Superconducting tunable filter with constant bandwidth using coplanar waveguide resonators  

作　　者：蒋莹 李博 魏斌 郭旭波 曹必松 姜立楠 

机构地区：[1]State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University [2]Department of Electronic Engineering Tsinghua University

出　　处：《Chinese Physics B》2017年第10期472-476,共5页中国物理B（英文版）

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

摘　　要：In this paper we propose a two-pole varactor-tuned superconducting filter using coplanar waveguide （CPW） spiralin-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.In this paper we propose a two-pole varactor-tuned superconducting filter using coplanar waveguide （CPW） spiralin-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.

关 键 词：coplanar waveguide （CPW） SUPERCONDUCTING tunable filter VARACTOR 

分 类 号：TN713[电子电信—电路与系统] TN814