CN110914155A

CN110914155A - Unmanned plane

Info

Publication number: CN110914155A
Application number: CN201880017076.1A
Authority: CN
Inventors: 吕超; 李栋; 魏建平
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2018-08-10
Filing date: 2018-10-29
Publication date: 2020-03-24
Anticipated expiration: 2038-10-29
Also published as: WO2020029438A1; CN208596783U; CN110914155B

Abstract

The application provides a drone (100). The unmanned aerial vehicle (100) comprises a body (101), a foot rest (102) and an antenna. The antenna includes a substrate, a radiating element, a parasitic element, and a reflecting element. The substrate is mounted on a foot stand (102). The radiation unit is fixed on the substrate. The radiating unit comprises a high-frequency radiating unit and a low-frequency radiating unit, and the frequency of the electromagnetic waves radiated by the low-frequency radiating unit is lower than that of the electromagnetic waves radiated by the high-frequency radiating unit. The parasitic element is fixed to the substrate with respect to the high-frequency radiating element. The reflection unit is arranged separately from the substrate, the radiation unit and the parasitic unit, and reflects the electromagnetic wave radiated by the low-frequency radiation unit.

Description

Unmanned plane

Technical Field

The application relates to the technical field of aircrafts, in particular to an unmanned aerial vehicle.

Background

A drone is an unmanned aerial vehicle that is manipulated by a radio remote control device or remote control to perform a task. In recent years, unmanned aerial vehicles have been developed and used in various fields, such as civil, industrial, and military applications. The unmanned aerial vehicle radiates and receives electromagnetic waves through the antenna, and wireless communication with the radio remote control equipment or the remote control device is achieved.

Disclosure of Invention

This application lies in providing an unmanned aerial vehicle, and its antenna can effectively improve the problem of the radiation direction slope of the null of high frequency channel and low frequency channel.

According to an aspect of embodiments of the present application, there is provided a drone, including: a body; a foot rest; and an antenna. The antenna includes: a base plate mounted on the foot rest; the radiation unit is fixed on the substrate and comprises a high-frequency radiation unit and a low-frequency radiation unit, and the frequency of electromagnetic waves emitted by the low-frequency radiation unit is lower than that of the electromagnetic waves emitted by the high-frequency radiation unit; a parasitic element fixed to the substrate with respect to the high-frequency radiating element; and a reflection unit which is provided separately from the substrate, the radiation unit, and the parasitic unit, and reflects the electromagnetic wave radiated by the low-frequency radiation unit.

Furthermore, the radiating element is positioned on one side surface of the substrate, and the parasitic element is positioned on the opposite side surface of the substrate.

Further, the distance between the parasitic element and the radiating element is greater than 0 and less than or equal to one third of the wavelength of the electromagnetic wave radiated by the high-frequency radiating element.

Further, the distance between the parasitic element and the radiating element is less than or equal to a quarter of the wavelength of the electromagnetic wave radiated by the high-frequency radiating element.

Further, the length of the parasitic element is less than or equal to the length of the high-frequency radiating element.

Further, the length of the parasitic element is equal to or greater than half of the length of the high-frequency radiating element.

Further, the reflection unit is placed in the air.

Further, the length of the reflection unit is equal to or greater than one half of the wavelength of the electromagnetic wave radiated by the low-frequency radiation unit.

Further, the radiating element comprises a radiating element of a dipole antenna.

Further, unmanned aerial vehicle including connect in the horn of fuselage, the reflection unit is located in the horn.

The utility model provides an unmanned aerial vehicle's antenna includes parasitic element and reflection element, and parasitic element is fixed in the base plate for high frequency radiation unit, can effectively improve the problem that the zero of high frequency channel caves in, and the reflection element reflects the electromagnetic wave that the low frequency radiation unit radiated out, can effectively improve the problem of the radiation direction slope of low frequency channel.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

Fig. 1 is a perspective view of an embodiment of the drone of the present application.

Fig. 2 is a schematic diagram of one embodiment of the antenna of the drone shown in fig. 1.

Fig. 3 is a schematic diagram of the position relationship between the antenna shown in fig. 2 and the body of the drone.

Fig. 4 is a schematic top view of the antenna and the body of the drone shown in fig. 3.

Fig. 5 is a radiation pattern of a high frequency electromagnetic wave radiated by the antenna shown in fig. 2.

Fig. 6 is a schematic diagram of another embodiment of an antenna of a drone.

