Title :
A Narrowband Superconducting Filter Using Spirals With a Reversal in Winding Direction
Author :
Huang, Frederick ; Zhou, Ming ; Yue, Libin
Author_Institution :
Dept. of Electron., Electr., & Comput. Eng., Univ. of Birmingham
Abstract :
A resonator consisting of a microstrip spiral, with a reversal in winding direction, is used for a narrowband superconducting filter. The fields are tightly confined, leading to the required small coupling coefficients, without a large separation between resonators. Nevertheless, tunability and power-handling capacity are better than some other resonators with localized fields. A quality factor exceeding a million was achieved. A 148 MHz, 0.1% bandwidth sixth-order quasi-elliptic filter is demonstrated
Keywords :
Q-factor; VHF filters; elliptic filters; microstrip resonators; superconducting coils; superconducting filters; 148 MHz; coupling coefficients; microstrip spiral; narrowband superconducting filter; quality factor; sixth-order quasielliptic filter; winding direction reversal; Bandwidth; Energy storage; Frequency; Magnetic fields; Microstrip filters; Microstrip resonators; Narrowband; Resonator filters; Spirals; Superconducting filters; Filters; narrowband; spiral; superconducting;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2006.885059
