CN210957006U

CN210957006U - Be applied to unmanned aerial vehicle's antenna and unmanned aerial vehicle

Info

Publication number: CN210957006U
Application number: CN201922497334.5U
Authority: CN
Inventors: 魏建平; 尹航
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-07-07
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a be applied to unmanned aerial vehicle's antenna and unmanned aerial vehicle. The antenna includes the base plate and sets up the radiating element of base plate, the radiating element includes first irradiator and second irradiator, the second irradiator includes first radiation piece, second radiation piece and connects first radiation piece with the switch part of second radiation piece, first radiation piece is connected first irradiator, first irradiator is used for radiating the electromagnetic wave of first frequency channel, the second irradiator is used for under the circumstances that the switch part switched on, the electromagnetic wave of radiation second frequency channel, and under the circumstances that the switch part breaks off, the electromagnetic wave of radiation third frequency channel, wherein, first frequency channel the second frequency channel reaches the third frequency channel is all inequality. The antenna realizes three-frequency coverage by utilizing the on-off of the switch piece, reduces the design size of the three-frequency antenna, and has better omnidirectional coverage of each frequency band.

Description

Be applied to unmanned aerial vehicle's antenna and unmanned aerial vehicle

Technical Field

The utility model relates to an unmanned air vehicle technique field, in particular to be applied to unmanned aerial vehicle's antenna and unmanned aerial vehicle.

Background

Along with the enhancement of unmanned aerial vehicle communication service demand, the frequency channel that can use will be more and more. For example, the frequency band used by the drone includes a plurality of frequency bands, such as three frequency bands. However, the size of the three-band antenna in the related art is large, which is not favorable for the miniaturization design of the unmanned aerial vehicle.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an embodiment provides an be applied to unmanned aerial vehicle's antenna and unmanned aerial vehicle.

The utility model discloses be applied to unmanned aerial vehicle's antenna, be in including base plate and setting the radiating element of base plate, the radiating element includes first irradiator and second irradiator, the second irradiator includes first radiant part, second radiant part and connects first radiant part with the switch part of second radiant part, first radiant part is connected first radiant part, first radiant part is used for radiating the electromagnetic wave of first frequency channel, the second radiant part is used for under the condition that the switch part switches on, radiate the electromagnetic wave of second frequency channel, and under the condition of switch part disconnection, radiate the electromagnetic wave of third frequency channel, wherein, first frequency channel the second frequency channel reaches the third frequency channel is all inequality.

The utility model discloses embodiment's antenna utilizes the break-make of switching piece to realize three frequency covers, has reduced the design size of three frequency antennas, and every frequency channel omnidirectional covers better.

In some embodiments, the antenna comprises two radiating elements, and two radiating element bodies are arranged on the substrate in a mirror image mode.

In some embodiments, the radiating element includes a connector disposed on the substrate and connecting the first radiating element and the first radiating element.

In some embodiments, the antenna includes two first radiators, two second radiators, and two connectors, and each connector connects one first radiator and one first radiator.

In some embodiments, one of the connection bodies is provided with a first feeding portion for connecting with an inner core of a coaxial line, and the other of the connection bodies is provided with a second feeding portion for connecting with an outer conductor of the coaxial line.

In some embodiments, the first radiator has a length of 19.2 ± 0.5mm and a width of 1 ± 0.2 mm; the length of the first radiation piece is 20.5 +/-0.5 mm, and the width of the first radiation piece is 1 +/-0.2 mm; the length of the second radiation piece is 61 +/-0.5 mm, and the width of the second radiation piece is 1 +/-0.2 mm.

In some embodiments, the second radiation element includes a first radiation portion, a connection portion and a second radiation portion, the first radiation portion is opposite to the second radiation portion in a spaced manner, the connection portion connects the first radiation portion and the second radiation portion, and the first radiation portion is connected to the switch element.

In some embodiments, the first radiating portion is parallel to the second radiating portion.

An embodiment of the utility model provides an unmanned aerial vehicle, its antenna that includes fuselage and any preceding embodiment, the antenna connection the fuselage.

In the unmanned aerial vehicle of the above embodiment, the on-off of the switch element of the antenna is utilized to realize three-frequency coverage, so that the design size of the three-frequency antenna is reduced, and the omnidirectional coverage of each frequency band is better.

In some embodiments, the unmanned aerial vehicle includes a signal receiver and a controller, the signal receiver is connected to the antenna, the controller is connected to the signal receiver and the switch, and the controller is configured to control the switch to be turned on or off according to the signal strength received by the signal receiver.

