Ladder type filter
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United States of America Patent
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Issued Date -
Jun 5, 2008
app pub date -
Oct 16, 2007
filing date -
Oct 17, 2006
priority date (Note) -
Abandoned
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Abstract
A ladder filter includes a series resonator having a first film laminate in which an upper electrode and a lower electrode face each other across a piezoelectric film, and a first film provided on the first film laminate, and a parallel resonator having a second film laminate having a structure similar to that of the first film laminate, a second film provided on the second film laminate, and another first film identical to the first film.
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