A microstrip quasi-yagi antenna suitable for anti-UAV signal jamming device

Abstract

The application discloses a microstrip quasi-Yagi antenna suitable for anti-UAV signal interference devices, which comprises a first dielectric plate and a second dielectric plate, a first antenna array structure of a first frequency band is formed on the first dielectric plate, a second antenna array structure of a second frequency band and a third antenna array structure of a third frequency band are formed on the second dielectric plate; wherein the first dielectric plate and the second dielectric plate are arranged on the same plane and the two dielectric plates are arranged at a predetermined distance, and the second antenna array structure and the third antenna array structure formed on the second dielectric plate are arranged at intervals along the width direction of the second dielectric plate. The application forms three frequency band quasi-Yagi antenna array structures on the two dielectric plates, ensures high gain radiation of the antenna and realizes miniaturization of the antenna. Compared with a traditional Yagi antenna structure form, the antenna occupies a smaller space, has a lighter weight, and as a plate-shaped antenna, is more suitable for integration in a device, and is convenient for conformal with other carriers.

Description

Technical Field

[0001] The present invention belongs to the field of antenna technology, and in particular relates to a microstrip quasi-Yagi antenna suitable for an anti-UAV signal jamming device. Background Art

[0002] Drones are currently being widely used in aerial photography, agriculture, express delivery, disaster relief, surveillance and mapping, news reporting, and power inspections. Consequently, social security and privacy issues are gaining increasing attention. The most common method for countering drones is to employ anti-drone signal jammers to suppress radio interference. Antennas, as the first component in anti-drone signal jammers that radiates and receives signals, largely determine the efficiency and quality of the radio jamming. Furthermore, with the advancement of modern communications and electronic countermeasures technology, equipment requirements for antenna size, weight, and gain are increasing. According to general design practice, antenna size largely determines its maximum radiation gain.

[0003] The main directional antenna design options in existing anti-drone technology are as follows: 1. Using high-gain horn antennas to achieve high radiation efficiency and directivity, gradually expanding the waveguide opening so that the majority of the energy transmitted in the waveguide is radiated from the horn. This single horn antenna can achieve wide bandwidth coverage, but achieving high-gain radiation across the entire frequency band is difficult, and it cannot achieve the advantages of multi-band high-power signal suppression. In addition, horn antennas are heavier than antennas of other structural types and do not meet the requirements for lightweight equipment. 2. Using plate antennas composed of aluminum array antennas. This novel miniaturized antenna structure uses a three-dimensional surface surround design, introducing multiple antenna elements to form an array and improve overall array gain. However, this overall array structure of plate antennas results in a large overall antenna planar footprint, making it difficult to integrate with specific devices. 3. Using multiple single-frequency traditional Yagi antennas to achieve multi-frequency signal transmission. The Uda-Yagi antenna is an end-fire array antenna evolved from the dipole antenna, typically consisting of a single active element and multiple passive elements placed parallel in the same plane. In a Yagi antenna structure, only the active element is fed, while the other passive elements can only generate induced currents through coupling with the active element. Therefore, the inverter is slightly longer than the active element, exhibiting inductive behavior, while the director is slightly shorter than the active element, exhibiting capacitive behavior. Consequently, the phase of the element current lags along the direction of maximum radiation. Because the spacing between the elements is slightly less than a quarter wavelength, inductive parasitic elements weaken the radiation energy in the direction of the passive element, while capacitive parasitic elements enhance the radiation energy in the direction of the passive element. This maximizes the energy radiation from the reflector to the director element. The Yagi antenna boasts a simple structure and is easy to implement, achieving a narrow bandwidth with good directivity and high gain. However, the antenna itself is relatively large in size, weight, and difficulty in debugging. Furthermore, the metal rod structure of the Yagi antenna makes it unconformable to other carriers. Therefore, existing antenna designs for counter-UAV applications cannot achieve both high-gain radiation and miniaturization, failing to meet practical application requirements. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a microstrip quasi-Yagi antenna suitable for anti-UAV signal jamming devices, which ensures high-gain radiation of the antenna while achieving miniaturization of the antenna.

