High frequency coupling coefficient between the coplanar resonator and radio frequency SQUID

Author

Yi, H.R. ; Zhang, Y. ; Bousack, J.H. ; Braginski, A.I.

Author_Institution

Inst. fur Schicht- und Ionentech., Forschungszentrum Julich GmbH, Germany

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

4400

Lastpage

4403

Abstract

The coupling coefficient (k/sup 2/) between the superconducting coplanar resonator and the flip chip coupled washer radio frequency SQUID was calculated using computer simulation. The coplanar resonator is formed by two coplanar lines surrounding a flux concentrator with each line having a slit. For a 3 mm/spl times/3 mm washer SQUID with a 100 /spl mu/m/spl times/100 /spl mu/m loop coupled to a coplanar resonator with the slits on opposite sides, we estimated k/sup 2/=7.1/spl times/10/sup -3/. However, if the same SQUID is coupled to a coplanar resonator with parallel slits and with a short circuit at the 90/spl deg/ position with respect to the opening slit, k/sup 2/ of only 0.5/spl times/10/sup -3/ is obtained, which indicates that the k/sup 2/ is strongly dependent on the resonator layout. The simulation also shows that k/sup 2/ is dependent on the SQUID washer size and the separation distance between the washer SQUID and the coplanar resonator.

Keywords

SQUIDs; coplanar waveguide components; flip-chip devices; superconducting resonators; computer simulation; flip chip coupled washer radio frequency SQUID; high frequency coupling coefficient; superconducting coplanar resonator; Coupling circuits; Flip chip; Inductance; Noise measurement; Q factor; Radio frequency; Resonant frequency; SQUIDs; Superconducting device noise; Superconducting epitaxial layers;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.784000

Filename

784000