Frequency Selective Surface to Enhance the Performance of High Frequency Antenna

Abstract

In this project, we have simulated the dielectric rod antenna by using CST microwave studio which is commercially available simulator based on finite integral technique and we studied different types of FSS in CST. We emphasize particularly, on the gain of the proposed antenna at two frequencies that is from 25GHz to 35 GHz. The radiation mechanism of the dielectric rod antenna is based on the discontinuity radiation concept in which the antenna is regarded as an array composed of two effective sources at the feed end and free end of the rod. The dielectric rod antenna has a dielectrically filled circular waveguide section that serves as a feed for the dielectric rod. This is followed by a feed taper section that is mainly used for matching the feed to the dielectric rod. The main body of the antenna follows the feed taper and ends in a terminal taper. A frequency selective surface is a periodic array of either radiating or non-radiating elements or slots which effectively act as a bandstop or bandpass filter respectively to electromagnetic waves. The frequency selective surfaces (FSS) are periodic structures in either one or two dimensions (i.e. singly or doubly periodic structures) which perform a filter operation. Thus, depending on their physical construction, material and geometry, they are divided into low-pass, high-pass, band-pass and band-stop filters. FSS can be cascaded to form a triply-periodic structure which is commonly known as a photonic crystal. There are a wide