Unmanned aerial vehicle range extending antenna covering WIFI frequency band

Abstract

The invention discloses an unmanned aerial vehicle range extending antenna covering a WIFI frequency band. The unmanned aerial vehicle range extending antenna comprises a substrate, a signal line, a symmetrical oscillator, a stepped coplanar strip line, a director and a reflector, the stepped coplanar strip line extends along the center line direction of the substrate; one end of the signal line is provided with a feed port for loading working current, and the other end of the signal line is connected with the stepped coplanar strip line; the symmetrical dipoles are connected with the stepped coplanar strip line; the symmetrical dipoles are provided with two long symmetrical dipoles and two short symmetrical dipoles; the reflector is connected with the stepped coplanar strip line; a gap is formed between the director and the short symmetrical dipole, and the director and the reflector are respectively positioned at two ends of the symmetrical dipole; when the antenna works, the working current is divided into two parts of current, and electromagnetic waves are radiated outwards through the dipoles. When the antenna works in different frequency bands, the long symmetrical dipoles and the short symmetrical dipoles play different roles. The antenna provided by the invention can realize excellent performances of double frequency, wide frequency band, high gain and low reflection coefficient.

Description

Technical Field

[0001] The present invention relates to the field of antennas, and in particular to an extended-range antenna for unmanned aerial vehicles covering a WIFI frequency band. Background Art

[0002] WiFi has become one of the most common wireless communication technologies in modern life and work due to its high efficiency, convenience and universality. As an important component of wireless communication, WiFi antenna can directly affect the signal quality, transmission distance, stability and network capacity. Currently, the WiFi working frequency bands are 2.4GHz (2.4-2.483GHz, relative bandwidth 1.76%) and 5GHz (5.15-5.825GHz, relative bandwidth 12.3%). The 2.4 GHz band has a lower signal frequency, a wider coverage range and stronger penetration ability, and is suitable for some devices that do not require high speed, but the signal bandwidth of this band is narrow and the interference is large. The 5 GHz band has a wider bandwidth and less interference, which is suitable for high-speed data transmission scenarios. It can provide a faster and more stable wireless experience, but its signal penetration is poor and the coverage distance is short. Therefore, the 2.4 GHz and 5GHz bands have their own advantages and disadvantages. Only when the two bands are used in coordination can the maximum wireless advantage be brought into play.

[0003] With the rapid development of UAV (Unmanned Aerial Vehicle) technology, its application areas have expanded to remote sensing monitoring, communication relay, search and rescue, agricultural plant protection, logistics and transportation, etc. The functions of UAVs have surpassed traditional aircraft and have become an indispensable and important tool in many industries. Although UAVs have many advantages, they still face the problems of short communication distance and poor communication quality. In order to increase the communication distance of UAVs, improve the communication quality and extend the operation time, the use of high-performance UAV remote control extended-range antennas has become an effective solution. It is well known that the higher the antenna gain, the wider the range that the transmitted signal can cover and the longer the communication distance. Therefore, the extended-range antenna is usually designed as a directional antenna with high gain, which can concentrate and enhance the signal, thereby improving the communication performance.

[0004] At present, most WiFi dual-band antenna products on the market have low gain (usually 3-5dB) or poor standing wave performance; for example, the gain of CN218827822U WiFi dual-band antenna is only 2.8-3.8dB, and in the 2.4-2.5GHz frequency band (hereinafter referred to as 2.4GHz frequency band) and 5.15-5.85GHz frequency band (hereinafter referred to as 5GHz frequency band) the standing wave ratio is only less than 1.74. The WiFi dual-band antenna in the CN218415009U terminal has a S 11It only meets the requirement of less than -10dB, but no gain result is given; the CN220585498U WiFi dual-band antenna suitable for thin and light e-books has a relatively complex structure, and only meets the requirement of voltage standing wave ratio less than 2 in the 2.4GHz and 5GHz frequency bands, but no gain result is given; the CN208507950U dual-band WIFI built-in antenna has a return loss of only less than -10dB in the 2.4GHz frequency band, and a return loss of only less than -7dB in the 5GHz frequency range; the WIFI dual-band antenna in the CN110350303A WIFI wireless communication device has a return loss higher than -15dB at the edge of the band, and the antenna is an omnidirectional antenna with low gain and a short transmission distance.

