A High-Order L-Band HTS Filter for Sensitive Detecting

Wang, L. T.; Xiong, Yi; Xiao, Yan; Liu, J. Y.; He, Ming; Chen, H. H.; Lu, Jianghua; Zhao, Xinjie; Song, Fei

doi:10.1007/s10948-019-5070-z

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2020

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“…Half-wavelength resonator is widely used in HTS filter design. Numerous high order and excellent performance HTS filters are reported with half-wavelength resonators [3][4][5][6][7][8][9][10][11][12][13], but most of them are in the microwave range. It is difficult to realize higher order filter at VHF band for the large size of resonator.…”

Section: Introductionmentioning

confidence: 99%

A 12-pole VHF band high selective high temperature superconducting filter

Yu¹,

Wang²,

Wu³

et al. 2020

Supercond. Sci. Technol.

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A 12-pole VHF band high temperature superconducting (HTS) filter with a spiral quarter-wavelength resonator is introduced. The coupling characteristics of the proposed resonator, cross structure and external quality factor is analyzed in detail. The HTS filter is fabricated on a 3-inch-diameter double-sided DyBa2Cu3O7 HTS thin film with a LAO substrate and measured with a low-temperature test system at 77 K. The measured filter has a center frequency of 119.93 MHz and a 1-dB passband of 10.04 dB. Due to the introduction of transmission zeros, the rectangular coefficient (BW60dB/BW1dB) of the measured filter is about 1.20, which shows excellent selectivity. The measured results are in good agreement with the simulated ones.

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