the plurality of inner radiation sub-kits 231 are stacked in sequence, and the cross-sectional area of ​​the inner radiation sub-kits 231 gradually decreases along the stacking direction of the plurality of inner radiation sub-kits 231, and any adjacent inner radiation sub-kits 231 are connected by an annular cone 232, the radiation ring body 22 is sleeved on the first end of the inner radiation sub-kit 231 with the largest cross section, and the conical cover 24 is fixed to the inner radiation sub-kit 231 with the smallest cross section. The inner radiation kit 23 including a plurality of inner radiation sub-kits 231 and a plurality of annular cones 232 enables the antenna 100 to achieve more frequency bands.

[0059] The conical cover 24 is provided with a connecting hole 241 , and the connecting hole 241 is for the guide sleeve 4 to be plugged in.

[0060] The conical cover 24, the inner radiation kit 23, the radiation ring body 22, the outer radiation kit 21, the RF cable 5 and the two guide sleeves 4 of the two radiation elements 2 together constitute an antenna 100 unit for the first frequency band. It should be noted that the frequency of the first frequency band is greater than or equal to 0.88 GHz and less than or equal to 2.33 GHz. The method of bending twice from the conical cover 24 through the inner radiation kit 23 and the radiation ring body 22 to the outer radiation kit 21 can adjust the frequency resonance point to the first frequency band within a shorter axial length.

[0061] Further, the sum of the axial lengths of the outer radiation kit 21, the radiation ring body 22, the inner radiation kit 23 and the conical cover 24 is greater than or equal to one eighth of the center frequency wavelength of the first frequency band and less than or equal to three quarters of the center frequency wavelength of the first frequency band. Specifically, based on the center frequency of the first frequency band of 1.605 GHz, the sum of the axial lengths of the outer radiation kit 21, the radiation ring body 22, the inner radiation kit 23 and the conical cover 24 is greater than or equal to 23.36 mm and less than or equal to 140.18 mm.

[0062] The conical covers 24 of the two radiating elements 2, the RF cables 5 and the two guide sleeves 4 together constitute an antenna 100 unit for the second frequency band. The axial length of the conical cover 24 is greater than or equal to one eighth of the wavelength of the center frequency of the second frequency band and less than or equal to three quarters of the wavelength of the center frequency of the first frequency band. It should be noted that the frequency of the second frequency band is greater than or equal to 4.29 GHz and less than or equal to 5.66 GHz. The conical surface of the conical cover 24 enables the second frequency band to obtain a wider bandwidth.

[0063] Further, the axial length of the conical cover 24 is greater than or equal to one eighth of the wavelength of the center frequency of the second frequency band and less than or equal to three quarters of the wavelength of the center frequency of the first frequency band. Specifically, based on the center frequency of the second frequency band of 4.975 GHz, the axial length of the conical cover 24 is greater than or equal to 7.53 mm and less than or equal to 45.22 mm.

[0064] In some embodiments, along the direction from the radiation ring body 22 to the conical cover 24, the cross section of the radiation element 2 is circular, that is, along the direction from the outer radiation kit 21 to the conical cover 24, the cross sections of the outer radiation kit 21, the radiation ring body 22, the inner radiation ring body 22 and the conical cover 24 are all in the shape of a circular ring, that is, the conical cover 24 is in the shape of a cone as a whole, so that the omnidirectionality of the H plane of the antenna 100 unit in the first frequency band is better. Furthermore, the conical cover 24 with a circular cross section along the direction from the radiation ring body 22 to the conical cover 24 makes the omnidirectionality of the H plane of the antenna 100 unit in the second frequency band better. Furthermore, along the direction from the radiation ring body 22 to the conical cover 24, the cross section of the radiation element 2 is polygonal, that is, along the direction from the outer radiation kit 21 to the conical cover 24, the cross sections of the outer radiation kit 21, the radiation ring body 22, the inner radiation ring body 22 and the conical cover 24 are all in the shape of a polygon, that is, the conical cover 24 is in the shape of a pyramid as a whole.

