Design and implementation of a novel rasorber for aircraft stealth applications

A novel rasorber based on frequency selective surfaces (FSS) for dual functions operating as stealthy FSS radome for an antenna operating at 3.7 GHz with RF transparency bandwidth of 400 MHz and also as a thin capacitive circuit radar absorber in X band with Radar Cross Section Reduction (RCSR) of 10 dB (minimum) is described. The conducting backplane of rasorber is modified by using a metallic Jerusalem cross slot FSS, which is designed to function as conducting ground plane in the radar absorber frequency range and also to function as radome with band pass spatial filtering properties in the antenna radiating band.