Grounded L-Shaped Corner-Embraced Patch Array Polarization Conversion Metasurface Compatible with Multiband and Broadband Characteristics

We propose a linear polarization rotator metasurface composed of a grounded array of L-shaped corner-embraced patches. Both simulation and experimental results confirm that the metasurface achieves a polarization conversion ratio exceeding 90% across four distinct frequency bands: 5.7–6.2 GHz, 7.0–8.7 GHz, 11.2–13.9 GHz, and 16.7–18.0 GHz, with near-unity conversion efficiency at four resonance points. Furthermore, the metasurface demonstrates effective polarization conversion over an ultra-wide frequency range from 5.5 to 18.1 GHz. The combination of multiband and broadband characteristics makes this design highly valuable for advanced applications in complex electromagnetic environments, including multifunctional radar systems requiring multiband capabilities and wireless communication systems demanding ultra-wideband performance.