[0065] The hollow holes include a first hollow hole 251, a second hollow hole 252, and a third hollow hole 253. The first hollow hole 251 is provided in the outer radiation kit 21, so that the outer radiation kit 21 is reduced in weight. The second hollow hole 252 is provided in the radiation ring body 22, so that the radiation ring body 22 is reduced in weight. The third hollow hole 253 is provided in the inner radiation kit 23, so that the inner radiation kit 23 is reduced in weight. Specifically, the first hollow hole 251, the second hollow hole 252, and the third hollow hole 253 reduce the weight of the radiation element 2, thereby making the antenna 100 lightweight.

[0066] Furthermore, the hollow holes also include a fourth hollow hole 254 and a fifth hollow hole 255. The fourth hollow hole 254 is arranged in the outer radiation kit 21, so that the outer radiation kit 21 is further reduced in weight. The fifth hollow hole 255 is arranged in the inner radiation kit 23, so that the inner radiation kit 23 is further reduced in weight. Specifically, the fourth hollow hole 254 and the fifth hollow hole 255 further reduce the weight of the radiation element 2, thereby making the antenna 100 more lightweight. In order to facilitate production and processing, the central axes of the outer radiation kit 21 and the inner radiation kit 23 are collinear, and the line connecting the centers of the fourth hollow hole 254 and the fifth hollow hole 255 passes through the central axis, that is, the fifth hollow hole 255 is arranged at the first end of the inner radiation kit 23.

[0067] In some embodiments, the shapes of the first hollow hole 251, the second hollow hole 252, the third hollow hole 253, the fourth hollow hole 254 and the fifth hollow hole 255 are all circular. The diameter of the circular third hollow hole 253 does not exceed one eighth of the wavelength of the highest frequency in the second frequency band, ensuring the performance of the directional pattern of the second frequency band. However, the shapes of the first hollow hole 251, the second hollow hole 252, the third hollow hole 253, the fourth hollow hole 254 and the fifth hollow hole 255 are not limited thereto, and the shapes of the first hollow hole 251, the second hollow hole 252, the third hollow hole 253, the fourth hollow hole 254 and the fifth hollow hole 255 may also be other shapes, for example, polygonal.

[0068] For the above insulating sleeve 3, please refer to Figure 7 , the insulating sleeve 3 includes a first insulating cone sleeve 31, a connecting tube 32 and a second insulating cone sleeve 33. The two ends of the connecting tube 32 are connected to the first insulating cone sleeve 31 and the second insulating cone sleeve 33 respectively. The conical cover 24 of one radiating element 2 is plugged into the first insulating cone sleeve 31. The conical cover 24 of another radiating element 2 is plugged into the second insulating cone sleeve 33. In some embodiments, the conical cover 24 of the radiating element 2 is plugged and fixed to the first insulating cone sleeve 31 by a bonding method such as glue. The conical cover 24 of another radiating element 2 is plugged and fixed to the second insulating cone sleeve 33 by a bonding method such as glue, further avoiding the shaking of the two radiating elements 2 and the insulating sleeve 3, not only ensuring the reliability of the antenna 100, but also not requiring an additional fixing structure to fix the two radiating elements 2 and the insulating sleeve 3, thereby further making the antenna 100 lightweight. The connecting tube 32 is provided with a first reinforcing rib 321 and a hollow opening 322. The hollow opening 322 further makes the antenna 100 lightweight. The first reinforcing rib 321 is disposed on the outer wall surface of the connecting tube 32 , and is disposed to increase the strength of the connecting tube 32 .

[0069] For the guide bushing 4 above, see Figure 8 The guide sleeve 4 includes a guide rod 41 and a guide cap 42. The first end of the guide rod 41 is fixed to the guide sleeve 4, and the second end of the guide rod 41 is plugged into the connection hole 241. The guide cap 42 abuts against the surface of the conical cover 24 away from the inner radiation set 23. The guide sleeve 4 is provided with a through hole 43, and the through hole 43 passes through the guide rod 41 and the guide cap 42. The first end of the RF cable 5 is respectively plugged into the through hole 43 of one guide sleeve 4 and then inserted into the through hole 43 of another guide sleeve 4 after passing through the through hole 43 of one guide sleeve 4.