[0005] The UAV range-extending antenna is limited by factors such as its weight, power consumption, and structural design complexity. Therefore, the research and design of related antennas are relatively scarce. Summary of the invention

[0006] The main purpose of the present invention is to overcome the above-mentioned defects in the prior art and propose a UAV range-extending antenna covering the WIFI frequency band, which achieves the excellent performance of dual-frequency, wide-band, high gain and low reflection coefficient by integrating multiple wide-band technologies.

[0007] The present invention adopts the following technical solution:

[0008] A drone range-extending antenna covering the WIFI frequency band, comprising a substrate; characterized in that it also comprises a signal line, a symmetrical vibrator, a stepped coplanar stripline, a director and a reflector; the stepped coplanar stripline is arranged on the front side of the substrate and extends along the center line direction of the substrate; the signal line is located on the back side of the substrate and a feeding port is arranged at one end thereof to load a working current, and the other end is connected to the stepped coplanar stripline through a via hole; the symmetrical vibrator is symmetrically arranged on the front side of the substrate relative to the center line of the substrate and connected to the stepped coplanar stripline The antenna is connected to the strip line, the symmetrical vibrator is provided with two long symmetrical vibrators and two short symmetrical vibrators spaced apart along the center line; the reflector is located on the front side of the substrate and connected to the stepped coplanar strip line; the director is spaced apart from the short symmetrical vibrator, and the director and the reflector are respectively located at two ends of the symmetrical vibrator; when the antenna is working, the working current is divided into two parts of current, which respectively pass through the symmetrical vibrators to radiate electromagnetic waves outward; when the antenna is working in different frequency bands, the long symmetrical vibrator and the short symmetrical vibrator also play different roles.

[0009] The stepped coplanar stripline is divided into two parts respectively having a first gap and a second gap; one end of the part of the stepped coplanar stripline having the first gap is connected to the reflector, and the other end thereof is connected to one end of the two long symmetrical vibrators; the long symmetrical vibrators extend outward in a direction perpendicular to the center line and operate in the WIFI low frequency band; one end of the part of the stepped coplanar stripline having the second gap is connected to one end of the two long symmetrical vibrators, and the other end thereof is connected to one end of the two short symmetrical vibrators; the two short symmetrical vibrators extend outward in a direction perpendicular to the center line and operate in the WIFI high frequency band.

[0010] The size of the first gap in the direction perpendicular to the center line is 0.5-1 mm, and its size in the direction of the center line is 20-22 mm; the size of the second gap in the direction perpendicular to the center line is 3-5 mm, and its size in the direction of the center line is 20-22 mm.

[0011] In a direction perpendicular to the center line, the sum of the dimensions of the two long symmetrical vibrators and the first gap is 45-48 mm, and the dimension of the long symmetrical vibrator in the direction of the center line is 4-6 mm;

[0012] In the direction perpendicular to the center line, the sum of the sizes of the two short symmetrical vibrators and the second gap is 35-38 mm, and the size of the short symmetrical vibrator in the direction of the center line is 4-6 mm.

[0013] An empty slot extending inwardly in a direction perpendicular to the center line is also provided on the outside of the short symmetrical oscillator, and the empty slot divides the short symmetrical oscillator into a first section branch oscillator and a second section branch oscillator of different sizes to achieve further broadband matching; the size of the empty slot in the direction of the center line is 0.5-1mm; the size of the first section branch oscillator in the direction perpendicular to the center line is 8-10mm, and the size of the second section branch oscillator in the direction perpendicular to the center line is 6-8mm.

[0014] The invention comprises two directors, which are placed at intervals in a direction perpendicular to the center line, with a distance between the two directors of 11-13 mm, and a distance between the director close to the symmetrical vibrator and the symmetrical vibrator of 6-8 mm.

