Surface acoustic wave duplexer having enhanced isolation...

Details Surface acoustic wave duplexer having enhanced isolation... Surface acoustic wave duplexer having enhanced isolation...

2007-03-27

2007-03-27

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S195000

Reexamination Certificate

active

11046212

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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