Varactor tuning for a narrow band filter including an...

Details Varactor tuning for a narrow band filter including an... Varactor tuning for a narrow band filter including an...

2008-01-08

2008-01-08

Lee, Benny (Department: 2817)

Wave transmission lines and networks

Automatically controlled systems

C333S0990MP, C505S210000

Reexamination Certificate

active

07317364

ABSTRACT:
A method and 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 SrTiO3may 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.

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