Transdirectional coupled-line couplers implemented by periodical shunt capacitors

Ching Ian Shie; Jui Ching Cheng; Sheng Chun Chou; Yi Chyun Chiang

doi:10.1109/TMTT.2009.2034219

Transdirectional coupled-line couplers implemented by periodical shunt capacitors

Ching Ian Shie
, Jui Ching Cheng
, Sheng Chun Chou
, Yi Chyun Chiang

Department of Electronic Engineering

Research output: Contribution to journal › Article › peer-review

80 Scopus citations

Abstract

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.

Original language	English
Article number	5338002
Pages (from-to)	2981-2988
Number of pages	8
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	57
Issue number	12
DOIs	https://doi.org/10.1109/TMTT.2009.2034219
State	Published - Dec 2009

Bibliographical note

Funding Information:
Manuscript received May 28, 2009; revised August 03, 2009. First published November 17, 2009; current version published December 09, 2009. This work was supported by the National Science Council (NSC), Taiwan, under Contract NSC95-2221-E-182-065.

Keywords

Hybrid
Periodic structure
Transdirectional coupler

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10.1109/TMTT.2009.2034219

Cite this

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title = "Transdirectional coupled-line couplers implemented by periodical shunt capacitors",

abstract = "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.",

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N1 - Funding Information: Manuscript received May 28, 2009; revised August 03, 2009. First published November 17, 2009; current version published December 09, 2009. This work was supported by the National Science Council (NSC), Taiwan, under Contract NSC95-2221-E-182-065.

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N2 - 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.

AB - 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.

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Transdirectional coupled-line couplers implemented by periodical shunt capacitors

Abstract

Bibliographical note

Keywords

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