[0005] To achieve the above-mentioned objectives, the microstrip quasi-Yagi antenna suitable for an anti-UAV signal jamming device of the present invention includes a first dielectric plate and a second dielectric plate, wherein a first antenna array structure of a first frequency band is formed on the first dielectric plate, and a second antenna array structure of a second frequency band and a third antenna array structure of a third frequency band are formed on the second dielectric plate; wherein the first dielectric plate and the second dielectric plate are arranged in the same plane and the two dielectric plates are arranged at a predetermined distance, and the second antenna array structure and the third antenna array structure formed on the second dielectric plate are arranged at intervals along the width direction of the second dielectric plate.

[0006] Furthermore, the first antenna array structure includes an active array, a reflector and a director array. The active array is arranged near the end of the first dielectric plate and is arranged along the width direction of the first dielectric plate according to a predetermined length. The reflector is arranged at the end of the first dielectric plate near the active array. The director array is spaced apart from the active array. Multiple directors in the director array are spaced apart at a predetermined distance along the length direction of the first dielectric plate, and each director is arranged along the width direction of the first dielectric plate according to a predetermined length.

[0007] Furthermore, the first antenna array structure includes one active array, one reflector and 14 directors, the length of the active array is 78mm-80mm and the length of the director is 62mm-70mm, half of the length of the active array is set on the first surface of the first dielectric plate, and the other half of the length of the active array is set on the second surface of the first dielectric plate opposite to the first surface.

[0008] Furthermore, the second antenna array structure includes an active array, a reflector and a director array. The active array is arranged near the end of the second dielectric plate and is arranged along the width direction of the second dielectric plate according to a predetermined length. The reflector is arranged at the end of the second dielectric plate near the active array. The director array is spaced apart from the active array. Multiple directors in the director array are spaced apart at a predetermined distance along the length direction of the second dielectric plate, and each director is arranged along the width direction of the second dielectric plate according to a predetermined length.

[0009] Furthermore, the second antenna array structure includes one active array, one reflector and 14 directors, the length of the active array is 48mm-50mm and the length of the director is 37mm-42mm, half of the length of the active array is set on the first surface of the second dielectric plate, and the other half of the length of the active array is set on the second surface of the second dielectric plate opposite to the second surface.

[0010] Furthermore, the third antenna array structure includes an active array, a reflector, and a director array. The active array is arranged near the end of the second dielectric plate and is arranged along the width direction of the second dielectric plate according to a predetermined length. The reflector is arranged at the end of the second dielectric plate near the active array. The director array is spaced apart from the active array. Multiple directors in the director array are spaced apart at a predetermined distance along the length direction of the second dielectric plate, and each director is arranged along the width direction of the second dielectric plate according to a predetermined length.

[0011] Furthermore, the third antenna array structure includes one active array, one reflector and 27 directors, the length of the active array is 18mm-20mm and the length of the director is 13mm-16mm, half of the length of the active array is set on the first surface of the second dielectric plate, and the other half of the length of the active array is set on the second surface of the second dielectric plate opposite to the second surface.

[0012] Furthermore, the active array arranged on the first surface is connected to the inner core of the coaxial cable probe through a soldering pad, and the active array arranged on the second surface is connected to the outer conductor of the coaxial cable through a soldering pad.

[0013] Furthermore, the first dielectric plate and the second dielectric plate are high-frequency plates.

[0014] Furthermore, the first frequency band of the first antenna array structure formed on the first dielectric plate is the 1.5 GHz band, the second frequency band of the second antenna array structure formed on the second dielectric plate is the 2.4 GHz band, and the third frequency band of the third antenna array structure formed on the second dielectric plate is the 5.8 GHz band.

