Design of High-Temperature Superconducting Dual-Band Filter With Multiple Transmission Zeros

Zhou, Liguo; Li, Hui; Long, Zhihe; Cao, Shuangshuang; Jiang, Mingxin; Zhang, Tianliang

doi:10.1109/tasc.2019.2891161

Cited by 8 publications

(8 citation statements)

References 45 publications

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“…Abbreviations: ABW, absolute bandwidth; BPF, balanced bandpass filter; FTR, frequency‐tuning range; ROR, roll‐off ratio 25 ; TZ, transmission zero.…”

Section: Filter Fabrication and Measurementmentioning

confidence: 99%

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Tunable balanced bandpass filter with wide frequency‐tuning range and high selectivity

Yang

Zhang

Wang

et al. 2022

Micro & Optical Tech Letters

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A tunable balanced bandpass filter (BPF) with a wide frequency-tuning range (FTR) and high selectivity is presented. The designed BPF is implemented by utilizing varactor-tuned square ring resonators (SRRs) with parallel-coupled feedlines. A wide FTR with an almost constant absolute bandwidth (CABW) can be realized by varactors C v2 connected between SRRs. Four transmission zeros (TZs) can be obtained by the mixed electric and magnetic coupling, source-load (S-L) frequency-variant coupling, and four shunt quarterwavelength open and short stubs. Meanwhile, two TZs on both sides of the passband keep the relative position unchanged to achieve high selectivity. The other two are generated to improve the out-band rejection. In addition, by employing additional stubs and capacitances on the symmetry plane, the common-mode (CM) suppression can be enhanced. For verification, a tunable balanced BPF with 0.62-1.27 GHz and four TZs was designed, manufactured, and tested. And experimental results agree well with the simulated ones. K E Y W O R D Sbalanced bandpass filter (BPF), constant absolute bandwidth (CABW), high selectivity, tunable, wide frequency-tuning range (FTR)

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“…Abbreviations: ABW, absolute bandwidth; BPF, balanced bandpass filter; FTR, frequency‐tuning range; ROR, roll‐off ratio 25 ; TZ, transmission zero.…”

Section: Filter Fabrication and Measurementmentioning

confidence: 99%

“…Therefore, it possesses great potential in tunable and multi-purpose RF/Microwave systems. Comparisons with reported tunable balanced microstrip BPFs : ABW, absolute bandwidth; BPF, balanced bandpass filter; FTR, frequency-tuning range; ROR, roll-off ratio25 ; TZ, transmission zero.…”

mentioning

confidence: 99%

Tunable balanced bandpass filter with wide frequency‐tuning range and high selectivity

Yang

Zhang

Wang

et al. 2022

Micro & Optical Tech Letters

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“…These requirements can be met by using high-pole BPFs with a hightemperature superconductor (HTS), which has very low conductor loss. Many design methods for HTS dual-band bandpass filters (DB-BPFs) and tri-band BPFs have been reported [2][3][4][5][6][7][8]. However, there have been few reports of an HTS quadband bandpass filter (QB-BPF).…”

Section: Introductionmentioning

confidence: 99%

Development of highly selective compact high-temperature superconducting quad-band bandpass filter using interdigital feeding structure for radio astronomy

Rachi¹,

Sakuma²,

Akahori³

et al. 2022

Supercond. Sci. Technol.

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Astronomers at the Mizusawa Very Long Baseline Interferometry Observatory of the National Astronomical Observatory of Japan are promoting the development of broadband receivers in the ultra-high frequency (UHF) band. The presence of extensive radio frequency interferences (RFI) in the UHF band hinders continuous broadband radio observations in this band. A promising technical solution to this problem is to use a superconducting multi-band bandpass filter as it enables the bundling of several RFI-free bands. We have developed a high-temperature superconducting compact quad-band bandpass filter (QB-BPF) at 0.7, 1.4, 1.6, and 2.1 GHz with low loss and steep cutoff characteristics for broadband receivers. That consists of two six-pole dual-band bandpass filters. We have devised an interdigital feeding structure with a high degree of freedom that enables the external quality factor to be designed individually for each band. A compact QB-BPF was fabricated using double-sided YBa2Cu3Oy thin films on a 36.4 mm × 42.0 mm (0.22λg × 0.25λg) Al2O3 substrate. The measurement results agreed well with the simulated ones, indicating that the QB-BPF overcomes the problem of extensive RFI in the UHF band.

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“…The primary design strategy is to employ multiple resonators or a multi‐mode resonator 5‐10 for the multi‐band BPF realizations. But different techniques are utilized such as stub loaded resonator methods, 5,6 substrate integrated waveguides, 7,8 high‐temperature superconducting 9,10 and transversal signal interaction techniques 11 . In References 6 and 9, the researchers employed one‐wavelength ring resonators with stepped impedance structures or loading stubs to obtain dual‐band filtering response.…”

Section: Introductionmentioning

confidence: 99%

“…In References 6 and 9, the researchers employed one‐wavelength ring resonators with stepped impedance structures or loading stubs to obtain dual‐band filtering response. In References 7 and 10, half‐wavelength stub‐loaded open‐loop resonators or slotlines were proposed to achieve different types of dual‐band BPFs. However, the designed prototypes of these filters are relatively complicated.…”

Section: Introductionmentioning

confidence: 99%

Dual‐band bandpass filter using two simple coupled microstrip rings

Zhang

Chen

2020

Engineering Reports

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A new dual‐band bandpass filter (BPF) using two very simple coupled microstrip rings is proposed in this paper. The two identical 3λg/2 microstrip rings are coupled each other with λg/2 coupled length, resulting in the generation of dual frequency bands with multiple transmission zeros (TZs). Theoretical deduction is presented to verify the proposed structure. The center frequencies and bandwidths of the two passbands can be tuned by controlling the impedance parameters of the microstrip rings. For demonstration, a prototype example of this dual‐band BPF is fabricated and characterized. The measured results show that it has high selectivity and great return losses of passbands with multiple TZs at the stopband.

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Design of High-Temperature Superconducting Dual-Band Filter With Multiple Transmission Zeros

Cited by 8 publications

References 45 publications

Tunable balanced bandpass filter with wide frequency‐tuning range and high selectivity

Tunable balanced bandpass filter with wide frequency‐tuning range and high selectivity

Development of highly selective compact high-temperature superconducting quad-band bandpass filter using interdigital feeding structure for radio astronomy

Dual‐band bandpass filter using two simple coupled microstrip rings

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