Varactor Tuning For A Narrow Band Filter
AssigneeConductus, Inc.
InventorsChien-Fu Shih, Yongming Zhang, Brian H. Moeckly
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Abstract
An apparatus for providing dynamic and remote tuning of a cryo-cooled bandpass filter is disclosed. The device includes resonator element and a voltage sensitive element as part of the capacitance in a narrow band filter circuit. A varactor such as a GaAs varactor may be used. Alternatively, a capacitor having a voltage-sensitive dielectric such as SrTiO3 may be used. A computer may be connected to the varactor to provide for automated tuning. The voltage-sensitive capacitor may be integral with the resonator element. The invention provides for remote and dynamic tuning of a narrow bandpass filter while located within its sealed cryo-cooled environment.
Claims11
A tuning circuit layout for a bandpass filter comprising
- a. a resonator element comprising a first and second end;
- b. a first shunt capacitor operatively coupled to the first end of the resonator;
- and
- c. a capacitor network exhibiting a variable total capacitance operatively coupled to the second end of the resonator, wherein the resonance of the resonator element is varied by varying the capacitance of the capacitor network.
Dependencies are inferred from the claim text.