Dual Circular Polarization Fabry-Perot Resonant Antennas Based on Meta-Surface

A dual circular polarization Fabry-Perot resonant antenna is proposed in this paper. The proposed antenna consists of a microstrip antenna radiator and meta-surface. Meta-surface is applied into the design of a Fabry-Perot (FP) resonant cavity for generating two circularly polarized (CP) beams. When the meta-surface functions as a partially reflecting surface with a top C-gaps array, dielectric substrate with holes periodically arranged around the atoms and bottom metal plate with strip gaps, the proposed design would split an LP wave from the feed into the left-hand CP and right-hand CP waves by rotating the top C-gaps to form prescribed phase gradients. Simulation and measurement results show that the proposed antenna is capable of generating left-hand CP and right-hand CP radiation beams pointing at 18 degrees and -18 degrees at 14.9 GHz with a stable gain of over 22.7 dBic and an aperture efficiency of 25.7%. The proposed technique offers an efficient way to fulfill FP resonant antennas with specific characteristics using meta-surface for more advanced functionalities.