Surface acoustic wave device, surface acoustic wave filter...

Details Surface acoustic wave device, surface acoustic wave filter... Surface acoustic wave device, surface acoustic wave filter...

2007-02-14

2011-10-11

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000, C333S195000, C310S31300R, C310S31300R, C029S025350, C204S192100, C427S100000

Reexamination Certificate

active

08035460

ABSTRACT:
A surface acoustic wave device includes a substrate including lithium niobate; a IDT being provided on an upper surface of the substrate and including a plurality of electrode fingers; and a protective film covering the IDT and having an uneven shape on an upper surface thereof. When a pitch width of one pitch of the IDT is p, a width of one of the electrode fingers is p1, a width between the electrode fingers is p2, and a thickness of the IDT is h, following relations are satisfied, p1+p2=p, and h/(2×p)≧4.5%. With this configuration, an appropriate reflection characteristic is realized, and the surface acoustic wave device having excellent temperature coefficient of frequency and electrical characteristic can be obtained.

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