Broadband low-loss impedance transforming rat-race coupler in suspended microstrip technique

Smolarz, Robert; Wincza, Krzysztof; Gruszczyński, Sławomir

doi:10.23919/mikon.2018.8405204

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…Due to the fact that such couplers feature narrow bandwidth, their applicability is limited. To enhance the operational bandwidth novel rat-race coupler's topologies have been proposed, where a classic 270 • -long transmission line section is replaced by a shorted-coupled-line section [13], which in turn, can complicate the fabrication process. Thus, methods of enhancing operational bandwidths are still the subject of research.…”

Section: Introductionmentioning

confidence: 99%

Chebyshev-Response Branch-Line Couplers with Enhanced Bandwidth and Arbitrary Coupling Level

2020

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A new approach to the synthesis of broadband branch-line couplers with arbitrary coupling level was investigated in this paper. It was shown that the operational bandwidth of a classic branch-line coupler can be increased by utilizing N-section impedance transformers added to each of the coupler’s ports. Furthermore, the obtained response can be approximated by the Chebyshev polynomial. Moreover, it was proven that for such couplers a range of coupling coefficient values can be obtained by the modification of classic branch-line topology. The analysis of the electrical parameters of the proposed branch-line couplers was comprehensively investigated. To verify the correctness of the proposed design procedures, 3-dB, and 6-dB broadband branch-line couplers operating at the center frequency of 2 GHz having return losses greater than 20 dB were designed, fabricated, and measured.

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Section: Introductionmentioning

confidence: 99%

Chebyshev-Response Branch-Line Couplers with Enhanced Bandwidth and Arbitrary Coupling Level

2020

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Wideband and compact rat‐race coupler for fifth‐generation N77/N78/N79 applications

Zhou

Zhang

et al. 2020

Micro & Optical Tech Letters

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A wideband and compact rat‐race coupler that covers 3 to 5 GHz is proposed for the fifth‐generation new radio N77/N78/N79 applications. The wideband characteristic is obtained by using cascaded two‐section topology and broadside‐coupled lines at each input/output port. Miniaturization of two‐section rings is achieved using meander microstrip lines. A fractional bandwidth of 50% and a size reduction of 60% are both reached. Good in‐phase and out‐of‐phase characteristics are obtained as well. The circuit can be easily fabricated using conventional printed circuit board process and suitable for mass production.

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Broadband low-loss impedance transforming rat-race coupler in suspended microstrip technique

Cited by 2 publications

References 8 publications

Chebyshev-Response Branch-Line Couplers with Enhanced Bandwidth and Arbitrary Coupling Level

Chebyshev-Response Branch-Line Couplers with Enhanced Bandwidth and Arbitrary Coupling Level

Wideband and compact rat‐race coupler for fifth‐generation N77/N78/N79 applications

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