Bandwidth limitations of impedance matched ideal dipoles

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

Research output: Contribution to journalArticleScientificpeer-review

30 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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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.",
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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

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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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JO - IEEE Transactions on Antennas and Propagation

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SN - 0018-926X

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