Low-loss terahertz reflective array antenna based on liquid crystal regulation medium metasurface

Abstract

The invention discloses a low-loss terahertz reflective array antenna based on a liquid crystal regulation medium metasurface, the reflective array antenna is characterized in that the liquid crystal regulation medium metasurface is formed by a plurality of array units, and the resonant structure of each array unit is a double-layer high-dielectric-constant dielectric cylinder; each array unit sequentially comprises an upper dielectric substrate, an upper metal gate, an upper dielectric cylinder, a liquid crystal, a lower dielectric cylinder, a lower metal gate, a lower dielectric substrate and a metal reflecting layer from top to bottom; when an electromagnetic wave enters, a dipole resonance mode is excited in the upper dielectric cylinder and the lower dielectric cylinder, so that a reflection phase is abruptly changed; the molecular deflection direction of the liquid crystal is adjusted through voltage applied to the upper metal gate and the lower metal gate, the relative dielectric constant of the liquid crystal between the dielectric cylinders changes, the resonant frequency of the array unit shifts, and the reflection phase changes, so that the amplitude and the phase of the reflection electromagnetic wave are regulated and controlled. According to the invention, the real-time regulation and control of the reflection phase and the low-loss dynamic scanning of the terahertz reflection beam are realized.

Description

Low-loss Terahertz Reflect Array Antenna Based on Liquid Crystal Controlled Dielectric Metasurface technical field The invention belongs to the technical field of electromagnetic wave metamaterials, particularly a kind of low-temperature control medium metasurface based on liquid crystal. Loss terahertz reflect array antenna. Background technique [0002] The beam scanning antenna has a wide range of applications in the fields of communication, detection and imaging. The parabolic antenna technology and phase Array antenna technology is an effective method to achieve beam scanning. The parabolic reflective antenna has a simple structure and uses a mechanically rotating The method realizes the dynamic scanning of electromagnetic waves, but the scanning speed is slow and the volume is large. Phased array antennas can be divided into two types: Source Phased Array and Passive Phased Array. Each transmitting unit of the active phased array antenna is loaded with TR comp...

AI Technical Summary

Problems solved by technology

In 2018, Yin Zhiping's research group at Hefei University of Technology used a single dipole slotted unit to achieve a phase shift of 306° in the 124.5GHz band. In 2019, Meng Fanyi's research group at Harbin Institute of Technology used a three-dipole resonant unit. In the 105GHz band, the phase shift is greater than 360°. These two designs are based on the improvement of the work of Robert Cahill's research group, but the reflection coefficient is still around 0.1.

In summary, the existing reflectarray antennas based on liquid crystal-controlled metal metasurfaces have the problem of large loss in the THz band.

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