Compact tunable reflection phase shifters using short section of coupled lines

Abbosh, Amin M. (2012) Compact tunable reflection phase shifters using short section of coupled lines. IEEE Transactions on Microwave Theory and Techniques, 60 8: 2465-2472. doi:10.1109/TMTT.2012.2198232

Author Abbosh, Amin M.
Title Compact tunable reflection phase shifters using short section of coupled lines
Journal name IEEE Transactions on Microwave Theory and Techniques   Check publisher's open access policy
ISSN 0018-9480
Publication date 2012-08
Sub-type Article (original research)
DOI 10.1109/TMTT.2012.2198232
Open Access Status
Volume 60
Issue 8
Start page 2465
End page 2472
Total pages 8
Place of publication Piscataway, NJ, United States
Publisher Institute of Electrical and Electronics Engineers
Collection year 2013
Language eng
Abstract In the design of reflection-type phase shifters, the coupler that represents the shifter's backbone is usually assumed to be a quarter-wavelength 3-dB coupler. In this paper, a derived theoretical model shows that, for certain values for the odd- and even-mode impedances, a coupled structure with a length that is less than one tenth of a wavelength is sufficient to build a high-performance reflection phase shifter. The presented analysis indicates that reflection phase shifters can be designed with a more compact size and larger phase range compared with the conventional method of using a quarter-wavelength 3-dB coupler. However, the required odd-mode impedance in the proposed design is low (≈10 Ω) , whereas the required even-mode impedance is high (≈200 Ω). To realize those impedances when using parallel-coupled lines, slotted ground and shunt chip capacitor are used. The proposed design is supported by full-wave electromagnetic simulations and measurements. The simulated results show that 0.085λ coupled structure achieves 255° phase range across 36% fractional bandwidth with less than 1-dB insertion loss and more than 10-dB return loss. In another design, a full-cycle phase range is obtained with less than 1.5-dB insertion loss across the same band by using two 0.076λ coupled sections. A manufactured prototype for a full-cycle phase range validates the simulation results and, thus, the proposed method.
Keyword Analog phase shifter
Reflectivie phase shifter
Tunable phase shifter
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 8 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 10 times in Scopus Article | Citations
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Created: Mon, 27 Aug 2012, 12:23:03 EST by Dr Amin Abbosh on behalf of School of Information Technol and Elec Engineering