Fig. 7 is a side view of the antenna shown in fig. 6.

Fig. 8 is a radiation pattern of a high frequency electromagnetic wave of the antenna shown in fig. 6.

Fig. 9 is a comparative radiation pattern of high frequency electromagnetic waves for the antenna shown in fig. 6 and the antenna shown in fig. 2.

Fig. 10 is a radiation pattern of a low frequency electromagnetic wave radiated by the antenna shown in fig. 6.

Fig. 11 is a radiation pattern of a low frequency electromagnetic wave radiated by the antenna shown in fig. 2.

Fig. 12 is a schematic view of the environment in which the antenna is located.

Figure 13 is a schematic diagram of another embodiment of an antenna of a drone

Fig. 14 is a comparative radiation pattern of low frequency electromagnetic waves for the antenna shown in fig. 13 and the antenna shown in fig. 6.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

The unmanned aerial vehicle of the embodiment of the application includes fuselage, foot rest and antenna. The antenna includes a substrate, a radiating element, a parasitic element, and a reflecting element. The substrate is mounted on the foot rest. The radiation unit is fixed on the substrate. The radiating unit comprises a high-frequency radiating unit and a low-frequency radiating unit, and the frequency of the electromagnetic waves radiated by the low-frequency radiating unit is lower than that of the electromagnetic waves radiated by the high-frequency radiating unit. The parasitic element is fixed to the substrate with respect to the high-frequency radiating element. The reflection unit is arranged separately from the substrate, the radiation unit and the parasitic unit, and reflects the electromagnetic wave radiated by the low-frequency radiation unit. Unmanned aerial vehicle's antenna includes parasitic element and reflection element, and the parasitic element is fixed in the base plate for high frequency radiation unit, can effectively improve the problem of the null of high frequency channel, and the reflection element reflects the electromagnetic wave that the low frequency radiation unit radiated out, can effectively improve the problem of the radiation direction slope of low frequency channel.

The unmanned aerial vehicle of this application is explained in detail below with the accompanying drawing. The features of the following examples and embodiments may be combined with each other without conflict.

Fig. 1 shows a perspective view of an embodiment of a drone 100. The drone 100 may be used for aerial photography, mapping, monitoring, but is not so limited. In other embodiments, the drone 100 may also be used for agriculture, express delivery, providing web services, and the like. The drone 100 includes a fuselage 101, a foot stand 102, and an antenna (not shown). The drone 100 also includes an arm 103 connected to the fuselage 101.

The antenna is located within the drone 100 and is therefore not shown in fig. 1. The drone 100 radiates and receives electromagnetic waves through an antenna, enabling wireless communication with a radio remote control device or a remote control device. The antenna can receive a control signal sent by the radio remote control equipment or the remote control device, and can send the image shot by the unmanned aerial vehicle to the radio remote control equipment or the remote control device.

The body 101 may carry a load such as the photographing apparatus 104 or the like. In some embodiments, the capture device 104 may be mounted directly to the head of the body 101. In other embodiments, the photographing apparatus 104 is mounted on the head of the body 101 through a pan-tilt. In some embodiments of agricultural drones, the fuselage 101 may carry a load such as a sprinkler for spraying water, pesticide, etc. In other embodiments, the fuselage 101 may carry other loads. The main body 101 may be mounted with a battery 105, a controller (not shown), and the like. The battery 105 provides electrical energy for the flight of the drone 100, and the controller may control the flight of the drone 100, etc. The body 101 shown in fig. 1 is substantially flat and elongated. In other embodiments, the body 101 may take on other shapes.

In some embodiments, the foot rest 102 is mounted below the horn 103. In other embodiments, the foot rest 102 is mounted below the fuselage 101. The foot rest 102 plays a supporting and buffering role when the unmanned aerial vehicle 100 takes off and lands, and prevents the fuselage 101, the horn 103, loads or other components from directly colliding with the ground and being damaged.

In the embodiment shown in fig. 1, the horn 103 is foldably mounted to the body 101. During take-off, flight and landing, the arms 103 are deployed and extend outwardly of the fuselage 101. When unmanned aerial vehicle 100 does not use, can fold horn 103 in the side of fuselage 101, conveniently carry and accomodate. The horn 103 may be folded and unfolded automatically or manually. In other embodiments, the horn 103 is a fixed horn that is fixed to the outside of the fuselage 101.

