Surface acoustic wave device having two piezoelectric...

Wave transmission lines and networks – Plural channel systems – Having branched circuits

Reexamination Certificate

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C333S193000, C310S31300R

Reexamination Certificate

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11531003

ABSTRACT:
A surface acoustic wave branching filter includes a first filter and a second filter each including a plurality of surface acoustic wave resonators arranged in a ladder circuit configuration. The first filter in which the frequency range of the passband is relatively low is provided on a first piezoelectric substrate, and the second filter in which the frequency range of the passband is relatively high is provided on a second piezoelectric substrate. The first piezoelectric substrate and the second piezoelectric substrate are rotation Y-cut X-propagation LiTaO3substrates, and the cut angle of the first piezoelectric substrate is greater than the cut angle of the second piezoelectric substrate.

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International Search Report issued in the corresponding International Application No. PCT/JP2005/003519, mailed on Jun. 21, 2005.
Sato et al., “Optimum Cut for Rotated Y-Cut LiNbO3 Crystals Used as the Substrate of Elastic Surface Wave Filters,” The Journal of the Acoustical Society of Japan, vol. 30, No. 10, Oct. 1974, pp. 549-556.

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