Unmanned aerial vehicle monitoring direction-finding antenna with coplanar layout

Abstract

The utility model discloses an unmanned aerial vehicle monitoring direction-finding antenna with coplanar layout, which comprises an omnidirectional antenna unit array, a directional antenna unit array, a receiving module mounting cavity and an antenna mounting bottom plate, and is characterized in that the omnidirectional antenna unit array, the directional antenna unit array and the receiving module mounting cavity are all arranged on the antenna mounting bottom plate; the omnidirectional antenna unit array and the directional antenna unit array are arranged in a staggered manner in a circumferential array, and the receiving module installation cavity is arranged in the center. The two antenna arrays are combined together in a coplanar layout mode, and mutual interference between the antenna units is reduced in the mode of forming holes in the antenna units and adding an anti-reflection wave-absorbing material. According to the monitoring direction-finding antenna, the height and the size are reduced, a receiving unit installation cavity is reserved in the center of the antenna, the system integration degree is improved, and the monitoring direction-finding antenna has more advantages in vehicle-mounted, portable and other application scenes.

Description

Technical Field

[0001] The utility model relates to a monitoring and direction-finding antenna, in particular to a coplanarly arranged unmanned aerial vehicle monitoring and direction-finding antenna. Background Art

[0002] With the rapid development of drone technology, drones have been widely used in private, commercial, military and other fields. However, the "illegal flying" of drones without authorization or in violation of regulations has brought potential risks and threats to public safety, aviation safety and privacy. The drone monitoring and countermeasure system is an electronic device specially used for monitoring, identifying, locating and countering drones, which can provide corresponding protection for important places and activities. The drone monitoring and direction finding antenna is one of the important devices in the system. Its basic working principle is to receive the electromagnetic wave signal emitted by the drone, and convert it into a direction angle through the direction finding algorithm according to the different spatial response characteristics of the receiving antenna array to the electromagnetic wave amplitude and phase, so as to perform drone direction finding and positioning. In order to adapt to different drone signal formats, the drone monitoring and direction finding antenna usually has a wider operating frequency and needs to be designed in frequency bands. In order to reduce the mutual influence of antennas in different frequency bands, a multi-layer stacking layout is used to combine them together. This layout method results in a large volume and high height of the drone monitoring and direction finding antenna, which has an adverse effect on the installation, transportation and concealment of the antenna. Utility Model Content

[0003] In order to overcome the shortcomings of the existing UAV monitoring and direction-finding antennas that adopt a multi-layer layout structure, reduce the antenna height, reduce the mutual influence of antennas in different frequency bands, and improve the performance of the monitoring and direction-finding antenna, the utility model provides a UAV monitoring and direction-finding antenna with a coplanar layout, which mainly adopts the following technical solutions:

[0004] A coplanarly arranged unmanned aerial vehicle monitoring and direction-finding antenna comprises: an omnidirectional antenna unit array, a directional antenna unit array, a receiving module mounting cavity and an antenna mounting base plate, wherein the omnidirectional antenna unit array, the directional antenna unit array and the receiving module mounting cavity are all arranged on the antenna mounting base plate, the omnidirectional antenna unit array and the directional antenna unit array are arranged alternately in a circular array, and the receiving module mounting cavity is placed in the center.

[0005] Furthermore, the omnidirectional antenna unit array is composed of 5 to 13 broadband dipole antenna units, and each broadband dipole antenna unit is evenly installed on the antenna installation base plate according to a circumference.

[0006] Furthermore, the metal radiator of the broadband dipole antenna unit is of symmetrical butterfly-shaped design. In order to reduce interference between antenna units, a group of elliptical openings are provided in the metal radiator, and an impedance matching network is designed at the central feed.

[0007] Furthermore, the directional antenna unit array is composed of directional antenna units, the number of directional antenna units is the same as the number of broadband dipole antenna units and they are staggered, each directional antenna unit is evenly installed on the antenna mounting base according to the circumference, and the radiating end of the directional antenna unit and the outer edge of the broadband dipole antenna unit are located on the same circumference.

[0008] Furthermore, a bottom plate absorbing material is installed on the side of the antenna installation bottom plate facing the antenna to reduce reflection interference of the antenna installation bottom plate.

[0009] Furthermore, a cavity absorbing material is installed on the outer layer of the receiving module installation cavity to reduce reflection interference of the receiving module installation cavity.

[0010] Furthermore, the operating frequency of the omnidirectional antenna unit array is 0.3-1.4 GHz.

[0011] Furthermore, the operating frequency of the directional antenna unit array is 1.4 to 8 GHz.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model combines antenna arrays of two operating frequencies in a coplanar layout, and reduces mutual interference between antenna units by opening holes in the antenna units and adding anti-reflection absorbing materials. The utility model reduces the height and volume of the UAV monitoring and direction-finding antenna, and reserves a cavity for the receiving unit installation in the center of the antenna, which improves the system integration, shortens the transmission cable length between the antenna and the receiving unit, reduces RF loss and cost, improves antenna performance, and has more advantages in vehicle-mounted and portable application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of the overall structure of a coplanarly arranged UAV monitoring and direction-finding antenna of the utility model.

[0015] Figure 2 This is a front view of the overall structure of a coplanarly arranged UAV monitoring and direction-finding antenna of the utility model.

[0016] Figure 3 This is a front view of the broadband dipole antenna unit structure of the utility model.