The end of the horn 103 is mounted with a power assembly 106 to drive the drone 100 to fly. The power assembly 106 may receive electrical energy from the battery 105. The power assembly 106 includes a motor 107 and an airfoil 108. The battery 105 supplies power to the motor 107, and the motor 107 drives the wing 108 to rotate. In the illustrated embodiment, the wing 108 is a rotor, the rotating shaft of the motor 107 is connected to the shaft of the wing 108, and the motor 107 rotates to drive the wing 108 to rotate. The controller may control the rotational speed and steering of the motors 107 to control the rotation of the wings 108, and thus the flight of the drone 100. Fig. 1 is only one example of a drone and is not limited to the example shown in fig. 1.

Fig. 2 is a schematic diagram illustrating one embodiment of an antenna 200. The antenna 200 may radiate high frequency electromagnetic waves (or referred to as a "high frequency band", e.g., 5.8GHz) and low frequency electromagnetic waves (or referred to as a "low frequency band", e.g., 2.4 GHz). The antenna 200 may be a dual-band antenna or a multi-band antenna.

The antenna 200 includes a substrate 210 and a radiation element 220, and the radiation element 220 is fixed to the substrate 210. The base plate 210 is mounted to the foot rest 102 of the drone 100. The substrate 210 may include a PCB board on which a radio frequency chip (not shown) electrically connected to the radiation unit 220 may be mounted. The rf chip is electrically connected to the radiating unit 220 through a feeder, and transmits an rf signal generated by the rf chip to the radiating unit 220 through the feeder. The radiating element 220 receives power from the feeding line, and is excited by the feeding line to radiate an electromagnetic wave.

The radiation unit 220 includes a high frequency radiation unit 221 and a low frequency radiation unit 222. The electromagnetic wave excited by the low-frequency radiating element 222 is lower in frequency than the electromagnetic wave excited by the high-frequency radiating element 221. For example, the high frequency radiation unit 221 radiates a high frequency electromagnetic wave of 5.8GHz, and the low frequency radiation unit 222 radiates a low frequency electromagnetic wave of 2.4 GHz.

In some embodiments, antenna 200 may be a dipole antenna, may be a single dipole antenna, or may be a miniaturized dipole antenna. The radiation unit 220 includes a radiation unit of a dipole antenna. The radiation unit 220 has a symmetrical structure, and the low frequency radiation unit 222 is connected to the high frequency radiation unit 221. The high-frequency radiating unit 221 is in the shape of a pair of open frames facing back to back, and the three sides of the frame are surrounded, and the opening faces outward. The low frequency radiating elements 222 are in the form of a pair of horns extending outwardly from the opening, with the horns facing outwardly.

Fig. 3 is a schematic diagram showing a positional relationship between the antenna 200 and the main body 101, and fig. 4 is a schematic diagram showing a top view of the antenna 200 and the main body 101. For illustrative purposes only, one surface of the body 101 is illustrated as a plane in fig. 3 and 4, but in practice the surface of the body 101 may be a plane or a curved surface. The body 101 reflects the electromagnetic waves radiated from the antenna 200, and the body 101 may be regarded as a reflection plate.

The electromagnetic wave propagation also has the transmission characteristics of the wave, and the electromagnetic wave is a vector, has amplitude and phase, is superposed in phase and attenuated in opposite phase. When the electromagnetic wave is reflected on the metallic body 101, the phase is reversed. When the distance D between the antenna 200 and the surface of the body 101 is 1/4 wavelengths, the reflection path is 1/4 wavelengths, and the back-and-forth path of the electromagnetic wave emitted to the antenna 200 is 1/2 wavelengths, 180 degrees in phase. The reflected electromagnetic wave reaches the antenna 200 in the same phase as the electromagnetic wave radiated forward by the antenna 200 at that time, and the reflected electromagnetic wave and the electromagnetic wave radiated forward by the antenna 200 are superimposed in the same phase, so that the radiation efficiency of the antenna 200 is maximized at that time, and the gain of the antenna 200 is maximized. The distance D may be the closest distance of the antenna 200 to the surface of the body 101.

