基于人工阻抗表面的毫米波圆极化全息天线

Millimeter-wave circularly polarized holographic antenna based on artificial impedance surface

摘要:

基于全息光学原理，提出并设计了一种加载相位调制的毫米波圆极化全息天线，天线由电小尺寸的人工阻抗单元按表面阻抗分布参数排列而成。利用横向谐振技术分析了标量人工阻抗单元表面阻抗的计算方法，建立了单元尺寸与表面阻抗之间的数据库。给出了干涉表面的阻抗分布参数计算方法，通过加载相位调制，实现了全息天线的圆极化。利用Matlab-HFSS联合建模仿真，建立了毫米波圆极化全息天线的基本模型，仿真结果表明，天线工作于35 GHz，波束沿法向偏转35°，中心的轴比小于1.5 dB。

Abstract:

A novel circularly polarized holographic antenna is proposed at 35 GHz based on optical holographic principle. The antenna is composed by sources and an interference plane which is based on quasi-periodically artificial impedance surface. The surface impedance of scalar artificial impedance surface is analyzed by transverse resonance technique. In order to achieve circular polarization, a phase modulation is introduced into the function of the interference plane impedance. The antenna radiates circularly polarized wave from linearly feed. As an example, a circularly polarized holographic antenna is simulated. The results indicate that the beam deflects 35° along z axis, and the axial ratio is below 1.5 dB at 35 GHz center frequency.