[0017] Markings in the figure: 100-omnidirectional antenna unit array, 200-directional antenna unit array, 300-receiving module installation cavity, 400-antenna installation base plate, 110-broadband dipole antenna unit, 111-metal radiator, 112-elliptical opening, 113-impedance matching network, 210-directional antenna unit, 310-cavity absorbing material, 410-base absorbing material DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods. Specific embodiment one:

[0020] This embodiment is a coplanar layout of the UAV monitoring and direction-finding antenna.

[0021] like Figure 1-3 As shown, a coplanarly arranged unmanned aerial vehicle monitoring and direction-finding antenna comprises: an omnidirectional antenna unit array (100), a directional antenna unit array (200), a receiving module installation cavity (300) and an antenna installation base plate (400), wherein the omnidirectional antenna unit array (100), the directional antenna unit array (200) and the receiving module installation cavity (300) are all arranged on the antenna installation base plate (400), the omnidirectional antenna unit array (100) and the directional antenna unit array (200) are arranged alternately in a circular array, and the receiving module installation cavity is placed in the center.

[0022] The omnidirectional antenna unit array (100) is composed of 7 broadband dipole antenna units (110), each broadband dipole antenna unit (110) is evenly installed on the antenna installation base plate (400) according to the circumference. The broadband dipole antenna unit (110) is manufactured by using the printed circuit board process, the metal radiator (111) is a symmetrical butterfly design, the operating frequency is 0.3-1.4 GHz, the antenna height is 120 mm, and the width is 50 mm. Six elliptical openings (112) are arranged in the metal radiator (111), and an impedance matching network (113) is designed at the center feed to improve the reflection coefficient of the antenna.

[0023] The directional antenna unit array (200) is composed of 7 directional antenna units (210), which are logarithmic periodic antennas with an operating frequency of 1.4 to 8 GHz and are also manufactured using a printed circuit board process. The 7 directional antenna units (210) are formed into a radial circular array and are staggered with the omnidirectional antenna unit array (100) and installed on an antenna installation base plate (400). The radiating end of the directional antenna unit (210) and the outer edge of the broadband dipole antenna unit (110) are located on the same circumference to maximize the aperture of the directional antenna unit array (200).

[0024] The antenna installation base plate (400) is integrally processed from aluminum alloy, and the base plate absorbing material (410) is installed on the side facing the antenna by using a structural adhesive bonding process; the receiving module installation cavity (300) is also integrally processed from aluminum alloy, and the cavity absorbing material (310) is installed on the outer layer by using a structural adhesive bonding process. The absorbing material can significantly reduce electromagnetic wave reflection and reduce interference to the antenna array.

[0025] According to the specific use of the equipment, a single-channel or multi-channel receiving unit can be selected inside the receiving module installation cavity (300), and an electronic compass, a navigation module, etc. can also be installed on the cavity to meet different needs; and a lightweight, reliable, and wave-transmitting antenna cover is selected to protect the drone monitoring and direction-finding antenna.

[0026] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A coplanar layout UAV monitoring and direction finding antenna, the main features of which are: An omnidirectional antenna unit array (100), a directional antenna unit array (200), a receiving module installation cavity (300) and an antenna installation base plate (400); the omnidirectional antenna unit array (100), the directional antenna unit array (200) and the receiving module installation cavity (300) are all arranged on the antenna installation base plate (400); the omnidirectional antenna unit array (100) and the directional antenna unit array (200) are arranged alternately in a circular array, and the receiving module installation cavity is placed in the center.

2. The coplanar layout UAV monitoring and direction finding antenna according to claim 1, characterized in that: The omnidirectional antenna unit array (100) is composed of 5 to 13 broadband dipole antenna units (110), and each broadband dipole antenna unit (110) is evenly distributed on the circumference of the antenna installation base plate (400).

3. The coplanar layout UAV monitoring and direction finding antenna according to claim 1, characterized in that: The metal radiator (111) of the broadband dipole antenna unit (110) is of symmetrical butterfly-shaped design and is provided with a group of elliptical openings (112). An impedance matching network (113) is designed at the central feeding position.

4. The coplanar layout UAV monitoring and direction finding antenna according to claim 1, characterized in that: The directional antenna unit array (200) is composed of directional antenna units (210), the number of the directional antenna units (210) is the same as the number of the broadband dipole antenna units (110) and they are arranged in a staggered manner, each directional antenna unit (210) is evenly installed on the antenna installation base plate (400) according to a circumference, and the radiation end of the directional antenna unit (210) and the outer edge of the broadband dipole antenna unit (110) are located on the same circumference.

5. The coplanar layout UAV monitoring and direction finding antenna according to claim 1, characterized in that: A bottom plate absorbing material (410) is installed on the side of the antenna installation bottom plate (400) facing the antenna.

6. The coplanar layout UAV monitoring and direction finding antenna according to claim 1, characterized in that: The outer layer of the receiving module installation cavity (300) is installed with cavity absorbing material (310).

7. The coplanar layout UAV monitoring and direction finding antenna according to claim 1, characterized in that: The operating frequency of the omnidirectional antenna unit array (100) is 0.3-1.4 GHz.

8. The coplanar layout UAV monitoring and direction finding antenna according to claim 1, characterized in that: The operating frequency of the directional antenna unit array (200) is 1.4 to 8 GHz.

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