WO1994005022B1 - Superconducting control elements for rf antennas - Google Patents

Superconducting control elements for rf antennas

Info

Publication number
WO1994005022B1
WO1994005022B1 PCT/US1993/007701 US9307701W WO9405022B1 WO 1994005022 B1 WO1994005022 B1 WO 1994005022B1 US 9307701 W US9307701 W US 9307701W WO 9405022 B1 WO9405022 B1 WO 9405022B1
Authority
WO
WIPO (PCT)
Prior art keywords
superconducting
tines
capacitor
high temperature
substrate
Prior art date
Application number
PCT/US1993/007701
Other languages
French (fr)
Other versions
WO1994005022A1 (en
Filing date
Publication date
Priority claimed from US07/934,921 external-priority patent/US6335622B1/en
Application filed filed Critical
Publication of WO1994005022A1 publication Critical patent/WO1994005022A1/en
Publication of WO1994005022B1 publication Critical patent/WO1994005022B1/en

Links

Abstract

Control elements for RF antennas including high temperature superconducting capacitors (24) are formed. In one embodiment, a high temperature superconducting capacitor (24) is coupled to an inductor (22) to form a resonant circuit (20). In another embodiment a high temperature superconducting capacitor (32) is used to make a low-resistance cross-over (33) for an inductor (31). Additional circuits include circuits which do not use non-superconducting materials in the circuit, circuits which have coupled superconducting inductors (50, 51) for low-loss signal coupling, tuning and bandwidth broadening, and circuits which include switches to shut off the superconductivity of a superconductive element including low-loss photoconducting (70) and superconducting thermal (61) switches. These circuits are useful in Magnetic Resonance Imaging devices.

Claims

AMENDED CLAIMS
[received by the International Bureau on 2 February 1994 (02.02.94); original claims 3 and 4 cancelled; original claims 1 and 2 amended; new claims 25-31 added; remaining claims unchanged (2 pages)]
1. A high temperature superconducting capacitor comprising a first superconducting plate member and a second superconducting plate member, wherein the first superconducting plate member is hybridized to the second superconducting plate member and a dielectric is positioned between the first and second superconducting plate members.
2. A high temperature superconducting capacitor comprising a first superconducting plate member and a second superconducting plate member fabricated on a substrate and separated by a dielectric wherein the substrate comprises a dielectric and has a surface, the first superconducting plate member comprises a plurality of tines extending along the surface of the substrate, and the second superconducting plate member comprises a plurality of tines extending along the surface of the substrate and interspersed between the tines of the first plate member with substrate separating the tines of the first plate member and the tines of the second plate member.
5. A superconducting resonant circuit comprising an inductor and a high temperature superconducting capacitor.
6. A superconducting resonant circuit of claim 5 wherein the superconducting capacitor comprises 25. A high temperature superconducting capacitor comprising first and second superconducting plate members, and a dielectric having a first surface to which the first plate member is hybridized and having a second surface to which the second plate member is hybridized wherein the dielectric separates the first and second plate members.
26. A high temperature superconducting capacitor comprising a first superconducting member fabricated on a substrate, said first superconducting member having a plurality of tines extending along a surface of the substrate, a second superconducting member fabricated on the substrate, said second superconducting member having a plurality of tines extending along the surface of the substrate and interspersed between the tines of the first superconducting member with substrate separating the tines of the first superconducting member and the tines of the second superconducting member.
27. The high temperature superconducting capacitor of claim 26 wherein the substrate comprises a dielectric.
28. The high temperature superconducting capacitor of claim 26 wherein the surface of the substrate is planer.
29. The high temperature superconducting capacitor of claim 26 wherein the tines of the first and second superconducting members includes one or more tines having a length and a width wherein the length is at least about 250 times the width.
30. The high temperature superconducting capacitor of claim 29 wherein the length is at least about 800 times the width. 31. The high temperature superconducting capacitor of claim 29 wherein the length is at least about 1600 times the width. STATEMENTUNDERARTICLE 19
Claim 1 is amended, Claims 3 and 4 are cancelled, and Claims 25-31 have been added, to designate over the patents cited by the Examiner. Applicant hereby brings to the attention of the Examiner the enclosed U.S. Patent No. 5,231,078 to Riebman, e_t al. Although this patent may be pertinent to the art of the present invention, it does not disclose the invention as presently claimed.
The Examiner cites several patents as disclosing the superconductive capacitor plate structure of the present invention. However, neither Riebman nor any of the patents cited by the Examiner include superconducting plates, at least one of which is hybridized, as required in Claims 1 and 25.
In addition, none of the patents cited by the Examiner includes interspersed structures having superconducting tines which lie along the same surface as do the superconducting members, as required in Claims 2 and 26-31. Ruby, U.S. Pat. No. 5,061,686, is the only citation which was cited as a superconductive device having an interdigitated structure. However, Ruby does not show a structure as is presently claimed.
The Ruby device as shown in figures 4 and 5, has a trace structure 36 and 38 which includes interdigitated fingers 40 and 42, and has a capacitor member 26 which includes superconductive plates 54 and 56 separated by dielectric 52. However, as is shown in figure 5, the interdigitated fingers 40 and 42 are merely structural features to allow multiple connections to each plate 54 and 56 by means of vias 48 and 50. In addition, the interdigitated fingers 40 and 42 are separated from the plates 54 and 56 by a support member 24.
The invention of the present application is a significant improvement over the device of Ruby 5,061,686. Ruby does not disclose an interspersed structure which includes superconducting tines which lie along the same surface as do the superconducting members. In addition, neither Ruby nor any of the patents cited by the Examiner show a pair of interspersed tines having lengths at least about 250 times their widths as is required by Claims 29-31.
The invention of the present application is not suggested or shown in the patents cited by the Examiner or the patent cited by the applicant.
PCT/US1993/007701 1992-08-25 1993-08-16 Superconducting control elements for rf antennas WO1994005022A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/934,921 US6335622B1 (en) 1992-08-25 1992-08-25 Superconducting control elements for RF antennas
US07/934,921 1992-08-25

Publications (2)

Publication Number Publication Date
WO1994005022A1 WO1994005022A1 (en) 1994-03-03
WO1994005022B1 true WO1994005022B1 (en) 1994-03-31

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WO (1) WO1994005022A1 (en)

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