HTS narrow band filters at UHF band for radio astronomy applications

Author

Zhou, Jiafeng ; Lancaster, Michael J. ; Huang, Frederick ; Roddis, Neil ; Glynn, Dave

Author_Institution

Dept. of Electron., Univ. of Birmingham, UK

Volume

15

Issue

2

fYear

2005

fDate

6/1/2005 12:00:00 AM

Firstpage

1004

Lastpage

1007

Abstract

High performance narrow-band High-Temperature Superconductor (HTS) filters at 610 MHz with very sharp cut-off response and low loss are needed for improving the observation of pulsars at the Jodrell Bank Observatory, UK. An eight-pole quasi-elliptic HTS filter using compact resonators has been designed for this purpose. The measured response of filter has an insertion loss of 0.3 dB (including a 0.2 dB ripple), and a return loss of 15 dB in the passband. Two transmission zeroes are realized to improve the steepness of the cut-off. The lowest harmonic is designed to appear at 1.79 GHz, about three times the center frequency. The out-of-band rejection is better than 85 dB up to this harmonic. The filter has been tested in the observatory with excellent results.

Keywords

UHF filters; band-pass filters; high-temperature superconductors; radioastronomy; superconducting filters; 0.3 dB; 1.7 GHz; 15 dB; 610 MHz; Jodrell Bank Observatory; UHF band; compact resonators; filter response; high-temperature superconductor filters; microwave filters; narrow band filters; passband filter; radio astronomy; superconducting filters; transmission zeroes; Band pass filters; Extraterrestrial measurements; High temperature superconductors; Narrowband; Observatories; Performance loss; Power harmonic filters; Radio astronomy; Resonator filters; Superconducting filters; Astronomy; high-temperature superconductors; microwave filters; superconducting filters;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2005.850170

Filename

1439810