Development of High-Speed Mechanical Tuning System for HTS Filters

Ohshima, Shigetoshi; Ohsaka, M.; Lee, Jae-Hun; Takeuchi, S.; Kinouchi, H.; Ono, Satoshi; Takano, Y.; Nakamura, Takashi; Yokoo, Masakazu; Takeuchi, Takayuki; Saito, Atsushi

doi:10.1109/tasc.2009.2018092

Cited by 9 publications

(12 citation statements)

References 22 publications

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“…H. Peng et al reported the trimming method which improves the passband ripple by adjusting the resonant frequency using dielectric and metallic screws [1]. In addition, Ohshima et al had developed a high-speed tuning system for HTS microstrip line filters using a dielectric plate for tuning the center frequency, dielectric rods for trimming the passband ripple, and conducting rods for improving the bandwidth [3]. However, the tuning system have to change three parameters such as distance between filter and the dielectric plate, the dielectric rods and the conducting rods for tuning and trimming.…”

Section: Introductionmentioning

confidence: 99%

HTS Filter with Dielectric Rods for Tuning the Center Frequency and Trimming the Passband ripple

Unno

Sekiya

2018

J. Phys.: Conf. Ser.

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Section: Introductionmentioning

confidence: 99%

HTS Filter with Dielectric Rods for Tuning the Center Frequency and Trimming the Passband ripple

Unno

Sekiya

2018

J. Phys.: Conf. Ser.

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“…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.…”

mentioning

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%

“…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%

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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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A mechanical tuning method for superconducting filter in both frequency domain and time domain

Song

Wei

Cao

et al. 2013

Micro & Optical Tech Letters

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This article presents a mechanical tuning method for high-temperature superconducting (HTS) filter based on the frequency domain and the time domain using dielectric tuning rods and metallic tuning rods. The resonant frequency tuning effect with dielectric and metallic rods was analyzed using lumped-element models. The simulation results showed that the resonant frequency of each resonator can be tuned separately. An eight-pole HTS twin spiral filter was tuned with the proposed method in frequency domain and time domain simultaneously, as a demonstration. After tuning, the filter has a 16.82 dB return loss, a 0.26 dB insertion loss and a 0.14 dB in-band ripple. High-temperature superconducting (HTS) microwave filters with sharp skirt rejection, low insertion loss, and high selectivity are well developed for wireless communication systems [1][2][3][4]. However, the measured performance of HTS filters may deteriorate because of manufacturing errors and nonuniformity of material characteristics.To improve the HTS filter performance, many tuning methods have recently been developed [5][6][7][8][9][10][11]. Researchers focus their attention on tuning center frequencies and fractional bandwidths of filters [5,6]. Several approaches have been proposed on improving the in-band performance of HTS filters [7][8][9][10][11]. Mechanical tuning methods using trimming rods and plates have

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Development of High-Speed Mechanical Tuning System for HTS Filters

Cited by 9 publications

References 22 publications

HTS Filter with Dielectric Rods for Tuning the Center Frequency and Trimming the Passband ripple

HTS Filter with Dielectric Rods for Tuning the Center Frequency and Trimming the Passband ripple

UHF band switchable superconducting filter with pin diode switches

A mechanical tuning method for superconducting filter in both frequency domain and time domain

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