University of Adelaide Library

Adelaide Research and Scholarship : Schools and Disciplines : School of Electrical and Electronic Engineering : Electrical and Electronic Engineering Publications

Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/73397

Type: Journal article
Title: Miniaturised high-frequency and very-high-frequency antennas based on optimised non-uniform helical structures
Author: Zhao, Shifu
Fumeaux, Christophe
Coleman, Christopher John
Citation: IET Microwaves, Antennas & Propagation, 2012; 6(6):603-610
Publisher: The Institution of Engineering and Technology
Issue Date: 2012
ISSN: 1751-8725
School/Discipline: School of Electrical and Electronic Engineering
Statement of
Responsibility: 
S. Zhao, C. Fumeaux, C. Coleman
Abstract: Helical windings are often used to shorten the length of a resonant low-frequency antenna, but this results in an antenna with narrow bandwidth for the normal mode. The windings are usually uniform, but in contrast the current study investigates the possible advantage of optimised non-uniform windings for improved bandwidth. Optimisation can involve a prohibitive number of variables when continuous variations along the antenna are described in terms of wire segment geometry. This study, however, reduces such requirements by describing the winding variations (pitch and radius) in terms of a limited number of parameters. These parameters are the coefficients of expansion of the variations in terms of radial basis functions. By this artifice, the optimisation problem is made tractable with limited computer resource. An evolutionary optimiser is used to achieve the optimal winding shape with respect to radius and pitch. Measured results from prototypes demonstrate the optimisation process to be effective. Further, simulations using non-ideal ground planes show the designs to be robust.
Rights: © The Institution of Engineering and Technology 2012
RMID: 0020120244
DOI: 10.1049/iet-map.2012.0023
Appears in Collections:Electrical and Electronic Engineering Publications
View citing articles in: Web of Science
Google Scholar
Scopus

There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

© 2008 The University of Adelaide
library@adelaide.edu.au
CRICOS Provider Number 00123M
Service Charter | Copyright | Privacy | Disclaimer