一些低损耗介质圆柱双站RCS的矩量法分析

Analyzing of the Bistatic RCS for Cylinders Filling with Some Low Loss Dielectric Materials by MOM

用矩量法对一些用于天线罩、电磁兼容设计的低损耗介电材料填充的无限长介质圆柱在 TM波照射下的双站RCS进行了数值计算。仿真结果表明 ,相对于设计要求而言 ,低介电常数低损耗材料仍存在较明显的散射。散射与圆柱的电直径 ka0 的关系是 :ka0 较小时介电常数的实部 ε′起主要作用 ,ka0 较大时介电常数的实部和虚部共同起作用。散射与双站角的关系是 :双站角为 0时散射最强 ,随着双站角的增大散射迅速减弱。

The paper analyzes the bistatic RCS of some dielectric cylinders filling with lower loss material which is used in radome and electromagnetic compatibility design, in incidence of TM plane wave by the moment methods. The results show that small permittivity and lower loss material scatter obviously, comparing with the requirement. The relation of the scatter with the electrical diameter( ka 0 ) is that the real of the permittivity is principal when ka 0 is small, the real and imaginary of the permittivity work together following ka 0 increasing. The relation of the scatter with the bistatic angle is that the scatter is the biggest when the bistatic angle is zero and drops quickly following the bistatic angle increasing.