Surface acoustic wave filter, balanced type circuit, and communication apparatus
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United States of America Patent
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app pub date -
Mar 24, 2006
filing date -
Mar 6, 2002
priority date (Note) -
Abandoned
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Abstract
A surface acoustic wave filter including a piezoelectric substrate, IDT electrodes which are formed on the piezoelectric substrate and are connected to balanced type terminals. Further, IDT electrodes are formed on the piezoelectric substrate and are connected to an unbalanced type terminal, connection electrodes of connecting the IDT electrodes, the IDT electrodes IDT electrodes to the balanced type terminals or the unbalanced type terminal, and a dielectric thin film formed between the piezoelectric substrate and the IDT electrodes, the IDT electrodes, the connection electrodes.
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