中文摘要：

采用电流密度卷积FDTD算法（JEC—FDTD）计算了等离子体天线的散射特性，分析了等离子体天线处于工作状态时等离子体参数（密度、碰撞频率）及天线外部约束腔体对天线雷达散射截面（RCS）的影响．数值结果表明，等离子体天线的RCS会随等离子体密度的减小及碰撞频率的增大而减小．而约束腔体只有在高频段时才会对等离子体天线的RCS值产生较大的影响．因此，在不影响天线性能的情况下，可以根据信号频率调节等离子体参数、选取合适的腔体材料以达到增强等离子体天线隐身性能的目的．

英文摘要：

The paper has founded the 2D model of plasma antenna and JE convolution Finite- Difference Time-Domain （JEC-FDTD） algorithm is applied to the study on the antenna scattering characteristics based on the model. The effects of plasma density, collision frequency and glass tube on the Radar Cross Section （RCS） of the plasma antenna were analyzed in the paper. Analysis results show that RCS of plasma antenna can greatly decrease with the collision frequency increasing and plasma density decreasing. On the other hand, when the plasma antenna work at high frequency, the glass tube also has impact on the antenna scattering characteristics. Accordingly, increase in thickness of glass tube and enlargement of permittivity of glass will make RCS of the antenna decrease. So the stealth performance of plasma antenna can be improved by choosing the suitable plasma parameter and materials of glass tube based on the work frequency.