Frequency Selective Surface Of Microstrip Antenna

Abstract

The research on Frequency Selective Surfaces (FSS) of Micro strip Antenna is based on newlineband-pass and band stop characteristics. The three-dimensional Frequency Selective Surfaces newline(3D FSS) of band-pass characteristics are designed with pseudo-elliptic response of multiple newlinetransmission zeros and poles. For the band-pass characteristics, two 3D FSS Structures are newlineconstructed, with a single band-pass region and the multiple (two) band-pass regions. The one newlinethree-dimensional Frequency Selective Surface (3D FSS) with band reject multiple transmission newlinezeros and pseudo-elliptic response is designed from two-dimensional (2D) periodic array of newlineshielded micro strip lines to realize wide out of band radio wave rejection. The 3D FSS array newlineconsists of multimode cavities whose coupling with air can be controlled to obtain a desired newlinefrequency range. The proposed FSS with shorting via to ground exhibits pseudo-elliptic bandreject newlineresponse in the frequency range from 6GHz to 14GHz. Another elliptic band pass response newlinethree-dimensional Frequency Selective Surface (3D FSS) structure is designed from a single unit newlinecell of 2D array of two shielded microstrip lines. The designed FSS provides pseudo-elliptic newlineband-pass frequency response (5.4 9.6) GHz. The four transmission zeros at 5.4GHz, 9.6GHz, newline12.4GHz and 15GHz provides wide out-of-band frequency rejection. The 3D FSS is independent newlineof the variations in the incident angle of the plane wave up to 60 degree. Each unit cell is a newlinecombination of two shielded microstrip lines with one having an air gap and the other one having newlinein between rectangular metallic plate. When a TE polarized plane wave incident perpendicular newlineto the perfect electric conductor (PEC) boundary walls shielded microstrip lines, it results in two newlinequasi-TEM modes namely air and substrate mode. The 3D FSS consists of multiple resonators newlinewith a multimode cavity having number of propagating modes. These resonating modes in phase newlineprovide transmission poles and when out of phase give transmission zeros. The substrate mater