Design and Experimental Analysis of Dual-Band Polarization Converting Metasurface

Design and analysis of a dual-band polarization converting metasurface is presented in this letter. The proposed converter, which consists of two square split ring resonators, exhibits peak resonances at frequencies of 5.6, 7.3, 8.8, 15.1, and 15.9 GHz. The surface behaves as a polarization converter for linearly polarized incident waves in two frequency ranges, i.e., 5.4-9.0 GHz with a polarization conversion ratio (PCR) $\geq$ 93$\%$, and 14.6-16.1 GHz with a PCR $\geq$ 99$\%$). The size and thickness of the unit cell are, respectively, $0.126\lambda _{\mathrm{o}}$ and $0.057\lambda _{\mathrm{o}}$, where $\lambda _{\mathrm{o}}$ is the largest wavelength (corresponding to the lower frequency). The mechanism of polarization conversion is studied by examining the surface currents for all the resonance frequencies. Both simulated and experimental results reveals that the polarization converter can be utilized in C-, X- and Ku-band applications.