[0070] The guide rod 41 includes a first rod body 411 and a second rod body 412. The first rod body 411 is inserted into the connection hole 241, the first end of the first rod body 411 is connected to the guide cap 42, and the second end of the first rod body 411 is connected to the second rod body 412. Along the direction from the first rod body 411 to the second rod body 412, the area of ​​the cross section of the first rod body 411 is larger than the area of ​​the cross section of the connection hole 241, so that the first rod body 411 is fixed to the connection hole 241. Along the direction from the first rod body 411 to the second rod body 412, the area of ​​the cross section of the first rod body 411 is larger than the area of ​​the cross section of the second rod body 412, so that the first rod body 411 is inserted into the connection hole 241 under the guidance of the second rod body 412. A guiding inclined surface is provided at the connection between the first rod body 411 and the second rod body 412, and the guiding inclined surface is used for guiding.

[0071] For the above RF cables 5, see Fig. 9 , the RF cable 5 includes an inner conductor 51, a first insulating layer 52, an outer conductor 53 and a second insulating layer 54. The first insulating layer 52 wraps the inner conductor 51, and the first end of the inner conductor 51 extends out of the first insulating layer 52 and is plugged into the through hole 43 of a guide sleeve 4. The first end of the inner conductor 51 passes through the through hole 43 of one guide sleeve 4 and the through hole 43 of another guide sleeve 4 in sequence, and the second end of the inner conductor 51 passes through the through hole 1222 and then extends out of the housing 1. In some embodiments, the inner conductor 51 is plugged into the through hole 43 of a guide sleeve 4 by welding, and the guide sleeve 4 is plugged into the connection hole 241 of a radiation element 2, thereby solving the problem of welding the inner conductor 51 to the conical cover 24 of a radiation element 2 due to the fast heat dissipation area of ​​the radiation element 2, which makes welding difficult. The first end of the first insulating layer 52 passes through the through hole 43 of another guide sleeve 4, and the second end of the first insulating layer 52 passes through the through hole 1222 and then extends out of the housing 1. The outer conductor 53 wraps the first insulating layer 52, and the second insulating layer 54 wraps the outer conductor 53. The first end of the outer conductor 53 extends out of the second insulating layer 54 and is inserted into the through hole 43 of another guide sleeve 4. The first end of the outer conductor 53 passes through the through hole 43 of another guide sleeve 4, and the second end of the outer conductor 53 passes through the through hole 1222 and then extends out of the housing 1. In some embodiments, the outer conductor 53 is inserted into the through hole 43 of another guide sleeve 4 by welding, and the other guide sleeve 4 is inserted into the connection hole 241 of another radiation element 2, thereby solving the problem of welding the outer conductor 53 to the conical cover 24 of another radiation element 2 due to the fast heat dissipation area of ​​the radiation element 2, which makes welding difficult. The first end of the second insulating layer 54 is located in the receiving groove 1111 of the housing 1, and the second end of the second insulating layer 54 passes through the through hole 1222 and then extends out of the housing 1.

[0072] In order to help readers better understand the performance of the antenna 100 of the present invention, the following experiments are conducted to prove that:

[0073] 1) For the first frequency band, the antenna 100 comprises the conical cover 24 of the two radiation elements 2, the inner radiation set 23, the radiation ring body 22, the outer radiation set 21, the radio frequency cable 5 and the two guide sleeves 4 to form the antenna 100 unit for the first frequency band. Fig.10 As shown, the antenna 100 has good circuit performance for electromagnetic signals in the frequency band of 0.88 GHz to 2.33 GHz, and at the same time Fig.11 It can be seen that, on the H plane, the antenna 100 has good omnidirectionality in radiating electromagnetic signals in the first frequency band.

[0074] 2) For the second frequency band, the antenna 100 is composed of the conical covers 24 of the two radiation elements 2, the radio frequency cable 5 and the two guide sleeves 4 to form an antenna 100 unit for the second frequency band. Figure 6 As shown, the antenna 100 has good circuit performance for electromagnetic signals in the frequency band of 4.29 GHz to 5.66 GHz, and at the same time Fig.12 It can be seen that, on the H plane, the antenna 100 has good omnidirectionality in radiating electromagnetic signals in the second frequency band.