In certain embodiments, the unmanned aerial vehicle comprises a horn connected to the fuselage, the antenna being mounted at a distal end of the horn.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of an antenna according to an embodiment of the present invention.

Fig. 2 is a schematic size diagram of an antenna according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a coaxial line according to an embodiment of the present invention.

Fig. 4 is a schematic view of a partial structure of the unmanned aerial vehicle according to the embodiment of the present invention.

Fig. 5 is a schematic diagram of the module of the unmanned aerial vehicle according to the embodiment of the present invention.

Fig. 6 is a simulation diagram of S11 parameter of the antenna according to the embodiment of the present invention when the switch is turned on.

Fig. 7 is a simulation diagram of the S11 parameter of the antenna according to the embodiment of the present invention when the switch is turned off.

Fig. 8 is a pattern of the antenna according to the embodiment of the present invention at 840 MHz.

Fig. 9 is a pattern diagram of the antenna according to the embodiment of the present invention at 1.4 GHz.

Fig. 10 is a pattern diagram of the antenna according to the embodiment of the present invention at 2.4 GHz.

Description of the main element symbols:

the antenna comprises an antenna 100, a substrate 10, a radiating unit 20, a first radiator 22, a second radiator 24, a first radiating element 242, a second radiating element 244, a first radiating part 2442, a connecting part 2444, a second radiating part 2446, a switch 246, a connecting body 26, a first feed part 28, a second feed part 29, a coaxial line 30, an inner core 32, an outer conductor 34, an unmanned aerial vehicle 1000, a fuselage 110, a horn 120, a power assembly 130, a propeller 140, a signal receiver 150, a controller 160 and a supporting foot 170.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1 and 4, an antenna 100 applied to an unmanned aerial vehicle 1000 according to an embodiment of the present invention includes a substrate 10 and a radiation unit 20 disposed on the substrate 10. The radiation unit 20 includes a first radiator 22 and a second radiator 24. The second radiator 24 includes a first radiation element 242, a second radiation element 244, and a switch 246 connecting the first radiation element 242 and the second radiation element 244. The first radiator 242 is connected to the first radiator 22. The first radiator 22 is configured to radiate electromagnetic waves in a first frequency band. The second radiator 24 is configured to radiate electromagnetic waves of a second frequency band in a case where the switching element 246 is turned on, and radiate electromagnetic waves of a third frequency band in a case where the switching element 246 is turned off. The first frequency band, the second frequency band and the third frequency band are different.

The antenna 100 realizes triple-band coverage by switching the switch 246, reduces the design size of the triple-band antenna 100, and has good omni-directional coverage in each frequency band.

The substrate 10 of the present embodiment may support the radiation unit 20. The substrate 10 may be an FR-4 substrate, the FR-4 substrate being a composite of epoxy resin with filler and with glass fibers. The FR-4 substrate has stable electrical insulation performance, good flatness, smooth surface, no pit and standard thickness tolerance, and is suitable for being applied to the antenna 100 with high-performance electronic insulation requirements.

In the embodiment of the present invention, the radiation units 20 may be disposed on the same surface or different surfaces of the substrate 10. The radiation unit 20 may be used to radiate electromagnetic waves of different frequency bands.

In one embodiment, the first radiator 22 radiates electromagnetic waves in a first frequency band, which may be 2408 and 2440MHz, hereinafter referred to as 2.4 GHz. In the embodiment of the present invention, the second radiator 24 can radiate electromagnetic waves of different frequency bands by controlling the on/off of the switch 246. With the switching element 246 conducting, electromagnetic waves of a second frequency band, which may be 840.5-845MHz, hereinafter 840MHz, are radiated. When the switch 246 is turned off, electromagnetic waves of a third frequency band, which may be 1430 + 1444MHz, hereinafter referred to as 1.4GHz, are radiated. That is, with the switching element 246 turned on, the operating frequency band of the antenna 100 is 840MHz and 2.4 GHz. With the switching element 246 open, the operating frequency band of the antenna 100 is 1.4GHz and 2.4 GHz. Of course, in other embodiments, other frequency bands may be selected, and are not limited to the three frequency bands.

Specifically, the switching element 246 may be a PIN diode. In case the PIN diode is turned on, the PIN diode may be equivalent to a small resistance, such as a 1 ohm resistance, so that the second radiator 24 radiates electromagnetic waves of 840 MHz. In the case of an off PIN diode, the PIN diode may be equivalently connected in parallel with a 0.1pF and 3k ohm resistor, where the second radiator 24 achieves a frequency band coverage of 1.4 GHz. Of course, in other embodiments, the switch 246 may be provided as another element having an on/off function to enable the second radiator 24 to radiate electromagnetic waves of different frequency bands, and is not limited in particular.