[0015] This invention forms a three-band quasi-Yagi antenna array structure on two dielectric plates, ensuring high-gain radiation while achieving antenna miniaturization. Compared to traditional Yagi antenna structures, this antenna occupies less space and is lighter. As a plate-shaped antenna, it is more suitable for integration into devices and can conform to other carriers.

[0016] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic structural diagram of a microstrip quasi-Yagi antenna according to an embodiment of the present invention;

[0019] Figure 2A 、 Figure 2B 2. It is a structural schematic diagram of a first antenna array structure formed on a first dielectric plate in a microstrip quasi-Yagi antenna according to an embodiment of the present invention;

[0020] Figure 3A 、 Figure 3B A schematic structural diagram of a second antenna array structure and a third antenna array structure formed on a second dielectric plate in a microstrip quasi-Yagi antenna according to an embodiment of the present invention;

[0021] Figure 4A 、 Figure 4B A schematic diagram of a microstrip quasi-Yagi antenna feeder interface structure according to an embodiment of the present invention;

[0022] Figure 5 is the array reflection coefficient (S11) of the microstrip quasi-Yagi antenna array of the present invention at 1.5 GHz, 2.4 GHz and 5.8 GHz.

[0023] Figure 6 The radiation patterns of the microstrip quasi-Yagi antenna array of the present invention at 1.5 GHz, 2.4 GHz and 5.8 GHz. DETAILED DESCRIPTION

[0024] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0025] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the term "connected" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection. It can also mean a mechanical connection or an electrical connection. It can also mean a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The terms "top," "bottom," "above," "lower," and "on," "left-right," and "upper-lower" used throughout this description refer to relative positions of components of a device, such as the relative positions of the top and bottom substrates within a device. It will be understood that devices are multifunctional regardless of their orientation in space.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or the number of the technical features indicated. Thus, references to "first" and "second" features may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0028] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0029] like Figure 1 As shown, the microstrip quasi-Yagi antenna suitable for an anti-UAV signal jamming device of the present invention includes a first dielectric plate 1 and a second dielectric plate 2, wherein a first antenna array structure 11 of a first frequency band is formed on the first dielectric plate 1, and a second antenna array structure 21 of a second frequency band and a third antenna array structure 22 of a third frequency band are formed on the second dielectric plate 2; wherein the first dielectric plate 1 and the second dielectric plate 2 are arranged in the same plane and the two dielectric plates are arranged at a predetermined distance, and the second antenna array structure 21 and the third antenna array structure 22 formed on the second dielectric plate 2 are arranged at intervals along the width direction of the second dielectric plate 2.

[0030] The anti-UAV signal jamming directional antenna of the present invention is processed and printed on a high-frequency dielectric board. The first dielectric board 1 and the second dielectric board 2 are made of high-frequency boards. Unlike conventional epoxy resin PCB boards, the boards use a ceramic base as a high-frequency material, which has excellent dielectric constant and temperature stability, and can be used to improve the shortcomings of the PTFE substrate. The first antenna array structure 11, the second antenna array structure 21 and the third array structure 22 are printed on the dielectric board using patches, and the patches are made of a copper-free material. It should be noted that the above is only an example, and the present invention is not limited to this.

[0031] Figure 2A is a schematic diagram of the front side of the first dielectric plate; Figure 2B is a schematic diagram of the back side of the first dielectric plate. Figure 2A and 2B As shown, the first antenna array structure 11 includes an active array 111, a reflector 112 and a director array 113. The active array 111 is arranged near the end of the first dielectric plate 1 and is arranged along the width direction of the first dielectric plate 1 according to a predetermined length. The reflector 112 is arranged at the end of the first dielectric plate 1 near the active array 111. The director array 113 is spaced apart from the active array 111. Multiple directors in the director array 113 are spaced apart along the length direction of the first dielectric plate 1 according to a predetermined distance, and each director is arranged along the width direction of the first dielectric plate 1 according to a predetermined length.

