Design of Shared Aperture Microstrip Patch Antennas and Array for L S Band

Abstract

In this thesis, research has been carried out to the study of shared aperture based antenna design for L and S-band. Cavity model , being the simplest model that also leads to reactive input impedance, is used for the exploration of Microstrip Patch Antenna (MPA) to calculate the resonating frequency, input impedance and other important parameters of various configurations based on aperture sharing of two adjacent bands i.e. L and S bands. First of all, a simple structure using Dollar shape is developed to check the feasibility of the two adjacent bands i.e L and S bands on the same aperture. Then, effect of coupling is analysed on two Dollar shaped patched antennas placed by each other on the same aperture. This work is presented as a preliminary work in the introduction chapter. To further study, two different configurations of patch antennas are developed based on standard Y-shape. Again the structure is designed using the same surface and placed by each other. After studying the effect of placement of two different configurations i.e. dollar shaped and Y shaped patch antenna, a study is undertaken to investigate the influence of parasitic elements on Swastika shaped and parasitic antenna based structures using different configurations while using aperture sharing for L/S-band. Next, the aperture sharing method is executed and the influence of notch formation on the resonating frequencies of the patch antenna is deliberated. Finally, analysis of the MPA array based on aperture sharing, again for L/S bands, is presented along with the effect of array formation on the overall antenna parameters such as dimensions, resonating frequency and other properties wherein an attempt has been made to reduce the isolation between two patched antennas while improving the overall bandwidth of the structure. newline