Dual-circularly-polarized millimeter wave reflection array antenna with independently controllable beams

Abstract

The invention discloses a dual-circularly-polarized millimeter wave reflection array antenna with independently controllable beams, which comprises a broadband circularly-polarized feed horn antenna (1) and a planar reflection array (2). The broadband circularly-polarized feed horn antenna (1) is located near the focal plane of the planar reflection array (2). The planar reflection array (2) is composed of sub-wavelength dual-circularly-polarized phase shifting elements (3) arranged periodically. Each dual-circularly-polarized phase shifting unit (3) contains four metal layers, wherein a firstlayer is a metal patch (3a), a second layer is a metal floor (3c) with two H-shaped slots (3b), a third layer is composed of two metal micro-strip transmission lines (3d) of different lengths, and afourth layer is a metal base plate (3e). The antenna can realize dual-circularly-polarized highly-directional beams, can independently control the beam directions of left-hand circularly-polarized waves and right-hand circularly-polarized waves, and has a broad application prospect in wireless communication and satellite communication.

Description

technical field [0001] The invention belongs to the field of electronic devices of wireless communication systems, and in particular relates to a dual circularly polarized millimeter-wave reflection array antenna with independently controllable beams. Background technique [0002] A reflectarray antenna is an electromagnetic wave radiation device that can generate a high-gain beam or a shaped beam, and it is widely used in various wireless communication and satellite communication systems. Unlike traditional parabolic reflector antennas, the beamforming of reflectarray antennas does not depend on the difference in wave path difference, but is based on the phase shift provided by its subwavelength resonant or non-resonant elements, so it can be achieved through a lightweight, low-loss planar structure Achieve high-gain directional or shaped beams. The phase shifting methods of the reflectarray are mainly divided into dynamic phase and rotational phase. Based on these two ph...

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Problems solved by technology

Due to the use of multiple functional layers, the thickness of the dual circularly polarized reflectarray designed by these two methods is close to or even exceeds one wavelength, and the bandwidth is very narrow, and the 1dB gain and axial ratio <2dB bandwidth is less than 7%

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