等离子体天线表面电流分布与辐射特性研究

内容简介：建立了表面波驱动等离子体天线装置,提出了一种等离子体天线表面电流指数分布模型,并利用该表面电流分布模型计算了天线的辐射方向图.研究结果表明,等离子体密度随轴向距离的增大呈指数衰减趋势.正常工作状态下表面波波矢虚部随等离子体密度的增大而下降,遵循与等离子体密度类似的指数衰减规律,但其实部则基本保持不变.等离子体天线的表面电流呈振幅指数衰减行波模式.利用该表面电流分布模型计算得到的辐射方向图呈现典型的8字形分布,与实验测量结果良好符合.当射频功率减小,等离子体天线辐射方向图宽化.

Abstract：A surface-wave driven plasma antenna has been built.An exponential model of the surface current distribution has been proposed to calculate the radiation pattern of the plasma antenna.The results show that the plasma density decreases exponentially with the axial length.The magnitude of the imaginary part of the surface wave vector shows similar exponentially decaying profile with the plasma density under normal conditions,while the real part of the wave vector remains almost constant.The surface current distribution shows a traveling wave mode with exponentially decaying magnitude.The calculated radiation pattern of a typical"8"figure fits the experimental values well using the proposed surface current distribution model.The radiation pattern is broadened when the input RF power decreases.

作者：吴振宇, 杨银堂, 汪家友,

关键词：等离子体天线, 表面电流分布, 方向图,