[0015] The dimension of the reflector in the direction perpendicular to the center line is 53-55 mm, and the dimension in the direction perpendicular to the center line is 10-12 mm; the reflector is provided with cut angles at both ends in the direction perpendicular to the center line, and the cut angles are located on the side of the reflector close to the symmetrical oscillator.

[0016] In the center line direction, the distance between the via hole and the corresponding end of the reflector is 13-15 mm; the distance between the signal line and the center line is 3-4 mm; and the width of the signal line is 3-4 mm.

[0017] It can be seen from the above description of the present invention that, compared with the prior art, the present invention has the following advantages:

[0018] The present invention designs the drone range-extending antenna as a dual-band broadband antenna, which can support the antenna to work in two working frequency bands, 2.4GHz and 5.8GHz, at the same time, so that the drone can flexibly switch between different frequency bands to meet different flight requirements. In the 2.4GHz frequency band, the signal propagation distance is longer, while the 5.8GHz frequency band is suitable for high-definition image transmission. By supporting these two frequency bands at the same time, the dual-band antenna can provide better performance in terms of signal stability and image transmission, and improve the reliability and safety during the flight process.

[0019] The invention designs the UAV range-extending antenna as a dual-band broadband antenna. In the frequency range of 2.4-2.5GHz (covering the WiFi low frequency band) and 5.08-6.0GHz (covering the WiFi high frequency band), its return loss S 11 The parameters are all less than -15dB; compared with the prior art, the reflection coefficient of the present invention is far superior to that of the traditional antenna, which means that there is a large redundancy in accuracy during antenna processing and the reliability is higher.

[0020] The antenna of the present invention has a simple structure, is conducive to reducing the actual processing cost, is easy to process, and is light in weight. When combined with a mechanical device, it can be cleverly hidden in the bottom plate of the remote control, and has a more beautiful appearance.

[0021] The antenna of the present invention has a gain of 7.4-7.8dB in the 2.4-2.483GHz frequency band and a gain of 7.2-8.3dB in the 5.15-5.825GHz frequency band. The gain of the antenna is stable at more than 7dB in the WiFi working frequency band, which can meet the performance requirements of high gain. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the present invention;

[0023] Figure 2 is the front view of the substrate;

[0024] Figure 3 is the back side view of the substrate;

[0025] FIG4 (a) is a schematic diagram of various parameters of the present invention Figure 1 ;

[0026] FIG4( b ) is a schematic diagram of various parameters of the present invention Figure 2 ;

[0027] Figure 5 The return loss results of the antenna simulation and physical test of the present invention;

[0028] Figure 6 It is the frequency-gain simulation diagram;

[0029] Figure 7 The XOY plane gain pattern (dB) of the antenna of the present invention when operating at 2.4 GHz horizontal plane;

[0030] Figure 8 The gain pattern (dB) of the antenna of the present invention in the vertical YOZ plane when operating at 2.4 GHz;

[0031] Fig. 9 The three-dimensional gain pattern (dB) of the antenna of the present invention working at 2.4 GHz;

[0032] Fig.10 XOY plane radiation pattern (dB) of the antenna of the present invention working at 5.4 GHz horizontal plane;

[0033] Fig.11 The YOZ plane radiation pattern (dB) of the antenna of the present invention when operating at 5.4 GHz;

[0034] Fig.12 The three-dimensional gain pattern (dB) of the antenna of the present invention when operating at 5.4 GHz;

[0035] Fig.13 This is a physical diagram of the antenna of the present invention;

[0036] Fig.14 This is a test diagram of the antenna of the present invention.

[0037] in:

[0038] 10. Substrate; 20. Signal line; 21. Feed port; 22. Via hole; 30. Symmetrical oscillator; 31. Long symmetric oscillator; 32. Short symmetric oscillator; 33. Stepped coplanar stripline; 34. First gap; 35. Second gap; 36. Empty slot; 37. First branch oscillator; 38. Second branch oscillator; 40. Director; 50. Reflector; 51. Cutting angle. DETAILED DESCRIPTION

[0039] The present invention is further described below through specific implementation modes.

