Generalised capacitive-loading method for miniaturisation of forward-wave directional coupled-line couplers with arbitrary strip impedances and coupling levels

Jungje Ha, Yongshik Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This study demonstrates a capacitive reactive loading method for forward-wave couplers based on coupled lines. With the method, a miniaturised forward-wave coupler can be designed by loading either a symmetric or an asymmetric coupled line with shunt capacitors symmetrically or asymmetrically. The method is a generalised version of all previous shunt capacitive loading methods for miniaturisation of forward-wave coupled-line couplers since it provides complete control of not only the maximum coupling level, but also the impedances of the two strips. For the first time, a forward-wave coupled-line coupler is demonstrated that provides an arbitrary maximum coupling level based on 50-Ω lines. Therefore, lengthy and/or complicated impedance matching networks can be eliminated, a more effective miniaturisation is enabled, and performance degradation associated with the additional circuitry is minimised. Experimental results of various forward-wave couplers based on quasi-symmetric and asymmetric coupled lines with various coupling levels and strip impedances are provided to demonstrate the versatility of the proposed method.

Original languageEnglish
Pages (from-to)494-501
Number of pages8
JournalIET Microwaves, Antennas and Propagation
Volume10
Issue number5
DOIs
Publication statusPublished - 2016 Apr 13

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Capacitors
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All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

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abstract = "This study demonstrates a capacitive reactive loading method for forward-wave couplers based on coupled lines. With the method, a miniaturised forward-wave coupler can be designed by loading either a symmetric or an asymmetric coupled line with shunt capacitors symmetrically or asymmetrically. The method is a generalised version of all previous shunt capacitive loading methods for miniaturisation of forward-wave coupled-line couplers since it provides complete control of not only the maximum coupling level, but also the impedances of the two strips. For the first time, a forward-wave coupled-line coupler is demonstrated that provides an arbitrary maximum coupling level based on 50-Ω lines. Therefore, lengthy and/or complicated impedance matching networks can be eliminated, a more effective miniaturisation is enabled, and performance degradation associated with the additional circuitry is minimised. Experimental results of various forward-wave couplers based on quasi-symmetric and asymmetric coupled lines with various coupling levels and strip impedances are provided to demonstrate the versatility of the proposed method.",
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N2 - This study demonstrates a capacitive reactive loading method for forward-wave couplers based on coupled lines. With the method, a miniaturised forward-wave coupler can be designed by loading either a symmetric or an asymmetric coupled line with shunt capacitors symmetrically or asymmetrically. The method is a generalised version of all previous shunt capacitive loading methods for miniaturisation of forward-wave coupled-line couplers since it provides complete control of not only the maximum coupling level, but also the impedances of the two strips. For the first time, a forward-wave coupled-line coupler is demonstrated that provides an arbitrary maximum coupling level based on 50-Ω lines. Therefore, lengthy and/or complicated impedance matching networks can be eliminated, a more effective miniaturisation is enabled, and performance degradation associated with the additional circuitry is minimised. Experimental results of various forward-wave couplers based on quasi-symmetric and asymmetric coupled lines with various coupling levels and strip impedances are provided to demonstrate the versatility of the proposed method.

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