Decay of groundplane currents of small antenna elements

Johan Sten, Mervi Hirvonen

    Research output: Contribution to journalArticleScientificpeer-review

    12 Citations (Scopus)


    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
    Issue number1
    Publication statusPublished - 2005
    MoE publication typeA1 Journal article-refereed


    • 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


    Dive into the research topics of 'Decay of groundplane currents of small antenna elements'. Together they form a unique fingerprint.

    Cite this