[0075] In the embodiment of the utility model, the antenna 100 includes a housing 1, two radiating elements 2 and a radio frequency cable 5, the two radiating elements 2 are relatively fixed in the housing 1, the outer conductor 53 of the first end of the radio frequency cable 5 is connected to one radiating element 2, the inner conductor 51 of the first end of the radio frequency cable 5 is connected to the other radiating element 2, the second end of the radio frequency cable 5 extends from the housing 1, and the radiating element 2 is provided with a hollow hole. The radiating element 2 is provided with a hollow hole to reduce weight, so that the antenna 100 is lightweight and the natural frequency of the antenna 100 is changed, avoiding the vibration frequency of the motor 700 without resonance, thereby avoiding the housing 1 from being prone to fatigue fracture.

[0076] The utility model also provides an unmanned aerial vehicle 1000 embodiment, see Fig.13 and Fig.14 The unmanned aerial vehicle 1000 includes a fuselage 200, an arm 300, a blade 400, a communication unit 500, a control unit 600, a motor 700 and the above-mentioned antenna 100. The arm 300 is arranged on the fuselage 200, the motor 700 is arranged on the arm 300, the blade 400 is arranged on the motor 700, the communication unit 500 is arranged on the motor 700, the mounting hole 1223 of the upper cover 12 of the shell 1 of the antenna 100 is fixed to the motor 700 by bolts, so that the antenna 100 is fixed to the motor 700, the antenna 100 is a dual-frequency antenna, the control unit 600 is arranged on the fuselage 200, and the control unit 600 is respectively connected to the communication unit 500, the motor 700 and the antenna 100. For the structure and function of the antenna 100, please refer to the above-mentioned embodiment, which will not be repeated here.

[0077] It should be noted that the preferred embodiments of the utility model are given in the specification and drawings of the utility model, but the utility model can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not used as additional restrictions on the content of the utility model. The purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the utility model; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the utility model.

Claims

1. An antenna, comprising: case; Two radiation elements are relatively fixed in the housing; A radio frequency cable, wherein an outer conductor of a first end of the radio frequency cable is connected to a first radiating element, an inner conductor of the first end of the radio frequency cable is connected to a second radiating element, and a second end of the radio frequency cable extends from the housing; Characterized in that the radiation element is provided with a hollow hole.

2. The antenna according to claim 1, characterized in that The radiation element comprises an outer radiation set, a radiation ring body, an inner radiation set and a conical cover, wherein the radiation ring body is sleeved on a first end of the inner radiation set, the first end of the outer radiation set is sleeved on the radiation ring body, and the conical cover is fixed to a second end of the inner radiation set; The conical covers, inner radiation kit, radiation ring body, outer radiation kit and radio frequency cable of the two radiation elements together constitute an antenna unit for the first frequency band; The conical covers of the two radiating elements and the radio frequency cable together constitute an antenna unit for a second frequency band, and the frequency ranges of the first frequency band and the second frequency band are different.

3. The antenna according to claim 2, characterized in that: The hollow holes include a first hollow hole, a second hollow hole and a third hollow hole, the first hollow hole is arranged in the outer radiation kit, the second hollow hole is arranged in the radiation ring body, and the third hollow hole is arranged in the inner radiation kit. The conical cover is provided with a connecting hole, and the first end of the RF cable passes through the connecting hole of the conical cover of one of the radiation elements and is then plugged into the connecting hole of the conical cover of another radiation element.

4. The antenna according to claim 3, characterized in that: The diameter of the third hollow hole does not exceed one eighth of the wavelength of the highest frequency in the second frequency band.

5. The antenna according to claim 3, characterized in that: The antenna also includes two guide sleeves, one of the guide sleeves is inserted into the connecting hole of the conical cover of the radiation element, the guide sleeve is provided with a through hole, the first end of the RF cable passes through the through hole of one guide sleeve and is inserted into the through hole of the other guide sleeve, the outer conductor of the first end of the RF cable is connected to one guide sleeve, and the inner conductor of the first end of the RF cable is connected to the other guide sleeve.

