NDLI: Simple ladder-like single-layer balanced wideband phase shifter with wide phase shift range and appropriate common-mode suppression

Content Provider	IET Digital Library
Author	Alizadeh, Mohammad Karim Shamsi, Hossein Tavakoli, Mohammad Bagher Aliakbarian, Hadi
Abstract	In this study, a single-layer balanced wideband phase shifter with a wide phase shift range of 45°–315° and acceptable common-mode (CM) suppression is proposed. The main branch has a simple ladder-like structure and the reference branch utilises a coupling structure. The main branch electrical length is constant for any desired differential-mode (DM) phase shift. Assuming a specific return loss (e.g. 16, 20, and 25 dB), the phase shifter is carefully analysed and a design procedure is given leading to an ultra-low phase error design. Then by making a trade-off between the CM and DM bandwidths at the cost of higher phase error, more design solutions for the phase shifter are given. To validate both the proposed structure as well as its design procedure, a balanced wideband phase shifter with the DM phase shift of 180°±4.2° (1.851–4.017 GHz) and the CM suppression of better than 15 dB (1.81–4 GHz) is fabricated, resulting in 73.82 and 75.25% fractional bandwidth, respectively. The fabricated balanced phase shifter has a return loss of S 11 dd < − 14.87 dB and insertion loss of S 21 dd > − 0.95 dB . The synthesised, simulated, and measured results are in good agreement with each other.
Starting Page	1137
Ending Page	1147
Page Count	11
ISSN	17518725
Volume Number	14
e-ISSN	17518733
Issue Number	Issue 10, Aug (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/14/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2020.0221
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2020-05-15
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Balanced Phase Shifter Common-mode Suppression Differential-mode Phase Shift DM Phase Shift Frequency 1.81 GHz to 4.0 GHz Frequency 1.851 GHz to 4.017 GHz Ladder-like Single-layer Balanced Wideband Phase Shifter Main Branch Electrical Length Microwave Circuit And Device Microwave Phase Shifters UHF Couplers UHF Phase Shifters Ultra-low Phase Error Design Waveguide And Microwave Transmission Line Component Wide Phase Shift Range
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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