Surface acoustic wave filter and communication unit

Details Surface acoustic wave filter and communication unit Surface acoustic wave filter and communication unit

2007-03-13

2007-03-13

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S133000

Reexamination Certificate

active

10521776

ABSTRACT:
In a longitudinally-coupled-resonator surface acoustic wave filter unit having a first interdigital transducer, a central interdigital transducer, a second interdigital transducer, and first and second reflectors arranged such that the interdigital transducers are provided therebetween, for one comb electrode of the central interdigital transducer, first and second comb electrodes, which are substantially symmetrically bisected along a surface-acoustic-wave propagation direction, are provided. Between the first and second comb electrodes, a design parameter of at least one of the interdigital transducers, and the reflectors is set to be different from one another.

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English translation of the Written Opinion of International Searching Authority International Application No. PCT/JP2004/011908.
Official Communication cited in corresponding European Patent Application No. 04771869.7-1233, dated Sep. 26, 2006.

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