Dual Split Ring Resonator Based Reconfigurable Reflective Metasurface for Linear-to-Linear Polarization Conversion

A metasurface that can be reconfigured for the conversion of linear -to -linear polarization has been designed, fabricated, and verified. It consists of dual co -centric split -ring resonators (SRRs), each of which has a pair of splits. It is specifically engineered to function in two reflection modes, one with polarization conversion and the other without. The unit cell achieves reconfiguration by utilizing two PIN diodes. Conversion of linear polarization to its perpendicular counterpart is achieved while the diodes are in the OFF state. When the PIN diodes are turned ON, full reflection without polarization conversion occurs. The proposed meta -surface operates over the 6.03-10.5 GHz frequency range. A 42 x 42 unit cell array is fabricated, and the results are experimentally verified. An FR4 substrate is used with copper ground plane on one side. The polarization conversion is measured and compared with simulation results for various incident angles. A Polarization Conversion Ratio (PCR) of >= 90% is achieved for incident angles up to 30, with simulation and measured results showing good agreement.