A novel ultra wide band radar absorber with reduced thickness for circular polarization

A novel Ultra Wide Band (UWB) dielectric Radar Absorber (RA) with weight and thickness constraints is presented in this paper. Radar reflectivity of - 10 dB (minimum) is realized in the frequency band from 2 GHz. to 32 GHz, for normal incidence. The panel type RA comprises four lossy frequency selective surface (FSS) layers, each based on circular patches in skewed grid lattice backed by RF transparent dielectric spacers finally backed by the conducting plane which needs to be shielded. The UWB panel RA is extensively analyzed in full wave simulation software and the assembled panel RA is tested for its absorption in microwave anechoic chamber to verify the design and simulation. The size of the prototype RA is (255 × 255) mm and the weight is 260 gm. The UWB RA finds application in aircraft/UAV stealth.