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Compact wide stopband superconducting bandpass filter using modified spiral resonators with interdigital structure

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Chinese Physics B 2018年第6期27卷 513-517页

作者：吴荻魏斌李博郭旭波卢新祥曹必松 State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Department of Physics and Electronic Engineering Shaoxing University

In this study, we propose a novel resonator that is composed of a modified spiral with an embedded interdigital capacitor. A large ratio of the first spurious frequency to the fundamental resonant frequency is obtained, which is suitable for the design of filters with wide stopbands, and the circuit size is considerably reduced by embedding the interdigital structure in the spiral. For demonstration, a compact four-pole high temperature superconducting（HTS） filter with a center frequency of 568 MHz is designed and fabricated on double-sided YBCO film with a size of 11.4 mm×8.0 mm. The filter measurement shows excellent performance with an out-of-band rejection level better than 60.9 dB up to 3863 MHz.

关键词： high-temperature superconducting bandpass filter microstrip filter wide stopband

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High-temperature superconducting filter using self-embedding asymmetric stepped impedance resonator with wide stopband performance and miniaturized size

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Chinese Physics B 2017年第10期26卷 477-482页

作者：王丹魏斌衡勇曹必松 State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing Institute of Electronic System Engineering

In this study, a novel self-embedding asymmetric stepped impedance resonator （SE-ASIR） topology is proposed. By embedding asymmetric stepped impedance resonators in themselves, circuit sizes of ASIRs can be reduced effectively, while the ability to control spurious modes of ASIRs remains. Therefore, SE-ASIRs are suitable for being used to design filters with wide stopbands and miniaturized sizes. Furthermore, the construction process of the SE-ASIR is described in detail, and an equivalent model of the SE-ASIR is proposed. For demonstration, a high-temperature superconducting bandpass filter centered at 1112 MHz is designed and fabricated. The measured result agrees well with the simulation result and shows that the out-of-band rejection is better than 60 dB up to 4088 MHz, which is about 3.7 times the center frequency. The filter circuit size is 31 mm × 13 mm or 0.28λg × 0.12λg, where g is the guided wavelength at 1112 MHz.

关键词： high-temperature superconducting bandpass filter microstrip filter wide stopband

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COMPACT BANDPASS FILTER WITH HIGH SELECTIVITY AND wide stopband USING SLOTTED STEPPED-IMPEDANCE RESONATOR

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Journal of Electronics(China) 2012年第1期29卷 23-26页

作者： X11Jin JiYuxue MiaoChen WuWen MinisterialKeyLaboratoryofJGMT NanjingUniversityofScienceandTechnologyNanjing210094China

In this paper,a Slotted Stepped-Impedance Resonator (SSIR) is proposed.Due to the slots in the low-impedance section of the conventional SIR,the new resonator has a lower fundamental resonance f0 and can provide a potential finite transmission zero fz close to f0.Based on the proposed SSIR,a fourth-order Chebychev BandPass Filter (BPF) is designed at f0=1 GHz.The measured results show that a better than-65 dB rejection is achieved on both the lower and the upper stopband.Moreover,the new filter has a wide-30 dB rejection upper stopband from 1.13f0 to 6.52f0.The fabricated filter exhibits a size of The new filter has a planar topology and is easily integrated with modern portable communication systems.

关键词： BandPass Filter (BPF) Stepped-Impedance Resonator (SIR) High selectivity wide stopband

COMPACT BANDPASS FILTER WITH HIGH SELECTIVITY AND wide stopband USING SLOTTED STEPPED-IMPEDANCE RESONATOR

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Journal of Electronics(China) 2012年第Z1期 23-26页

作者： Xu Jin Ji Yuxue Miao Chen Wu Wen (Ministerial Key Laboratory of JGMT,Nanjing University of Science and Technology,Nanjing 210094,China)

关键词： BandPass Filter (BPF) Stepped-Impedance Resonator (SIR) High selectivity wide stopband

Novel Open-Loop Dumbbell-shaped Defected Ground Structure for wide stopband Implementation of Microstrip Lowpass Filter

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Novel Open-Loop Dumbbell-shaped Defected Ground Structure fo...

Improvement on Suppressing the Spurious Passband in Designing Cavity Filter

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作者： Sio-Weng Ting Kam-Weng Tam R.P.Martins Wireless Communication Laboratory University of Macau On leave from Instituto Superior Tecnico Technical University of Lisbon

＜正＞A novel open-loop dumbbell defected ground structure（DGS） unit is proposed.In contrast to a single rejection band characteristic offered by the conventional dumbbell DGS,the proposed DGS unit provides dual rejectionbands whose frequencies and bandwidth can be controlled by the DGS dimensions.A 2.4 GHz microstrip lowpass filter using 5 cascaded open-loop dumbbell units is designed.From the simulation and measured results,this new lowpass filter achieves a wide stopband with more than 24-dB attenuation upto 10 GHz.

关键词： Defected ground structure（DGS） open-loop dumbbell attenuation pole wide stopband

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Improvement on Suppressing the Spurious Passband in Designin...