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Dual-band polarization converter based on reflective metamaterial at microwave frequencies

We propose the design and simulation of a dual-band reflective polarization converter in the microwave region based on multiple resonances. An ultra-thin broadband polarization conversion composing of arrays of electric-field-coupled (ELC) resonator, a dielectric layer and a continuous metallic layer is further demonstrated numerically. The proposed converter can rotate the linearly polarized (LP) waves to its cross-polarized ones at resonant frequencies of 8.9 GHz and 14.8 GHz. Also, it can convert LP waves to circularly polarized waves at other two frequencies. The simulated results demonstrate that the bandwidth of polarization conversion ratio (PCR) over 50% can be achieved from 8.2 GHz to 16.7 GHz. And the maximum polarization conversion efficiency is nearly 100% at the two resonant frequencies. What's more, the proposed converter can maintain the polarization conversion performance with incident angle up to 30°.