When distance D equals 1/2 wavelengths, the reflected path is 1/2 wavelengths and the back and forth path is one wavelength, 360 degrees phase. The reflected electromagnetic wave reaches the antenna 200 in reverse phase to the electromagnetic wave radiated forward at this time by the antenna 200, and the reflected electromagnetic wave and the electromagnetic wave radiated forward by the antenna 200 are attenuated in reverse phase, so that a null point occurs, resulting in a null. The radiation pattern of the antenna 200 gradually splits when the distance D is greater than 1/4 wavelengths and less than 1/2 wavelengths. When the distance D is longer than 1/2 wavelengths, the antenna 200 radiates electromagnetic waves with a larger interference area and a larger number of nulls.

Some dual-band or multi-band antennas radiate electromagnetic waves with a high frequency ratio of low frequency to high frequency, for example, 5.8GHz to 2.4 GHz. The wavelength of the high frequency electromagnetic wave is short and the distance D of the antenna 200 from the body 101 is long relative to the wavelength of the high frequency electromagnetic wave. The distance D of the antenna 200 from the body 101 is generally greater than one wavelength of the high frequency electromagnetic wave, when the null point appears due to the reflection action of the body 101.

Fig. 5 shows a radiation pattern of a high frequency electromagnetic wave radiated by the antenna 200 shown in fig. 2-4, wherein the distance D of the antenna 200 from the body 101 is about twice the wavelength of the high frequency electromagnetic wave. In fig. 5, the solid line indicates the horizontal plane pattern, and the broken line indicates the pitch plane pattern. It can be seen from fig. 5 that there are three nulls from 0 degrees to 90 degrees in the horizontal plane pattern, with the nulls being deepest at-15 dB. It can be seen that when the distance D from the antenna 200 to the body 101 is greater than one wavelength of the high-frequency electromagnetic wave, the high-frequency band has more nulls, severe null traps, and a non-circular directional pattern.

Fig. 6 is a schematic diagram of another embodiment of an antenna 300, and fig. 7 is a side view of the antenna 300. The antenna 300 shown in fig. 6 and 7 is similar to the antenna 200 of the embodiment shown in fig. 2. The antenna 300 shown in fig. 6 and 7 includes a substrate 310 and a radiation element 320. Substrate 310 is similar to substrate 210 of the embodiment shown in FIG. 2; the radiating element 320 is similar to the radiating element 220 of the embodiment shown in fig. 2; the radiation unit 320 includes a high frequency radiation unit 321 and a low frequency radiation unit 322, which are similar to the high frequency radiation unit 221 and the low frequency radiation unit 222, respectively, and are not described in detail herein.

The antenna 300 shown in fig. 6 and 7 further includes a parasitic element 330 relative to the antenna 200 of the embodiment shown in fig. 2. The parasitic element 330 is fixed to the substrate 310 with respect to the high-frequency radiating element 321. The base plate 310, the radiating element 320 and the parasitic element 330 are all located within the foot rest 102 of the drone 100. The radiating unit 320 is excited to radiate an electromagnetic wave, and the parasitic unit 330 generates an induced current, thereby radiating the electromagnetic wave. The parasitic unit 330 reduces the reflection amount of the high frequency band, thereby improving the null of the high frequency band and the non-circularity of the directional diagram of the high frequency band.

Fig. 8 shows the radiation pattern of the high frequency electromagnetic waves of the antenna 300 of fig. 6 and 7 in the environment of fig. 3. Here, the distance D of the antenna 200 from the body 101 is about twice the wavelength of the high frequency electromagnetic wave. The solid line represents the horizontal plane pattern and the dashed line represents the pitch plane pattern. It can be seen from fig. 8 that the deepest nulls are of the order of 1 dB. The nulls in fig. 8 are significantly improved compared to the radiation pattern of the high frequency electromagnetic waves of the antenna 200 of fig. 5 without the parasitic element.

Fig. 9 shows the comparative radiation patterns of the antenna 300 with the parasitic element 320 shown in fig. 6 and the antenna 200 without the parasitic element shown in fig. 2. The solid line is the horizontal plane pattern of the high frequency electromagnetic wave radiated by the antenna 300, and the dotted line is the horizontal plane pattern of the high frequency electromagnetic wave radiated by the antenna 200. The deepest null boost is seen to be 13 dB. As can be seen, the parasitic element 330 is disposed on the substrate 310 relative to the high-frequency radiating element 321, so that the null can be effectively improved, and the out-of-roundness of the pattern can be improved.

