Decay of groundplane currents of small antenna elements

Johan Sten, Mervi Hirvonen

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

Expressions are derived for the surface current induced by vertical and horizontal dipoles on a nearby infinite groundplane. The expressions are obtained by means of the exact magnetic field. It is found that for a vertical dipole the surface current density decays roughly as the inverse of the distance from the source, while for a horizontal dipole it decays as the inverse distance squared. The result furnishes an explication for the empirical observation that antennas carrying mainly horizontal currents tend to be less sensitive to the dimensions of a finite groundplane than antennas carrying vertical currents. A formula is given by means of which the groundplane current of a compound source can be evaluated and controlled.
Original languageEnglish
Pages (from-to)82 - 84
Number of pages3
JournalIEEE Antennas and Wireless Propagation Letters
Volume4
Issue number1
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

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Antennas
Induced currents
Current density
Magnetic fields

Keywords

  • antennas
  • ground plane
  • surface current
  • antenna radiation patterns
  • current density
  • dipole antennas
  • magnetic fields
  • compound source
  • groundplane current decay
  • inverse distance square
  • magnetic field
  • small antenna element
  • surface current density
  • vertical-horizontal dipole

Cite this

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title = "Decay of groundplane currents of small antenna elements",
abstract = "Expressions are derived for the surface current induced by vertical and horizontal dipoles on a nearby infinite groundplane. The expressions are obtained by means of the exact magnetic field. It is found that for a vertical dipole the surface current density decays roughly as the inverse of the distance from the source, while for a horizontal dipole it decays as the inverse distance squared. The result furnishes an explication for the empirical observation that antennas carrying mainly horizontal currents tend to be less sensitive to the dimensions of a finite groundplane than antennas carrying vertical currents. A formula is given by means of which the groundplane current of a compound source can be evaluated and controlled.",
keywords = "antennas, ground plane, surface current, antenna radiation patterns, current density, dipole antennas, magnetic fields, compound source, groundplane current decay, inverse distance square, magnetic field, small antenna element, surface current density, vertical-horizontal dipole",
author = "Johan Sten and Mervi Hirvonen",
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Decay of groundplane currents of small antenna elements. / Sten, Johan; Hirvonen, Mervi.

In: IEEE Antennas and Wireless Propagation Letters, Vol. 4, No. 1, 2005, p. 82 - 84.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Decay of groundplane currents of small antenna elements

AU - Sten, Johan

AU - Hirvonen, Mervi

PY - 2005

Y1 - 2005

N2 - Expressions are derived for the surface current induced by vertical and horizontal dipoles on a nearby infinite groundplane. The expressions are obtained by means of the exact magnetic field. It is found that for a vertical dipole the surface current density decays roughly as the inverse of the distance from the source, while for a horizontal dipole it decays as the inverse distance squared. The result furnishes an explication for the empirical observation that antennas carrying mainly horizontal currents tend to be less sensitive to the dimensions of a finite groundplane than antennas carrying vertical currents. A formula is given by means of which the groundplane current of a compound source can be evaluated and controlled.

AB - Expressions are derived for the surface current induced by vertical and horizontal dipoles on a nearby infinite groundplane. The expressions are obtained by means of the exact magnetic field. It is found that for a vertical dipole the surface current density decays roughly as the inverse of the distance from the source, while for a horizontal dipole it decays as the inverse distance squared. The result furnishes an explication for the empirical observation that antennas carrying mainly horizontal currents tend to be less sensitive to the dimensions of a finite groundplane than antennas carrying vertical currents. A formula is given by means of which the groundplane current of a compound source can be evaluated and controlled.

KW - antennas

KW - ground plane

KW - surface current

KW - antenna radiation patterns

KW - current density

KW - dipole antennas

KW - magnetic fields

KW - compound source

KW - groundplane current decay

KW - inverse distance square

KW - magnetic field

KW - small antenna element

KW - surface current density

KW - vertical-horizontal dipole

U2 - 10.1109/LAWP.2005.844649

DO - 10.1109/LAWP.2005.844649

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VL - 4

SP - 82

EP - 84

JO - IEEE Antennas and Wireless Propagation Letters

JF - IEEE Antennas and Wireless Propagation Letters

SN - 1536-1225

IS - 1

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