Balanced Rat-Race Couplers With Wideband Common-Mode Suppression

Feng, Wenjie; Che, Wenquan; Shi, Yongrong; Gómez‐García, Roberto; Wang, Chenxu; Xue, Quan; Zhang, Xiu Yin; Zhou, Xin Yu

doi:10.1109/tmtt.2019.2946158

Cited by 23 publications

(14 citation statements)

References 24 publications

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“…However, most of the reported balanced FRCs are BTB components, which are only applied to fully balanced systems. Considering the connection and coexistence between balanced and unbalanced systems, BTU FRCs are indispensable [17][18][19]. The first BTU rat-race-coupler is presented based on microstrip transmissionline in [17].…”

Section: Introductionmentioning

confidence: 99%

Balanced‐to‐unbalanced and balanced‐to‐balanced filtering rat‐race couplers using multilayer substate integrated waveguide cavities

Wang

Zhou

Zhang

et al. 2021

IET Microwaves Antenna & Prop

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This study reports a class of balanced-to-unbalanced (BTU) and balanced-to-balanced (BTB) filtering rat-race couplers (FRCs) based on multilayer substrate integrated waveguide (SIW) cavities. Input and output ports can perform the functions of balanced and unbalanced terminals to implement various operating states. The theoretical designs consisting of the mixed-mode scattering matrix and mode analysis are discussed in detail. Good differential-mode (DM) bandpass filtering (BPF) responses are obtained by two pairs of orthogonal degenerate modes in multilayer SIW cavities. Meanwhile, high common-mode (CM) suppression and port-to-port isolation are realized inherently due to mode distributions of the square SIW resonator. Accordingly, to verify the design concept, two types of BTU FRCs and one type of BTB FRC are designed and fabricated, respectively. Moreover, the measured results agree well with the simulated ones, exhibiting high performances in terms of CM suppression, magnitude/phase imbalance as well as port matching/isolation characteristics. K E Y W O R D Sbalanced-to-balanced, balanced-to-unbalanced, filtering rat-race couplers, substate integrated waveguideThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Section: Introductionmentioning

confidence: 99%

Balanced‐to‐unbalanced and balanced‐to‐balanced filtering rat‐race couplers using multilayer substate integrated waveguide cavities

Wang

Zhou

Zhang

et al. 2021

IET Microwaves Antenna & Prop

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“…In these couplers, 1,3,5‐8 the hybrid coupler and branch‐line coupler methodologies are commonly applied. Besides, the impedance‐transforming concept is used for the 3‐dB coupler, 9 and rat‐race balanced couplers are also proposed with common‐mode suppression for differential system application 10‐11 …”

Section: Introductionmentioning

confidence: 99%

Stripline forward‐wave directional coupler based on double multi‐via mushroom and short‐circuited branch line

Shi

Shen

et al. 2021

Int J RF Microw Comput Aided Eng

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A stripline forward‐wave directional coupler is proposed using periodical double multi‐via mushroom structures and short‐circuited branch lines in this paper. By adding the short‐circuited branch lines to the coupled lines and the patch of the upper or lower mushroom structure, the operating bandwidth is enhanced for the unit cell design. The even/odd mode phase difference of one unit cell is located within 20 ~ 30° from 6.1 to 6.7 GHz with an acceptable even/odd mode Bloch impedance mismatching. Finally, a prototype is fabricated by multi‐layer printed circuit broad technology and measured. The agreement is achieved between the simulated and measured results.

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“…T he rapid development of modern communication systems has put forward more stringent requirements for active and passive devices. Among them, bandpass filter (BPF) and rat‐race coupler (RRC) play crucial roles in the microwave and millimeter wave systems 1–4 . Conventionally, as shown in Figure 1A, both the typical components are cascade in the front‐end modules.…”

Section: Introductionmentioning

confidence: 99%

Miniaturized filtering rat‐race coupler based on hybrid circular substrate integrated waveguide and coplanar waveguide resonators

Wang

Zong

2021

Int J RF Mic Comp-Aid Eng

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In this paper, an approach to designing filtering rat‐race coupler (FRRC) with hybrid circular substrate integrated waveguide (CSIW) and coplanar waveguide (CPW) resonators is proposed. The FRRC is developed in a single CSIW cavity embedded with four CPW resonators and four feeding ports, featuring miniaturized size. The desired 0° and 180° phase characteristics of the RRC are realized by the inherent in‐phase and out‐of‐phase electromagnetic fields of the dual‐mode CSIW cavity. By properly arranging the sum, difference and other two output ports, the FRRC is exploited to achieve the desired properties of a RRC with bandpass filtering responses. In addition, transmission zeros are generated in the vicinity of the upper stopband. For validation and demonstration, a miniaturized FRRC utilizing hybrid CSIW and CPW resonators is synthesized, fabricated and experimented in a single‐layered process. Comparisons with previously state‐of‐the‐art research, the proposed FRRC prototype indicates the superiorities of miniaturized footprint, high‐quality‐factor, high‐order filtering response and enhanced out‐of‐band rejection.

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Balanced Rat-Race Couplers With Wideband Common-Mode Suppression

Cited by 23 publications

References 24 publications

Balanced‐to‐unbalanced and balanced‐to‐balanced filtering rat‐race couplers using multilayer substate integrated waveguide cavities

Balanced‐to‐unbalanced and balanced‐to‐balanced filtering rat‐race couplers using multilayer substate integrated waveguide cavities

Stripline forward‐wave directional coupler based on double multi‐via mushroom and short‐circuited branch line

Miniaturized filtering rat‐race coupler based on hybrid circular substrate integrated waveguide and coplanar waveguide resonators

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