Superconducting tunable filter with constant bandwidth using coplanar waveguide resonators

doi:10.1088/1674-1056/26/10/108501

Abstract In this paper we propose a two-pole varactor-tuned superconducting filter using coplanar waveguide (CPW) spiral-in-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.

Keywords: coplanar waveguide (CPW) superconducting tunable filter varactor

Received: 17 May 2017
Revised: 19 June 2017
Accepted manuscript online:

PACS:

85.25.-j

(Superconducting devices)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61371009) and the National High Technology Research and Development Program of China (Grant No. 2014AA032703).

Corresponding Authors: Bin Wei
E-mail: weibin@mail.tsinghua.edu.cn

Cite this article:

Ying Jiang(蒋莹), Bo Li(李博), Bin Wei(魏斌), Xu-Bo Guo(郭旭波), Bi-Song Cao(曹必松), Li-Nan Jiang(姜立楠) Superconducting tunable filter with constant bandwidth using coplanar waveguide resonators 2017 Chin. Phys. B 26 108501

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Superconducting tunable filter with constant bandwidth using coplanar waveguide resonators

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