基于FDTD方法的等离子体天线参数的数值计算

Calculation of plasma antenna's parameter using FDTD method

利用时域有限差分法(FDTD)计算了柱状等离子体天线的辐射方向图,输入阻抗和辐射效率等重要参数,并且和金属天线进行比较.通过计算分析,表明等离子体天线的辐射方向图,输入阻抗,辐射效率会随着等离子体密度、碰撞频率等参数的变化而变化.一定条件下,等离子体天线可以取代金属天线,同时保留了辐射方向可控、快速开关等特点.计算结果对于等离子体天线的设计具有重要的参考价值.

Plasma antenna with cylindrical configuration is analyzed by a straightforward application of the finitedifference time-domain （FD-TD） method. The computed results of the antenna, including radiation pattern, input impedance and radiation efficiency, are shown compared with metallic antenna. The result shows that these quantities vary with the parameters of plasma including plasma electric density and collision frequency. Plasma antenna can replace metallic antenna with the advantages of reconfigurability and invisibility. It is meaningful and instructional for the optimization of the plasma antenna design.