A broadband transmission polarization rotator using multi layer split rings

Abstract

In this paper a broadband transmission polarization rotator based on multi layered metasurfaces has been presented. The proposed structure consists of three differently oriented split rings separated by FR4 dielectric substrates and air spacers between them. The simulation results show that the designed structure can rotate linearly polarized incident electromagnetic wave by 90° in the frequency band of 9 – 13.2 GHz. Cross-polarized transmission coefficient is observed to be more than 0.8 whereas co-polarized transmission is less than 0.4 for the frequency range. Polarization rotation mechanism has been further explained by analysing individual layers and plotting surface current distribution of the proposed structure. A prototype has also been fabricated and reasonable agreement between simulated and experimental results is observed.