Miniaturized HTS linear phase filter based on neighboring CQ units sharing resonators

Zhang, Tianliang; Yang, Kai; Zhu, Hai; Zhou, Liguo; Jiang, Mingxin; Dang, Wei; Ren, Xiangyang; Hou, Fangyan

doi:10.1088/0953-2048/28/10/105012

Cited by 11 publications

(15 citation statements)

References 20 publications

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“…Ref [1] Ref [3] Ref [5] Ref [8] Ref [12] Ref [14] Ref [15] This λgc is the guided-wavelength at the center frequency f 0 .…”

Section: Filtermentioning

confidence: 99%

“…With both the maturity of the preparation technology of HTS film and improvement of refrigeration level, the application of HTS receiver front-end in mobile communication base stations is becoming prevalent [1][2][3][4][5][6][7][8][9]. Effective improvement of the out-of-band suppression in the bandpass filters can be achieved by introducing transmission zeros (TZs) on the imaginary axis on complex plane and notches [1][2][3][4][5][10][11][12][13][14][15]. Cross coupling is one of the most widely-used methods to introduce TZs in HTS filters.…”

Section: Introductionmentioning

confidence: 99%

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Design of special asymmetric cul-de-sac unit configuration high temperature superconductor filter with multi-pair of transmission zeros

Zhou¹,

Long²,

Wu³

et al. 2020

Supercond. Sci. Technol.

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A high-temperature superconductor (HTS) bandpass filter with special asymmetric cul-de-sac units (SACUs) is introduced and a compact low-radiating microstrip resonator is suggested for the filter realization. Such a filter is capable of providing better selectivity and higher out-of-band rejection and hence a decrease in adjacent-channel interference, which is of critical importance for mobile communication. This improvement of the filter characteristics results from an increase in the number of pairs of transmission zeros (TZs) on the imaginary axis on the complex plane when using the filter composed of the introduced SACUs, each providing a pair of TZs. An 11-pole filter consisting of two SACUs was fabricated using MgO substrate of 0.5 mm thickness with double-sided YBCO HTS film. Characterization of the filter at 77 K gave a central frequency of 2345 MHz, insertion loss 0.19 dB, an overall in-band return loss better than 15 dB, and an ultra-high band-edge steepness as a consequence of the two pairs of TZs. The measured characteristics are in good accord with those obtained by electromagnetic simulation.

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“…Ref [1] Ref [3] Ref [5] Ref [8] Ref [12] Ref [14] Ref [15] This λgc is the guided-wavelength at the center frequency f 0 .…”

Section: Filtermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of special asymmetric cul-de-sac unit configuration high temperature superconductor filter with multi-pair of transmission zeros

Zhou¹,

Long²,

Wu³

et al. 2020

Supercond. Sci. Technol.

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“…High-temperature superconductor HTS YBa 2 Cu 3 O 7−δ (YBCO) is characterized by several unique properties to be used as a microwave filter material, such as lower RF losses than conventional conductors [5][6][7]; many bandpass filters are designed using HTS YBCO thin films with several types of lumped elements, such as four-pole cross-coupled [8], compact eight-pole [9] and parallelconnected network [10]. However, most of the reported bandpass filters employed large area (∼ 225-5900 mm 2 ).…”

Section: Introductionmentioning

confidence: 99%

A High Return Loss of Microwave Bandpass Filter Using Superconducting Electrospun Ybco Nanostructures

Jasim

Jusoh

You³

et al. 2018

PIER C

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Abstract-A high return loss (−30 dB), small size (100 mm 2 ) and broad bandwidth (1.5 GHz) microwave bandpass filter has been designed using finite element modelling and practically realized using superconducting YBa 2 Cu 3 O 7−δ (YBCO) thin films deposited on a (10 × 10 mm 2 ) LaAlO 3 substrate by spin coating. Superconducting YBCO material was prepared by electrospinning technique and solidstate reaction. The microwave properties of filter circuits were experimentally determined using the vector network analyser (VNA) at room temperature (300 K) and in the presence of liquid nitrogen (77 K). The solid-state filter showed high return loss (i.e., −22 dB) at operating frequency of 9.7 GHz and broad bandwidth of 1.5 GHz, which is consistent with the simulation results. The insertion losses for YBCO filters are ∼ −2, ∼ −1.5 and ∼ −3 dB for the normal, nanoparticle and nanorod respectively. However, the electrospun filters exhibited lower performance due to the nano-structural properties of YBCO samples at nanoscale which make these samples have a large band gap compared to solid-state sample. The results indicate that the filter design and simulation result are reliable. Hence, HTS YBCO could be a potential microwave bandpass filter in industry.

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“…Filters with advantages such as low insertion loss, a high-quality factor and excellent out-ofband rejection are widely researched by scholars [1][2][3][4][5][6][7][8][9][10]. In order to obtain a better selectivity within a limited area of high-temperature superconducting (HTS) thin films, introducing cross coupling between non-adjacent resonators [11][12][13][14][15][16][17], adopting parallel topology [18][19][20] and extracted-pole technology [18][19][20][21][22][23][24] to realize the quasi-elliptic function [13][14][15][16][17][25][26][27][28][29][30][31][32][33][34][35][36][37] and generalized Chebyshev function [38][39][40]…”

Section: Introductionmentioning

confidence: 99%

Novel configuration of a HTS filter with adjustable transmission zeros based on a modified cascaded quartet structure

Zhou¹,

Li²,

Long³

et al. 2018

Supercond. Sci. Technol.

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A novel configuration for adjusting the relative position of transmission zeros (TZs) based on the cascaded quartet (CQ) structure filter is proposed. By simply introducing joint cross coupling (JCC) between two adjacent CQ units of the filter and changing its coupling strength, the relative position of TZs produced by the conventional CQ units can be altered easily so as to achieve better selectivity and out-of-band rejection. The filter with the proposed configuration is named a quasi-CQ (QCQ) configuration filter in this paper. The symmetrical QCQ configuration filter can obtain the frequency response of the asymmetrical filter, so the design difficulty of filters with multiple pairs of separated TZs is greatly reduced. A series of prototypes of QCQ configuration filters is given and analyzed to provide design guidance for designers in the future. Finally, the correctness and feasibility of the proposed approach are verified by fabricating and measuring a symmetrical high-temperature superconducting QCQ configuration filter, and the test results accord well with the simulated ones.

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Miniaturized HTS linear phase filter based on neighboring CQ units sharing resonators

Cited by 11 publications

References 20 publications

Design of special asymmetric cul-de-sac unit configuration high temperature superconductor filter with multi-pair of transmission zeros

Design of special asymmetric cul-de-sac unit configuration high temperature superconductor filter with multi-pair of transmission zeros

A High Return Loss of Microwave Bandpass Filter Using Superconducting Electrospun Ybco Nanostructures

Novel configuration of a HTS filter with adjustable transmission zeros based on a modified cascaded quartet structure

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