Re-Configurable Bi-Functional Meta-Surface Based Polarization Converter

In this paper, a re-configurable bi-functional meta-surface for polarization conversion is designed and verified. The structure consists of a split ring resonator (SRR) with metal strips on the middle of each side. To make it re-configurable PIN diodes are incorporated. The proposed meta-surface offers a dual function in the OFF state of PIN diodes. It functions as linear to linear polarization converter over the frequency range 4.92GHz to 7.06GHz and a linear to circular polarization converter over the frequency range 8.4GHz to 9.4GHz. In the ON state, it functions as a metal reflector. The bias lines for the RF switches are also included in the structure. An axial ratio (AR) of below 3dB is obtained for an incident angle uptill 10°. A PCR value of 1 is also obtained up to the incident angle of 10°.