A Wideband HTS Filter Using Strong Coupling Coplanar Spiral Resonator Structure

Shang, Shuai; Wei, Bin; Cao, Bisong; Guo, Xubo; Wang, Xiang; Jiang, Linan

doi:10.1109/tasc.2018.2880331

Cited by 11 publications

(9 citation statements)

References 11 publications

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“…Comparing with normal conductors, hightemperature superconducting (HTS) materials can be used to realize low-loss performance. [7][8][9] In this letter, a simple triple-mode stub-loaded loop resonator (SLLR) is proposed and its equivalent circuit is set up. Then, the relationship between the resonant modes and the physical dimensions of the SLLR is studied to control the bandwidth of the proposed wideband BPF.…”

Section: Introductionmentioning

confidence: 99%

“…Microwave wideband bandpass filters (BPFs) with excellent performance, such as high selectivity, compact size, and low insertion loss are necessary for the wireless communication systems. Several forms of multi‐mode resonators have been introduced to design high‐performance wideband BPFs 1‐8 . In Reference 1, two pairs of transmission zeros (TZs) are achieved by introducing coupling between two pairs of short‐circuited stubs.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, their sizes are not compact and the insertion losses are not low enough. Comparing with normal conductors, high‐temperature superconducting (HTS) materials can be used to realize low‐loss performance 7‐9 …”

Section: Introductionmentioning

confidence: 99%

“…Several forms of multi-mode resonators have been introduced to design high-performance wideband BPFs. [1][2][3][4][5][6][7][8] In Reference 1, two pairs of transmission zeros (TZs) are achieved by introducing coupling between two pairs of shortcircuited stubs. In References 2 and 3, multiple transmission poles (TPs) and TZs are generated using simple coupled line structure to realize high-selectivity performance.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Compact high‐selectivity high‐temperature superconducting wideband bandpass filter using triple‐mode stub‐loaded loop resonator

Tian

Chen

Liu

et al. 2021

Int J RF Mic Comp-Aid Eng

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A triangle triple-mode stub-loaded loop resonator (SLLR) is proposed in this letter and used for wideband filter design. Also, this SLLR can produce multiple transmission zeros for high-selectivity bandpass filter (BPF) design without adding extra circuit unit. To verify the unique characteristics of the proposed SLLR, a compact wideband BPF is designed and fabricated using hightemperature superconducting YBCO thin films on a MgO substrate. Furthermore, a novel meander structure is introduced to realize compact size and strong input/output coupling design. The measured results show that the 3-dB fractional bandwidth is of 50.6% (2.55-4.28 GHz), and the selectivity factor of the passband is 0.87 with a maximum insertion loss of 0.07 dB, indicating good agreement with the theoretical expectation.

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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

Compact high‐selectivity high‐temperature superconducting wideband bandpass filter using triple‐mode stub‐loaded loop resonator

Tian

Chen

Liu

et al. 2021

Int J RF Mic Comp-Aid Eng

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“…Among them, resonators have better electromagnetic compatibility (EMC) and lower dispersion in band pass region. Furthermore, it is widely used in GPS, GSM and wireless application with easy shunt circuit realization, low radiation loss and insensitive to the substrate thickness (Shang et al, 2019;Fern andez-Prieto, 2016). The resonator is categorized into three major types as conventional resonator, conductor backed resonator and micro machined resonator (Xiao et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Compact multiple electromagnetic band gap (EBG) cells based ultra wide band (UWB) filter with improved stop-band characteristics

Hajamohideen¹,

Suseela²

2021

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Purpose The purpose of the study is – in Microwave filter design, the performances of passive components are deteriorated by parasitics at gigahertz (GHz) frequency range. A compact and multi-stack electromagnetic band gap (EBG) structure is proposed with improved stop band characteristics at GHz frequency range in this work. This paper proposes a new design for ultra wide band pass filter (resonator BPF) with periodically loaded one-dimensional EBG to achieve the harmonic suppression. This basic EBG structure is developed with combination of a signal strip and ground plane in the slotted section. The resonator BPF is loaded with one EBG, two EBG and three EBGs to improve the stop-band rejection. Design/methodology/approach The proposed filter is with multi-stack EBG cell for achieving good pass band and stop bands performance. Circuit model is analyzed in Section 2. Section 3 discuses band pass filter loaded with one EBG. In Sections 4 and 5, filter with two and three EBG loaded resonators are discussed, respectively. Section 6 is concluded with comparison of simulation and measured results. Findings The stop-band rejection is 20 dB, 40 dB and 50 dB, respectively, in the frequency range of 6 GHz to 20 GHz. The simulation analysis is carried out with advanced system design software. To validate the simulation results, proposed structure is fabricated, and results are found to be in good agreement. Originality/value This paper accounts for designing resonator BPF, which has slow wave pass band and stop band characteristics. Second and third harmonics are suppressed using multi-stack EBG. Various stacks with basic designs are proposed and improved results have been demonstrated which is open for future research.

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Wideband and wide stopband superconducting bandpass filter using asymmetric stepped‐impedance resonators connected to open stub

Luo

Wei

Wang

et al. 2020

Int J RF Microw Comput Aided Eng

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A wideband wide stopband filter is designed using asymmetric stepped‐impedance resonators (ASIRs) connected to a large open stub. The capacitive open stub and the parallel‐coupled microstrip line are used to achieve the strong couplings for large fractional bandwidth (FBW). For a wide‐stopband performance, the proposed filter uses ASIRs to improve the high‐order spurious resonant frequency. The first and last resonators of the proposed filter are further optimized to suppress the spurious resonant frequency caused by open stub. The final filter has a 70% FBW centered at 4.87 GHz with 20‐dB‐rejection stopband up to 15.78 GHz (approximately 3.24 f0). The measured insertion loss is less than 0.15 dB and the return loss is better than 17 dB.

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A Wideband HTS Filter Using Strong Coupling Coplanar Spiral Resonator Structure

Cited by 11 publications

References 11 publications

Compact high‐selectivity high‐temperature superconducting wideband bandpass filter using triple‐mode stub‐loaded loop resonator

Compact high‐selectivity high‐temperature superconducting wideband bandpass filter using triple‐mode stub‐loaded loop resonator

Compact multiple electromagnetic band gap (EBG) cells based ultra wide band (UWB) filter with improved stop-band characteristics

Wideband and wide stopband superconducting bandpass filter using asymmetric stepped‐impedance resonators connected to open stub

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