A switchable low-pass filter

Details A switchable low-pass filter A switchable low-pass filter

H - Electricity

01

P

H01P 1/203 (2006.01)

Patent

CA 2337873

A low-pass or band-rejection filter for microwave frequencies has a substantially planar structure and is constructed of a transmission line having inductor portions (10) and wider capacitor portions (11). The inductor portions are designed as linear microstrip elements having widths being varied by making areas (13) at the sides of the linear elements (10) superconducting. In changing the widths of the transmission line also the inductances thereof are changed accordingly. The areas (13) at the sides of the microstrip elements comprise rather narrow areas located directly at the central, normal metal conductor (9). These narrow areas (13) have in the non-superconducting state some electrical conductivity which can be small but still not quite insignificant in relation to that of the metal conductor. However, owing to the fact that they contact the normal metal conductor (9) only at very narrow edges instead of contacting it at a large surface they do not significantly affect the transmission characteristics of the transmission line in the normal state of the areas which can be made superconducting.

L'invention concerne un filtre passe-bas ou coupe-bande pour hyperfréquences, de structure sensiblement plane, constitué d'une ligne de transmission comportant des parties (10) induction et des parties (11) condensateur, plus larges. Les parties induction sont conçues sous la forme d'éléments microbandes linéaires dont la largeur varie lorsqu'on rend les zones (13) de part et d'autre de ces éléments linéaires (10) supraconductrices. La modification de la largeur de la ligne de transmission permet de modifier en conséquence l'induction de ladite ligne. Les zones (13) de part et d'autre des éléments microbande comportent des zones, plutôt étroites, se situant directement au niveau du conducteur (9) central normal. Ces zones (13) étroites possèdent, à l'état non supraconducteur, une certaine conductivité électrique, qui quoique faible n'est pas insignifiante au regard de celle du conducteur métallique. Cependant, étant donné que ces zones ne sont au contact du conducteur métallique (9) normal qu'au niveau d'arêtes très étroites et non au niveau d'une large surface, elles n'ont qu'une faible incidence sur les caractéristiques de transmission de la ligne de transmission, lorsque ces zones se trouvent dans leur état normal, où il est alors possible de les rendre supraconductrices.

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