Compact Quad-Band Bandpass Filter Using Quad-Mode Stepped Impedance Resonator and Multiple Coupling Circuits

Bukuru, Denis; Song, Kaijun; Zhang, Fan; Zhu, Yu; Fan, Maoyu

doi:10.1109/tmtt.2016.2638814

Cited by 48 publications

(43 citation statements)

References 27 publications

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“…Moreover, owing to the advantages of lower cost, easier fabrication, and flexible multiband design approach, the microstrip quad‐band BPF based on the hybrid substrate has attracted much attention as the focus of a large number of studies . For example, Reference proposes a microstrip quad‐band BPF constructed by introducing improved coplanar waveguide (CPW)‐fed and the DGS via dual‐mode perturbations with dual‐mode double square‐ring resonators to achieve high out‐of‐band rejection and low IL.…”

Section: Introductionmentioning

confidence: 99%

“…As two common resonators employing to achieve multiband design, stub‐loaded resonator (SLR) and SIR were also utilized in the quad‐band BPF implementation. A compact quad‐band BPF combined a multi‐SLR and a short‐end SLR was realized in Reference via coupling stubs with an advantage of four individually controllable passbands. And in Reference , a quad‐mode SIR was proposed and a quad‐band BPF was designed with a pair of half‐wavelength inter‐coupled quad‐mode SIRs and two open‐loop SIRs, which also providing flexible design procedure.…”

Section: Introductionmentioning

confidence: 99%

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A quad‐band bandpass filter using sept‐mode double square‐ring loaded resonator

Zhu

Wang

Kim

et al. 2020

Micro & Optical Tech Letters

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A quad‐band bandpass filter (BPF) using a sept‐mode double square‐ring loaded resonator (DSRLR) is presented in this article. Based on the symmetrical geometric construction of the DSRLR, the even‐ and odd‐mode analysis with theoretical equations is employed to analyze the proposed BPF, and current density are obtained. Additionally, multimode splitting and resonant characteristics of the proposed DSRLR are explored. Accordingly, the design procedure is given after a pair of feedlines with dual‐finger structure is added to the I/O ports to introduce extra transmission zeros (TZs). Four TZs—including two created by the dual‐finger feedlines—are produced to separate four passbands that exhibit a sharp skirt and high stopband rejection. Finally, a microstrip quad‐band BPF is fabricated on a Teflon substrate with four measured passbands centered at 2.46, 3.41, 6.65, and 9.09 GHz with insertion losses of 0.68, 0.73, 0.81, and 1.23 dB, respectively. A satisfactory agreement is achieved between the measurement results and full‐wave simulation results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A quad‐band bandpass filter using sept‐mode double square‐ring loaded resonator

Zhu

Wang

Kim

et al. 2020

Micro & Optical Tech Letters

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“…However, this kind of BPFs is often hard to realize higher order responses and always suffers a large circuit size because of the inevitable great numbers of resonators. The third method we commonly adopted is to fully exploit the first several resonances of multimode resonators . However, they are usually limited by nonindependent coupling control and complicated structures.…”

Section: Introductionmentioning

confidence: 99%

Analysis of four‐stage stepped‐impedance resonators and their application to quad‐band microstrip bandpass filter

Xie

Zhou

et al. 2019

Int J RF Microw Comput Aided Eng

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Four‐stage stepped‐impedance resonator (FSSIR) is proposed and its resonant characteristics are analyzed in detail. The formulas of the first four resonances are deduced and the optimization techniques are presented on the basis of the impedance ratios. A quad‐band bandpass filter with third‐order filtering response in each passband is synthesized and designed as a demonstration of the application of the proposed FSSIR. Thanks to the cross‐coupling topology and skew‐symmetrical feeding configuration, multiple transmission zeros have been generated out of the passbands. Additionally, the frequency and the couplings of each passband can be flexibly controlled, respectively.

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“…In general, the quad‐band BPF has a complex structure, and therefore, many design parameters are required . An eight‐mode resonator was used as a quad‐band BPF in Reference .…”

Section: Introductionmentioning

confidence: 99%

“…However, the number of transmission zeroes was only three. A compact quad‐band BPF using a quad‐mode stepped‐impedance resonator was investigated in Reference . However, the insertion loss was too high at the high‐frequency band.…”

Section: Introductionmentioning

confidence: 99%

Simple quad‐band bandpass filter implemented on a 50‐Ω microstrip line

Sung

2019

Micro & Optical Tech Letters

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In this study, we implement a compact quad‐band bandpass filter (BPF) on a 50‐Ω microstrip line. The proposed structure comprises an input/output stage with one end terminated at a 50‐Ω C‐shaped open‐loop resonator. When the gap between the input stage and the output stage is located at the center and the filter structure is symmetric, it acts as a dual‐band BPF, but when the gap moves and the filter structure becomes asymmetric, it acts as a quad‐band BPF. The proposed structure is very small in size because it is implemented on a 50‐Ω line without any additional space. Even though it supports four frequency bands, the design complexity is minimized by reducing the number of design parameters. In addition, analysis of the current distribution and parameter study suggest a method to control only one or two specific resonant frequencies among four resonant frequencies. The fabricated BPF demonstrates four passbands located at 1.5, 3.6, 5.4, and 7.2 GHz. Within the four passbands, the minimum insertion losses are 0.2, 0.6, 1.8, and 1.7 dB, respectively.

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Compact Quad-Band Bandpass Filter Using Quad-Mode Stepped Impedance Resonator and Multiple Coupling Circuits

Cited by 48 publications

References 27 publications

A quad‐band bandpass filter using sept‐mode double square‐ring loaded resonator

A quad‐band bandpass filter using sept‐mode double square‐ring loaded resonator

Analysis of four‐stage stepped‐impedance resonators and their application to quad‐band microstrip bandpass filter

Simple quad‐band bandpass filter implemented on a 50‐Ω microstrip line

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