Broadband low-profile high-isolation dual-circular polarization two-dimensional wide-angle scanning sparse array

Abstract

The invention discloses a broadband low-profile high-isolation dual-circular polarization two-dimensional wide-angle scanning sparse array, and belongs to the technical field of microwave antennas. The sparse array is composed of periodically arranged dual-port antenna units, and activated antenna unit ports at different scanning angles are optimized through a genetic algorithm, so that the gain of a main wave beam of the sparse array during working is reduced by less than or equal to 0.5 dB compared with the gain of a main wave beam during full array. An SIW back cavity type structure is adopted in the antenna unit, a three-section coupling line directional coupler is adopted at the same time, and a second section of coupling line gap is a sawtooth-shaped gap. According to the dual-circular polarization sparse array, dual-circular polarization two-dimensional wide-angle scanning can be achieved, and the purpose of achieving the effect close to a full array can be achieved through a small number of T/R assemblies.

Description

technical field [0001] The invention belongs to the technical field of microwave antennas, and in particular relates to a wide-band low-profile high-isolation double-circular polarization two-dimensional wide-angle scanning sparse array. Background technique [0002] The antenna is the front end of the wireless communication system and is a device used to transmit or receive electromagnetic waves. In recent years, the development of communication technology has put forward higher requirements on the performance of antennas. The phased array antenna array composed of antenna units in a specific arrangement can obtain the deflection of the array beam by adding an appropriate phase shift (or delay) to each unit, and can realize fast beam scanning and multi-beam scanning and flexible beam pointing. In the field of satellite communications, linearly polarized antennas have problems of polarization mismatch, multipath interference, and Faraday rotation effects. Since circularly...

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Problems solved by technology

[0006] Literature "Circularly-Polarized Sparse Arrays Realized by Randomly-Rotated Linearly-Polarized Antennas" (Smolders A, Geluk S, Reniers A. Circularly-Polarized Sparse Arrays Realized by Randomly-Rotated Linearly-Polarized Antennas[J]. IEEE Antennas and Wireless Propagation Letters, 2016,16:736-739.) proposed a circularly polarized sparse array composed of linearly polarized antenna elements arranged in random rotation, which can achieve low sidelobes and low cross-polarization levels, but The array cannot achieve wide-angle scanning

[0007] At this stage, there are still relatively few studies on sparse arrays with dual circular polarization, and further research is needed on how to realize circularly polarized wide-angle scanning

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