Surface acoustic wave resonator, combined surface acoustic wave filter and surface acoustic wave filter


Application Number: 00108174
Application Date: 2000.04.28
Publication Number: 1272000
Publication Date: 2000.11.01
Priority Information: 1999/4/28 JP 122690/99
International: H03H9/25;H03H9/64
Applicant(s) Name: Murata Manufacturing Co., Ltd.
Address:
Inventor(s) Name: Fujii Hirohisa;Takamine Hirokazu
Patent Agency Code: 31100
Patent Agent: shen zhaokun
Abstract A surface acoustic wave resonator includes a piezoelectric substrate and an interdigital transducer on the piezoelectric substrate. The interdigital transducer includes first and second comb-shaped electrodes having one or more electrode fingers which are interdigitated with each other. When the first comb-shaped electrode is connected to a positive potential, the second comb-shaped electrode is connected to a negative potential, and the electrode finger connected to the positive potential and the electrode finger connected to the negative potential are reversed in at least one pair of the electrode fingers in an area where electrode fingers connected to the positive potential and electrode fingers connected to the negative potential are alternately arranged in the direction of surface-wave propagation.