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- Title
Wideband arbitrary phase-difference coupled-line coupler with tight coupling coefficient and small phase variation.
- Authors
Liang Gao; Zeeshan Qamar; Hong Lin Zhang; Shao Yong Zheng
- Abstract
In this study, a planar arbitrary phase-difference coupled-line coupler having wide bandwidth, tight coupling coefficient, and small phase variation are proposed. The proposed coupler consists of two quarter-wavelength coupled-line sections connected with two different transmission lines. Moreover, the interconnection transmission line can be designed as a small phase variation phase shifter with the introduction of a shorted stub. The detailed theoretical analysis is provided to illustrate the design concept. The circuit parameters of this novel arbitrary phase-difference coupler can be easily determined by the derived closed-form equations. For verification, two 3 dB couplers with 45°/135° and 60°/120° phase differences are fabricated and measured. The 45°/135° coupler achieves 34.2% fractional bandwidth for 45° phase difference with 2° phase variation and 36.3% fractional bandwidth for 135° phase difference with 3.4° phase variation. Moreover, the 60°/120° coupler achieves 30% fractional bandwidth for 60° phase difference with 0.9° phase variation and 32.9% fractional bandwidth for 120° phase difference with 1.5° phase variation.
- Subjects
BROADBAND communication systems; DIRECTIONAL couplers; PHASE shifters; BANDPASS filters; MICROSTRIP transmission lines
- Publication
IET Microwaves, Antennas & Propagation (Wiley-Blackwell), 2018, Vol 12, Issue 15, p2356
- ISSN
1751-8725
- Publication type
Article
- DOI
10.1049/iet-map.2018.5383