频率选择表面(FSS)在天线隐身技术中的应用

Frequency Selective Surface in Application to Antenna Stealth Technique

本文简要叙述了飞行器隐身技术中通常采用的三种方法。飞行器采取上述隐身技术措施后,机载雷达天线对电磁波的散射成为飞行器的主要散射源。因此,天线隐身技术的研究就显得十分重要。本文介绍的频率选择表面(FSS)是一种由无源谐振单元,按一定排列方式组成的准二维平面周期结构,利用其对电磁波具有频率及极化的双重滤波的概念,以达到降低天线雷达截面积(RCS)的效果。文中用谱域分析法对十字形振子阵FSS的特性进行了分析计算,并应用于天线罩或低RCS反射面天线中。对已加工出的面积为42×42cm^2,在聚四氟乙烯玻璃纤维布上的十字形振子阵FSS样品进行了性能测试,从测试曲线看出方法是有效的。

This paper briefly presents three generally used methods in the aircraft stealth technique. When previous methods of stealth technique was adoped, the radar antenna of the aircraft becomes a principal scattering source.'Therefore, the research of the antenna stealth technique is important. The Frequency Selective Surface (FSS) introduced in the paper is a quasi-two-demensional plane periodic structure in which the passive resonnant elements are arrangel in certain order. Since it possesses a dual filter concept of frequency and polarization for electromagnetic wave,the Radar Cross Section (RCS) of the antenna is reduced. The FSS of cross dipoles has been analysed and calculated by the Spectral-Domain approach and applied to the antenna radome or low RCS reflector antenna. The sample features of FSS of cross dipoles,which are made of F-4 glass fibre of 42×42cm2,have been measured. This method is effective as seen from the measured curves.