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Title:Analysis of a finite array threshold through surface waves
Author(s):Grady, Ian Daniel Walsdorf
Advisor(s):Bernhard, Jennifer T.
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):finite array
finite array threshold
surface waves
active input impedance
edge effects
dummy elements
Abstract:Antenna arrays are an active area of electromagnetics research, due to their applications in sensing and communication. As the size of electronic devices is decreased, the total space in which an antenna array can be implemented also decreases. As antenna arrays get smaller, infinite array approximations that can be used when an array is large can no longer be used due to inaccuracies, termed "edge effects," caused by the edge of the array. Accordingly a so-called finite array threshold, at which point edge effects can no longer be neglected, is proposed in this thesis for an array of planar half-wave dipoles. Initial studies examine the input impedance of the antenna elements across frequency. The radiation pattern of a calculated array is compared with the simulated pattern to gain insights into inter-element coupling, and an examination of the effect of array dummy elements is also carried out. Surface waves present in the array and measured with active input impedance are proposed as a unique way to realize the finite array threshold. Finally, an antenna is constructed to show the measurable effects of the surface wave in the radiation pattern of the antenna array.
Issue Date:2019-04-24
Rights Information:Copyright 2019 Ian Daniel Walsdorf Grady
Date Available in IDEALS:2019-08-23
Date Deposited:2019-05

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