Transdirectional Coupled-Line Couplers Implemented by Periodical Shunt Capacitors

Transdirectional coupled-line couplers have the benefit of perfect input/output isolation. However, for a coupled-line coupler to operate in transdirectional mode, both phase- and impedance-coupling are required, which is difficult to meet by traditional coupled lines. To overcome this problem, this...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2009-12, Vol.57 (12), p.2981-2988
Main Authors: SHIE, Ching-Ian, CHENG, Jui-Ching, CHOU, Sheng-Chun, CHIANG, Yi-Chyun
Format: Article
Language:English
Subjects:
Accuracy
Applied sciences
Bandwidth
Butler matrix
Capacitors
Couplers
Coupling circuits
Dielectric, amorphous and glass solid devices
Directional couplers
Distributed parameter circuits
Electronics
Exact sciences and technology
Hybrid
Impedance
Joining
Microwaves
periodic structure
Planar transmission lines
Power transmission lines
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Shunt capacitors
Simulation
transdirectional coupler
Transmission line matrix methods
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Summary:Transdirectional coupled-line couplers have the benefit of perfect input/output isolation. However, for a coupled-line coupler to operate in transdirectional mode, both phase- and impedance-coupling are required, which is difficult to meet by traditional coupled lines. To overcome this problem, this paper presents a novel transdirectional coupled-line coupler implemented by periodically loaded coupled lines. Two 3-dB 90° hybrids are designed and built to verify this concept. The first one was built on FR-4 substrates and operated at 3.6 GHz. The second one was built on Roger RT/Duroid 5870 substrates with length reduced and operated at 3.6 GHz. A good agreement with simulated results is reached.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2009.2034219