DESIGN & ANALYSIS OF DUAL FREQUENCY ANGULAR RING MICROSTRIP ANTENNA WITH PERTURBATION METHOD USING MAPLESOFT

Abstract

Angular Ring Microstrip Antenna (ARMA) with perturbation at its centre is designed and is studied for its frequency characteristics .A microstrip antenna in its simplest configuration consists of radiating patch on one side of a dielectric substrate (εr ) ,which has a ground plane on the other side. However they suffer from a drawback that surface waves are formed .These waves reduce antenna efficiency and gain, limit bandwidth, increase end-fire radiation, and limit the applicable frequency antenna. In 1977 , L. Lewin initiated the concept of analyzing microstrip curve structure with the help of perturbation method .These structure were extensively used in the optical range .However the increasing research and application in the Microwave range led to the frequency of operation to shift into the GHz range. These structures operating in the microwave region are called curve waveguide model. By using second order perturbation radiating power improve up to -60 dB. The project deals with design and analysis of Angular Microstrip Antenna (ARMA) for making perturbed structure, a curved microstrip bend at any general angle α. Compute perturbation of chamfered α region with respect to α region. Use of second order perturbation & fourth iteration the frequency response of antenna improve. Mathematical software MAPLESOFT was used to solving such equation and MATLAB used for comparing the result. Further a study of the effect of different R/w and angle α on the performance of the antenna is presented and discussed in this thesis.