6. The antenna according to claim 5, characterized in that The guide sleeve includes a guide rod and a guide cap, the first end of the guide rod is fixed to the guide cap, the through hole passes through the guide rod and the guide cap, the second end of the guide rod is inserted into the connecting hole, and the guide cap abuts against the surface of the conical cover away from the inner radiation sleeve.

7. The antenna according to claim 3, characterized in that: The central axes of the outer radiation kit and the inner radiation kit are collinear, and the hollow holes further include a fourth hollow hole and a fifth hollow hole, the fourth hollow hole is arranged in the outer radiation kit, and the fifth hollow hole is arranged in the inner radiation kit, and the line connecting the centers of the fourth hollow hole and the fifth hollow hole passes through the central axis.

8. The antenna according to claim 3, characterized in that: The inner radiation kit comprises a plurality of inner radiation sub-kits and a plurality of annular cones, wherein the plurality of inner radiation sub-kits are stacked in sequence, and along the stacking direction of the plurality of inner radiation sub-kits, the cross-sectional area of ​​the inner radiation sub-kits gradually decreases, and any two adjacent inner radiation sub-kits are connected by one of the annular cones; The radiation ring body is sleeved on the first end of the inner radiation sub-assembly with the largest cross section, and the conical cover is fixed to the inner radiation sub-assembly with the smallest cross section.

9. The antenna according to claim 3, characterized in that: The sum of the axial lengths of the outer radiation kit, the radiation ring body, the inner radiation kit and the conical cover is greater than or equal to one eighth of the wavelength of the center frequency of the first frequency band and less than or equal to three quarters of the wavelength of the center frequency of the first frequency band; An axial length of the conical cover is greater than or equal to one eighth of a wavelength of a center frequency of the second frequency band and less than or equal to three quarters of a wavelength of a center frequency of the first frequency band.

10. The antenna according to any one of claims 1 to 9, characterized in that: The antenna comprises an insulating sleeve, and the conical covers of the two radiation elements are respectively plugged into and fixed at two ends of the insulating sleeve.

11. The antenna according to claim 10, characterized in that: The insulating sleeve includes a first insulating cone sleeve, a connecting tube and a second insulating cone sleeve, the two ends of the connecting tube are respectively connected to the first insulating cone sleeve and the second insulating cone sleeve, the conical cover of one of the radiation elements is plugged into the first insulating cone sleeve, and the conical cover of the other radiation element is plugged into the second insulating cone sleeve.

12. The antenna according to claim 11, characterized in that The outer wall of the connecting tube is provided with a first reinforcing rib.

13. The antenna according to any one of claims 1 to 9, characterized in that: The shell includes a bottom shell and an upper cover, the bottom shell is provided with a receiving groove, the two radiation elements are arranged in the receiving groove, the upper cover is detachably arranged on the bottom shell, and the upper cover covers the notch of the receiving groove, and the second end of the radio frequency cable extends from the upper cover.

14. The antenna according to claim 13, characterized in that The bottom shell includes a bottom shell body and an annular component, the bottom shell body is provided with the receiving groove, the annular component is arranged on the outer wall of the bottom shell body, and the annular component is arranged around the bottom shell body, the annular component is close to the notch of the receiving groove, the upper cover covers the notch of the receiving groove, and the upper cover and the annular component are detachably fixed.

15. The antenna according to claim 14, characterized in that The upper cover is provided with a surrounding groove, and the bottom shell body is inserted into the surrounding groove at a first end of the notch of the receiving groove.

16. An unmanned aerial vehicle, characterized in that: It includes a fuselage, an arm, a blade, a communication unit, a control unit, a motor, and an antenna as described in any one of claims 1 to 15, wherein the arm is arranged on the fuselage, the motor is arranged on the arm, the blade is arranged on the motor, the communication unit is arranged on the motor, the antenna is fixed to the motor, the antenna is a dual-frequency antenna, the control unit is arranged on the fuselage, and the control unit is respectively connected to the communication unit, the motor and the antenna.

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