High-gain dual-frequency circularly polarized antenna based on metasurface

Abstract

The invention discloses a high-gain dual-frequency circularly polarized antenna based on a metasurface. The working frequency bands are a K wave band and a Ka wave band. A metal layer of the antenna comprises a micro-strip ring feeder line, a grounding plane with a cross slot and a metasurface. The micro-strip ring feeder line at the lowest position is coupled with the slotted grounding plane at the middle position. The electromagnetic wave energy is coupled to the metasurface of the uppermost layer and is radiated out. The sequential rotation structure of the micro-strip ring feeder line cangenerate a phase difference of 90 degrees so as to excite circular polarization. According to the feed structure, a wide axial ratio bandwidth can be realized; the metasurface can influence the axialratio bandwidth and gain of high and low frequency bands; the gain of the antenna in two frequency bands is greater than 5dBic; and the single-port feed dual-frequency circularly polarized antenna hasgood radiation characteristics in two frequency band bands, and is compact in structure and easy to process, so that antenna has a good application prospect in a wireless communication system.

Description

technical field [0001] The invention belongs to the technical fields of optics / microwave, wireless communication and test simulation, and in particular relates to a metasurface-based high-gain dual-frequency circularly polarized antenna. Background technique [0002] With the progress of the society, the communication information service continues to develop. In order to improve the communication rate of the communication system, the current communication frequency band is increasingly developing towards the high frequency band, especially in the K and Ka bands. Working in these two frequency bands requires antennas to be small in size, Gain and other related characteristics. Due to some problems such as electromagnetic compatibility, people usually hope that an antenna can "integrate" multiple operating frequency bands, so that the same antenna can be shared in many cases. Therefore, the dual-frequency or even multi-frequency circular polarization technology of the antenna...

AI Technical Summary

Problems solved by technology

Lens reflector antennas are similar. Usually, feeders are used to irradiate dielectric spheres, dielectric cakes, etc. to focus the beam and achieve high-gain irradiation. However, like reflector antennas, the size of the antenna is too large to achieve beam adjustment.

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