[0040] Reference Figure 1As shown in Fig. 4 (b), a drone range-extending antenna covering the WIFI frequency band includes a substrate 10, a signal line 20, a symmetrical oscillator 30, a stepped coplanar stripline 33, a director 40, and a reflector 50. The stepped coplanar stripline 33 is arranged on the front of the substrate 10 and extends along the center line of the substrate. The signal line 20 is located on the back of the substrate 10 and has a feeding port 21 at one end thereof. The feeding port 21 is used to load working current, including high-frequency current or low-frequency current, etc., and the other end is connected to the stepped coplanar stripline 33 on the front of the substrate 10 through a via 22. The symmetrical vibrator 30 is symmetrically arranged on the front side of the substrate 10 relative to the center line of the substrate 10 and is connected to the stepped coplanar strip line 33. The symmetrical vibrator 30 is provided with two long symmetrical vibrators 31 and two short symmetrical vibrators 32 spaced apart along the center line, that is, the two long symmetrical vibrators 31 are symmetrically arranged relative to the center line of the substrate 10, and the two short symmetrical vibrators 32 are symmetrically arranged relative to the center line of the substrate 10. The reflector 50 is located on the front side of the substrate 10 and is connected to the symmetrical vibrator 30. The director 40 is spaced apart from the symmetrical vibrator 30, and the director 40 and the reflector 50 are respectively located at two ends of the center line, and the symmetrical vibrator 30 is located between the director 40 and the reflector 50.

[0041] When the antenna is working, the working current is divided into two parts, and the current radiates electromagnetic waves outward through the symmetrical vibrator 30 respectively, that is, one part of the current radiates electromagnetic waves outward through the long symmetrical vibrator 31 and the short symmetrical vibrator 32 on one side, and the other part of the current radiates electromagnetic waves outward through the long symmetrical vibrator 31 and the short symmetrical vibrator 32 on the other side. In the present invention, when the antenna works in different frequency bands, the long symmetrical vibrator 31 and the short symmetrical vibrator 32 also play different roles respectively: when the antenna works in the low frequency band, the short symmetrical vibrator 32 can play the role of a partial director; when the antenna works in the high frequency band, the long symmetrical vibrator 31 and the reflector 50 can play the role of a reflector together.

[0042] The substrate 10 may be made of WL-CT300 material. =3, =0.0025. The shape and size of the substrate 10 can be set according to actual needs. In the figure, the substrate 10 is a rectangle with a length of L=54 mm, a width of W=90.6 mm, and a thickness of h=1.542 mm.

[0043] In order to ensure the uniformity and directivity of the radiation gain distribution of the antenna, the symmetrical oscillator 30 includes two long symmetrical oscillators 31 symmetrical to the center line of the substrate 10 and two short symmetrical oscillators 32 symmetrical to the center line of the substrate 10. In the figure, the center line of the substrate 10 is taken as the center line extending along the length direction of the substrate 10. The stepped coplanar stripline 33 extends along the center line direction and has two slots of different widths, so it can be split into two parts with a first slot 34 and a second slot 35 respectively: one end of the part of the stepped coplanar stripline 33 with the first slot 34 is connected to the reflector 50, and the other end is connected to the opposite end of the two long symmetrical oscillators 31, and the two long symmetrical oscillators 31 are separated by the first slot 34; the other end of the two long symmetrical oscillators 31 extends outward in the direction perpendicular to the center line and works in the WIFI low frequency band. One end of the portion of the stepped coplanar stripline 33 having the second slot 35 is connected to one end of the two long symmetrical vibrators 31, and the other end of the portion of the stepped coplanar stripline 33 having the second slot 35 is connected to one end of the two short symmetrical vibrators 32, and the two short symmetrical vibrators 32 are separated by the second slot 35; the short symmetrical vibrators 32 extend outward in a direction perpendicular to the center line and work in the WIFI high frequency band. In the direction perpendicular to the center line, the size of the long symmetrical vibrator 31 is larger than that of the short symmetrical vibrator 32. The stepped coplanar stripline 33 has two slots of different widths, so it can be called a stepped coplanar stripline. The size W of the stepped coplanar stripline 33 in the direction perpendicular to the center line is cps (including the first gap 34 or the second gap 35) can be set as needed. Among them, the size W of the first gap 34 in the direction perpendicular to the center line S1 The dimension S1 of the first slot 34 in the direction of the center line is 0.5-1mm, and the dimension S2 of the first slot 34 in the direction of the center line is 20-22mm. The stepped coplanar strip line 33 forms a stepped structure by opening two slots of different widths, which can effectively increase the resonant frequency range and expand the antenna bandwidth. The dimension W of the second slot 35 in the direction perpendicular to the center line is S2 The dimension S2 of the second gap 35 in the center line direction is 3-5 mm.

