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US 6,150,900 AGranted
Surface acoustic wave filter duplexer and communications apparatus utilizing edge reflection of SH-type waves
AssigneeMurata Manufacturing Co., Ltd.
InventorsMichio Kadota, Hideya Horiuchi, Mamoru Ikeura
Life of this patent
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Abstract
A surface acoustic wave filter includes edge-reflection type surface acoustic wave resonators arranged as series and parallel arm resonators and connected in a ladder configuration. The edge-reflection type surface acoustic wave resonators defining the series and parallel arm resonators are disposed on a single common substrate and arranged so as to be substantially parallel to the end surface of the edge-reflection type surface acoustic wave resonators.
Claims21
A surface acoustic wave filter comprising:
- a piezoelectric substrate having a pair of opposed end surfaces;
- and
- a plurality of edge-reflection type surface acoustic wave resonators arranged to define series and parallel arm resonators and are connected in a ladder configuration;
- wherein
- each of the edge-reflection type surface acoustic wave resonators defining the series and parallel arm resonators is disposed on the substrate and arranged along both of the opposed end surfaces of the piezoelectric substrate such that each of the edge-reflection type surface acoustic wave resonators operates using an SH-type surface acoustic wave and uses the opposed end surfaces of the piezoelectric substrate to reflect the SH-type surface acoustic wave to cause resonation.
2 more elements
A duplexer comprising:
- a surface acoustic wave filter including:
- a piezoelectric substrate;
- and
- a plurality of edge-reflection type surface acoustic wave resonators arranged to define series and parallel arm resonators and are connected in a ladder configuration;
- wherein
- each of the edge-reflection type surface acoustic wave resonators defining the series and parallel arm resonators is disposed on the substrate and arranged along both of the opposed end surfaces of the piezoelectric substrate such that each of the edge-reflection type surface acoustic wave resonators operates using an SH-type surface acoustic wave and uses the opposed end surfaces of the piezoelectric substrate to reflect the SH-type surface acoustic wave to cause resonation.
3 more elements
Dependencies are inferred from the claim text.