Design of circular patch antennas on ferrite substrates

Tsang, K.K. and Langley, R.J. (1998) Design of circular patch antennas on ferrite substrates. IEE Proceedings - Microwaves Antennas and Propagation, 145 (1). pp. 49-55. ISSN 1350-2417. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1049/ip-map:19981449

Abstract

The design and performance of circular microstrip patch antennas on biased ferrites are described, Fundamental and higher-order modes are discussed and measurements presented for two different ferrites. The high permittivity of the substrate reduces the dimensions of the patches, The cavity model is extended to include multilayer ferrite-dielectric substrates with electromagnetic feedline coupling to the patch. This provides an accurate and fast CAD tool for predicting the resonant frequency over a wide bias range, Applying a DC magnetic bias field normal to the ferrite allows tuning of the resonant frequency by about 15%. Two hands of circular polarisation are generated when the magnetic bias is applied, The resulting radiation performance of the patches, in terms of the gain and quality of circular polarisation, is presented. It is shown that the gain is not dependent on the applied bias field and that good axial ratios are measured over a wide range of bias fields, both above and below saturation magnetisation.

Item Type: Article
Uncontrolled keywords: circular patch antennas; ferrite substrates; magnetisation
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics (see also: telecommunications) > TK7871.6 Antennas and waveguides
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics (see also: telecommunications)
Divisions: Faculties > Science Technology and Medical Studies > School of Engineering and Digital Arts
Depositing User: Tara Puri
Date Deposited: 03 Jun 2009 22:12
Last Modified: 03 Jun 2009 22:12
Resource URI: http://kar.kent.ac.uk/id/eprint/17205 (The current URI for this page, for reference purposes)
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