[0044] The long symmetrical vibrator 31 in the present invention works in the WIFI low frequency band. In the direction perpendicular to the center line, the sum of the sizes L1 of the two long symmetrical vibrators 31 and the first gap 34 is 45-48 mm, and the size W1 of the long symmetrical vibrator 31 in the center line direction is 4-6 mm; the short symmetrical vibrator 32 works in the WIFI high frequency band. In the direction perpendicular to the center line, the sum of the sizes L2 of the two short symmetrical vibrators 32 and the second gap 35 is 35-38 mm, and the size W2 of the short symmetrical vibrator 32 in the center line direction is 4-6 mm.

[0045] Furthermore, since the bandwidth of the WIFI high frequency band is relatively wide, in order to achieve broadband matching of the antenna, an empty slot 36 extending inward along the vertical center line direction is provided near the outer side of the short symmetrical oscillator 32. The empty slot 36 divides the short symmetrical oscillator 32 into a first branch oscillator 37 and a second branch oscillator 38 of different sizes to achieve broadband matching. The different sizes refer to the different sizes of the first branch oscillator 37 and the second branch oscillator 38 in the vertical center line direction.

[0046] The dimension X1 of the slot 36 in the centerline direction is 0.5-1 mm; the dimension X3 of the first branch vibrator 37 in the direction perpendicular to the centerline is 8-10 mm, and the dimension X2 of the second branch vibrator 38 in the direction perpendicular to the centerline is 6-8 mm. The present invention opens a rectangular slot 36 on the short symmetrical vibrator 32. By adjusting the length of the short symmetrical vibrator, the original short symmetrical vibrator 32 is split into two first branch vibrators 37 and second branch vibrators 38 of different lengths, which increases the degree of freedom on the one hand and provides an additional current path on the other hand, which can increase the additional resonance frequency and widen the frequency band.

[0047] Furthermore, two directors 40 are included. The two directors 40 are spaced apart in a direction perpendicular to the center line. Two rectangular directors 40 are provided to improve the gain. The dimensions of the two directors 40 in the direction perpendicular to the center line are the same. d1 = L d2 =13-15mm, the dimension W of the two directors 40 in the centerline direction d1 = W d2 =3-4mm. The centers of the two directors 40 are aligned with the second gap 35, the distance D2 between the two directors 40 is 11-13mm, and the distance D1 between the director 40 close to the symmetrical vibrator 30 and the symmetrical vibrator 30 is 6-8mm.

[0048] The reflector 50 uses a ground line composed of a microstrip line, which mainly improves the low-frequency radiation characteristics. The size of the reflector 50 in the direction perpendicular to the center line is greater than the sum of the sizes of the two long symmetrical oscillators 31. The size L of the reflector 50 in the direction perpendicular to the center line is 53-55 mm, and the size W in the center line direction is g It is 10-12mm.

