Surface acoustic wave device and communications apparatus...

Details Surface acoustic wave device and communications apparatus... Surface acoustic wave device and communications apparatus...

2005-02-15

2005-02-15

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000, C310S31300R

Reexamination Certificate

active

06856218

ABSTRACT:
The invention provides an in-plane rotational ST-cut SAW resonator that is formed of an in-plane rotational ST-cut crystal plate having Eulerian angles of (0°, 113° to 135°, and ±(40° to 49°)). The in-plane rotational ST-cut SAW resonator can include an interdigital transducer (IDT) electrode for exciting a Rayleigh wave on the main surface. The ratio Lt/Pt of the electrode width Lt and the interelectrode pitch Pt of the IDT electrode is 0.5 or more and 0.65 or less. Accordingly, a reduction in the fluctuation in resonance frequency relative to the variations in an IDT electrode of a surface acoustic wave device by using the in-plane rotated ST-cut crystal plate around the Z′-axis can be achieved.

REFERENCES:
patent: 4670681 (1987-06-01), Wright
patent: 5895996 (1999-04-01), Takagi et al.
patent: 6031315 (2000-02-01), Abbott
patent: 6154105 (2000-11-01), Fujimoto et al.
patent: 61-73409 (1986-04-01), None
patent: 09-148879 (1997-06-01), None
patent: 2000-323955 (2000-11-01), None
patent: 3216137 (2001-08-01), None

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