Design and Development of Polarization Agile Frequency Selective Surfaces (FSS) for C, X and Ku bands

Abstract

In this thesis, to realize the concept of Co-Cross(LP-LP) and Cross-Circular(LP-CP) polarization of the reflected wave, a multi-band polarization agile frequency selective surface (FSS) for C, X and Ku bands is presented. It consists of a periodic single-layered split circular ring with rectangular slot and small split inscribed circle shaped metasurface is designed by introducing the split circular structure. It consists of diagonal strip that surrounds the half solid circular strips that behaves like a capacitor. The bottom layer consists of full copper ground structure that makes it as a perfect reflector. The proposed metasurface is able to adds the Co-Cross(LP-LP) and Cross-Circular(LP-CP) capability. There are three LP-LP Polarization bands are achieved from 7.3-7.7 GHz, 9.0-9.3 GHz and 15.3-17 GHz. Similarly, for LP-CP, a mature band of 9.8-13 GHz having a fractional bandwidth of 28% is achieved. Furthermore, multiple useful operating bands and miniaturized single layer profile makes the proposed structure of metasurface a good candidate for polarization conversion useful applications.