Mechanism study of mechanical tuning in HTS filter application

Peng, Hao; Zhang, Xiaoping; Guo, Xubo; Mu, Lijuan; Wei, Bin; Gao, Bin; Cao, Bisong

doi:10.1002/mop.22561

Cited by 10 publications

(13 citation statements)

References 10 publications

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“…Dielectric rods can change the resonant frequency by changing the shunt capacitance to the ground [1]. To have a great influence on the resonant frequency, the rods are placed above the resonator where the electric field is concentrated.…”

Section: Tuning Of the Resonant Frequencymentioning

confidence: 99%

“…For wireless communication systems, HTS tuneable filters need wide-range tunability of the passband with remaining passband ripple. There are several reports on the center frequency tuneable HTS filters and trimming method for improving passband ripple of HTS filters [1]. H. Peng et al reported the trimming method which improves the passband ripple by adjusting the resonant frequency using dielectric and metallic screws [1].…”

Section: Introductionmentioning

confidence: 99%

“…There are several reports on the center frequency tuneable HTS filters and trimming method for improving passband ripple of HTS filters [1]. 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].…”

Section: Introductionmentioning

confidence: 99%

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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: Tuning Of the Resonant Frequencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Planar filters are more difficult to tune with tuning screws since the electric field tends to be trapped inside the dielectric. The use of tuning screws on planar filters is thus limited to fine tuning during production [17].…”

Section: Tunable Planar Filtersmentioning

confidence: 99%

Review on RF Tunable Filters

2017

IJIET

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-Multi-band radios are necessary nowadays to provide optimal data rates in a network with a varied and greasy landscape of coverage areas (3G, HSPA, LTE, etc.). As required the number of bands are increased, the total cost of discrete RF filters justifies the use of tunable RF filters. Tunable filters are one of the key to signal chain amalgamation. The main requirements for a tunable filter are high unloaded quality factor, wide tuning range, high tuning speed, high linearity, and small size. Tunable filters play a vital role in many RF receiver applications. These filters are used to separate or combine different frequencies bands because the electromagnetic spectrum is limited and has to be shared. Tunable RF filters are used to select or confine the RF signals within assigned spectral limits. Thanks to the numerous technology and the recent developments in design and implementations of the tunable RF filters, usage of these filters has increased exponentially. Emerging applications such as wireless communications continue to challenge RF/microwave filters with ever more stringent requirements higher performance, smaller size, lighter weight, and lower cost. Depending on the requirements and specifications, RF filters may be designed as lumped element or distributed element circuits. They may be realized in various transmission line structures, such as waveguide, coaxial line, and micro strip. Compared to the other types of filter, a tunable filter has its own place. There are many challenging research problems existing with tunable filters. Beginning with an overview of the tunable filters literature, this paper compares and discuss about the various tunable solutions and their issues with different types of tuning. High performance filters necessitate high resonator quality factors. Although filters are traditionally treated as passive devices, tunable filters need to be treated as active devices. Tuning elements invariably introduce non-linearities that limit the useful power handling of the tunable filter.

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“…To improve the HTS filter performance, many tuning methods have recently been developed . Researchers focus their attention on tuning center frequencies and fractional bandwidths of filters .…”

Section: Introductionmentioning

confidence: 99%

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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Mechanism study of mechanical tuning in HTS filter application

Cited by 10 publications

References 10 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

Review on RF Tunable Filters

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

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