Tuning superconducting microwave filters by laser trimming

Author

Parker, N.J. ; Goodyear, S.W. ; Ellis, D.J.P. ; Humphreys, R.G.

Author_Institution

QinetiQ, Malvern, UK

Volume

3

fYear

2002

fDate

2-7 June 2002

Firstpage

1971

Abstract

At present, superconducting filters are usually tuned using screws, but there are many reasons to seek an alternative. Laser trimming is an attractive choice. A laser trimming system is described that can tune a high temperature superconductor microstrip filter while it is cooled and connected to a network analyser. Software has been written to control the system, fit measured data and modify a filter design to account for unintended couplings. The residual material left after trimming YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// has been shown to have negligible microwave loss. The system has been used to tune a simple three-resonator filter.

Keywords

barium compounds; circuit tuning; high-temperature superconductors; laser ablation; laser beam machining; microstrip filters; microwave filters; passive filters; resonator filters; superconducting filters; superconducting microwave devices; superconducting resonators; superconducting thin films; yttrium compounds; HTS microwave filters; YBCO HTSC filters; YBa/sub 2/Cu/sub 3/O/sub 7/; YBaCuO superconductor; filter tuning; high temperature superconductors; laser trimming system; superconducting microwave filters; three-resonator filter; Control systems; Fasteners; High temperature superconductors; Laser tuning; Masers; Microstrip filters; Microwave filters; Software measurement; Superconducting filters; Superconducting microwave devices;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2002 IEEE MTT-S International

Conference_Location

Seattle, WA, USA

ISSN

0149-645X

Print_ISBN

0-7803-7239-5

Type

conf

DOI

10.1109/MWSYM.2002.1012252

Filename

1012252