太赫兹科学与电子信息学报, 2016, 14 (4): 581, 网络出版: 2016-10-24
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
毫米波 全息天线 圆极化 相位调制 人工阻抗表面 millimeter-wave holographic antenna circularly polarized phase modulation 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.
李江, 杨春, 陈琦, 李波, 何晓阳. 基于人工阻抗表面的毫米波圆极化全息天线[J]. 太赫兹科学与电子信息学报, 2016, 14(4): 581. LI Jiang, YANG Chun, CHEN Qi, LI Bo, HE Xiaoyang. Millimeter-wave circularly polarized holographic antenna based on artificial impedance surface[J]. Journal of terahertz science and electronic information technology, 2016, 14(4): 581.