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Application of gain-bandwidth bounds on loaded dipoles

Derneryd, Anders LU ; Gustafsson, Mats LU ; Kristensson, Gerhard LU and Sohl, Christian LU (2009) In IET Microwaves, Antennas & Propagation 3(6). p.959-966
Abstract
Physical limitations based only on antenna volume, form factor and material parameters are applied to electrically small antennas in the form of single dipoles. The upper bound on the gain-bandwidth product is solely determined by the polarisability matrix that characterises the antenna when it is immersed in a uniform applied static field. The polarisability, and hence the bandwidth, is increased by loading the dipole arms close to their ends. The half-power impedance bandwidth is increased from 5 to 13% by moving the coils from the centre to the ends of the dipole arms. The introduction of a stub-matching further improves the bandwidth but the physical limit is not reached. Finally, a dual-resonance dipole antenna is analysed. It is... (More)
Physical limitations based only on antenna volume, form factor and material parameters are applied to electrically small antennas in the form of single dipoles. The upper bound on the gain-bandwidth product is solely determined by the polarisability matrix that characterises the antenna when it is immersed in a uniform applied static field. The polarisability, and hence the bandwidth, is increased by loading the dipole arms close to their ends. The half-power impedance bandwidth is increased from 5 to 13% by moving the coils from the centre to the ends of the dipole arms. The introduction of a stub-matching further improves the bandwidth but the physical limit is not reached. Finally, a dual-resonance dipole antenna is analysed. It is observed that a second resonance hardly reduces the bandwidth of the first resonance if the resonances are separated more than 1.7 times in frequency. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
IET Microwaves, Antennas & Propagation
volume
3
issue
6
pages
959 - 966
publisher
Institution of Engineering and Technology
external identifiers
  • wos:000269621000008
  • scopus:68949101523
ISSN
1751-8725
DOI
10.1049/iet-map.2008.0251
language
English
LU publication?
yes
id
8d6fe33f-b0bb-4a19-b2fd-59c243cdf312 (old id 1174671)
date added to LUP
2008-07-24 14:13:36
date last changed
2017-11-12 04:06:19
@article{8d6fe33f-b0bb-4a19-b2fd-59c243cdf312,
  abstract     = {Physical limitations based only on antenna volume, form factor and material parameters are applied to electrically small antennas in the form of single dipoles. The upper bound on the gain-bandwidth product is solely determined by the polarisability matrix that characterises the antenna when it is immersed in a uniform applied static field. The polarisability, and hence the bandwidth, is increased by loading the dipole arms close to their ends. The half-power impedance bandwidth is increased from 5 to 13% by moving the coils from the centre to the ends of the dipole arms. The introduction of a stub-matching further improves the bandwidth but the physical limit is not reached. Finally, a dual-resonance dipole antenna is analysed. It is observed that a second resonance hardly reduces the bandwidth of the first resonance if the resonances are separated more than 1.7 times in frequency.},
  author       = {Derneryd, Anders and Gustafsson, Mats and Kristensson, Gerhard and Sohl, Christian},
  issn         = {1751-8725},
  language     = {eng},
  number       = {6},
  pages        = {959--966},
  publisher    = {Institution of Engineering and Technology},
  series       = {IET Microwaves, Antennas & Propagation},
  title        = {Application of gain-bandwidth bounds on loaded dipoles},
  url          = {http://dx.doi.org/10.1049/iet-map.2008.0251},
  volume       = {3},
  year         = {2009},
}