[0032] Based on given electrical characteristics such as antenna gain, operating bandwidth, and front-to-back radiation ratio, the geometric structural parameters of the Yagi antenna, such as the number of required oscillators, the shape and dimensions of the reflector, feed oscillator, and director, as well as the spacing between them, can be determined. The reflector length, lr, is slightly larger than the half-wavelength of the lowest frequency within the operating band, generally ranging from 2lr = (0.5 to 0.55)λ. Located to one side of the active oscillator, it weakens the active oscillator's ability to receive or transmit electromagnetic waves in that direction. There is only one reflector because the radiation energy from the feed oscillator to the reflector oscillator is already very weak under the influence of the director oscillator. On the other side of the active oscillator are directors, typically multiple in number. These directors are slightly shorter than the active oscillator and have a roughly uniform length: 2ln = (0.38-0.42)λ, where ln is the length of the nth element and λ is the wavelength. Alternatively, they gradually shorten as the distance from the reflector increases, with the length of each subsequent director decreasing by 2-3%. This enhances the active oscillator's ability to receive or reflect electromagnetic waves in that direction. Within a certain range, increasing the number of directors increases the antenna's gain and front-to-back ratio of radiated power. However, after increasing the number of directors, the gain hardly improves. Furthermore, the antenna's size and profile increase, its weight increases, the substrate material requirements become higher, and design and commissioning costs increase.

[0033] In one specific embodiment of the present invention, a 1.5GHz microstrip quasi-Yagi antenna can be printed on the first dielectric plate 1, achieving miniaturization of the high-gain antenna. The wavelength of the 1.575GHz anti-UAV jamming signal is 190mm. The resulting microstrip Yagi antenna structural parameters are shown in Table 1. The total dielectric plate length is 485mm, and the front and back ground planes are 10mm long. The upper half of the active array 111 is located on the front of the circuit board. To achieve a narrow main lobe beamwidth and high gain, the antenna comprises 15 arrays: one active array 111, one reflector 112, and a director array 113 containing 14 directors. The lengths of the directors and the distances between them vary, and the width of each director is set to 4mm.

[0034] Table 1 1.5GHz microstrip quasi-Yagi antenna structural parameters (unit: mm)

[0035] Serial number Formation name Array length Array width 1 Active array 78-80 5 2 Director 1-5 65-70 4 3 Director 6-8 62-65 4 4 Director 9-13 65-72 4 5 Director 14 63-65 4

[0036] It should be noted that the sizes and locations of the active array, reflector, and director in this embodiment are for illustrative purposes only and are not intended to limit the present invention. Adjustments may be made based on actual needs. Furthermore, the number of directors may be increased or decreased as needed. For example, the length of the active array is 78 mm to 80 mm, and the length of the director may be between 62 mm and 70 mm. The length of the active array in Table 1 is the total length of the active array on both the front and back sides. In this embodiment, half of the length of the active array is placed on the front side of the dielectric plate, and the other half is placed on the back side of the dielectric plate. This reduces the space occupied by the active array, and allows the selection of a smaller first dielectric plate, further reducing the size and weight of the microstrip quasi-Yagi antenna.

[0037] Figure 3A Schematic diagram of the front side of the second dielectric plate. Figure 3B is a schematic diagram of the back side of the second dielectric plate. Figure 3A and 3B As shown, the second antenna array structure 21 includes an active array 211, a reflector 212 and a director array 213. The active array 211 is arranged near the end of the second dielectric plate 2 and the active array 211 is arranged along the width direction of the second dielectric plate 2 according to a predetermined length. The reflector 212 is arranged at the end of the second dielectric plate 2 near the active array 211. The director array 213 is spaced apart from the active array 211. Multiple directors in the director array 213 are spaced apart along the length direction of the second dielectric plate 2 according to a predetermined distance, and each director is arranged along the width direction of the second dielectric plate 2 according to a predetermined length.

