An Ultranarrowband High-Temperature Superconducting Bandpass Filter With a Fractional Bandwidth of 0.02%

Li, Chunguang; Yu, Tao; Bian, Yongbo; Wu, Yun; Wang, Jia; Zhang, Xueqiang; Sun, Lingling; Lei, Hong; He, Yusheng

doi:10.1109/tasc.2016.2601650

Cited by 14 publications

(5 citation statements)

References 5 publications

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“…The filter was designed using hairpin microstrip resonators with 1.5 times wavelength and shows an insertion loss of 2.04 dB. Recently, Li et al [9] developed an ultra-narrow band-pass HTS filter with an FBW of 0.02% in C band. Novel approaches to solve the weak coupling and unwanted parasitic coupling problems have been introduced.…”

Section: Fractional Band Widthmentioning

confidence: 99%

Progress on applications of high temperature superconducting microwave filters

Li¹,

Xu²,

Wang³

et al. 2017

Supercond. Sci. Technol.

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In the past two decades, various kinds of high performance high temperature superconducting (HTS) filters have been constructed and the HTS filters and their front-end subsystems have been successfully applied in many fields. The HTS filters with small insertion loss, narrow bandwidth, flat in-band group delay, deep out-of-band rejection, and steep skirt slope are reviewed. Novel HTS filter design technologies, including those in high power handling filters, multiband filters and frequency tunable filters, are reviewed, as well as the all-HTS integrated front-end receivers. The successful applications to various civilian fields, such as mobile communication, radar, deep space detection, and satellite technology, are also reviewed.

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Section: Fractional Band Widthmentioning

confidence: 99%

Progress on applications of high temperature superconducting microwave filters

Li¹,

Xu²,

Wang³

et al. 2017

Supercond. Sci. Technol.

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show abstract

“…On the other hand, most filters with large slope steepness achieve a small tuning range [24,31]. Filters having a wide tuning range together with high slope steepness are commonly electrically large [19,32,33]. An effective method for improving slope steepness and stopband attenuation in the case of filter sections having small sizes and simple designs is cascading of several sections [32,[34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

A Tunable Microstrip Bandpass Filter with Two Concurrently Tuned Transmission Zeros

et al. 2022

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In this paper, an electrically small tunable microstrip bandpass filter with two concurrently tuned transmission zeros (TZs) is presented. The filter consists of two coupled resonators and varactors as tuning elements. An application of a multipath coupling network results in TZs on both sides of the passband. The filter controlled by a single voltage has a wide tuning range from 370 MHz to 800 MHz and a low insertion loss ranging from 1.9 dB to 3.4 dB. To achieve high attenuation in the stopband, two sections of the designed filter were cascaded. Both one-section and two-section filters were validated by measurements. The obtained results are in a very good agreement with simulations.

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“…Li and Huang et al [2] proposed a multiloop resonator to design a quasi-elliptic filter with an FBW of 0.23%. Li et al [3,4] presented a clip-shape resonator and a dual-spiral resonator to design quasi-elliptic function ultra-narrowband HTS filters with FBWs of 0.02% and 0.35%. Huang et al [5] designed a resonator consisting of a microstrip spiral, with a reversal in winding direction and developed a 0.1% bandwidth filter.…”

Section: Introductionmentioning

confidence: 99%

Compact ultra-narrowband superconducting filter using N-spiral resonator with open-loop secondary coupling structure*

Lin¹,

Wei²,

Guo³

et al. 2020

Chinese Phys. B

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A novel N-spiral resonator with open-loop secondary coupling structure (OLSCS) is proposed to realize a compact ultra-narrowband high temperature superconducting (HTS) filter. The coupling strength and polarity between the resonators can be significantly reduced and changed by introducing OLSCS, thus the required weak coupling can be achieved in a very compact size. A six-pole superconducting filter at 1701 MHz with a fractional bandwidth of 0.19% is designed to validate this method. The filter is fabricated on MgO substrate with a compact size of 15 mm × 10 mm. The measured insertion loss is 0.79 dB, and the return loss is better than 17.4 dB. The experimental results show a good agreement with the simulations.

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An Ultranarrowband High-Temperature Superconducting Bandpass Filter With a Fractional Bandwidth of 0.02%

Cited by 14 publications

References 5 publications

Progress on applications of high temperature superconducting microwave filters

Progress on applications of high temperature superconducting microwave filters

A Tunable Microstrip Bandpass Filter with Two Concurrently Tuned Transmission Zeros

Compact ultra-narrowband superconducting filter using N-spiral resonator with open-loop secondary coupling structure*

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