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Stored electromagnetic energy and antenna Q
Electrical and information technology, Lund University.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0001-7269-5241
2015 (English)In: Progress In Electromagnetics Research, ISSN 1070-4698, E-ISSN 1559-8985, Vol. 150, 13-27 p.Article in journal (Refereed) Published
Abstract [en]

Decomposition of the electromagnetic energy into its stored and radiated parts is instrumental in the evaluation of antenna Q and the corresponding fundamental limitations on antennas. This decomposition is not unique and there are several proposals in the literature. Here, it is shown that stored energy defined from the difference between the energy density and the far field energy equals the energy expressions proposed by Vandenbosch for many but not all cases. This also explains the observed cases with negative stored energy and suggests a possible remedy to them. The results are compared with the classical explicit expressions for spherical regions where the results only differ by the electrical size ka that is interpreted as the far-field energy in the interior of the sphere.

Place, publisher, year, edition, pages
2015. Vol. 150, 13-27 p.
Keyword [en]
Electromagnetic waves, Energy density, Energy expression, Far field, Fundamental limitations, Stored energy
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-117929DOI: 10.2528/PIER14111502ISI: 000353121100002Scopus ID: 2-s2.0-84919639100OAI: oai:DiVA.org:kth-117929DiVA: diva2:603921
Funder
Swedish Research CouncilThe Crafoord FoundationVINNOVASwedish Foundation for Strategic Research
Note

QC 20130422. Updated from manuscript to article in journal.

Available from: 2013-04-22 Created: 2013-02-07 Last updated: 2017-12-06Bibliographically approved

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Jonsson, B. Lars G.

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