[CCoE Notice] Masters Thesis Defense

[Khator, Suresh]

MS Thesis Announcement

Analysis of Linear Series-Fed Rectangular Microstrip Antenna Array

Sohini Sengupta
10/14/2011, Friday, 3.00 pm, ECE Conference Room

Committee Chair: Dr David Jackson         Committee Members:     Dr Stuart Long, Dr Lowell Wood

The purpose of this work is to formulate an efficient and relatively simple method for analyzing a linear series-fed microstrip antenna array, in order to find the amplitude distribution, radiation characteristics and input impedance of the array at or around the resonance frequency. Usually an array is preferred for requirements on radiation characteristics such as high gain, limitations on the side-lobe level, beam pointing, scanning or steering. So the radiation characteristics of an array are often the primary focus of its design. Knowing the amplitude distribution is the key to determining the radiation pattern of the array. A linear series-fed microstrip antenna array is a series of microstrip antenna elements with a linear arrangement with the adjacent elements inter-connected by microstrip lines. Here we consider the case of a series-fed microstrip antenna array which is fed at one end and terminated by a load at the other end. The elements in the array are not necessarily of the same size, but their resonant lengths should be the same so that all the elements resonate at the same frequency. With the microstrip lines modeled as transmission lines, based on the knowledge of the field distribution in microstrip elements around resonance, a method can be devised to calculate the normalized amplitude distribution on the array. The knowledge of the radiation pattern of the microstrip antenna elements and the normalized amplitude distribution would allow an estimate of the radiation pattern of the linear series-fed microstrip antenna array. The analysis also yields the currents and voltages at the feed points of the elements in the array, from which the input impedance of the array can be obtained. The amplitude distribution, far-field radiation pattern and input impedance of such an array as predicted by the analysis is validated by the results of simulations on two different full-wave simulation softwares - Ansys Designer and Ansys HFSS. Also, a comparison is done with the results of analysis using transmission line model.



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