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Stored energies for electric and magnetic currents with applications to Q for small antennas
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0001-7269-5241
2013 (English)In: 2013 International Symposium on Electromagnetic Theory, EMTS 2013 - Proceedings, IEEE , 2013, 1050-1053 p.Conference paper, Published paper (Refereed)
Abstract [en]

Fundamental limitations restrict the bandwidth of electrically small antennas. A method to obtain such limitations is based on stored electric and magnetic energies. Vandenbosch recently proposed a set of integral expression for the stored energies. These expressions provide a method to determine optimal currents and physical bounds on antennas for maximal bandwidth and desired radiated fields. In the present paper, we generalize the expressions for the stored energies to include magnetic sources for small structures. We give an expression for the antenna Q for electrically small shapes. Examples for small spheres are tested and the results agree with the published results.

Place, publisher, year, edition, pages
IEEE , 2013. 1050-1053 p.
Series
URSI International Symposium on Electromagnetic Theory, ISSN 2163-405X
Keyword [en]
Electrically small antennas, Fundamental limitations, Magnetic currents, Magnetic energies, Magnetic sources, Optimal current, Radiated Field, Small spheres, Bandwidth, Electric fields, Antennas
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-133789ISI: 000327180500269Scopus ID: 2-s2.0-84883236310ISBN: 978-1-4673-4939-0 (print)OAI: oai:DiVA.org:kth-133789DiVA: diva2:677307
Conference
2013 21st International Symposium on Electromagnetic Theory, EMTS 2013; Hiroshima; Japan; 20 May 2013 through 24 May 2013
Note

QC 20131209

Available from: 2013-12-09 Created: 2013-11-11 Last updated: 2013-12-20Bibliographically approved

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Jonsson, B. Lars G.

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