Electricity: electrical systems and devices – Electrostatic capacitors – Variable
Reexamination Certificate
2005-07-26
2005-07-26
Nelms, David (Department: 2818)
Electricity: electrical systems and devices
Electrostatic capacitors
Variable
C361S277000, C361S279000, C361S302000, C438S106000, C438S117000
Reexamination Certificate
active
06922327
ABSTRACT:
A new type of high-Q variable capacitor includes a substrate, a first electrically conductive layer fixed to the substrate, a dielectric layer fixed to a portion of the electrically conductive layer, and a second electrically conductive layer having an anchor portion and a free portion. The anchor portion is fixed to the dielectric layer and the free portion is initially fixed to the dielectric layer, but is released from the dielectric layer to become separated from the dielectric layer, and wherein an inherent stress profile in the second electrically conductive layer biases the free portion away from the dielectric layer. When a bias voltage is applied between the first electrically conductive layer and the second electrically conductive layer, electrostatic forces in the free portion bend the free portion towards the first electrically conductive layer, thereby increasing the capacitance of the capacitor.
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Chua Christopher L.
Peeters Eric
Smith Donald L.
Van Schuylenbergh Koenraad F.
Nelms David
Nguyen Dao H.
Waldes Jeanette M.
Xerox Corporation
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