Multifunctional Polarization Converter Metasurface for Microwave Applications

Abstract

One of the most distinguishing characteristics of electromagnetic waves is polarization, which plays important part in many microwave and optical applications. There is a demanding need to develop an innovative technique to control and manipulate polarization of EM waves. In this thesis, a multifunctional metasurface polarization converter is designed and developed to achieve the linear to linear and linear to circular polarization conversion along with absorption functionality. The proposed metasurface consists of circular rings resonator structure printed on top layer with complete copper at the bottom layer. The LP-LP, PCR is greater than 90 % in two frequency bands with fractional bandwidth of 20 % and for LP-CP, the AR is less than 3 dB in two bands frequency bands with max fractional bandwidth of 75.48 %. The proposed metasurface is also capable to achieve the absorption in two bands, where the absorption is 84 % and 94% from 14.46 – 14.95 GHz and 16.28 – 16.56 GHz. The light weight, compact size, plus the multi functionality feature (Polarization conversion and absorptivity) making this metasurface a good choice to be utilized in different microwave applications like radar, wireless communication applications, satellite communication, RCS reduction application and also in modern telecommunication devices.