With continued reference to fig. 6 and 7, the parasitic element 330 and the radiating element 320 are disposed on the substrate 310. For high frequency electromagnetic waves, the wavelength is short, and the parasitic element 330 and the radiating element 320 are separated by a small distance, so that the effect of improving the null can be achieved. Therefore, the thickness of the substrate 310 can satisfy the requirement of the distance between the parasitic element 330 and the radiating element 320. Thus, the parasitic element 330 and the radiating element 320 are both disposed on the substrate 310, which can improve the null and is beneficial to the miniaturization of the antenna.

In one embodiment, the radiating element 320 is located on one side of the substrate 310, and the parasitic element 330 is located on the opposite side of the substrate 310. The radiating element 320 may be fixed to the front surface of the substrate 310, and the parasitic element 330 may be fixed to the rear surface of the substrate 310. In some embodiments, the distance between the parasitic element 330 and the radiating element 320 is greater than 0 and equal to or less than one third of the wavelength of the electromagnetic wave radiated by the high-frequency radiating element 321. That is, the distance between the parasitic element 330 and the high-frequency radiating element 321 in the thickness direction of the substrate 310 is equal to or less than one third of the wavelength of the high-frequency electromagnetic wave. In some embodiments, the distance between the parasitic element 330 and the radiating element 320 is equal to or less than a quarter of the wavelength of the electromagnetic wave radiated from the high-frequency radiating element 321. I.e. the distance between the parasitic element 330 and the radiating element 320 is less than a quarter of the high frequency electromagnetic wave.

In some embodiments, the length L1 of the parasitic element 330 is less than or equal to the length L2 of the high-frequency radiating element 321, so as to avoid the parasitic element 330 being too long and weakening the voltage standing wave ratio. In some embodiments, the length L1 of the parasitic element 330 is equal to or greater than half the length L2 of the high-frequency radiating element 321, so as to ensure the improved null effect. In some embodiments, the projection of the parasitic element 330 on the front surface of the substrate 310 at least partially overlaps with the projection of the high-frequency radiating element 321 on the front surface of the substrate 310. In the illustrated embodiment, the parasitic element 330 is disposed to be offset to one side of the high-frequency radiating element 221.

Fig. 10 shows a radiation pattern of a low-frequency electromagnetic wave radiated from the antenna 300 shown in fig. 6, and fig. 11 shows a radiation pattern of a low-frequency electromagnetic wave radiated from the antenna 200 shown in fig. 2 without the parasitic element. The solid line represents the horizontal plane pattern and the dashed line represents the pitch plane pattern. The horizontal plane pattern of the low frequency electromagnetic wave in fig. 10 is inclined to an example compared with the radiation pattern shown in fig. 11. When the parasitic element 330 is provided, the radiation energy of the low frequency electromagnetic wave is radiated toward the parasitic side.

Fig. 12 is a schematic diagram of the environment in which the antenna 300 is located. In some embodiments, the antenna 300 is located in the foot rest 102 below the motor 107, as shown in connection with fig. 1. Since the antenna 300 is close to the motor 107 and the diameter of the motor 107 is close to the 1/4 wavelength of the low frequency electromagnetic wave radiated by the antenna 300, the motor 107 will guide the low frequency electromagnetic wave and the radiation pattern of the low frequency electromagnetic wave will be guided by the motor 107 to generate an inclination. The antenna 200 shown in fig. 2 is placed in the environment shown in fig. 12, and the radiation pattern of the low-frequency electromagnetic wave is also tilted.

Fig. 13 is a schematic diagram of another embodiment of an antenna 400. The antenna 400 is similar to the antenna 300 of the embodiment shown in fig. 6 and 7. The antenna 400 includes the substrate 310, the radiating element 320 and the parasitic element 330 of the antenna 300 of the embodiment shown in fig. 6 and 7, which are still indicated by reference numeral 300 and are not described herein again. In comparison with the antenna 300, the antenna 400 shown in fig. 13 further includes a reflection unit 440. Referring to fig. 6 in combination, the reflection unit 440 is provided separately from the substrate 310, the radiation unit 320, and the parasitic unit 330, and reflects the electromagnetic wave radiated from the low frequency radiation unit 322. The reflection unit 440 radiates the low frequency electromagnetic wave to improve the problem that the radiation direction of the low frequency electromagnetic wave is inclined. In some embodiments, the reflective unit 440 is suspended.

