Surface acoustic wave element and duplexer having the same

Details Surface acoustic wave element and duplexer having the same Surface acoustic wave element and duplexer having the same

2005-06-07

2005-06-07

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000, C333S195000

Reexamination Certificate

active

06903626

ABSTRACT:
A surface acoustic wave element includes surface acoustic wave (SAW) resonators arranged in a ladder formation on a piezoelectric substrate. A resonance frequency fS1of a series-arm resonator of a first stage viewed from an input side of the surface acoustic wave element and an average resonance frequency fSavof all of remaining series-arm SAW resonators satisfy 1.00fSav>fS1≧0.99fSav.

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