Study on size optimization and bandwith enhancement of microwave antennas using numberical techniques

Abstract

ABSTRACT newlineAntennas are the most significant components for any wireless communication system. The objective of this thesis is to presents a new kind of antenna, designed by the help of genetic algorithm, which serves different properties like compact size, multiband and is enough flexible to be used in several wireless microwave communication technologies. The work described in this thesis depends on the numerical analysis of microwave antennas; therefore some of the important numerical methods have been explained in the thesis. This thesis describe contributions in various area related to the design and analysis of antennas and their scattering parameters. newlineFirst of all, description of the newly designed wired genetic antenna in terms of the new combination of S-parameter equations is presented here. With the help of genetic algorithm, a new antenna has been designed by chromosomal recombination of two different types of antenna. A new set of scattering parameter equations in term of current and voltage has been examined with the help of method of moment and MATLAB software. As analyzed from the simulation results, antenna has been designed to operate for frequency range of 2.4GHz to 3.65GHz. The newly designed wired genetic antenna shows a low return loss and 40 % band width; therefore it s very useful for many wireless multiband applications. newlineSecondly, this thesis describes new antenna structure designed with the concept of wired genetic antenna mounted on the aperture coupled microstrip antenna to enhance the bandwidth and gain of the antenna. The concept of the mounting wired genetic antenna on aperture coupled microstrip antenna helps to increase the gain without adversely affecting its bandwidth. The proposed patch antenna is designed and simulated on IE3D simulation software. By inserting newlinethe wired genetic antenna into the substrate, the resultant antenna structure increases the gain by more than 6 dB and also achieves a bandwidth of 12.3%. newlineFinally, this dissertation focuses on the development of a ne