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Energy Stored by Radiating Systems

Schab, Kurt ; Jelinek, Lukas ; Capek, Miloslav ; Ehrenborg, Casimir LU orcid ; Tayli, Doruk LU ; Vandenbosch, Guy A. E. and Gustafsson, Mats LU orcid (2017) In Technical Report LUTEDX/(TEAT-7251)/1-32/(2017)
Abstract
Though commonly used to calculate Q-factor and fractional bandwidth, the energy stored by radiating systems (antennas) is a subtle and challenging concept that has perplexed researchers for over half a century. Here, the obstacles in defining and calculating stored energy in general electromagnetic systems are presented from first principles as well as using demonstrative examples from electrostatics, circuits, and radiating systems. Along the way, the concept of unobservable energy is introduced to formalize such challenges. Existing methods of defining stored energy in radiating systems are then reviewed in a framework based on technical commonalities rather than chronological order. Equivalences between some methods under common... (More)
Though commonly used to calculate Q-factor and fractional bandwidth, the energy stored by radiating systems (antennas) is a subtle and challenging concept that has perplexed researchers for over half a century. Here, the obstacles in defining and calculating stored energy in general electromagnetic systems are presented from first principles as well as using demonstrative examples from electrostatics, circuits, and radiating systems. Along the way, the concept of unobservable energy is introduced to formalize such challenges. Existing methods of defining stored energy in radiating systems are then reviewed in a framework based on technical commonalities rather than chronological order. Equivalences between some methods under common assumptions are highlighted, along with the strengths, weaknesses, and unique applications of certain techniques. Numerical examples are provided to compare the relative margin between methods on several radiating structures. (Less)
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author
; ; ; ; ; and
organization
publishing date
type
Book/Report
publication status
published
subject
in
Technical Report LUTEDX/(TEAT-7251)/1-32/(2017)
pages
32 pages
publisher
Electromagnetic Theory Department of Electrical and Information Technology Lund University Sweden
report number
7251
project
EIT_CACO-EMD Complex analysis and convex optimization for EM design
language
English
LU publication?
yes
id
fc44f0b6-5af2-4392-9dab-9bd58d50441d
date added to LUP
2017-05-18 13:52:23
date last changed
2018-11-21 21:32:07
@techreport{fc44f0b6-5af2-4392-9dab-9bd58d50441d,
  abstract     = {{Though commonly used to calculate Q-factor and fractional bandwidth, the energy stored by radiating systems (antennas) is a subtle and challenging concept that has perplexed researchers for over half a century. Here, the obstacles in defining and calculating stored energy in general electromagnetic systems are presented from first principles as well as using demonstrative examples from electrostatics, circuits, and radiating systems.  Along the way, the concept of unobservable energy is introduced to formalize such challenges.  Existing methods of defining stored energy in radiating systems are then reviewed in a framework based on technical commonalities rather than chronological order. Equivalences between some methods under common assumptions are highlighted, along with the strengths, weaknesses, and unique applications of certain techniques.  Numerical examples are provided to compare the relative margin between methods on several radiating structures.}},
  author       = {{Schab, Kurt and Jelinek, Lukas and Capek, Miloslav and Ehrenborg, Casimir and Tayli, Doruk and Vandenbosch, Guy A. E. and Gustafsson, Mats}},
  institution  = {{Electromagnetic Theory Department of Electrical and Information Technology Lund University Sweden}},
  language     = {{eng}},
  number       = {{7251}},
  series       = {{Technical Report LUTEDX/(TEAT-7251)/1-32/(2017)}},
  title        = {{Energy Stored by Radiating Systems}},
  url          = {{https://lup.lub.lu.se/search/files/25658290/TEAT_7251.pdf}},
  year         = {{2017}},
}