uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Electromagnetic fields of a short electric dipole in free space - revisited
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2012 (English)In: PROG ELECTROMAGN RES, ISSN 1559-8985, Vol. 131, 357-373 p.Article in journal (Refereed) Published
Abstract [en]

Maxwell's equations specify that electromagnetic radiation fields are generated by accelerating charges. However, the electromagnetic radiation fields of an accelerating charge are seldom used to derive the electromagnetic fields of radiating systems. In this paper, the equations pertinent to the electromagnetic fields generated by accelerating charges are utilized to evaluate the electromagnetic fields of a current path of length l for the case when a pulse of current propagates with constant velocity. According to these equations, radiation is generated only at the end points of the channel where charges are being accelerated or decelerated. The electromagnetic fields of a short dipole are extracted from these equations when r >> l, where r is the distance to the point of observation. The speed of propagation of the pulse enters into the electromagnetic fields only in the terms that are second order in l and they can be neglected in the dipole approximation. The results illustrate how the radiation fields emanating from the two ends of the dipole give rise to field terms varying as 1/r and 1/r(2), while the time-variant stationary charges at the ends of the dipole contribute to field terms varying as 1/r(2) and 1/r(3).

Place, publisher, year, edition, pages
2012. Vol. 131, 357-373 p.
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
URN: urn:nbn:se:uu:diva-187126DOI: 10.2528/PIER12071601ISI: 000309257100021OAI: oai:DiVA.org:uu-187126DiVA: diva2:573763
Available from: 2012-12-03 Created: 2012-12-03 Last updated: 2013-03-04Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Cooray, Vernon
By organisation
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 146 hits
ReferencesLink to record
Permanent link

Direct link