Bidirectional dual-circular-polarization folding transmission array antenna

Abstract

The invention relates to a bidirectional dual-circularly-polarized folded transmission array antenna, which is composed of an upper layer of circularly-polarized transflective selective total-space chiral metasurface and a lower layer of circularly-polarized transflective selective total-space chiral metasurface integrated with a planar feed source antenna, and the metasurface is composed of a square array formed by periodically arranging a plurality of metasurface units. The feed source antenna metasurface unit is composed of a planar circular polarization microstrip patch antenna, the metasurface unit comprises three layers of metal structures and two layers of dielectric substrates clamped among the metal structures, the upper metal layer and the bottom metal layer are composed of circular microstrip patch structures of the circular polarization microstrip antenna, the middle metal layer is a metal floor with a hole in the center, and the middle metal layer is a metal substrate with a hole in the center. Metalized via holes for connecting the upper metal layer and the lower metal layer pass through the through holes; the upper-layer metasurface enables right-handed original planned waves incident in the + z direction to be transmitted and reflects left-handed circularly polarized waves. The lower-layer metasurface enables left-hand circularly polarized waves incident in the-z direction to be transmitted and reflects right-hand circularly polarized waves.

Description

technical field [0001] The invention belongs to the technical fields of microwave and radio frequency, and mainly relates to a bidirectional double circularly polarized folded transmission array antenna, in particular to a bidirectional high directional radiation characteristic composed of a pair of circularly polarized transflective selective full-space chiral metasurfaces folded transmissive array antenna. Background technique [0002] In modern wireless communication systems, antennas with bidirectional radiation patterns are often used in microwave sensor networks, broadcast relay base stations and other scenarios. For most of these application scenarios, generally only a low-gain antenna with a broadside radiation pattern is required. For those antennas that work in long-distance, narrow and enclosed spaces, such as tunnel and mine communication, long-distance point-to-point communication, satellite relay communication, etc., high-gain antennas with highly directional ...

AI Technical Summary

Problems solved by technology

However, in the more classic folded reflectarray or folded transmissive array antenna structure, a structure containing a closed metal backplane is used to achieve the function of high-efficiency total reflection, which fundamentally greatly limits the two-way performance of this type of antenna. Potential application on radiation, radiation function cannot be realized on the side containing the metal backplane

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