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Transmission Line M Derived Section

IP.com Disclosure Number: IPCOM000097214D
Original Publication Date: 1962-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Lentz, JJ: AUTHOR

Abstract

The upper drawings show a cryogenic transmission line and the equivalent circuit. The line has shield 11 and superconducting conductor 12. The latter has wide and narrow portions. Each narrow portion has L units of inductance. Each wide portion has C units of capacitance. The equivalent circuit neglects the capacitance of the narrow portions of the circuitry. It also neglects the inductance of the wide portions of the circuitry.

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Transmission Line M Derived Section

The upper drawings show a cryogenic transmission line and the equivalent circuit. The line has shield 11 and superconducting conductor 12. The latter has wide and narrow portions. Each narrow portion has L units of inductance. Each wide portion has C units of capacitance. The equivalent circuit neglects the capacitance of the narrow portions of the circuitry. It also neglects the inductance of the wide portions of the circuitry.

The lower drawings show the schematic circuit diagram of a circuit, termed an M derived section, and the corresponding cryogenic transmission line circuit. The transmission line is deposited over shield S. It has two overlapping tabs A and B connected by a narrow segment D and then a portion of transmission line similar to that in the upper drawing. There is capacitance between overlapping tabs A and B, shown in the equivalent circuit as C-AB. Section D has a certain amount of inductance, shown as L-AB. There is a certain amount of capacitance between the section B and the shield S. This is shown as C-BS. The inductance of sections E and G and the capacitance of section F are shown in the manner shown in the top drawing.

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