Surface acoustic wave device, and mobile communication...

Details Surface acoustic wave device, and mobile communication... Surface acoustic wave device, and mobile communication...

2006-09-19

2006-09-19

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000, C310S31300R, C310S312000, C310S364000

Reexamination Certificate

active

07109828

ABSTRACT:
In a surface acoustic wave (SAW) device, such as a SAW resonator or a SAW filter, loss is minimized and steep characteristics are improved. IDT electrodes and a reflector are provided to a piezoelectric substrate cut out at a cut-angle which allows the substrate to excite a leaky surface acoustic wave (LSAW). The IDT electrodes have a given film thickness and a given pitch “p” of finger-electrodes. A phase velocity of the SAW is reduced to slower than a phase velocity “vb”of a slow shear wave propagating on the piezoelectric substrate, and a resonance frequency “f” satisfies a relation of 2×p≦vb/f. This structure allows the use of a Rayleigh surface acoustic wave (RSAW) which does not produce propagation loss, and improving insertion-loss and steep characteristics from those of a conventional SAW device using the LSAW.

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Koskela et al.; “Suppresion of the Leaky SAW Attenuation With Heavy Mechanical Loading”; IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 45, No. 2, Mar. 1998, pp. 439-449.

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