Investigation of electrically small antennas designed for directive radiation from transient signaling
Mitchell, David S
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https://hdl.handle.net/2142/129665
Description
Title
Investigation of electrically small antennas designed for directive radiation from transient signaling
Author(s)
Mitchell, David S
Issue Date
2025-03-04
Director of Research (if dissertation) or Advisor (if thesis)
Bernhard, Jennifer T
Doctoral Committee Chair(s)
Bernhard, Jennifer T
Committee Member(s)
Schutt-Aine, Jose E
Makela, Jonathan J
Kolb, Paul
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Antennas
electrically small antennas
directivity
transient antennas
Language
eng
Abstract
Electrically small antennas are a useful subset of antennas because of their small physical size; however, they are inherently limited in their performance because of the relation between electrical size and bandwidth. Many authors have recently sought to improve the performance of electrically small antennas by introducing nonlinear or time-varying components, using transient signaling, or increasing the directivity of the antenna. This work explores an antenna system that leverages the inherent narrowband nature of an electrically small antenna to achieve directive radiation from the transient ringing of the antenna system. This novel antenna is first explored through simulation. Next, a circuit model for predicting the operating frequency of this antenna is developed. Several versions of this antenna are then manufactured and characterized. Finally, a method for characterizing the transient behavior of an antenna is described and used to demonstrate the directive transient radiation of this antenna. This dissertation demonstrates the design of an antenna shown to have directive radiation with both continuous and transient excitations and methods for characterizing that radiation.
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