The electromagnetic characteristics of loop antennas positioned in cylindrically stratified media
W.D. Rawle, PhD
Chair IEEE Maine Section
A loop antenna positioned in a cylindrically stratified media provides a canonical foundation for the analysis of many interesting problems: the design of loop antennas for both communications and geophysical sensing; the design of dielectric rod antennas and fiber optic components; and even the occurrence of color blindness in the human eye. This presentation discusses an analytical formulation of a loop antenna in cylindrically stratified media leading to the solution for the antenna’s current distribution in response to a generally accepted excitation; the determination of input impedance and its dissociation into components attributable to radiation and surface wave excitation; and associated radiation characteristics. The antenna is modeled using a thin wire current distribution positioned as a boundary condition discontinuity at the cylindrically stratified layer interface. A Debye potentials based formulation leads to formal exact expressions for all electromagnetic field components. Input impedance is evaluated using numerical quadrature, residue theory, and a large argument tail approximation to the integral expression. Radiation characteristics are evaluated using a steepest descent technique. The formulation and results have been validated through comparisons to results presented in the literature, mostly notably Smith’s work published in Johnson and Jasik’s Antenna Engineering Handbook. Future work on this topic will focus on evaluating the mutual coupling between antenna elements positioned both in echelon, and in coplanar configuration, in both LIH (linear, isotropic, and homogenous) and non LIH media.
See below for biography
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- Date: 11 Jan 2021
- Time: 06:00 PM to 07:00 PM
- All times are (UTC-05:00) Eastern Time (US & Canada)
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- Syracuse, New York
- United States
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The electromagnetic characteristics of loop antennas positioned in cylindrically stratified media
Biography:
W.D. Rawle, PhD, serves as Chair, IEEE Maine Section, and on three IEEE USA Congressional Policy Committees: Artificial Intelligence and Autonomous Systems, Research and Development, and Transportation and Aerospace. He is a veteran of GE Research and United Technologies. He is currently employed by General Dynamics; is Founder and CTO, Oxford Analytics LLC; and holds academic appointments at the University of Maine and the University of Southern Maine. His personal research interests broadly include theoretical and computational electromagnetics, Bayesian inference and its application to artificial intelligence algorithm formulation, and the derivation of knowledge extraction from multi-domain sensor fusion. Dr. Rawle, a Nova Scotian by heritage, received his PhD from the University of Manitoba. Working with advisor Dr. L Shafai, Dr. Rawle received his MASc and BEngEE degrees from the Technical University of Nova Scotia, Halifax, Canada. He is active in the amateur radio hobby with US callsign AC1AE and Canadian callsign VE1AWS, operating mostly on CW, with homebrew equipment, at the low end of the 80 and 40 meter bands.
Agenda
Login starts 5:45 p.m.
Speaker starts 6:00 p.m.
Questions 7:00 p.m. to 7:30 p.m.