Patent Number: 6,297,712

Title: Multi-mode edge reflection saw filter device with ground electrodes between stages, duplexer, and communication device

Abstract: A surface acoustic wave filter apparatus includes a plurality of stages of multi-mode filters defined by edge-reflection type surface acoustic wave devices and electrically connected in series with each other. The plurality of stages of multi-mode filters are provided on a common piezoelectric substrate and arranged in a direction which is substantially perpendicular to the propagation direction of surface acoustic waves. Ground electrodes are located between the stages of the plurality of stages of multi-mode filters.

Inventors: Kadota; Michio (Kyoto, JP), Morii; Haruo (Kanazawa, JP), Morozumi; Kazuhiko (Yokohama, JP), Ago; Junya (Nagaokakyo, JP), Horiuchi; Hideya (Kyoto, JP)

Assignee: Murata Manufacturing Co., Ltd.

International Classification: H03H 9/145 (20060101); H03H 009/72 (); H03H 009/64 ()

Expiration Date: 10/02/2018