Patent ID: 7117025

Claim:
A tuning device for a cryo-cooled bandpass filter, comprising a. a resonator element physically located in a cryo-cooled chamber; b. a voltage-sensitive capacitor operatively connected to the resonator element, wherein when a variable voltage is applied to the voltage-sensitive capacitor, the capacitance of the capacitor is varied, and the resonator frequency changes and shifts the passband characteristics of the filter, the voltage-sensitive capacitor also being physically located in the cryo-cooled chamber, whereby the resonator can be tuned remotely after the cryo-cooled chamber is sealed; c. a voltage regulator operatively connected to the voltage-sensitive capacitor, wherein the voltage regulator comprises an inductor and a capacitor; and d. a computer configured and arranged to automatically monitor the output of the filter and to remotely provide real time tuning of the filter.