Dielectric fluid variable capacitor

A method of adjusting capacitance of a variable capacitor, comprising:

• providing an enclosure having an interior;
• providing a movable capacitor plate assembly disposed in the interior of the enclosure, the movable capacitor plate assembly including a first capacitor plate, a first electrode, and a first mounting plate;
• providing a first flexible structure having a first end sealed around an opening into the interior of the enclosure and a second end sealed to a rear side of the first mounting plate;
• providing a fixed capacitor plate assembly disposed proximal to the first capacitor plate assembly, the fixed capacitor plate assembly including a second capacitor plate, a second electrode, and a second mounting plate;
• providing an actuator coupling assembly coupled to the rear side of the first mounting plate;
• providing an actuator having a longitudinal axis, extending into the opening and through the first flexible structure, a distal end of the actuator engaging with the actuator coupling assembly, the actuator for advancing and retracting the movable capacitor plate assembly with respect to the fixed capacitor plate assembly;
• providing a second flexible structure, disposed on a rear side of the second mounting plate and sealed around an aperture in the second mounting plate;
• providing a dielectric liquid sealed within a volume of the enclosure outside of the first flexible structure and within the second flexible structure, the dielectric liquid serving as a dielectric between the first capacitor plate and the second capacitor plate;
• advancing the movable capacitor plate assembly toward the fixed capacitor plate assembly to increase capacitance of the variable capacitor, wherein the advancing of the movable capacitor plate assembly displace a volume of the dielectric liquid through the aperture in the second mounting plate into the second flexible structure and expanding the second flexible structure;
• retracting the moveable capacitor plate assembly away from the fixed capacitor plate assembly to decrease capacitance of the variable capacitor, wherein the retracting of the movable capacitor plate assembly draws a volume of the dielectric liquid out of the second flexible structure and contracting the second flexible structure.