[0049] In the present invention, in order to further broaden the low-frequency bandwidth of the antenna, the reflector 50 is digged using a digging technique, and cut corners 51 are provided at both ends of the reflector 50 in the direction perpendicular to the center line, and the cut corners 51 are located on the side close to the symmetrical vibrator 30 at both ends of the reflector 50. By providing the cut corners 51, more current path length is increased, and the radiation characteristics and current distribution of the antenna are improved. Among them, the size of the cut corner 51 in the direction perpendicular to the center line is X4=2-5mm.

[0050] Furthermore, the signal line 20 on the back of the substrate 10 is a microstrip line, and the distance X between the signal line 20 and the center line is f 3-4 mm; the width W of the signal line 20 f The signal line 20 is connected to the stepped coplanar strip line 33 through the via 22. The diameter of the via 22 can be 1 mm, but is not limited thereto. In the centerline direction, the distance Y between the via 22 and the corresponding end of the reflector 50 is f =13-15mm, which is approximately one quarter wavelength of the CPS line at the center frequency of the operating band.

[0051] The solution of the present invention has the following advantages:

[0052] Dual-band broadband: Figure 5 As shown in the simulation results, in the frequency band 2.4-2.5GHz (covering the WiFi low frequency band) and the frequency band 5.08-6.0GHz (covering the WiFi high frequency band), the return loss S 11 All parameters are less than -15dB; compared with existing technologies, the reflection coefficient is far superior to traditional antennas. It also means that there is greater redundancy in accuracy during antenna processing and higher reliability.

[0053] Lightweight: The antenna structure is relatively simple, which is conducive to reducing the actual processing cost, is easy to process, and is light in weight. When combined with a mechanical device, it can be cleverly hidden in the bottom plate of the remote control, making it more beautiful in appearance.

[0054] High gain: such as Figure 6 As shown, the antenna of the present invention has a gain of 7.4-7.8dB in the 2.4-2.483GHz frequency band, and a gain of 7.2-8.3dB in the 5.15-5.825GHz frequency band. The gain of the antenna is stable at more than 7dB in the WiFi working frequency band. Figure 7-Figure 12 Two standard planes, XOY and YOZ, and a three-dimensional gain pattern are given.

[0055] In order to verify the performance of the dual-frequency high-gain quasi-Yagi antenna designed in the present invention, a physical antenna was made and its performance was tested in a microwave darkroom. Fig.13 This is a photo of the actual antenna. Fig.14 This is the actual test picture of the antenna.

[0056] Figure 5 The comparison results of the return loss of the antenna of the present invention are shown in Figure 2. The test results are basically consistent with the simulation results. 11With a performance threshold of less than -15dB, the relative bandwidths of the two frequency bands of the antenna reached 4% (2.4-2.5 GHz) and 16.2% (5.1GHz-6.0GHz), respectively, which verifies that the antenna of the present invention can achieve dual-band and wide-band at the same time and has good standing wave performance.

[0057] The present invention takes the microstrip quasi-Yagi antenna as the design basis, integrates a variety of broadband technologies such as rectangular slots, corner digging, unequal length dipole feeding and other technologies to broaden the antenna bandwidth, and 11 With a performance threshold of less than -15dB, a high-performance antenna covering the entire WiFi frequency band is designed to achieve excellent performance of dual-band, wide-band, high gain and low reflection coefficient.

[0058] The terms "first", "second" and the like appearing in the present invention are only for the convenience of description to distinguish different components with the same name, and do not indicate a priority or primary and secondary relationship.