Referring to fig. 2, in the present embodiment, the planar shape of the first radiator 22 is L-shaped. The length of the first radiator 22 is 19.2 + -0.5 mm, and the width D1 is 1 + -0.2 mm. In the example of fig. 2, the sum of L11 and L12 is the length of the first radiator 22.

The planar shape of the first radiation member 242 is L-shaped. The length of the first radiation element 242 is 20.5 + -0.5 mm, and the width D2 is 1 + -0.2 mm. In the example of fig. 2, the sum of L21 and L22 is the length of the first radiating element 242.

The planar shape of the second radiation element 244 is concave. The length of the second radiation element 244 is 61 + -0.5 mm and the width D3 is 1 + -0.2 mm. In the example of fig. 2, the sum of L4, L5, and L6 is the length of the second radiator 244.

In this way, the antenna 100 is more miniaturized by the L-shaped and concave-shaped bending design while ensuring the transmission and reception of signals by the antenna 100.

Preferably, in one embodiment, the first radiator 22 has a length of 19.2mm and a width of 1 mm. The first radiation member 242 has a length of 20.5mm and a width of 1 mm. The second radiation member 244 has a length of 61mm and a width of 1 mm.

Referring to fig. 1, in the embodiment of the present invention, the second radiation member 244 includes a first radiation portion 2442, a connection portion 2444 and a second radiation portion 2446. The first radiating portion 2442 is spaced apart from and opposed to the second radiating portion 2446. The connection portion 2444 connects the first radiation portion 2442 and the second radiation portion 2446. The first radiating portion 2442 is connected to the switching element 246. In this way, the longitudinal space occupied by the second radiation element 244 can be reduced, thereby making the antenna 100 more compact as a whole.

Specifically, the planar shapes of the first radiation portion 2442, the connection portion 2444, and the second radiation portion 2446 are all rectangular. The first and

second radiation portions

2442 and 2446 are perpendicular to the connection portion 2444, respectively. The connection portion 2444 connects one end of the first radiation portion 2442 and one end of the second radiation portion 2446, respectively.

Referring to fig. 1 and 2, in the embodiment of the invention, the first radiating portion 2442 is parallel to the second radiating portion 2446. The length of the first radiating portion 2442 is greater than the length of the second radiating portion 2446. The length of the second radiation member 244 may be the sum of the length L4 of the first radiation portion 2442, the length L5 of the connection portion 2444, and the length L6 of the second radiation portion 2446.

Referring to fig. 1, in the present embodiment, the radiation unit 20 includes a connector 26 disposed on the substrate 10 and connecting the first radiator 22 and the first radiation member 242. In this way, the connector 26 can realize the connection between the first radiator 22 and the first radiator 242.

Specifically, the planar shape of the connecting body 26 may be rectangular. The connectors 26 are connected to one end of the first radiator 22 and one end of the second radiator 24, respectively. The first radiator 22 and the second radiator 24 are perpendicular to the connector 26, respectively. The first radiator 22 and the second radiator 24 are parallel to each other, so that the lateral and longitudinal dimensions of the radiating element 20 can be reduced.

Referring to fig. 1, in an embodiment of the present invention, the antenna 100 may be in the form of a dipole. The antenna 100 includes two radiation elements 20, and the two radiation elements 20 are arranged on the substrate 10 in mirror image.

Specifically, in one embodiment, referring to fig. 2, the length D4 of the antenna 100 may be set to 115mm and the width D5 set to 17mm as a whole. The two radiating elements 20 are respectively disposed on the same surface of the substrate 10. The two radiating elements 20 are identical in structure and size. It is understood that in other embodiments, the overall length and width of the antenna 100 may be set to other values, and are not limited in any way.

Referring to fig. 1 and 3, in the present invention, the antenna 100 includes two first radiators 22, two second radiators 24, and two connectors 26. Each connector 26 connects one first radiator 22 and one first radiating element 242. One of the connection bodies 26 is provided with a first feeding portion 28 and the other connection body 26 is provided with a second feeding portion 29, the first feeding portion 28 being adapted to be connected to an inner core 32 of a coaxial line 30 and the second feeding portion 29 being adapted to be connected to an outer conductor 34 of the coaxial line 30.

