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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 co

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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

Examples

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Example Embodiment

[0039] Example one

[0040] The dielectric substrate used in this embodiment is a polytetrafluoroethylene (F4BM) material with a relative dielectric constant 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°, and a single sector The area of ​​the radiation patch is approximately 0.324 square of the waveguide wavelength.

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

[0042]

[0043] Mode LD: The coaxial probe 12 is fed, the switches 18, 21 are on, the switches 19, 20, 22 and 23 are off, the radiation pattern is biased to the direction of phi=164°, and the angle of the normal direction of the offset unit theta=30° , The maximum radiation gain is 7.2dBi, the 3dB beam coverage is on the phi=164° plane, theta is from -10.2° to 60.0°, the center frequency is 5.3GHz, and the -10dB bandwidth range is 5.147-5.4...

Example Embodiment

[0048] Example two

[0049] This embodiment provides a directional pattern reconfigurable linear phased array, and its structure diagram is as Figure 5 As shown, in order to deviate the radiation pattern of the reconfigurable antenna unit toward the XOZ plane or the YOZ plane, the antenna described in the first embodiment is rotated 32° counterclockwise, and the antenna is used as a unit antenna; the feeding structure of this embodiment adopts Coaxial feeding replaces the above-mentioned feeding network. In order to achieve good matching, the feeding probe needs to deviate a certain distance from the edge point of the sector patch. The structure of the antenna unit is as Image 6 As shown, the three-dimensional radiation pattern of its S parameter and resonance frequency point is 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 per...

Example Embodiment

[0053] Example three

[0054] This embodiment provides a plane two-dimensional phased array with a pattern of reconfigurable directional pattern, and its structure diagram is as Picture 9 As shown, the antenna unit adopts the antenna unit described in the second embodiment, and also adopts coaxial feeding; the unit antennas are arranged in 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 dielectric constant of 4.4; it can be achieved by controlling the working mode of the reconfigurable unit in the array Two-dimensional large-angle scanning of XOZ and YOZ planes.

[0055] When the units of the planar two-dimensional array are in the RD mode, the angle scanning in the negative half plane of YOZ can be realized, and the S parameter corresponding to the angle sc...

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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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