Title :
Varactor-Tuned Narrow-Band High Temperature Superconducting Notch Filter
Author :
Jia Wang ; Chunguang Li ; Xu Wang ; Na Li ; Yongbo Bian ; Guoqiang Li ; Yun Wu ; Fengjin Xia ; Dandan Bai ; Xueqiang Zhang ; Liang Sun ; Hong Li ; Yusheng He
Author_Institution :
Nat. Lab. for Supercond., Inst. of Phys., Beijing, China
Abstract :
A tunable narrow band high temperature superconducting (HTS) notch filter is presented. HTS folded square open loop resonator loaded with hyper-abrupt GaAs varactor is used to reach high tunability and avoid the via-hole grounding. Measured results show that the notch frequency can be tuned from 286 to 485 MHz (tuning range of 51.6%), and the attenuation from 26 to 70 dB when the bias voltage of the varactors is from 1 to 20 V. The -3 dB bandwidth is between 6.9 and 7.9 MHz, and the out-of-band insertion loss is less than 0.2 dB. Furthermore, the reliability of manufacture techniques of the filter is proved by mechanical vibration and shock tests.
Keywords :
III-V semiconductors; gallium arsenide; high-temperature superconductors; losses; microwave filters; narrow band gap semiconductors; notch filters; superconducting device reliability; superconducting filters; superconducting resonators; varactors; vibrations; GaAs; HTS folded square open loop resonator; bandwidth 6.9 MHz to 7.9 MHz; frequency 286 MHz to 485 MHz; hyper-abrupt GaAs varactor; manufacture techniques reliability; mechanical vibration; out-of-band insertion loss; shock tests; tunability; tunable narrow band high temperature superconducting notch filter; voltage 1 V to 20 V; Band-pass filters; Frequency measurement; High-temperature superconductors; Microwave filters; Resonator filters; Superconducting filters; Varactors; High temperature superconducting (HTS); narrowband; notch filter; tunable filter; varactor;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2014.2340577