Specifically, in one embodiment, referring to fig. 1, above the centerline L of the antenna 100 is a first radiating element 20. Below the centre line L of the antenna 100 is a second radiating element 20. The connecting body 26 of the first radiating element 20 is provided with a first feeding portion 28, and the first feeding portion 28 is electrically connected with the first radiating element 20. The connecting body 26 of the second radiating element 20 is provided with a second feeding portion 29, and the second feeding portion 29 is electrically connected with the second radiating element 20.

Referring to fig. 3, fig. 3 is a schematic structural diagram of the coaxial line 30. An inner core 32 of a coaxial wire 30 is connected to the first feed 28. The outer conductor 34 of the coaxial line 30 is connected to the second feeding portion 29. The inner core 32 of the coaxial line 30 is electrically connected to the first radiating element 20 through the first feeding portion 28. The outer conductor 34 of the coaxial line 30 is electrically connected to the second radiating element 20 through the second feeding portion 29, and the second radiating element 20 is grounded through the outer conductor 34 of the coaxial line 30.

Referring to fig. 4, an embodiment of the present invention provides an unmanned aerial vehicle 1000. The drone 1000 includes a body 110 and the antenna 100 of any of the embodiments described above, the antenna 100 being connected to the body 110.

The utility model discloses in embodiment's unmanned aerial vehicle 1000, antenna 100 utilizes the break-make of switch piece 246 to realize three frequency covers, has reduced three frequency antenna 100's design size, and every frequency channel omnidirectional covers better.

Specifically, in the example of fig. 4, the drone 1000 includes a horn 120, the horn 120 being connected to a fuselage 110, and an antenna 100 mounted at the end of the horn 120. As such, the antenna 100 is in a relatively open position and away from the electronic devices inside the body of the drone 1000, and is not susceptible to electromagnetic interference from the electronic devices inside the body 110.

Further, the end of the horn 120 is connected with a support foot 170. The antenna 100 is mounted inside the foot 170. The wire connected to the antenna 100 may be connected to electrical components such as a control unit of the body 110 through the inside of the horn 120.

In other embodiments, the antenna 100 according to the embodiments of the present invention may be mounted on the body 110 or other portions of the horn 120, which is not limited herein.

In the example of fig. 4, a propeller 140 and a power assembly 130 may be connected to an end of the horn 120 away from the fuselage 110, and the power assembly 130 drives the propeller 140 to provide flight power for the drone 1000.

Referring to fig. 5, the drone 1000 includes a signal receiver 150 and a controller 160. The signal receiver 150 is connected to the antenna 100. The controller 160 connects the signal receiver 150 and the switching element 246. The controller 160 is used for controlling the on and off of the switching element 246 according to the signal strength received by the signal receiver 150.

In this way, the controller 160 can control the on/off of the switch 246 according to the signal strength received by the signal receiver 150, so that the drone 1000 can operate in a preferred frequency band.

Specifically, the data of the signal strength received by the signal receiver 150 may be fed back to the controller 160, and the controller 160 may control the on and off of the switching element 246 according to the signal strength. In one embodiment, the switching device 246 is a diode. The controller 160 may control the diode to be turned on and off according to the signal strength control. Under the condition that high level is connected to two ends of the diode, the diode is conducted, and the antenna 100 works in two frequency bands of 840MHz and 2.4 GHz. Under the condition that the two ends of the diode are connected with low levels, the diode is disconnected, and the antenna 100 works in two frequency bands of 1.4GHz and 2.4GHz, so that the antenna 100 can realize three-frequency coverage, and the antenna 100 is more miniaturized on the whole. The signal receiver 150 and the controller 160 may be mounted to the body 110.

In the case that the switching element 246 is turned on, if the signal strength is poor (e.g., the signal strength is less than the predetermined strength), the controller 160 may control the switching element 246 to be turned off, so as to switch the operating frequency band of the antenna 100 from 840MHz and 2.4GHz to 1.4GHz and 2.4 GHz. In the case that the switching element 246 is turned off, if the signal strength is poor (e.g., the signal strength is less than the predetermined strength), the controller 160 may control the switching element 246 to be turned on, so as to switch the operating frequency band of the antenna 100 from 1.4GHz and 2.4GHz to 840MHz and 2.4 GHz.

