Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2006-01-10
2006-01-10
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S193000, C333S195000, C333S196000, C310S31300R
Reexamination Certificate
active
06985048
ABSTRACT:
A longitudinally-coupled-resonator-type surface acoustic wave filter includes three interdigital transducers provided on a piezoelectric substrate in the direction in which surface acoustic waves propagate. An interdigital transducer disposed at the approximate center among the three interdigital transducers of the longitudinally-coupled-resonator-type surface acoustic wave filter is divided into two parts substantially symmetrically in the propagation direction of the surface acoustic waves and the two parts are connected to balanced signal terminals, respectively. Left and right interdigital transducers of which the polarities are inverted relative to each other are connected to an unbalanced signal terminal to provide a balanced-to-unbalanced conversion function. A reactance component provided on the piezoelectric substrate, inside a package, or outside the package is connected to either of the balanced signal terminals.
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Shibahara Teruhisa
Takamine Yuichi
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
Summons Barbara
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