The tilt characteristics of the pattern can be optimized by adjusting the lateral dimensions and/or length of the reflecting element 440. In one embodiment, the length of the reflection unit 440 is equal to or greater than one-half of the wavelength of the electromagnetic wave radiated by the low frequency radiation unit 322. That is, the length of the reflection unit 440 is equal to or greater than 1/2 of the wavelength of the low frequency electromagnetic wave to ensure an effect of improving the pattern tilt.

The reflection unit 440 is located inside the horn 103 (shown in fig. 1), and can utilize the space inside the horn 103. The space inside the horn 103 is large relative to the space of the foot rest 102, and the horn 103 can accommodate the reflecting unit 440 having a large size, so that the inclination of the directivity pattern can be improved more. The reflecting unit 440 may extend along the inner wall of the horn 103, making full use of the space of the horn 103, and making the transverse dimension of the reflecting unit 440 as large as possible. The length of the reflection unit 440 may be substantially equal to the length of the inner space of the horn 103.

Fig. 14 shows the comparative radiation patterns of the low-frequency electromagnetic waves of the antenna 400 provided with the reflection unit 400 in fig. 13 and the antenna 300 not provided with the reflection unit in fig. 6, wherein the radiation patterns are elevation patterns. Wherein the length of the reflection unit 440 is 1/2 of the wavelength of the low frequency electromagnetic wave. The solid line is the elevation pattern of the low frequency electromagnetic wave radiated by the antenna 400 and the dotted line is the elevation pattern of the low frequency electromagnetic wave radiated by the antenna 300. As can be seen from the figure, the beam width of 5dB, the beam of the low frequency electromagnetic wave radiated by the antenna 400 is back close to 30deg, and the effect of the reflection unit 440 in improving the tilt of the directional diagram is significant.

The attitude angle of the unmanned aerial vehicle is between +35 degrees and-35 degrees, and the unmanned aerial vehicle uses the antenna 400 provided with the reflection unit 440, so that the electromagnetic wave coverage can be ensured within a required range. The antenna 400 is provided with the parasitic element 330 and the reflection element 440, so that the null of the directional pattern of the high-frequency electromagnetic wave can be improved, and the problem of inclination of the directional pattern of the low-frequency electromagnetic wave caused by the parasitic element 330, the motor 107 and other components can be solved, thereby ensuring good wireless communication and good use experience of users.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The method and apparatus provided by the embodiments of the present invention are described in detail above, and the principle and the embodiments of the present invention are explained in detail herein by using specific examples, and the description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

The disclosure of this patent document contains material which is subject to copyright protection. The copyright is owned by the copyright owner. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the patent and trademark office official records and records.

Claims

1. An unmanned aerial vehicle, its characterized in that, it includes:

a body;

a foot rest; and

an antenna, comprising:

a base plate mounted on the foot rest;

the radiation unit is fixed on the substrate and comprises a high-frequency radiation unit and a low-frequency radiation unit, and the frequency of electromagnetic waves emitted by the low-frequency radiation unit is lower than that of the electromagnetic waves emitted by the high-frequency radiation unit;

a parasitic element fixed to the substrate with respect to the high-frequency radiating element; and

and the reflecting unit is arranged separately from the substrate, the radiating unit and the parasitic unit and reflects the electromagnetic wave radiated by the low-frequency radiating unit.

2. A drone according to claim 1, wherein the radiating elements are located on one side of the substrate and the parasitic elements are located on an opposite side of the substrate.

3. The unmanned aerial vehicle of claim 1, wherein a distance between the parasitic element and the radiating element is greater than 0 and less than or equal to one-third of a wavelength of the electromagnetic waves radiated by the high-frequency radiating element.

4. A drone according to claim 3, characterised in that the distance between the parasitic element and the radiating element is less than or equal to a quarter of the wavelength of the electromagnetic waves radiated by the high-frequency radiating element.

5. The drone of claim 1, wherein the length of the parasitic element is less than or equal to the length of the high frequency radiating element.

6. The drone of claim 1, wherein the length of the parasitic element is greater than or equal to half the length of the high frequency radiating element.

7. The drone of claim 1, wherein the reflection unit is placed in air.

8. The drone of claim 1, wherein the length of the reflection unit is greater than or equal to one-half of the wavelength of the electromagnetic waves radiated by the low frequency radiation unit.

9. A drone according to claim 1, characterised in that the radiating element comprises a radiating element of a dipole antenna.

10. The drone of claim 1, wherein the drone includes a horn connected to the fuselage, the reflection unit being located within the horn.