Compact Single Layer Enhanced Capacitance Loaded Modified Jerusalem Cross FSS For Dual-Band Orthogonal Linear to Circular Conversion

This paper presents a capacitance-loaded single-layer frequency selective metasurface for dual-band orthogonal linear-to-circular polarization conversion. The proposed unit cell features a modified Jerusalem cross with a connected square ring fabricated on a Taconic TLY-5 substrate. The design achieves right-handed circular polarization in Ku band (13.31-15.5 GHz) and left-handed circular polarization in Ka band (26.82-27.9 GHz) with axial ratios below 3 dB. The structure demonstrates stability up to 40° in the xz plane and 35° in the yz plane. The design evolution of structure and its analysis based on surface current and Stokes parameters are also presented to validate simulation results.