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Laminar Superconducting Delay Line

IP.com Disclosure Number: IPCOM000097149D
Original Publication Date: 1962-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Connell, RA: AUTHOR

Abstract

Laminar thin film conductors of superconducting and resistive metals are used to provide a strip transmission line which exhibits a relatively slow velocity of propagation. The thickness of the individual metals in each of the conductors is so chosen that the composite conductor is completely superconducting.

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Laminar Superconducting Delay Line

Laminar thin film conductors of superconducting and resistive metals are used to provide a strip transmission line which exhibits a relatively slow velocity of propagation. The thickness of the individual metals in each of the conductors is so chosen that the composite conductor is completely superconducting.

The superconducting phase in a laminar superconducting-resistive conductor extends beyond the superconducting metal into the resistive metal a finite distance. Provided only that the thickness of the normal metal is less than this finite distance, the entire conductor is superconducting while exhibiting several unique characteristics. One of these is the larger value of inductance obtained in the laminar conductor over that obtained in a single layer of superconductor. Qualitatively, this results from an increase in the effective magnetic field penetration depth.

This transmission line, in which the velocity of propagation v is equal to (LC)/- 1/2/, includes a conductor 1 consisting of a superconducting metal layer 2 and a normal metal layer 3 separated by an insulator layer 4 from a ground plane 5. The latter also consists of a superconducting metal layer 6 and a normal metal layer 7. Typically, the thickness of layers 2 and 6is each in excess of 1000 Angstrom units so that the critical temperature of conductors 1 and 5 is approximately the same as that of layers 2 and 6. The thickness of layers 3 and 7 is the maximum comp...