[0059] In the description of the present invention, the directions or positional relationships indicated by “up”, “down”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0060] In the description of this application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0061] In addition, in the description of this application, unless otherwise specified, "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0062] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A drone range-extending antenna covering the WIFI frequency band, comprising a substrate; characterized in that: The antenna also includes a signal line, a symmetrical oscillator, a stepped coplanar stripline, a director and a reflector; the stepped coplanar stripline is arranged on the front side of the substrate and extends along the center line of the substrate; the signal line is located on the back side of the substrate and a feeding port is arranged at one end thereof to load the working current, and the other end is connected to the stepped coplanar stripline through a via; the symmetrical oscillator is symmetrically arranged on the front side of the substrate relative to the center line of the substrate and connected to the stepped coplanar stripline, and the symmetrical oscillator is provided with two long symmetrical oscillators and two short symmetrical oscillators spaced along the center line; the reflector is located on the front side of the substrate and connected to the stepped coplanar stripline; the director is spaced from the short symmetrical oscillator, and the director and the reflector are respectively located at the two ends of the symmetrical oscillator; when the antenna is working, the working current is divided into two parts of the current, which respectively radiate electromagnetic waves outward through the symmetrical oscillator; when the antenna is working in different frequency bands, the long symmetrical oscillator and the short symmetrical oscillator also play different roles.

2. The UAV range-extending antenna covering the WIFI frequency band as claimed in claim 1, characterized in that: The stepped coplanar stripline is divided into two parts respectively having a first gap and a second gap; one end of the part of the stepped coplanar stripline having the first gap is connected to the reflector, and the other end thereof is connected to one end of the two long symmetrical vibrators; the long symmetrical vibrators extend outward in a direction perpendicular to the center line and operate in the WIFI low frequency band; one end of the part of the stepped coplanar stripline having the second gap is connected to one end of the two long symmetrical vibrators, and the other end thereof is connected to one end of the two short symmetrical vibrators; the two short symmetrical vibrators extend outward in a direction perpendicular to the center line and operate in the WIFI high frequency band.

3. The UAV range-extending antenna covering the WIFI frequency band as claimed in claim 2, characterized in that: The size of the first gap in the direction perpendicular to the center line is 0.5-1 mm, and its size in the direction of the center line is 20-22 mm; the size of the second gap in the direction perpendicular to the center line is 3-5 mm, and its size in the direction of the center line is 20-22 mm.

4. The UAV range-extending antenna covering the WIFI frequency band as claimed in claim 2, characterized in that: In the direction perpendicular to the center line, the sum of the dimensions of the two long symmetrical vibrators and the first gap is 45-48 mm, and the dimension of the long symmetrical vibrator in the direction of the center line is 4-6 mm.

5. The UAV range-extending antenna covering the WIFI frequency band as claimed in claim 2, characterized in that: In the direction perpendicular to the center line, the sum of the sizes of the two short symmetrical vibrators and the second gap is 35-38 mm, and the size of the short symmetrical vibrator in the direction of the center line is 4-6 mm.

6. The UAV range-extending antenna covering the WIFI frequency band as claimed in claim 1, characterized in that: An empty slot extending inwardly in a direction perpendicular to the center line is also provided on the outside of the short symmetrical oscillator, and the empty slot divides the short symmetrical oscillator into a first section branch oscillator and a second section branch oscillator of different sizes to achieve further broadband matching; the size of the empty slot in the direction of the center line is 0.5-1mm; the size of the first section branch oscillator in the direction perpendicular to the center line is 8-10mm, and the size of the second section branch oscillator in the direction perpendicular to the center line is 6-8mm.

7. The UAV range-extending antenna covering the WIFI frequency band as claimed in claim 1, characterized in that: The invention comprises two directors, which are placed at intervals in a direction perpendicular to the center line, with a distance between the two directors of 11-13 mm, and a distance between the director close to the symmetrical vibrator and the short symmetrical vibrator of 6-8 mm.

8. The UAV range-extending antenna covering the WIFI frequency band as claimed in claim 1, characterized in that: The dimension of the reflector in the direction perpendicular to the center line is 53-55 mm, and the dimension in the direction perpendicular to the center line is 10-12 mm; the reflector is provided with cut angles at both ends in the direction perpendicular to the center line, and the cut angles are located on the side of the reflector close to the symmetrical oscillator.

9. The UAV range-extending antenna covering the WIFI frequency band as claimed in claim 1, characterized in that: In the center line direction, the distance between the via hole and the corresponding end of the reflector is 13-15 mm; the distance between the signal line and the center line is 3-4 mm; and the width of the signal line is 3-4 mm.

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