A wideband single-layered circular polarizer with centrosymmetric dual-loop elements

A wideband single-layered circular polarizer is presented. The centrosymmetric dual-loop unit cell is employed in the periodic structure. Numerical analysis are given to investigate the polarizer's working principle. The measured results validate the design and show that the 3dB axial ratio band covers from 19.3GHz~31.8GHz.