Reflective Type Linear to Circular Polarization Converter Using Metasurface Over a Wide Frequency Band

In this article, a metasurface based reflective type linear to circular polarization (LCP) converter has been presented. The metasurface structure is an array of unit cells. Unit cell of the proposed structure consists two diagonally placed metallic ring of quadrant shape on the top metal backed dielectric (Roggers 5880). The proposed LCP converter converts the linearly polarized (TEmode or Y-Polarized) incident EM wave to the RHCP reflected EM wave and TM linearly polarized incident wave into LHCP reflected EM wave. The LCPC operates over two different frequency bands from 27 GHz – 28 GHz and 36 GHz – 45GHz. The 3 dB axial ratio bandwidth (ARBW) of the LCP converter for the upper band is 34.23% with respect to the centre frequency in the operating frequency band. Both the bands cover a very large frequency band of 5G communication. The structure shows same response for TE and TM mode. This metasurface based reflective type LCPC finds application in up-linking and down-linking of radio waves communication, Aerospace communication, sensor and high datarate mobile communication for 5G.