Variable capacitance membrane actuator for wide band tuning of microstrip resonators and filters
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United States of America Patent
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Jul 15, 2008
Grant Date -
Mar 29, 2007
app pub date -
Nov 30, 2006
filing date -
Oct 21, 2002
priority date (Note) -
In Force
status (Latency Note)
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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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