Dual Circular Polarizations Generated by Self-Polarizing Fabry–Pérot Cavity Antenna With Loaded Polarizer
Yuanlong Li, Kwai‐Man Luk
Abstract
This communication presents a Fabry–Pérot cavity antenna with a thin polarizer loaded inside the cavity. The antenna is excited by a linearly polarized magneto-electric dipole. To realize self-circular-polarizing characteristics, a polarizer with the meander line is placed between the partially reflective surface and the reflective ground plane. Sharing the same radiating aperture, left-hand circularly polarized (LHCP) and right-hand circularly polarized (RHCP) waves can be generated by separate input ports. After analyzing the mechanism of the circular polarization, simulation and measurement are carried out to verify the proposed design. The operating bandwidth is 4%, from 27.4 to 28.5 GHz, covering fifth-generation (5G) 28 GHz band. The peak gain is 16.85 and 17.20 dBi for LHCP and RHCP, respectively.