Electricity: electrical systems and devices – Electrostatic capacitors – Variable
Reexamination Certificate
2008-07-15
2008-07-15
Ha, Nguyen T (Department: 2831)
Electricity: electrical systems and devices
Electrostatic capacitors
Variable
C361S272000, C361S278000, C361S283100, C361S283200, C361S290000
Reexamination Certificate
active
11606734
ABSTRACT:
A device for varying the capacitance of an electronic circuit is disclosed. The device comprises a flexible membrane located above the electronic circuit, a metal layer connected to the flexible membrane, and bias circuitry located above the membrane. Variation of the capacitance of the electronic circuit is obtained by pulling the membrane upwards by means of the bias circuitry. The disclosed device provides a sizeable capacitance variation and high Q factor, resulting in overall low filter insertion loss. A nearly constant group delay over a wide operating bandwidth is also obtained.
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Lynch Jonathan J.
Mehta Sarabjit
Pasiecznik John
Petre Peter
Ha Nguyen T
HRL Laboratories LLC
Ladas & Parry
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