Surface acoustic wave duplexer having enhanced isolation performance
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United States of America Patent
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Mar 27, 2007
Grant Date -
Sep 22, 2005
app pub date -
Jan 28, 2005
filing date -
Jan 29, 2004
priority date (Note) -
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Abstract
A miniaturized SAW duplexer includes SAW filters carried on a monolithic piezoelectric chip that is mounted inside a multi-layered ceramic package. A phase matching stripline is embedded diagonally and between two ground layers of the multi-layered ceramic package and is positioned between a wall of vias for significantly minimizing coupling between transmitted and received filters by providing an improved ground shielding of the phase matching stripline. Coupling within the same filter and coupling between the SAW filters are suppressed and thus provide enhanced isolation performance. for the SAW duplexer.
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