Ultra-Thin Broadband Transmission FSS for Linear Polarization Rotation

Frequency-selective surfaces (FSSs), have various applications in microwave electromagnetics. This paper reports a solution to the current FSS challenges of flexibly, low profile, simple fabrication and polarization control using novel structure operating across X Ku frequency bands where linearly polarized wave is rotated by 90°. The FSSs were fabricated laser engraving thin layer $5\mu \text{m}$ aluminum on $65~\mu Mylar substrate with relative permittivity 2.7, separated dielectric spacing 0.9 mm polypropylene substrate, 3. co cross-polarized reflection transmission response was investigated numerical modeling measured experimentally. A parametric study also conducted focusing key performance indicators, specifically bandwidth structure. novelty this rotation lies its ultra-thin profile ( $0.034~\lambda _{0}$ ), flexibility significant bandwidth. prototypes experimental results good agreement simulated results, −6 dB 61% −6dB 60%. Applications include antenna radomes particularly important, as well other filtering which require conformal