Bandwidth, Q factor, and resonance models of antennas
(2006) In Progress in Electromagnetics ResearchPier 62. p.120 Abstract
 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 BodeFano 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... (More)
 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 BodeFano 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/395462
 author
 Gustafsson, Mats ^{LU} and Nordebo, Sven
 organization
 publishing date
 2006
 type
 Contribution to journal
 publication status
 published
 subject
 in
 Progress in Electromagnetics ResearchPier
 volume
 62
 pages
 1  20
 publisher
 EMW Publishing
 external identifiers

 wos:000239815600001
 scopus:33947245103
 ISSN
 10704698
 DOI
 10.2528/PIER06033003
 language
 English
 LU publication?
 yes
 id
 a2a792aeb1e14723b36200c50a782380 (old id 395462)
 date added to LUP
 20160401 11:48:54
 date last changed
 20211006 02:40:31
@article{a2a792aeb1e14723b36200c50a782380, abstract = {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 BodeFano 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.}, author = {Gustafsson, Mats and Nordebo, Sven}, issn = {10704698}, language = {eng}, pages = {120}, publisher = {EMW Publishing}, series = {Progress in Electromagnetics ResearchPier}, title = {Bandwidth, Q factor, and resonance models of antennas}, url = {http://dx.doi.org/10.2528/PIER06033003}, doi = {10.2528/PIER06033003}, volume = {62}, year = {2006}, }