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Bandwidth, Q factor, and resonance models of antennas
Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.ORCID iD: 0000-0002-7018-6248
2006 (English)In: Progress in Electromagnetics Research PIER, Vol. 62, p. 1-20Article in journal (Refereed) Published
Abstract [en]

In this paper, we introduce a first order accurate resonance model based on a second order Pade approximation of the reflection coefficient of a narrowband antenna. The resonance model is characterized by its Q factor, given by the frequency derivative of the reflection coefficient. The Bode-Fano matching theory is used to determine the bandwidth of the resonance model and it is shown that it also determines the bandwidth of the antenna for sufficiently narrow bandwidths. The bandwidth is expressed in the Q factor of the resonance model and the threshold limit on the reflection coefficient. Spherical vector modes are used to illustrate the results. Finally, we demonstrate the fundamental difficulty of finding a simple relation between the Q of the resonance model, and the classical Q defined as the quotient between the stored and radiated energies, even though there is usually a close resemblance between these entities for many real antennas.

Place, publisher, year, edition, pages
2006. Vol. 62, p. 1-20
Keywords [en]
antennas theory, spherical modes, broad band matching
National Category
Other Physics Topics Signal Processing
Research subject
Physics, Electrotechnology
Identifiers
URN: urn:nbn:se:vxu:diva-3178OAI: oai:DiVA.org:vxu-3178DiVA, id: diva2:203134
Available from: 2006-08-21 Created: 2006-08-21 Last updated: 2017-01-10Bibliographically approved

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Nordebo, Sven

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