Tri-band/broadband matching techniques for 3-dB branch-line couplers

Tanigawa, S.; Hayashi, Kota; Fujii, T.; Kawai, Tadashi; Ohta, Isao

doi:10.1109/eumc.2007.4405252

Cited by 12 publications

(4 citation statements)

References 7 publications

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“…Especially, Ohta et al extended the method so that it could be applied to the design of various directional couplers with 2‐fold symmetry in Reference 21 and designed a small‐sized hybrid ring in Reference 22. Then, Reference 23 first uses this method to design two kinds of tri‐band branch‐line couplers. After this, Reference 24 presents a tri‐band branch‐line coupler with more flexible operating frequencies.…”

Section: Introductionmentioning

confidence: 99%

Novel multiband ring coupler based on notch filter

Yang

Xie

Zhang

et al. 2020

Int J RF Microw Comput Aided Eng

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A novel method for designing a multiband rat-race ring coupler based on a notch filter is proposed. This method realizes dual-, tri-, quad-, penta-, … band characterizes of coupler using the same structure, two additional branches. So, it has three advantages: (a) simple structure even the number of working bands more than four; (b) achieving the different numbers of working bands with just one structure; (c) useful for almost any kind of wideband passive components because it views them as black boxes. Three prototypes, a tri-band ring coupler (Global System for Mobile Communications 0.9 GHz, Digital Communication System 1.8 GHz, Industrial Scientific Medical 2.45 GHz), a quad-band ring coupler (Time Division Long-Term Evolution 2.3 GHz, Satellite C-Band Downlink 3.8 GHz, Aeronautical Radio Navigation 4.3 GHz, and Satellite C-Band Uplink Applications 6.3 GHz) and a penta-band ring coupler (Frequency Division Long-Term Evolution [LTE-FDD] 0.9, 1.4, 1.8, 2.3, and 2.6 GHz), are simulated and measured. They all use the same structure but different parameters of the added branch. The results validate the functionality of the coupler. The method of designing multiband devices in this study can be used for other passive devices, and the structure is simple.

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Section: Introductionmentioning

confidence: 99%

Novel multiband ring coupler based on notch filter

Yang

Xie

Zhang

et al. 2020

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

show abstract

“…However, all these couplers only achieve a bandwidth narrow than 20%, which limits their applications in broadband systems. To extend the bandwidth of these couplers, the existing approaches for quadrature couplers can be considered. Unfortunately, these approaches only consider the impedance matching and cannot be applied in the coupler structures with arbitrary phase difference.…”

Section: Introductionmentioning

confidence: 99%

A wideband 3 decibels arbitrary phase difference branch line coupler

Gao

Zheng

2018

Micro & Optical Tech Letters

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A wideband 3 dB branch line coupler with arbitrary phase difference between output ports is proposed. The wideband properties in both amplitude and phase are achieved by utilizing λ/4 coupled line sections. By designing different even and odd impedance of the coupled line matched in different ports, small phase imbalance can be achieved. For validation, two 3 dB couplers with different phase differences (60° and 120°) were designed and fabricated. They were measured to exhibit wide bandwidths of 40.2% and 44.6%, respectively.

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Section: Introductionmentioning

confidence: 99%

“…Solutions to design branch-line couplers having more than two operating bands can be found in [22][23][24][25][26]. However, the methods proposed in [22][23][24] are not assisted with a full theoretical analysis that demonstrates the possibility to extend them for an arbitrary number of operating frequencies. Moreover, the approach presented in [25] is limited to correlated frequencies, while the one adopted in [26] exploits the composite right/left handed transmission line concept, resulting in degraded performance and high losses due to the complexity of the circuit and the critical dimensions of some of its constitutive semilumped elements.…”

Section: Introductionmentioning

confidence: 99%

Design method for quasi-optimal multiband branch-line couplers

Piazzon

Saad

Colantonio

et al. 2013

Int J RF and Microwave Comp Aid Eng

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In this article, the design approach, the implementation, and experimental results of multiband branch-line couplers operating at arbitrary frequencies are presented.\ud The conventional branch-line coupler structure is adapted to multiband operation by shunting its four ports with multiband reactive networks. The performance of the proposed multiband couplers is theoretically analyzed and optimized through the even-odd mode circuit analysis. Dual-band (2.4–3.5 GHz), triple-band (1.5–2.4–4.2 GHz), and quad-band (1.5–2.4–3.5 GHz) microstrip branch-line couplers have been realized and tested to verify the design method. The good experimental results (input return loss greater than 15 dB and amplitude imbalance lower than 0.7 dB) show excellent agreement with theoretical and simulated ones, thus validating the proposed approach

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Tri-band/broadband matching techniques for 3-dB branch-line couplers

Cited by 12 publications

References 7 publications

Novel multiband ring coupler based on notch filter

Novel multiband ring coupler based on notch filter

A wideband 3 decibels arbitrary phase difference branch line coupler

Design method for quasi-optimal multiband branch-line couplers

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