A Novel Reflective Surface With Polarization Rotation Characteristic

A reflective surface with polarization rotation property is proposed in this letter. The primary function of the surface is to reflect the linearly polarized incident wave with 90° polarization rotation. The fractional bandwidth reaches up to 9.5%, with copolarization reflection coefficient better than -10 dB at normal incidence. Stable frequency responses in the passband have been obtained with oblique incidence for TE polarization. The periodic element of the proposed surface consists of a dual-mode substrate integrated waveguide (SIW) cavity resonator with horizontal and vertical slots on the same side. A parametric study of its frequency responses has been done with full-wave simulation. To verify the design method, a prototype designed at 35 GHz is fabricated and measured. The measured results are in good agreement with the numerical simulations.