[0038] In one specific embodiment of the present invention, a 2.4GHz microstrip quasi-Yagi antenna and a 5.8GHz microstrip quasi-Yagi antenna are integrated on the same dielectric board to save space. The second dielectric board 2 and the first dielectric board 1 can be made of the same high-frequency material. The structural parameters of the 2.4GHz microstrip quasi-Yagi antenna are shown in Table 2. To achieve a narrow beamwidth and high gain with a small main lobe, the number of directors in the 2.4GHz Yagi antenna is set to 14. Therefore, the antenna comprises a total of 15 elements, including one active element and 14 directors, each 2mm wide. Furthermore, to save space on the antenna panel due to the added director element, the width of the reflector on the back of the panel is adjusted to 20mm.

[0039] Table 2 2.4GHz microstrip quasi-Yagi antenna structural parameters (unit: mm)

[0040] Serial number Formation name Array length Array width 1 Active array 48-50 2 2 Director 1-7 39-42 2 3 Director 8-12 38-41 2 4 Director 13-14 39-41 2

[0041] It should be noted that the sizes and locations of the active array, reflector, and director in this embodiment are for illustrative purposes only and are not intended to limit the present invention. Adjustments may be made based on actual needs. Furthermore, the number of directors may be increased or decreased as needed. For example, the length of the active array is 48 mm to 50 mm, and the length of the director may be between 37 mm and 42 mm. The length of the active array in Table 2 is the total length of the active array on both the front and back sides. In this embodiment, half of the length of the active array is located on the front side of the dielectric plate, and the other half is located on the back side of the dielectric plate. This reduces the space occupied by the active array, and allows the selection of a smaller first dielectric plate, further reducing the size and weight of the microstrip quasi-Yagi antenna.

[0042] like Figure 3A and 3B As shown, the third antenna array structure 22 includes an active array 221, a reflector 212, and a director array 223. The active array 221 is positioned near the end of the second dielectric plate 2 and arranged along the width of the second dielectric plate 2 at a predetermined length. The reflector 222 is positioned at the end of the second dielectric plate 2 near the active array 221. The director array 223 is spaced apart from the active array 221. Multiple directors in the director array 223 are spaced apart at predetermined intervals along the length of the second dielectric plate 2, and each director is arranged along the width of the second dielectric plate 2 at a predetermined length. The second antenna array structure 21 and the third antenna array structure are integrated on the same dielectric plate and share a common reflector.

[0043] In one specific embodiment of the present invention, the third antenna array structure 22 is a 5.8 GHz microstrip quasi-Yagi antenna with structural parameters shown in Table 3. The antenna features 28 director arrays positioned in the radiation direction of the printed dipole to increase gain while reducing beamwidth. The patch director arrays have a thickness of 1 mm, and their length decreases with increasing distance from the active array. When the active array is excited, the director arrays generate induced currents under the influence of the field. By appropriately adjusting the spacing and size of the directors, the Yagi antenna composed of the printed dipoles and directors produces strong radiation in the direction of the directors.

[0044] Table 3 5.8GHz microstrip quasi-Yagi antenna structural parameters

[0045] Serial number Formation name Array length Array width 1 Active array 18-20 1 2 Director 1-10 14.5-15.5 1 3 Director 11-19 13.5-14.5 2 4 Director 20-27 12-13.5 2

[0046] It should be noted that the sizes and locations of the active array, reflector, and director in this embodiment are for illustrative purposes only and are not intended to limit the present invention. Adjustments may be made based on actual needs. Furthermore, the number of directors may be increased or decreased as needed. For example, the length of the active array is 18 mm to 20 mm, and the length of the director may be between 13 mm and 16 mm. The length of the active array in Table 3 is the total length of the active array on both the front and back sides. In this embodiment, half of the length of the active array is located on the front side of the dielectric plate, and the other half is located on the back side of the dielectric plate. This reduces the space occupied by the active array, and allows the selection of a smaller first dielectric plate, further reducing the size and weight of the microstrip quasi-Yagi antenna.

