Arrangement for coupling an rf-SQUID circuit to a super conducting tank circuit

• US 6,300,760 B1
• Filed: 05/26/1999
• Issued: 10/09/2001
• Est. Priority Date: 11/28/1996
• Status: Expired due to Fees

• Current Assignee: Forschungszentrum Jã¼Lich GmbH (Bundesrepublik Deutschland)
• Original Assignee: Forschungszentrum Jã¼Lich GmbH (Bundesrepublik Deutschland)
• Inventors: Zhang, Yi, Schubert, Jürgen, Yi, Huai-ren, Zeng, Xianghui, Zander, Willi, Banzet, Marko
• Primary Examiner(s): PATIDAR, JAY M
• Application Number:
  US09/308,883
• Time in Patent Office: 867 Days
• Field of Search: 324/244-248, 505/845, 505/846-874, 327/527, 327/528, 257/31
• US Class Current: 324/248
• CPC Class Codes: G01R 33/0358 coupling the flux to the SQUID gradiometer coils G01R33/022; coils with superconductive winding H01F6/06
• CPC Class Codes: Y10S 505/846 using superconductive quantum interference device, i.e. squid

Abstract

In an arrangement for coupling an rf-SQUID to a superconducting tank circuit and to a base plate, in which the tank circuit and the rf-SQUID form a coplanar structure and the tank circuit has a slit, the base plate (10) is configured as an outer loop (10a) coplanar to the rf-SQUID (2) and the tank circuit (1) and has a slit (11), and the tank circuit (1) comprises an inner loop (1a) in which the slit (4) is embodied, whereby the orientation of the slits (4, 11) of the inner loop (1a) and the outer loop (10a) relative to one another determines the resonance frequency f_r.

Claims

1. An arrangement for coupling an rf-SQUID to a superconducting tank circuit and to a base plate, in which the tank circuit and the rf-SQUID form a coplanar structure and the tank circuit has a slit, characterized in that the base plate is configured as an outer loop (10a) coplanar to the rf-SQUID (2) and to the tank circuit (1) and has a slit (11), and that the tank circuit (1) comprises an inner loop (1a) in which the slit (4) is embodied, and that the orientation of the slits (4, 11) of the inner loop (1a) and the outer loop (10a) relative to one another determines the resonance frequency f_r.

2. The arrangement according to claim 1, characterized in that an adjustment of the slits (4, 11) effects a change of the resonance frequency f_r of less than 300 MHz.

3. The arrangement according to claim 1, characterized in that a defined superconducting short-circuit (5) is built-in between the rf-SQUID (2) and the tank circuit (1).

4. The arrangement according to claim 3, characterized in that the defined superconducting short-circuit (5) is built-in between the inner loop (1a) and the outer loop (10a).

5. The arrangement according to claim 3, characterized in that the orientation of the short-circuit (5) relative to the slit (4) of the inner loop (1a) determines the resonance frequency f_r.

6. The arrangement according to claim 3, characterized in that the installation of the defined super-conducting short-circuit (5) effects a change of the resonance frequency f_r of less than 600 MHz.

7. The arrangement according to claim 1, characterized in that the rf-SQUID (2) has a SQUID with washer-SQUID structure.

8. The arrangement according to claim 1, characterized in that the rf-SQUID (2) has a SQUID with multiloop-SQUID structure.

9. The arrangement according to claim 1, characterized in that the rf-SQUID (2) has a SQUID with current injection-SQUID structure.

10. The arrangement according to claim 1, characterized in that the rf-SQUID (2) has a SQUID with single-layer or multilayered transformers with a plurality of windings.

11. The arrangement according to claim 1, characterized in that the rf-SQUID (2) has a SQUID with a double-coil gradiometer.

12. The arrangement according to claim 11, characterized in that the double-coil gradiometer is designed with two coils connected opposing in series.

13. The arrangement according to claim 1, characterized in that a flux transformer is formed within the tank circuit (1), said flux transformer having the coplanar outer loop (2), an insert loop (3.1) and a capacitor (7).

14. The arrangement according to claim 13, characterized in that provision is made for a second coupling coil (3.2) with a crossover (6), said coil being short-circuited.

15. The arrangement according to claim 14, characterized in that the short-circuit takes place in a position A of the capacitor (7) in order to decouple high-frequency current.

16. The arrangement according to claim 13, characterized in that a field direction of the insert loop (3.1) opposes the field direction of a second coupling coil (3.2).

17. The arrangement according to claim 1, characterized in that the tank circuit (1) has dimensions of less than 10×

10 mm².