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

Volume

54

Issue

11

fYear

2006

Firstpage

3954

Lastpage

3959

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;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2006.885059

Filename

1717765