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 × 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.

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This article present wideband Metamaterial Cross Polarizer (MCP) structure for C and X band applications. The proposed structure consists of wheel shaped associated with meander line and triangular shaped patches having overall dimension of 18 × 18 mm. The anisotropic design patchis a single metallic layer (Cu) placed at the top of dielectric substrate FR-4 and backed by a ground also consists of metal layer (Cu). A wideband Polarization Conversion Ratio (PCR) above 0.8 magnitudes is achieved having bandwidth of 8.1 GHz ranging from 3.43 to 11.53 GHz and it works for C (4–8 GHz) and X (8–12 GHz) band approximately. The bandwidth of PCR at Full Width Half Maxima (FWHM) achieved is 8.24 GHz (3.60–11.84 GHz). Three distinct PCR peaks are observed at 4.2, 5.98, and 9.46 GHz with PCR magnitudes at 91.07, 96.39, and 99.76% respectively. Analysis of polarization conversion phenomena at these three frequencies is described with the help of current and electric field distribution. The proposed anisotropic structure is examined at different angles under normal and oblique incident. The simulation is performed through ANSYS HFSS (19.1), fabrication is done on substrate FR-4 using printed circuit board (PCB). The simulated and measured curves obtained for reflection coefficient and PCR are similar to one another with minute difference due to fabrication tolerances.

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