[0047] To achieve the three-band signal transmission requirements of the anti-drone signal jammer, three Yagi antennas (1.575 GHz, 2.4 GHz, and 4.8 GHz) are combined to form a Yagi antenna array. This antenna utilizes triple feeds to achieve signal radiation across all three bands. Two dielectric plates are placed in the same plane, with the second dielectric plate 2 positioned above the first dielectric plate 1, and a 20 mm spacing between the two plates. The distance between the second antenna array structure and the second antenna array structure formed on the second dielectric plate 2 can be set to 40-45 mm. This minimizes the impact of mutual coupling between the antennas, ensuring that the combined antennas occupy a smaller space without compromising antenna radiation gain. Furthermore, a fixing panel is placed between the two dielectric plates to maintain the spacing between them. The fixing panel is made of a non-metallic material, such as plastic, and is secured to the underside of the dielectric plates with nylon screws. This ensures that the two panels are securely locked to the bracket, ensuring structural stability and preventing the antennas from shifting due to external forces.

[0048] In one embodiment of the present invention, Figure 4A Schematic diagram of the front side of the dielectric plate; Figure 4B Figure 1 is a schematic diagram of the back of the dielectric plate. Figure 4A 、 Figure 4BAs shown, the active array on the first surface is connected to the inner core of the coaxial cable probe via solder pad 41, while the active array on the second surface is connected to the outer conductor of the coaxial cable via solder pad 42. This directional antenna utilizes a simple feeding method without a balun structure. The antenna radiating arrays are printed on both sides of the dielectric substrate. The front microstrip line connects to the upper half of the array on the front side of the dielectric substrate, and the back microstrip line connects to the lower half of the array on the back side of the dielectric substrate. This method achieves balanced-unbalanced conversion, resulting in a half-cycle phase difference between the left and right excitation arrays. All three antennas use the same coaxial probe connection method: the inner core of the coaxial cable probe is connected to the front half of the active array; the outer conductor extends from the front of the antenna board through the dielectric layer to connect to the back half of the active array. To ensure consistent cable output direction, a copper-clad patch is printed on the dielectric substrate next to the active array as a solder pad. A matrix of small metalized through-holes is provided on the solder pad to provide soldering connections between the front and back sides. The front pad is isolated from the active array with a spacing of 1 mm, while the back pad is electrically connected to the array.

[0049] When soldering the coaxial feeder core, solder it to the bottom of the front active half. When doing so, carefully control the wire stripping length to minimize the exposed core length. Also, minimize the solder contact area while ensuring soldering effectiveness. After stripping, solder the outer conductor of the coaxial cable to the front pad and connect it to the back half through a metalized via.

[0050] In order to make the advantages of the solution of the present invention more clear, the present invention is further described in detail below with reference to simulation experiment parameters. Figure 5 、 Figure 6 The following are the simulation results for the entire array. Verification shows that the reflection coefficients of all three antennas meet the S11 requirement of less than -10dB. Furthermore, the reduction in far-field radiation gain of each antenna before and after the array design is less than 1dB, ensuring that the array radiation gain remains above 15dBi.

[0051] In summary, this invention designs three new microstrip quasi-Yagi antennas and defines their combination for an anti-UAV signal jammer. The antennas utilize a structure that combines Yagi and microstrip antennas. Overall, the technical solutions conceived by this invention offer the following advantages over existing technologies:

[0052] 1. Compared with the traditional Yagi antenna structure, this antenna takes up less space and is lighter. As a plate-shaped antenna, it is more suitable for integration into the device and is easy to conform to other carriers.

[0053] 2. Integrating the 2.4GHz and 5.8GHz antennas onto the same dielectric board enables miniaturization and minimizes the effects of mutual coupling between antennas.

[0054] 3. Each antenna can achieve a high gain of 15dBi at the center frequency, and the main lobe half-power beamwidth is controlled within 40°, with good directional radiation performance, which can greatly improve the suppression effect of high-power signals;

[0055] 4. Use a simple feeding method without a balun structure to achieve balanced-unbalanced conversion, simplify the antenna structure and reduce the overall weight, and improve the antenna's impedance matching while ensuring high gain.

