Wideband reflecting frequency‐selective surface polarizer for X‐band applications

Abstract

SummaryThis paper proposed the design of a broadband linear‐to‐circular reflecting polarizer for X‐band applications. The polarizer is designed with three‐arm dipole‐shaped unit cells with a full ground plane to get wideband performance. The incident linear polarized wave is converted to a right‐handed circularly polarized wave upon reflection from the polarizer. The footprint of the unit cell is 9 × 9 mm, which is printed on a FR‐4 substrate. Fabricated prototype is measured for its performances like polarization conversion ratio (PCR), fractional bandwidth, and aperture efficiency. The PCR is about 97%, and the fractional bandwidth is 64% with the aperture efficiency of more than 80%. Polarizer performance is analyzed in transverse electric and transverse magnetic modes, and they are stable up to 40° of various incident angles. The polarizer exhibits the 3‐dB axial ratio bandwidth from 8 to 12 GHz, which is suitable for satellite applications.