Referring to fig. 6, fig. 6 is a simulation diagram of the S11 parameter of the antenna 100 when the switch 246 is turned on. The graph shows the simulation curve of the S11 parameter of the antenna 100 operating in two frequency bands of 840MHz and 2.4 GHz. As can be seen from fig. 6, the S11 parameter of the antenna 100 is less than-10 dB in the 840MHz band and the 2.4GHz band,

referring to fig. 7, fig. 7 is a simulation diagram of the S11 parameter of the antenna 100 when the switch 246 is turned off. The simulation curve of the S11 parameter of the antenna 100 operating in two frequency bands, 1.4GHz and 2.4GHz, is shown. As can be seen from fig. 7, the S11 parameter of the antenna 100 is less than-10 dB in the 1.4GHz band and the 2.4GHz band,

referring to fig. 8, fig. 8 is a directional diagram of the antenna of the drone 1000 according to the present embodiment, where the frequency band is 840 MHz. As can be seen in fig. 8, the out-of-roundness of the antenna 100 at theta-90 degrees in the pattern plane is within 3 dB.

Referring to fig. 9, fig. 9 is a directional diagram of the frequency band of the antenna of the unmanned aerial vehicle 1000 of the present embodiment being 1.4 GHz. As can be seen in fig. 9, the out-of-roundness of the antenna 100 at theta-90 degrees in the pattern plane is within 3 dB.

Referring to fig. 10, fig. 10 is a directional diagram of the frequency band of the antenna of the drone 1000 of the present embodiment being 2.4 GHz. As can be seen in fig. 10, the out-of-roundness of the antenna 100 at theta-90 degrees in the pattern plane is within 3 dB.

Above-mentioned unmanned aerial vehicle 1000's antenna 100 utilizes the break-make of switch member 246 to realize covering 840MHz, 1.4GHz and the three frequency channel of 2.4GHz, and the omnidirectionality is better to, above-mentioned antenna 100's simple structure, the volume is less, has realized miniaturized design.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The above disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of the specific examples are described above. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

In the description of the present specification, reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides an be applied to unmanned aerial vehicle's antenna, its characterized in that is in including base plate and setting the radiating element of base plate, radiating element includes first irradiator and second irradiator, the second irradiator includes first radiant part, second radiant part and connects first radiant part with the switch part of second radiant part, first radiant part is connected first irradiator, first irradiator is used for radiating the electromagnetic wave of first frequency channel, the second irradiator is used for under the condition that the switch part switches on, radiates the electromagnetic wave of second frequency channel, and under the condition that the switch part breaks off, radiates the electromagnetic wave of third frequency channel, wherein, first frequency channel the second frequency channel reaches the third frequency channel is all inequality.

2. The antenna of claim 1, wherein the antenna comprises two radiating units, and the two radiating unit bodies are arranged on the substrate in a mirror image manner.

3. The antenna applied to the unmanned aerial vehicle of claim 1, wherein the radiating element comprises a connector disposed on the substrate and connecting the first radiator and the first radiating element.

4. The antenna of claim 3, wherein the antenna comprises two first radiators, two second radiators and two connectors, and each connector connects one first radiator and one first radiator.

5. The antenna applied to the unmanned aerial vehicle of claim 4, wherein one of the connecting bodies is provided with a first feeding portion, and the other connecting body is provided with a second feeding portion, the first feeding portion is used for being connected with an inner core of a coaxial line, and the second feeding portion is used for being connected with an outer conductor of the coaxial line.

6. The antenna applied to the unmanned aerial vehicle of claim 1, wherein the first radiator has a length of 19.2 ± 0.5mm and a width of 1 ± 0.2 mm;

the length of the first radiation piece is 20.5 +/-0.5 mm, and the width of the first radiation piece is 1 +/-0.2 mm;

the length of the second radiation piece is 61 +/-0.5 mm, and the width of the second radiation piece is 1 +/-0.2 mm.

7. The antenna of claim 1, wherein the second radiating element comprises a first radiating portion, a connecting portion and a second radiating portion, the first radiating portion is opposite to the second radiating portion at a distance, the connecting portion connects the first radiating portion and the second radiating portion, and the first radiating portion connects the switch element.

8. The antenna of claim 7, wherein the first radiating portion is parallel to the second radiating portion.

9. An unmanned aerial vehicle comprising a fuselage and the antenna of any of claims 1-8, the antenna being coupled to the fuselage.

10. The unmanned aerial vehicle of claim 9, wherein the unmanned aerial vehicle comprises a signal receiver and a controller, the signal receiver is connected with the antenna, the controller is connected with the signal receiver and the switch, and the controller is used for controlling the switch to be switched on and off according to the signal strength received by the signal receiver.

11. The drone of claim 9, wherein the drone includes a horn connected to the fuselage, the antenna being mounted at a distal end of the horn.