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Directional diagram reconfigurable antenna and phased array thereof

A technology for reconstructing antennas and patterns, applied to antenna arrays, individually powered antenna arrays, antennas, etc., and can solve the problem of large frequency offset of the reconfigurable unit of the array antenna, low radiation gain of the array antenna unit, and phased array. The problem of high antenna array profile, to achieve the effect of easy processing and integration, high gain, and improved radiation gain

Active Publication Date: 2018-05-11
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The document "An Azimuth-Pattern-Reconfigurable Antenna with Enhanced Gain and Front-to-Back Ratio" discloses a reconfigurable antenna, which realizes four working modes by reconfiguring the feed network, and at the same time changes the artificial structure of the bottom layer of the dielectric substrate. The working unit can enhance the directivity and increase the radiation gain to varying degrees; however, the overall structure of the antenna is relatively complex, the size is large, the number of switches required is large, and the state of the control switches is relatively cumbersome
[0006] The document "Compact Pattern-Reconfigurable Monopole Antenna Using ParasiticStrips" discloses a pattern reconfigurable antenna, by changing the on and off states of each PIN diode, thereby changing the position or number of reflectors and directors, and then changing the antenna The radiation direction of the antenna deflects the radiation pattern in different directions to realize the radiation beam of eight modes in the azimuth plane; however, the antenna structure is a three-dimensional structure with large volume, poor matching performance, large center frequency offset, and external deflection circuit complex
[0007] The document "2-D Planar Wide-Angle Scanning Phased Array Based on Wide-BeamElements" discloses a phased array antenna, which uses the strong electromagnetic coupling effect between the radiation array and the parasitic layer, and reconstructs the pixel structure of the parasitic layer , change its current distribution, thereby widening the beam width of the array antenna unit, and realizing the two-dimensional large-angle scanning of the phased array antenna; but the profile of the phased array antenna array is high, the volume is large, and the radiation gain of the array antenna unit is low. The design of the parasitic layer is relatively complicated and needs to be realized through an optimization algorithm
[0008] The document "A Novel Wide-Angle Scanning Phased Array Based on Dual-ModePattern-Reconfigurable Elements" discloses a phased array antenna. By controlling the working mode of the reconfigurable elements, the phased array -81°—+81° can be realized One-dimensional large-angle scanning; but the frequency offset of different working modes of the array antenna reconfigurable unit is large, the radiation gain of the array antenna unit is low, and only one-dimensional scanning can be realized

Method used

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  • Directional diagram reconfigurable antenna and phased array thereof
  • Directional diagram reconfigurable antenna and phased array thereof
  • Directional diagram reconfigurable antenna and phased array thereof

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Embodiment 1

[0040] The dielectric substrate used in this embodiment is a polytetrafluoroethylene (F4BM) material with a relative permittivity of 4.4; the radius of the fan-shaped radiation patch is approximately equal to 0.7 waveguide wavelengths, and the angle of the fan-shaped radiation patch is 90°. The area of ​​the radiating patch is approximately 0.324 waveguide wavelengths squared.

[0041] The feed ports of the four working modes of the antenna described in this embodiment are shown in the following table:

[0042]

[0043] Mode LD: Coaxial probe 12 feeds power, switches 18 and 21 are turned on, switches 19, 20, 22 and 23 are turned off, the radiation pattern is biased to the direction of phi=164°, and the angle theta=30° to the normal direction of the offset unit , the maximum radiation gain is 7.2dBi, the 3dB beam coverage range is in the phi=164° plane, theta is from -10.2° to 60.0°, the center frequency is 5.3GHz, and the -10dB bandwidth range is 5.147-5.417GHz;

[0044] M...

Embodiment 2

[0049] This embodiment provides a linear phased array with a reconfigurable pattern, and its structural schematic diagram is as follows Figure 5 As shown, in order to bias the radiation pattern of the reconfigurable antenna unit toward the XOZ plane or the YOZ plane, the antenna described in Embodiment 1 is rotated 32° counterclockwise, and this antenna is used as a unit antenna; the feeding structure of this embodiment adopts The coaxial feed replaces the above feed network. In order to achieve a good match, the feed probe needs to deviate from the edge point of the fan-shaped patch for a certain distance. The structure of the antenna unit is as follows: Figure 6 As shown, the three-dimensional radiation pattern of its S parameter and resonance frequency point is shown as Figure 7 shown. It can be seen from the figure that the radiation patterns of the four modes LU, LD, RU, and RD of the antenna unit deviate from the normal direction by 30°, and have good matching perfor...

Embodiment 3

[0054] This embodiment provides a planar two-dimensional phased array with a reconfigurable pattern, and its structural diagram is as follows Figure 9 As shown, the antenna unit adopts the antenna unit described in Embodiment 2, and also adopts coaxial feeding; the unit antennas are arranged into a 5×5 two-dimensional array, and the interval between the unit antennas is about 0.71 wavelengths. The edge spacing between the antennas is about 0.035 wavelengths; the dielectric substrate used in this embodiment is a polytetrafluoroethylene (F4BM) material with a relative permittivity of 4.4; by controlling the working mode of the reconfigurable unit in the array, it can be realized Two-dimensional large-angle scanning of the XOZ and YOZ planes.

[0055] When the units of the planar two-dimensional array are in the RD mode, it can realize angular scanning in the negative half plane of YOZ, and the S parameters corresponding to the angular scanning range and the maximum scanning ang...

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Abstract

The invention discloses a directional diagram reconfigurable antenna and a phased array thereof, and belongs to the technical field of a microwave antenna. The directional diagram reconfigurable antenna is proposed based on slotted fan-shaped patches; through reconfiguration of a feeding network, radiation directional diagrams of four kinds of modes can be realized, and wave beam scanning on the azimuth plane is realized; by performing reasonable arraying through the directional diagram reconfigurable antenna, one-dimensional and two-dimensional large-angle wave beam scanning of the directional diagram on the pitching plane can be realized. The directional diagram reconfigurable antenna is simple and creative in structure, convenient to array, and can be widely applied to the fields of mobile communication, satellite communication, radar and the like.

Description

technical field [0001] The invention belongs to the technical field of microwave antennas, and in particular relates to a reconfigurable antenna with a pattern and a phased array thereof. Background technique [0002] The phased array antenna has the characteristics of fast beam scanning, which makes it irreplaceable in the fields of radar detection and satellite communication. However, the equipment of the phased array antenna system is complicated, and the scanning range of the currently commonly used phased array antenna is limited, usually within ±50°. If it is necessary to realize all-round space detection, the system needs to be equipped with multiple array antennas, which increases the post-processing complexity and engineering cost of the phased array system. Therefore, planar phased array antennas with large-angle scanning characteristics have become a research hotspot in the field of phased array antennas. [0003] The concept of reconfigurable antenna was first ...

Claims

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Application Information

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IPC IPC(8): H01Q1/38H01Q1/50H01Q3/24H01Q9/04H01Q21/00H01Q21/06H01Q21/08
CPCH01Q1/38H01Q1/50H01Q3/247H01Q9/045H01Q21/0006H01Q21/065H01Q21/08
Inventor 杨雪松聂念胜王秉中
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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