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Electronically Variable Superconducting Stripline

IP.com Disclosure Number: IPCOM000042186D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Faris, SM: AUTHOR

Abstract

Superconducting striplines are electronically variable in characteristic impedance as a function of heavy injection of excess quasi-particles, which modifies the energy gap of the superconductive ground plane of the stripline. Modulating superconductive striplines by controlled heavy injection of quasi-particles provides a number of practical applications useful in electronic apparatus. Planar transmission lines may be modulated according to known modulation techniques including phase velocity, inductance and impedance. Energy gap modulation is achieved by heavy injection of excess energetic quasi-particles, for example, by photon injection through optical irradiation.

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Electronically Variable Superconducting Stripline

Superconducting striplines are electronically variable in characteristic impedance as a function of heavy injection of excess quasi-particles, which modifies the energy gap of the superconductive ground plane of the stripline. Modulating superconductive striplines by controlled heavy injection of quasi- particles provides a number of practical applications useful in electronic apparatus. Planar transmission lines may be modulated according to known modulation techniques including phase velocity, inductance and impedance. Energy gap modulation is achieved by heavy injection of excess energetic quasi- particles, for example, by photon injection through optical irradiation. A transmission line may, for example, be designed to behave as an electromagnetic cavity resonating at multiples of the fundamental frequency: f=1/2t where t=!LC, the signal propagation delay. Fig. 1 is a semidiagrammatic presentation. Superconducting stripline 1 is arranged adjacent to superconducting groundplane 2, which in turn is adjacent to quasi-particle injector 3. Heavy injection of excess quasi-particles into groundplane 2 alters the inductance of superconducting stripline 1; the superconducting stripline so controlled, may be designated by a symbol 1' in Fig. 1. Fig. 2 illustrates a modulator embodiment. Superconducting stripline 4 is carrying an RF signal on the transmission line provided by stripline 4 and groundplane 5. Groundplane 5 is subjected to heavy injection of excess energetic quasi-particles by injector 6 as controlled by modulation co...