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Electric and magnetic fields from a semi-infinite antenna above a conducting plane
Uppsala University. (EMC)ORCID iD: 0000-0002-1607-2493
University of Florida, Gainesville, USA.
Uppsala University.
2004 (English)In: Journal of Electrostatics, ISSN 0304-3886, E-ISSN 1873-5738, Vol. 61, no 3-4, 209-221 p.Article in journal (Refereed) Published
Abstract [en]

The electric and magnetic field structures around a semi-infinite thin-wire antenna vertically placed above a perfectly conducting ground plane are investigated when the antenna is supporting two different types of sources. It is shown that when the wire is carrying a uniform line charge, the electrostatic potentials are equal on the surfaces of imaginary cones of fixed cone angles with axis along the wire and apex at the conducting plane. The electrostatic field vectors are shown to be perpendicular to the imaginary cones and tangential to the meridian lines of half-spherical shells centered at the base of the line charge. The vertical components of the electrostatic field on the surface of these imaginary half-spherical shells of a given radius are constant, except at the wire itself. The magnetic field structure associated with a constant current in the semi-infinite antenna is that of an infinite wire. The electric and magnetic fields due to a time-varying charge or current pulse propagating with the speed of light along the vertical thin-wire antenna have a spherical transverse electromagnetic (TEM) field structure, identical to that for the case of a uniform line charge and a uniform current. The connection between the static and dynamic solutions is derived mathematically using two different approaches.

Place, publisher, year, edition, pages
2004. Vol. 61, no 3-4, 209-221 p.
Keyword [en]
vertical thin-wire antenna; spherical transverse electromagnetic field; pulse propagation; transmission line model; lightning return stroke
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-62567DOI: 10.1016/j.elstat.2004.02.008ISI: 000222100500005OAI: diva2:480582

QC 20120120

Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2016-03-16Bibliographically approved

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Thottappillil, Rajeev
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