An Ultra-Low Loss 2 B Reconfigurable Superconducting Filter at P-Band

Zhang, Ying; Wei, Bin; Cao, Bisong; Guo, Xubo; Zhang, Xiaoping; Zhang, Guoyong; Li, Qirong; Feng, Cheng

doi:10.1109/lmwc.2012.2235418

Cited by 7 publications

(13 citation statements)

References 14 publications

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“…Switchable filters have been widely researched and used in engineering applications owing to their flexibility, compact size and frequency switching property [1–6]. Many switches and components, including MEMS filters [1], varactors [2], bonding wire [3], tuning screws [4] and pin diodes [5, 6], are adopted to realise the frequency switching of filters in different bands. The MEMS filter is used to adjust the centre frequency of the filter and to ensure a large tuning range [1].…”

Section: Introductionmentioning

confidence: 99%

“…However, traditional switchable filters have the disadvantages of a low Q-value resonator and high insertion loss [5,6]. A 14.7% fractional bandwidth filter with pin diodes for 9-11 GHz has a 1.76 dB insertion loss [5], whereas the switchable bandpass filter with pin diodes for 0.3-0.6 GHz has a 1.32-1.95 dB insertion loss and an 11-19 equivalent Q-value [6].High-temperature superconducting (HTS) thin films, which have very low surface resistance, are used to fabricate high-performance filters with low insertion loss and extraordinarily steep skirts [1,3,4,7]. An HTS filter switching frequency by bonding wire has a high Q-value resonator in all four states [3], but it cannot be used for practical applications because of its long switching time.…”

mentioning

confidence: 99%

“…Many switches and components, including MEMS filters [1], varactors [2], bonding wire [3], tuning screws [4] and pin diodes [5,6], are adopted to realise the frequency switching of filters in different bands. The MEMS filter is used to adjust the centre frequency of the filter and to ensure a large tuning range [1].…”

mentioning

confidence: 99%

“…An HTS filter switching frequency by bonding wire has a high Q-value resonator in all four states [3], but it cannot be used for practical applications because of its long switching time. The high-speed mechanical tuning system with screws and step motors for HTS filters is complex and requires the installation of numerous peripheral components [4].…”

mentioning

confidence: 99%

“…Different loaded capacitors lead to different resonant frequencies. Assuming that the inductance of the resonator is constant, the tuning range of the resonator is [3] Df…”

mentioning

confidence: 99%

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UHF band switchable superconducting filter with pin diode switches

et al. 2014

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A low-loss switchable superconducting filter is presented. High Q resonators loaded with switchable superconducting interdigital capacitors are introduced. A two-pole 2-bit switchable high-temperature superconducting (HTS) filter at 516 MHz with a bandwidth of 29 MHz is designed and fabricated. The measured centre frequency tuning range is 33 MHz (6.4%). In all states, the HTS filter with pin diode switches exhibits an insertion loss <0.81 dB and a good return loss better than 16.8 dB.Introduction: Switchable filters have been widely researched and used in engineering applications owing to their flexibility, compact size and frequency switching property [1][2][3][4][5][6]. Many switches and components, including MEMS filters [1], varactors [2], bonding wire [3], tuning screws [4] and pin diodes [5,6], are adopted to realise the frequency switching of filters in different bands. The MEMS filter is used to adjust the centre frequency of the filter and to ensure a large tuning range [1]. The varactor is utilised to switch frequencies continuously [2]. Pin diodes have the advantages of small size and fast switching speed. However, traditional switchable filters have the disadvantages of a low Q-value resonator and high insertion loss [5,6]. A 14.7% fractional bandwidth filter with pin diodes for 9-11 GHz has a 1.76 dB insertion loss [5], whereas the switchable bandpass filter with pin diodes for 0.3-0.6 GHz has a 1.32-1.95 dB insertion loss and an 11-19 equivalent Q-value [6].High-temperature superconducting (HTS) thin films, which have very low surface resistance, are used to fabricate high-performance filters with low insertion loss and extraordinarily steep skirts [1,3,4,7]. An HTS filter switching frequency by bonding wire has a high Q-value resonator in all four states [3], but it cannot be used for practical applications because of its long switching time. The high-speed mechanical tuning system with screws and step motors for HTS filters is complex and requires the installation of numerous peripheral components [4].In this Letter, a new type of switchable HTS filter with pin diodes is proposed. The proposed filter combines the advantages of a high Q-value resonator and fast switching speed. The high Q-value resonator has a novel structure with interdigital capacitors (IDCs) at the two ends to connect switches, giving it the advantages of constant bandwidth and compact size. The frequency switching principle is discussed and analysed in detail in this Letter. The two-pole switchable HTS filter is fabricated on an MgO substrate with double-sided coated YBCO films. The measured results of the filter match well with the simulations.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

“…Different loaded capacitors lead to different resonant frequencies. Assuming that the inductance of the resonator is constant, the tuning range of the resonator is [3] Df…”

mentioning

confidence: 99%

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UHF band switchable superconducting filter with pin diode switches

et al. 2014

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A low loss superconducting filter with four states based on symmetrical interdigital-loaded structure

Gao

Wei

Cao

et al. 2016

Physica C: Superconductivity and its Applications

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Superconducting tunable filter with constant bandwidth using coplanar waveguide resonators

Jiang¹,

Li²,

Wei³

et al. 2017

Chinese Phys. B

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In this paper we propose a two-pole varactor-tuned superconducting filter using coplanar waveguide (CPW) spiralin-spiral-out (SISO) resonators. Novel internal and external coupling structures are introduced to meet the requirements for a tunable filter with a constant absolute bandwidth. The fabricated device has a frequency tuning range of 14.4% at frequencies ranging from 274.1 MHz to 317.7 MHz, a 3-dB bandwidth of 5.14 ± 0.06 MHz, and an insertion loss of 0.08 dB-0.70 dB. The simulated and measured results are in excellent agreement with each other.

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An Ultra-Low Loss 2 B Reconfigurable Superconducting Filter at P-Band

Cited by 7 publications

References 14 publications

UHF band switchable superconducting filter with pin diode switches

UHF band switchable superconducting filter with pin diode switches

A low loss superconducting filter with four states based on symmetrical interdigital-loaded structure

Superconducting tunable filter with constant bandwidth using coplanar waveguide resonators

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