A Compact Metasurface Based Cross Polarization Converter for X Band Applications

This article reports on a compact, single layer polarizer having angular independent metasurface. The proposed design can efficiently convert cross polarization to co-polarization and vice versa for X - band applications. The unit cell consists of a stretched 8 shaped element printed diagonally on an FR4 substrate having 1.6 mm thickness backed by ground plane. The proposed design converts a linearly polarized incident wave into its orthogonal counterpart after getting reflected from the metasurface polarizer provided that the incident wave is polarized in x or y axis. Two distinct polarization conversion peaks are obtained at 9.9 GHz and 11.2 GHz with overall bandwidth more than 2 GHz. The design also exhibits stable frequency response at oblique angles of incidence up-to 45°. A finite prototype with overall dimensions of 210 × 290 mm ² containing 21 × 15 unit cells is fabricated and tested. A good agreement between the measured and simulated results showed that the proposed design can be employed for linear polarization conversion applications in X band.