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

    Fingerprint

    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",
    year = "2005",
    doi = "10.1109/LAWP.2005.844649",
    language = "English",
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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

    M3 - Article

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    SP - 82

    EP - 84

    JO - IEEE Antennas and Wireless Propagation Letters

    JF - IEEE Antennas and Wireless Propagation Letters

    SN - 1536-1225

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    ER -