天线雷达散射截面的分析与实验

ANALYSIS AND EXPERIMENTS ON THE ANTENNAS’ SCATTERING

本文利用天线散射的基本原理，以波导激励振子抛物面天线为例，计算并分析了天线的结构项散射雷达截面ＲＣＳｓ和模式项散射雷达截面ＲＣＳｅ，给出了此天线雷达截面的预估值。实验结果表明，理论预估值与实测值吻合较好，并且证明天线的模项ＲＣＳｅ大于结构项ＲＣＳｓ，天线总的雷达截面主要受天线模式散射的影响，减小模式项ＲＣＳｅ将有效地降低天线的雷达截面。

The electromagnetic scattering by an antenna is composed of two parts, one is the common structural scattering component, another is the antenna-mode component, which is a special character of loaded scatters and produced by antenna's re radiation. The back-scattering cross section of a parabolic antenna is discussed, valued and experimented. The results indicate that the mode component of the antenna's scattering is much stronger than the structural component, and the antenna's RCS can be reduced signally by the method of reducing the mode component.