[0056] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0057] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A microstrip quasi-Yagi antenna suitable for an anti-UAV signal jammer, characterized in that: The device comprises a first dielectric plate and a second dielectric plate, wherein a first antenna array structure for a first frequency band is formed on the first dielectric plate, and a second antenna array structure for a second frequency band and a third antenna array structure for a third frequency band are formed on the second dielectric plate; wherein the first dielectric plate and the second dielectric plate are arranged on the same plane and spaced apart by a predetermined distance, and the second antenna array structure and the third antenna array structure formed on the second dielectric plate are spaced apart along the width direction of the second dielectric plate; The first antenna array structure includes an active array, a reflector, and a director array. The active array is disposed near an end of the first dielectric plate and arranged along the width direction of the first dielectric plate at a predetermined length. The reflector is disposed at the end of the first dielectric plate near the active array. The director array is spaced apart from the active array. Multiple directors in the director array are spaced apart at a predetermined distance along the length direction of the first dielectric plate, and each director is arranged along the width direction of the first dielectric plate at a predetermined length. The second antenna array structure includes an active array, a reflector, and a director array, wherein the active array is disposed near an end of the second dielectric plate and arranged along the width direction of the second dielectric plate at a predetermined length, the reflector is disposed at the end of the second dielectric plate near the active array, the director array is spaced apart from the active array, and a plurality of directors in the director array are spaced apart at a predetermined distance along the length direction of the second dielectric plate, and each director is arranged along the width direction of the second dielectric plate at a predetermined length; The third antenna array structure includes an active array, a reflector, and a director array. The active array is arranged near the end of the second dielectric plate and is arranged along the width direction of the second dielectric plate according to a predetermined length. The reflector is arranged at the end of the second dielectric plate near the active array. The director array is spaced apart from the active array. Multiple directors in the director array are spaced apart at a predetermined distance along the length direction of the second dielectric plate, and each director is arranged along the width direction of the second dielectric plate according to a predetermined length.

2. The microstrip quasi-Yagi antenna according to claim 1, wherein: The first antenna array structure includes one active array, one reflector and 14 directors. The length of the active array is 78mm-80mm and the length of the director is 62mm-70mm. Half of the length of the active array is set on the first surface of the first dielectric plate, and the other half of the length of the active array is set on the second surface of the first dielectric plate opposite to the first surface of the first dielectric plate.

3. The microstrip quasi-Yagi antenna according to claim 1, wherein: The second antenna array structure includes one active array, one reflector and 14 directors. The length of the active array is 48mm-50mm and the length of the director is 37mm-42mm. Half of the length of the active array is set on the first surface of the second dielectric plate, and the other half of the length of the active array is set on the second surface of the second dielectric plate opposite to the first surface of the second dielectric plate.

4. The microstrip quasi-Yagi antenna according to claim 1, wherein: The third antenna array structure includes one active array, one reflector and 27 directors. The length of the active array is 18mm-20mm and the length of the director is 13mm-16mm. Half of the length of the active array is set on the first surface of the second dielectric plate, and the other half of the length of the active array is set on the second surface of the second dielectric plate opposite to the first surface of the second dielectric plate.

5. The microstrip quasi-Yagi antenna according to claim 2, 3 or 4, characterized in that: The active array arranged on the first surface is connected to the inner core of the coaxial cable probe through the welding pad, and the active array arranged on the second surface is connected to the outer conductor of the coaxial cable through the welding pad.

6. The microstrip quasi-Yagi antenna according to claim 1, wherein: The first dielectric plate and the second dielectric plate are high-frequency plates.

7. The microstrip quasi-Yagi antenna according to claim 1, wherein: The first frequency band of the first antenna array structure formed on the first dielectric plate is 1.5 GHz, the second frequency band of the second antenna array structure formed on the second dielectric plate is 2.4 GHz, and the third frequency band of the third antenna array structure formed on the second dielectric plate is 5.8 GHz.

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