Bandwidth limitations of impedance matched ideal dipoles

Arto Hujanen; Jan Holmberg; Johan Sten

doi:10.1109/TAP.2005.856352

Bandwidth limitations of impedance matched ideal dipoles

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

Research output: Contribution to journal › Article › Scientific › peer-review

32 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 language	English
Pages (from-to)	3236 - 3239
Number of pages	4
Journal	IEEE Transactions on Antennas and Propagation
Volume	53
Issue number	10
DOIs	https://doi.org/10.1109/TAP.2005.856352
Publication status	Published - 2005
MoE publication type	A1 Journal article-refereed

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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10.1109/TAP.2005.856352

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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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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

U2 - 10.1109/TAP.2005.856352

DO - 10.1109/TAP.2005.856352

M3 - Article

SN - 0018-926X

VL - 53

SP - 3236

EP - 3239

JO - IEEE Transactions on Antennas and Propagation

JF - IEEE Transactions on Antennas and Propagation

IS - 10

ER -

Bandwidth limitations of impedance matched ideal dipoles

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