Design and Analysis of Ultrathin Polarization Rotating Frequency Selective Surface Using V-Shaped Slots

A novel polarization rotator design is demonstrated theoretically as well as experimentally based on frequency-selective surface (FSS). The polarization rotator selectively allows the linearly polarized incident wave to pass through the structure and rotates it by 90° in a given frequency band. The periodic element of the FSS design consists of orthogonally oriented V-shaped slots on two metal sheets with the dielectric substrate separating the sheets. The proposed structure exhibits a relative bandwidth of 8% (9.76-10.57 GHz) with a maximum insertion loss of 0.5 dB. Copolarized reflection coefficient is less than -10 dB in the same frequency band. The novelties of the structure lie in its reduced thickness (0.053λo) as well as compact design (0.28λo) as compared to the existing polarization rotators. A prototype has also been fabricated, and good agreement between the simulated and experimental results is observed.