X-band Gamma-shaped anisotropic metasurface-based perfect cross-polarizer for RCS reduction

In this paper, an X-band perfect cross-polarization convertor (CPC) that consists of Gamma-shaped metal patch imprinted on a metal-backed FR-4 dielectric substrate is designed, analyzed, and characterized. The unit cell dimensions of the developed structure are optimized to achieve more than 99.9% polarization conversion ratio (PCR) for a frequency range of 8-12 GHz (X-band) at normal incidence angle. The performance of device exhibits 80% PCR value as a function of angle of incidence up to 40 degrees. The analytical finding and experimental characteristics of the designed structure agree well with the simulated results. In addition, the developed device has been thoroughly analyzed numerically for radar cross-section (RCS) reduction using phase cancellation techniques which exhibits 10-dB mono-static RCS reduction over a frequency band 7.7 GHz to 13.7 GHz. The developed device is highly suitable for radar stealth applications.