Analysis of a finite array threshold through surface waves
Grady, Ian Daniel Walsdorf
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https://hdl.handle.net/2142/105085
Description
Title
Analysis of a finite array threshold through surface waves
Author(s)
Grady, Ian Daniel Walsdorf
Issue Date
2019-04-24
Director of Research (if dissertation) or Advisor (if thesis)
Bernhard, Jennifer T.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(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."
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