Circularly Polarized Fabry–Perot Resonant Cavity based on Frequency Selective Surface

This paper designs a circularly polarized Fabry-Perot antenna based on FSS loading. The FSS is composed of a dielectric substrate and two printed metal layers, which are etched on the top and bottom layers of the substrate. The two metal layers are composed of a patch layer and a square loop slot layer. The partially reflecting surface is composed of 8×8 FSS units, and is placed at a distance h from the feed. And the overall size of the proposed CP F-P antenna designed in this paper is about 1.5λ
₀
× 1.5λ
₀
× 0.5λ
₀
. The actual measured impedance bandwidth is 22.2%, the axial ratio bandwidth is 4.3%, and the maximum gain is 10.4 dB.