Band pass radomes for reduced RCS

A frequency selective surface (FSS) comprising a square grid and a hexagonal array of discs is proposed as a means of reducing the radar cross section (RCS) of a radar bay over a wide (2 GHz to 14.6 GHz) frequency bandwidth. Results are presented in terms of transmission loss for an `A´ -type sandwich radome consisting of 2 FSS layers for normal and non-normal incidence. A single FSS layer on a GRP flat panel is also considered. Good agreement is found between the predicted and measured results. It is found that the proposed FSS is relatively insensitive to angles of incidence and polarisation between 3.8 GHz and 10.1 GHz. Parametric studies have indicated versatility of the proposed structure