Surface acoustic wave filter and communications apparatus using the same

A surface acoustic wave filter has a piezoelectric substrate and at least two interdigital transducer electrodes on the piezoelectric substrate,wherein at least one of the interdigital transducer electrodes includes a unidirectional electrode and bidirectional electrode, andthe length lambdad of a b...

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Main Authors MATSUNAMI KEN, IGAKI TSUTOMU, NISHIMURA KAZUNORI, NAKAMURA HIROYUKI, YAMADA TORU, TSUZUKI SHIGERU, ISHIZAKI TOSHIO
Format Patent
LanguageEnglish
Published 23.03.2004
Edition7
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
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Summary:A surface acoustic wave filter has a piezoelectric substrate and at least two interdigital transducer electrodes on the piezoelectric substrate,wherein at least one of the interdigital transducer electrodes includes a unidirectional electrode and bidirectional electrode, andthe length lambdad of a basic cell of the unidirectional electrode is longer than the length lambdas of a basic cell of the bidirectional electrode.
Bibliography:Application Number: US20020114866