Superconducting stripline resonator performance

Author

McAvoy, B.R. ; Wagner, G.R. ; Adam, J.D. ; Talvacchio, J. ; Driscoll, M.

Author_Institution

Westinghouse Res. & Dev. Center, Pittsburgh, PA, USA

Volume

25

Issue

2

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

1104

Lastpage

1106

Abstract

Reliable techniques for evaluating the microwave properties of superconductors are essential in providing calibrated data for exchange between laboratories and for developing practical device designs. The authors are examining the techniques which utilize microwave stripline resonators. These resonators provide for the rapid measurement of microwave parameters in a repeatable fashion with minimal constraints on processing. Sandwiched microstrip line resonators are used to compare the performance at 4.2 K of OFHC copper and superconducting films of Pb, Nb, and YBa₂Cu₃O₇ (YBCO) at C-band and X-band. Typical results for the Nb resonators show a loaded Q_L of about 8×10⁴ with a transmission insertion loss of 5 dB at 3 GHz. Initial results on a YBCO a-axis film used as a ground plane in the Nb resonator yield a surface resistance value of about 10 ^-3 Ω at 2.8 GHz. Preliminary results on the phase noise performance of a Nb resonator at 2.9 GHz are presented

Keywords

Q-factor; barium compounds; electron device noise; high-temperature superconductors; lead; losses; niobium; resonators; solid-state microwave devices; strip line components; superconducting devices; superconducting thin films; type I superconductors; type II superconductors; yttrium compounds; 10^-3 ohm; 2.8 to 3 GHz; 4.2 K; 5 dB; C-band; Cu; Nb; OFHC Cu; Pb; X-band; YBa₂Cu₃O₇; a-axis film; high temperature superconductors; loaded Q-factor; microwave properties; phase noise performance; stripline resonator; surface resistance; transmission insertion loss; Microstrip resonators; Microwave measurements; Microwave theory and techniques; Niobium; Stripline; Superconducting devices; Superconducting films; Superconducting microwave devices; Surface resistance; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92482

Filename

92482