Linear-to-linear polarization conversion using metasurface for X, Ku and K band applications

Ultra thin wideband metasurface polarization converter is presented in this paper. The proposed structure is used for linear conversion i.e., X polarized to Y polarized and vice versa. The design of the structure consists of stair case shaped and is fabricated on FR-4 substrate having overall dimension of 3 mm x 3 mm. The Polarization Conversion Ratio (PCR) obtained is wideband having bandwidth of 10.81 GHz (10.57-21.38 GHz) above 89%. Two distinct peaks are observed in the range of interest having frequencies at 11.66 and 18.13 GHz with maximum magnitude of 99.30 and 99.90%. These two peaks occur due to plasmonic resonance. At these two peaks, surface current distribution is plotted to explain the wideband response from the structure. The structure is simulated using commercially available ANSYS HFSS 19.1 and measured inside an anechoic chamber with the help of Vector Network Analyser (VNA). The proposed structure find applications for X (8-12 GHz), Ku (18-21 GHz) and K (21-27 GHz) band. At last the structure is measured with already reported polarization converters and find practical applications for frequency reconfigurable antennas, linearly conversion of incident waves, etc.