Surface acoustic wave apparatus and communication apparatus

Details Surface acoustic wave apparatus and communication apparatus Surface acoustic wave apparatus and communication apparatus

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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patent: WO 01/71911 (2001-09-01), None

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