LTCC Filtering Rat-Race Coupler Based on Eight-Line Spatially-Symmetrical Coupled Structure

Wang, Kai Xu; Liu, Xiaofeng; Li, Yuan Chun; Lin, Li Zhao; Zhao, Xiao-Lan

doi:10.1109/access.2017.2720593

Cited by 23 publications

(20 citation statements)

References 26 publications

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“…In Reference , the 3‐D dielectric resonator (DR) structure with large vertical height is not suitable to integration with planar circuits as compared to the proposed structures. By using multilayer structures, the circuits in References realize smaller size. However, the multilayer structure is more complex, which increases the difficulty in fabrication and thus increases the processing cost .…”

Section: Comparisonmentioning

confidence: 99%

“…(a) Two ports are placed at one side, and others are placed at the opposite side; (b) The distance between each two ports is determined by the required electric length; (c) Ports are mutually orthogonal . A filtering rat‐race coupler implemented in low‐temperature co‐fired ceramic (LTCC) technology is presented in Reference . In addition, the ways of realizing in‐phase and out‐of‐phase operations have critical effect on system topology.…”

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%

“…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 3 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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Section: Comparisonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…The disadvantage of LTCC is that the size of the ceramic and the processing plate shrink after firing. In addition, modules must have heat sinks due to the requirement of heat dissipation after heating [2,3]. MMICs based on GaAs and other excellent III-V materials can be used to develop devices operating at the millimeter-wave band, which offers higher functional capabilities, improved system stability, and reduced weight, size, and cost [4].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of QFN-Packaged Miniaturized GaAs-Based Bandpass Filter with Intertwined Inductors and Dendritic Capacitor

et al. 2020

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This article presents a compact quad flat no-lead (QFN)-packaged second-order bandpass filter (BPF) with intertwined inductors, a dendritic capacitor, and four air-bridge structures, which was fabricated on a gallium arsenide (GaAs) substrate by integrated passive device (IPD) technology. Air-bridge structures were introduced into an approximate octagonal outer metal track to provide a miniaturized chip size of 0.021 × 0.021 λ0 (0.8 × 0.8 mm2) for the BPF. The QFN-packaged GaAs-based bandpass filter was used to protect the device from moisture and achieve good thermal and electrical performances. An equivalent circuit was modeled to analyze the BPF. A description of the manufacturing process is presented to elucidate the physical structure of the IPD-based BPF. Measurements were performed on the proposed single band BPF using a center frequency of 2.21 GHz (return loss of 26.45 dB) and a 3-dB fractional bandwidth (FBW) of 71.94% (insertion loss of 0.38 dB). The transmission zero is located at the 6.38 GHz with a restraint of 30.55 dB. The manufactured IPD-based BPF can play an excellent role in various S-band applications, such as a repeater, satellite communication, and radar, owing to its miniaturized chip size and high performance.

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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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LTCC Filtering Rat-Race Coupler Based on Eight-Line Spatially-Symmetrical Coupled Structure

Cited by 23 publications

References 26 publications

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

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

Fabrication of QFN-Packaged Miniaturized GaAs-Based Bandpass Filter with Intertwined Inductors and Dendritic Capacitor

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

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