Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2007-05-01
2007-05-01
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S193000, C310S31300R
Reexamination Certificate
active
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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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.
Kadota Michio
Komura Tomohisa
Mimura Masakazu
Nakao Takeshi
Taniguchi Norio
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
Summons Barbara
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