SAW DEVICE AND COMMUNICATION DEVICE USING SAW DEVICE

A SAW device comprises input/output interdigital transducer (IDT) electrodes (11, 12) provided on piezoelectric substrates (10), a first reflector electrode (13) following the input IDT electrode (11), and a second reflector electrode (14) preceding the output IDT electrode (12). The device satisfie...

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Bibliographic Details
Main Authors IGAKI, TSUTOMU, MATSUNAMI, KEN, NISHIMURA, KAZUKI, TSUZUKI, SHIGERU
Format Patent
LanguageEnglish
French
German
Published 28.11.2001
Edition7
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
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Summary:A SAW device comprises input/output interdigital transducer (IDT) electrodes (11, 12) provided on piezoelectric substrates (10), a first reflector electrode (13) following the input IDT electrode (11), and a second reflector electrode (14) preceding the output IDT electrode (12). The device satisfies the following inequality (1) to provide preferable characteristics in a pass band: 2( - 5) </= tan<-1)<D / L) </= 2( +5) where : the inclination (in degree, except zero) of the first or second reflector electrode of the input and output IDT electrodes with respect to a plane perpendicular to the direction in which surface acoustic waves travel. D: the pitch (in micron) of the input and output IDT electrodes in the direction in which surface acoustic waves travel. L: the pitch (in micron) of the first and second reflector electrodes.
Bibliography:Application Number: EP20000981655