A switchable inductor

H - Electricity – 01 – P

Patent

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H01P 3/08 (2006.01) H01L 39/16 (2006.01)

Patent

CA 2337874

An inductor for microwave frequencies has a substantially planar structure and is constructed of a transmission line designed as a linear microstrip element made of a central line (5) comprising normal electrically conducting material, such as a suitable metal. The microstrip element has a width which is varied by making areas (7) at sides of the central line (5) superconducting. In changing the effective width of the microstrip the inductance thereof is changed accordingly. The areas at the sides of the microstrip element are located directly at the central, normal metal conductor. These areas have in the non-superconducting state some electrical conductivity which can be rather low but owing to the fact that they contact the normal central metal conductor only at a very narrow edge instead of contacting it at a large surface they do not significantly affect the transmission characteristics of the transmission path when the superconducting areas (7) are in their normal state.

L'invention concerne un inducteur pour hyperfréquences, de structure sensiblement plane, constitué d'une ligne de transmission conçue sous la forme d'un élément microbande linéaire comportant une ligne (5) centrale comprenant un matériau électroconducteur normal, par exemple un métal approprié. La largeur de l'élément microbande peut être modifiée en rendant les zones (7) de part et d'autre de la ligne (5) centrale supraconductrices. La modification de la largeur effective de la microbande permet de modifier en conséquence l'induction de ladite microbande. Les zones de part et d'autre de l'élément microbande se situent directement u niveau du conducteur métallique central. Ces zones possèdent, à l'état non supraconducteur, une certaine conductivité électrique, qui peut être plutôt faible mais qui, du fait qu'elles ne sont au contact du conducteur métallique normal qu'au niveau d'une arête très étroite et non au niveau d'une large surface, n'ont qu'une faible incidence sur les caractéristiques de transmission du chemin de transmission, lorsque les zones supraconductrices se trouvent dans leur état normal.

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