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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.
A surface wave driven plasma antenna device was established and an exponential distribution model of the plasma antenna surface current was proposed and the radiation pattern of the antenna was calculated by the surface current distribution model.The results show that the plasma density varies with the axial distance Increases with an exponential decay tendency.When the normal working condition, the imaginary part of the surface wave declines with the increase of the plasma density and follows the exponential decay law similar to the plasma density, but the real part basically remains unchanged.Plasma antenna Of the surface current amplitude exponential decay traveling wave mode.The radiation pattern calculated by the surface current distribution model shows a typical figure-eight distribution, in good agreement with the experimental measurements.When the RF power decreases, the width of the plasma antenna radiation pattern The