Synthesis and Design of Wideband Dual-Band Bandpass Filters With Controllable In-Band Ripple Factor and Dual-Band Isolation

Zhang, Runqi; Li, Zhu

doi:10.1109/tmtt.2013.2256145

Cited by 41 publications

(41 citation statements)

References 26 publications

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“…Transmission line loop or ring related structures have been widely used in microwave/RF passive circuits, such as bandpass filter (BPF), bandstop filter, allpass filter, and directional couplers . Besides its high Quality‐factor as a single‐mode resonator, another two attractive features of a transmission line loop for filter applications are the signal‐interference and the multiple‐mode resonance . The signal‐interference, from multiple paths between the external ports connected to one loop, can generate unusual frequency responses .…”

Section: Introductionmentioning

confidence: 99%

“…In this work, the discussion is centered around a stub‐loaded loop structure, mainly about the bandpass characteristics. The stub‐loaded loop can be found in many BPF designs . For most of them, however, the in‐band group delay is ignored or uncontrolled when the bandwidth and the magnitude ripple are determined.…”

Section: Introductionmentioning

confidence: 99%

“…Transmission line loop or ring related structures have been widely used in microwave/RF passive circuits, 1 such as bandpass filter (BPF), [2][3][4][5][6][7][8][9][10][11][12] bandstop filter, [12][13][14][15][16] allpass filter, 17 and directional couplers. 1,18 Besides its high Quality-factor as a single-mode resonator, 2 another two attractive features of a transmission line loop for filter applications are the signalinterference [12][13][14] and the multiple-mode resonance.…”

Section: Introductionmentioning

confidence: 99%

“…1,18 Besides its high Quality-factor as a single-mode resonator, 2 another two attractive features of a transmission line loop for filter applications are the signalinterference [12][13][14] and the multiple-mode resonance. [3][4][5][6][7][8][9]15 The signal-interference, from multiple paths between the external ports connected to one loop, can generate unusual frequency responses. 12 The multiple-mode resonance in a single loop resonator, especially the orthogonal modes, are widely utilized in BPFs from narrowband [3][4][5][6] to wideband 7,8 applications.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Stub-loaded square loop bandpass filter with equiripple response in both delay and magnitude

Jin

Huang

Chen

et al. 2018

Int J RF Microw Comput Aided Eng

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It is shown that a stub loaded square loop filter, composed of six sections of commensurate transmission line, can achieve equiripple response in both magnitude and group delay simultaneously, when the admittances of the lines are properly chosen. Design formulas are given to calculate the admittances by given specifications such as fractional bandwidth and in‐band magnitude ripple. An interesting property of this filter is that the group delay can be adjusted while the in‐band magnitude response keeps almost unchanged. For verification, a filter sample is designed, fabricated and measured. In experiment, it exhibits a delay variation of 0.22 ns and minimal insertion loss of 0.21 dB within its passband (|S11| < −13.8 dB) from 0.48 to 1.52 GHz, which agree well with the theoretical predictions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stub-loaded square loop bandpass filter with equiripple response in both delay and magnitude

Jin

Huang

Chen

et al. 2018

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

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“…Conventional approaches to the realization of DBBP filters make use of a variety of structures, such as comblines , signal interference , C‐sections , spurlines , and separate signal paths . An extensive class of structures make use of coupled stepped impedance resonators or coupled lines , multimode resonators or various stepped stubs or stepped impedance resonators .…”

Section: Introductionmentioning

confidence: 99%

An asymmetrical dual band bandpass filter

Malherbe

2016

Micro & Optical Tech Letters

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A dual band bandpass filter consisting of a cascade of unit elements and shunt connected stepped open and stepped short circuited stubs, is described. The dual passbands can have unequal, asymmetrical width; the stop‐bandwidth between the desired bands and the harmonic upper bands is substantially increased. A prototype filter that finds application in communication systems is developed. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:163–168, 2017

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New multi‐standard dual‐wideband and quad‐wideband asymmetric step impedance resonator filters with wide stop band restriction

Al‐Yasir

Parchin

et al. 2019

Int J RF Microw Comput Aided Eng

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New multi‐standard wide band filters with compact sizes are designed for wireless communication devices. The proposed structures realize dual‐wideband and quad‐wideband characteristics by using a new skew‐symmetrical coupled pair of asymmetric stepped impedance resonators, combined with other structures. The first and second dual‐wideband filters realize fractional bandwidths (FBW) of 43.2%/31.9% at the central frequencies (CF) of 1.875/1.63 GHz, and second bandwidths of 580 MHz/1.75 GHz at CF of 5.52/4.46 GHz, respectively. The proposed quad‐band filter realizes its first/second/third/fourth pass bands at CF 2.13/5.25/7.685/9.31 GHz with FBW of 46.0%/11.4%/4.6% and 5.4%, respectively. The wide pass bands are attributed to the mutual coupling of the modified ASIR resonators and their bandwidths are controllable by tuning relative parameters while the wide stop band performance is optimized by the novel interdigital cross coupled line structure and parallel uncoupled microstrip line structure. Moreover, the quad band is generated by introducing the novel defected rectangle structure. These multi‐standard filters are simulated, fabricated and measured, and measured results agree well with both simulated results and theory predictions. The good in‐band and out‐of‐band performances, the miniaturized sizes and simple structures of the proposed filters make them very promising for applications in future multi‐standard wireless communication.

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Synthesis and Design of Wideband Dual-Band Bandpass Filters With Controllable In-Band Ripple Factor and Dual-Band Isolation

Cited by 41 publications

References 26 publications

Stub-loaded square loop bandpass filter with equiripple response in both delay and magnitude

Stub-loaded square loop bandpass filter with equiripple response in both delay and magnitude

An asymmetrical dual band bandpass filter

New multi‐standard dual‐wideband and quad‐wideband asymmetric step impedance resonator filters with wide stop band restriction

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