A corrugated surface with low backscatter

A low backscatter corrugated metal surface has been designed, fabricated, and tested for
H
-polarized transverse electromagnetic (TEM) incident waves. The problem has been formulated using the scattering matrix approach and reflection and transmission co-efficients at the fin-air interface are determined using an integral equation approach. Hence, an expression for monostatic radar cross section (RCS) is obtained. The RCS has been experimentally measured using a continous wave (CW) radar and good agreement has been obtained with theoretical results. The fin-corrugated surface gives a rather small return (35 dB down with respect to the flat conducting plate of same size) for incident angles up to
80.6\deg
when the period of corrugation a is in the range
\lambda/2 < a < \lambda
.