m=0角向模表面波等离子体柱天线辐射特性

根据表面波在非磁化等离子体柱中的色散关系，理论计算得到存在电子-中性原子碰撞、径向与轴向等离子体密度非均匀分布条件下m=0角向模表面波波矢实部与虚部随信号频率、等离子体密度的变化关系.然后利用波矢的实部与虚部、等离子体柱天线表面指数分布电流模型、等离子体阻抗，推导得到等离子体柱天线的辐射方向图随信号频率、等离子体密度的变化关系；最大增益、天线辐射阻抗随信号频率的变化关系；天线径向能量辐射随等离子体密度的变化关系.理论计算结果表明等离子体柱天线辐射方向图随信号频率、等离子体密度的改变而变化非常明显，信号频率对最大增益、天线辐射阻抗的影响显著；同时，这些理论计算结果与他人实验实测结果吻合，这对于设计高精度要求的等离子体天线提供了重要的理论参考价值.

Radiation Characteristic for the m=0 Azimuthally Mode Surface Wave Plasma Column Antenna

Application such as aircraft stealth,ionospheric communication based on the plasma electromagnetic scattering theory has drawn deep attention from plasma technology field.A detailed theoretical analysis of plasma Column antenna radiation characteristic which also based on such plasma electromagnetic scattering theory is presented.According to the azimuthally symmetric surface wave dispersion relation in the non-magnetized plasma column with presence of electron-neutral atom collisions and non-uniform plasma densities both radial and axial,the complex surface wave-vector with real and imaginary parts is studied as function of signal frequency and plasma density.Together with wave-vector,exponential distribution of the plasma column surface current model,the plasma impedance,we derived the dependence of antenna radiation pattern,the largest antenna gain and radiation impedance on signal frequency,also the dependence of antenna radial energy radiation on the plasma density.The theoretical results show that the signal frequency and plasma density have great influence on antenna radiation pattern;the antenna radiation impedance and the maximum antenna gain change obviously with signal frequency,these theoretical results are in good agreement with the experimental measured results.