Design of Frequency Selective Surface Loaded to Multilayer Dielectric Plate for Loss Reduction over Wide Incident Angle

Thickness of windshield, radomes, plastic cases of wireless systems are comparable with a wavelength in the millimeter-wave band. In this case, the total reflection from the boundary surfaces of the dielectric plate increases depending on frequency and input angle of incident wave. To solve the problem increasing reflection, Frequency Selective Surface (FSS) is loaded to the dielectric plate. Transmission efficiency is significantly improved by canceling the reflections. We propose the design technique to find the required characteristics of FSS from the desired characteristic of whole multilayer dielectric plate with FSS. Reflection loss of the windshield was declined in the range of incident angle from 30 to 60 degrees at 76.5GHz.