A Multiband Ultrathin Multifunctional Polarization Rotator Metasurface and its Application in RCS Reduction

A polarization rotating metasurface using reflective topology for simultaneous linear to orthogonal linear (LP-OLP) polarization rotation and linear to circular (LP-CP) polarization rotation over the multiple frequency bands is presented in this paper. The top of the unit-cell structure contains a modified ladder-shaped pattern on the thin dielectric substrate, while a continuous metallic layer is placed at the bottom of the metasurface to eliminate the transmission. The proposed multiband polarization rotator metasurface shows linear to circular polarization rotation over the frequency region of 5. 73-5.96GHz, 6. 65-9.82GHz, 11.23-11.78GHz. Simultaneously, it depicts linear to orthogonal linear (LP-OLP) polarization rotation over the frequency bands of 6. 09-6.44GHz, 10.19-10.96GHz. A wide angular stability is also obtained for several practical applications like remote sensing, microwave imaging, etc. This multiband ultrathin multifunctional polarization rotating metasurface is mainly suitable for C-band (4.0-8.0GHz) and X-band (8.0 -12.0GHz) applications. Moreover, a checkerboard surface is designed using the proposed polarization rotator, which reduces the monostatic and bistatic RCS.