Bandwidth limitations of impedance matched ideal dipoles

Arto Hujanen, Jan Holmberg, Johan Sten (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    31 Citations (Scopus)

    Abstract

    Using circuit theory and Chu's network representations of the wave impedance of the lowest spherical multipole field, the Ideal dipole, an explicit expression is derived for the upper limit for the impedance bandwidth obtainable for an ideal, lossless, linearly polarized antenna. The expression embodies the network character of an ideal antenna and its role in the guidance of energy between the feed point and the free-space interface, making it more appropriate as a reference than the theoretical radiation quality factor (Q). Moreover, practical antennas do not always manifest a clear single-pole behavior, undermining the basic assumption of a reciprocal relation between Q and the bandwidth.
    Original languageEnglish
    Pages (from-to)3236 - 3239
    Number of pages4
    JournalIEEE Transactions on Antennas and Propagation
    Volume53
    Issue number10
    DOIs
    Publication statusPublished - 2005
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Antennas
    Bandwidth
    Electronic guidance systems
    Circuit theory
    Poles
    Radiation

    Keywords

    • bandwidth
    • impedance matching
    • small antenna
    • spherical multipole
    • antennas
    • Q-factor
    • antenna feeds
    • antenna radiation patterns
    • broadband antennas
    • circuit theory
    • electromagnetic wave polarisation
    • wave impedance
    • linear polarization
    • feed point

    Cite this

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    title = "Bandwidth limitations of impedance matched ideal dipoles",
    abstract = "Using circuit theory and Chu's network representations of the wave impedance of the lowest spherical multipole field, the Ideal dipole, an explicit expression is derived for the upper limit for the impedance bandwidth obtainable for an ideal, lossless, linearly polarized antenna. The expression embodies the network character of an ideal antenna and its role in the guidance of energy between the feed point and the free-space interface, making it more appropriate as a reference than the theoretical radiation quality factor (Q). Moreover, practical antennas do not always manifest a clear single-pole behavior, undermining the basic assumption of a reciprocal relation between Q and the bandwidth.",
    keywords = "bandwidth, impedance matching, small antenna, spherical multipole, antennas, Q-factor, antenna feeds, antenna radiation patterns, broadband antennas, circuit theory, electromagnetic wave polarisation, wave impedance, linear polarization, feed point",
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    year = "2005",
    doi = "10.1109/TAP.2005.856352",
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    pages = "3236 -- 3239",
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    Bandwidth limitations of impedance matched ideal dipoles. / Hujanen, Arto; Holmberg, Jan; Sten, Johan (Corresponding Author).

    In: IEEE Transactions on Antennas and Propagation, Vol. 53, No. 10, 2005, p. 3236 - 3239.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Bandwidth limitations of impedance matched ideal dipoles

    AU - Hujanen, Arto

    AU - Holmberg, Jan

    AU - Sten, Johan

    PY - 2005

    Y1 - 2005

    N2 - Using circuit theory and Chu's network representations of the wave impedance of the lowest spherical multipole field, the Ideal dipole, an explicit expression is derived for the upper limit for the impedance bandwidth obtainable for an ideal, lossless, linearly polarized antenna. The expression embodies the network character of an ideal antenna and its role in the guidance of energy between the feed point and the free-space interface, making it more appropriate as a reference than the theoretical radiation quality factor (Q). Moreover, practical antennas do not always manifest a clear single-pole behavior, undermining the basic assumption of a reciprocal relation between Q and the bandwidth.

    AB - Using circuit theory and Chu's network representations of the wave impedance of the lowest spherical multipole field, the Ideal dipole, an explicit expression is derived for the upper limit for the impedance bandwidth obtainable for an ideal, lossless, linearly polarized antenna. The expression embodies the network character of an ideal antenna and its role in the guidance of energy between the feed point and the free-space interface, making it more appropriate as a reference than the theoretical radiation quality factor (Q). Moreover, practical antennas do not always manifest a clear single-pole behavior, undermining the basic assumption of a reciprocal relation between Q and the bandwidth.

    KW - bandwidth

    KW - impedance matching

    KW - small antenna

    KW - spherical multipole

    KW - antennas

    KW - Q-factor

    KW - antenna feeds

    KW - antenna radiation patterns

    KW - broadband antennas

    KW - circuit theory

    KW - electromagnetic wave polarisation

    KW - wave impedance

    KW - linear polarization

    KW - feed point

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    DO - 10.1109/TAP.2005.856352

    M3 - Article

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    JO - IEEE Transactions on Antennas and Propagation

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