表面波激励等离子天线辐射方向图重构方法研究

Reconfiguration of Radiation Pattern of Surface-Wave Excited Plasma Antenna

基于Boltzmann方程和天线理论建立了表面波激励等离子天线辐射方向图重构模型。研究了等离子天线的色散关系,仿真分析了等离子体密度对波矢量的影响以及折射率对等离子天线辐射方向图的影响。搭建了表面波激励等离子天线试验系统,采用旋转天线测量法对等离子天线阵的辐射方向图进行了测量。仿真及实验结果表明:等离子天线辐射方向图重构模型可以用于等离子天线方向图重构特性的研究与分析,表面波激励等离子天线能够在外界激励信号的控制下实现辐射方向图的动态重构。

The reconfiguration of the radiation pattern of the surface wave excited plasma antenna was modeled on the basis of Bohzmann equation and antenna theory to fully understand the dispersion relation of the plasma. The impact of the plasma density on the wave vector and the dependence of the radiation pattern on the refractive index were simulated. The dedicated test platform was setup for the plasma antenna excited by monopole surface wave, and the radiation pattern of plasma antenna was evaluated in antenna rotating method. The simulated and experimental results show that the newly- developed model works rather well in evaluating the reconfiguration characteristics of the plasma antenna, and the plasma antenna excited by monopole surface wave is capable of realizing the dynamic reconfiguration of radiation pattern under the control of an external excitation source.