The improvement of transmittance in capacitive grid polarizer with dielectric substrates by antireflection coating
This paper presents an approach for the improvement of transmittance in capacitive grid polarizer with dielectric substrates by introducing antireflection(AR) coating. The capacitive grid polarizer using Cu material is printed in the dielectric substrate of PTFE. According to different position relations between grid and substrate, the four structures of the AR coating are verified by the reflection coefficient of TE wave and transmission coefficient of TM wave working at the frequency range from 1GHz to 500GHz. Comparing different AR structures, the periodic strips with back AR have much better performance, where the coefficients of reflection and transmission are more than 0.993 and 0.93 respectively.