A Novel Superstrate for Low RCS Antenna

Abstract

Superstrate implementation over the antenna is one of the techniques to reduce the antenna scattering. A novel design of superstrate consisting of periodic structure with varactor diode is presented to demonstrate the RCS reduction of patch antenna array. Radiation and scattering performance of two configurations of superstrate, viz. 2-layered and 3-layered are shown for both single patch and 4-element patch array. In each case, it is shown that significant RCSR is achieved over X-band without degrading VSWR and the antenna gain.