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US 4,375,626 AGranted
Precision linear tuning circuit
AssigneeThe United States of America as represented by the National Security Agency
InventorJohn J. Hudak
Life of this patent
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Abstract
A precision linear tuning circuit having particular utility to applications employing superconductors in a supercooled environment. Two capacitors, one fixed and one variable, are connected in parallel by an arrangement of shared, concentric electrodes. The variable capacitor includes one electrode and a movable facing dielectric which are tapered such that displacement of the dielectric results in a linear variation in tuning frequency.
Claims5
An electrical circuit wherein tuning is achieved by varying circuit capacitance comprising:
- a variable capacitor, comprising:
- a first electrode fixed on an axis;
- a second electrode fixed concentrically about said first electrode such that the facing walls of the electrodes define a gap therebetween, and
- a dielectric movably positioned concentrically within the gap between said first and second electrodes, the facing walls of one electrode and the dielectric being tapered relative to said axis and the facing walls of the other electrode and the dielectric being untapered relative to said axis, and
- a fixed capacitor electrically connected in parallel with said variable capacitor.
2 more elements
Dependencies are inferred from the claim text.