Variable capacitor, filter and NMR sensor comprising such a capacitor
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United States of America Patent
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Jul 5, 2005
Grant Date -
Jul 24, 2003
app pub date -
Jan 22, 2003
filing date -
Jan 22, 2002
priority date (Note) -
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Abstract
A variable capacitor includes a first component made of conductive material in the form of an at least partially hollow rod, comprising a hole or perforation extending axially into the body of the first component to form a tube portion, and a second component also made of conductive material in the form of a rod able to be fitted to a variable depth into the axial hole, the engagement depth of the second component in the first component determining the degree of capacitive coupling between them and therefore the value of the resulting capacitor. The capacitor tube portion is provided on its internal face, preferably substantially over the whole depth of the axial hole, with a layer of dielectric material, the latter extending in a continuous manner over the edge defining the access aperture of the hole and onto an adjacent part of the external face of the tube portion.
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