Method and apparatus for selectively blocking radio frequency (RF) signals in a radio frequency (RF) switching circuit
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United States of America Patent
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Oct 28, 2008
Grant Date -
Feb 1, 2007
app pub date -
Jul 27, 2005
filing date -
Jul 27, 2005
priority date (Note) -
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Abstract
An RF switching circuit that incorporates a film bulk acoustic resonator (FBAR) device and one or more capacitors that are used to vary the capacitance of the FBAR device to change the frequency range that is blocked by the FBAR device. When the RF switching circuit is in a first switching state, a first set of RF signals in a first frequency range is blocked by the RF switching circuit while RF signals of other frequencies are passed by the RF switching circuit. When the RF switching circuit is in a second switching state, a second set of RF signals in a second frequency range is blocked by the RF switching circuit while RF signals of other frequencies are passed by the RF switching circuit.
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