Design and Fabrication of Microstrip Patch Antenna for EMI Radiations Absorption

Abstract

The present thesis investigate a novel design and analysis of an antenna with medium band and high band frequency application range. The aim of the work is to design and fabricate a coaxial fed microstrip patch antenna having a specific antenna dimensions. Low dielectric constant substrates are generally preferred for maximum radiation. The design of required patch antenna is simulated by using software named IE3D v-12 simulator Zeland Inc. and required patch antenna and its parameters can be realized as per design requirements. The rectangular, elliptical and triangular patch antenna are designed by varying the ground dimensions, patch and substrate dimensions. Our main aim is to design an antenna which is capable to absorb harmful radiations and obtain a suitable material which is used for making a patch or substrate. With the discovery of CNT and Nanomaterial s, it is possible to use various techniques for absorption of EMI radiations. Basically a substrate can be used of FR4 Glass epoxy and has standard values such as dielectric constant of 4.4. Substrate material can further be modified by adding allows of Bismuth ferrites to substrate for EMI absorption material. While selecting substrate material few properties of materials should be considered such as in FR4 (high loss, low antenna gain, easy available and low cost substrate material), RT Duroid 6002 (has low permittivity and low loss, high gain antenna), RO4730 in portable handset and mobile (high performance, less weight, low distortion, loss and low permittivity) and Rogers RO 3200 (is ceramic substrate, low cost and used in GPS patch antennas), in our designs we use FR4 glass epoxy substrate. Also, during designing antenna different types of material can be choose to create substrate or patch, these materials are aluminium, bismuth ferrites, copper, FR4 epoxy, GaAs, glass, gold, mica, silicon and many more.