45° Angle Insensitive Reflective Multi-polarization Converter for Microwave Bands

In this paper, we propose a wide-angle insensitive multi-polarization converter based on reflective metasurface, using split-ring-resonators (SRRs) and cross oscillators structures. The simulated results indicate that nearly 100% polarization conversion ratio (PCR) can be achieved at three resonant frequencies, 5.1 GHz, 6.6 GHz and 7.42 GHz, and the axial ratio (AR) is less than 3 dB in 4.79-5GHz, 5.24-6.27 GHz and 6.93-7.35 GHz (4.29%, 17.9% and 5.88% fractional bandwidth). Linear to linear (LTL) or linear to circular (LTC) polarization conversion will not be affected when the incidence angle is tilted by 45° under both y- and x-polarized. With the advantages of multi-polarization conversion, wide-angle insensitivity and multi-frequency, our proposed model has potential application in future microwave wireless power transmission (MWPT) polarization manipulation.