Concept for narrow‐band filtering rat‐race coupler using dual‐mode cross‐shaped dielectric

Jiao, Lingxiao; Wu, Yongle; Liu, Yuanan; Wang, Weimin; Chen, Jianxin

doi:10.1049/el.2015.3108

Cited by 20 publications

(15 citation statements)

References 8 publications

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“…Some couplers integrated with filtering responses or wide out-of-band rejection suppression performances have been proposed in [8][9][10][11][12][13][14][15][16], which have the advantages of compact size and reduced insertion loss. A novel narrow-band filtering rat-race coupler (FRC) is reported in [8] by employing a dual-mode cross-shaped dielectric resonator. Based on substrateintegrated waveguide, a rat-race coupler with passband selectivity is presented in [9].…”

Section: Introductionmentioning

confidence: 99%

Filtering rat‐race couplers with impedance transforming characteristics based on terminated coupled line structures

Dong

Wang

et al. 2020

IET Microwaves, Antennas & Propagation

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In this study, a series of rat‐race couplers with bandpass filtering responses and impedance transforming characteristics are presented based on novel coupled‐line structures. Firstly, a novel filtering rat‐race coupler core circuit is proposed by introducing coupled‐line structures into conventional rat‐race coupler. Then, a series of rat‐race couplers with enhanced filtering responses and stopband rejections are constructed by employing various types of impedance transformers. The even‐ and odd‐mode methods are adopted to explain the operating mechanisms. Finally, a filtering rat‐race coupler prototype with a fractional bandwidth of 35.2% is designed and measured. The measured results show high passband selectivity, good out‐of‐band rejection and isolation performances, which is attractive for practical application.

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Section: Introductionmentioning

confidence: 99%

Filtering rat‐race couplers with impedance transforming characteristics based on terminated coupled line structures

Dong

Wang

et al. 2020

IET Microwaves, Antennas & Propagation

Self Cite

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“…However, the abovementioned filtering couplers suffer from the Q factor limitation and thus are not suitable for high‐frequency operations. To achieve high Q factor, the dielectric resonator (DR) filtering couplers have been designed for narrowband applications …”

Section: Introductionmentioning

confidence: 99%

“…A compact multilayer dual-mode filter based on the substrate integrated waveguide circular cavity (SICC) is developed in Reference 9. To further reduce size, a single device integrated with different functionalities, such as filtering coupler, [11][12][13][14][15][16][17][18][19][20][21][22] has been attracting increasing attention. It also recommends an effective way to avoid the performance degradation due to a cascade connection of two individual components.…”

Section: Introductionmentioning

confidence: 99%

“…To achieve high Q factor, the dielectric resonator (DR) filtering couplers have been designed for narrowband applications. 16,17 On the other hand, the port of the components should be placed at proper positions to meet the requirement of system topology and interconnect. Recently, the existed couplers have several different types of topologies.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the existed couplers have several different types of topologies. (a) Two ports are placed at one side, and others are placed at the opposite side 11,12,16,21 ; (b) The distance between each two ports is determined by the required electric length 14,15,17,18 ; (c) Ports are mutually orthogonal. 19,20 A filtering rat-race coupler implemented in lowtemperature co-fired ceramic (LTCC) technology is presented in Reference 18.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Compact substrate integrated waveguide rat‐race filtering couplers with arbitrary angular interval between ports

Zhang

Cheng

Yang

et al. 2020

Int J RF Microw Comput Aided Eng

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A new type of compact filtering rat‐race couplers with arbitrary port direction based on different shape substrate integrated waveguide (SIW) cavity are first proposed in this paper. Different shaped SIW resonators can be combined together to achieve better performance and flexible topology. Resonant frequencies of fan‐shaped SIW cavity with various central angles have been derived to construct the resonant cells and obtain different topological structures. Moreover, interdigital capacitor SIW unit loaded on the common wall between cavities is used to achieve negative coupling structure. The detailed analysis and the design method have been introduced to realize a filtering rat‐race coupler based on substrate integrated fan‐shaped cavity (SIFC) and rectangular cavity. In particular, the combination of different shaped resonators can be selected according to the requirement of port angle interval. In order to further verify the method, the other filtering rat‐race coupler is fabricated using four SIFCs to achieve more available port angle intervals. Compared with other filtering couplers, the proposed designs exhibit good filtering responses, high Q factor, amplitude balance, as well as 0° and 180° phase differences. Furthermore, various angular intervals for input/output ports are convenience to meet the requirement of system topology and interconnect.

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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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Concept for narrow‐band filtering rat‐race coupler using dual‐mode cross‐shaped dielectric

Cited by 20 publications

References 8 publications

Filtering rat‐race couplers with impedance transforming characteristics based on terminated coupled line structures

Filtering rat‐race couplers with impedance transforming characteristics based on terminated coupled line structures

Compact substrate integrated waveguide rat‐race filtering couplers with arbitrary angular interval between ports

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

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