Stored electromagnetic energy and antenna Q

Autor:	Gustafsson, Mats, Jonsson, B. Lars G.
Jazyk:	angličtina
Rok vydání:	2015
Předmět:	Energy density Electromagnetic waves Far field Other Physics Topics Stored energy Annan fysik Energy expression Fundamental limitations
ISSN:	2013-0422
Popis:	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. QC 20130422. Updated from manuscript to article in journal.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::cabdae0fb45165b551b412cf932140f4 http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-117929 Zobrazit plný text záznamu