Tunable phase shifter employing variable odd-mode impedance of short-section parallel-coupled microstrip lines

Abbosh, A. M. (2012) Tunable phase shifter employing variable odd-mode impedance of short-section parallel-coupled microstrip lines. IET Microwaves, Antennas and Propagation, 6 3: 305-311. doi:10.1049/iet-map.2011.0386


Author Abbosh, A. M.
Title Tunable phase shifter employing variable odd-mode impedance of short-section parallel-coupled microstrip lines
Journal name IET Microwaves, Antennas and Propagation   Check publisher's open access policy
ISSN 1751-8733
1751-8725
Publication date 2012-02-21
Sub-type Article (original research)
DOI 10.1049/iet-map.2011.0386
Volume 6
Issue 3
Start page 305
End page 311
Total pages 7
Place of publication Stevenage, Herts, United Kingdom
Publisher The Institution of Engineering and Technology
Collection year 2013
Language eng
Abstract A complete design method for a tunable phase shifter that employs a short section of parallel-coupled microstrip lines is presented. In the proposed method, the variation in the phase is achieved by changing the odd-mode impedance of parallel-coupled microstrip lines using a varactor diode that is connected between them. A derived theoretical model shows that a unit-cell phase shifter of around one-tenth of the guided wavelength can be utilised to achieve a continuously tunable phase range in excess of 90° depending on the required bandwidth and acceptable insertion loss. The proposed method shows that in order to achieve the required tunable phase range across a wideband, high even-mode impedance is needed. A slotted ground structure is utilised underneath the coupled structure to realise that target. The proposed method is validated by building a phase shifter that has a very small length of around one-twentieth of the guided wavelength with 45° tunable phase range and about 1°dB insertion loss across the band from 2 to 2.5°GHz.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
School of Information Technology and Electrical Engineering Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
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Created: Fri, 13 Apr 2012, 11:35:00 EST by Dr Amin Abbosh on behalf of School of Information Technol and Elec Engineering