SURFACE ACOUSTIC WAVE ELEMENT - MITSUBISHI ELECTRIC CORP

Title:

SURFACE ACOUSTIC WAVE ELEMENT

Document Type and Number:

WIPO Patent Application WO/1999/044284

Kind Code:

A1

Abstract:

A surface acoustic wave element has a substrate, a first interdigital transducer which is mounted on the substrate, has first comb-tooth electrode fingers and transduces to output inputted electrical signals to surface acoustic waves, and a second interdigital transducer which is mounted on the substrate, has second comb-tooth electrode fingers and transduces to output inputted surface acoustic waves to electrical signals. The ratio of the line width of the first comb-tooth electrode fingers to the space width between the adjacent first comb-tooth electrode fingers is different from the ratio of the line width of the second comb-tooth electrode fingers. By adjusting the capacitive components of an input impedance and an output impedance by means of the first and the second interdigital transducer, the surface acoustic wave element can be matched with an external circuit, thereby reducing the entire size of the surface acoustic wave element.

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Inventors:

SAKAI ATSUSHI (JP)

Application Number:

PCT/JP1998/000728

Publication Date:

September 02, 1999

Filing Date:

February 24, 1998

Export Citation:

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Assignee:

MITSUBISHI ELECTRIC CORP (JP)
SAKAI ATSUSHI (JP)

International Classes:

H03H9/02; H03H9/145; H03H9/25; H03H9/64; (IPC1-7): H03H9/145; H03H9/25; H03H9/64

Foreign References:

JPS5087553A	1975-07-14
JPS6077509A	1985-05-02
JPS58200617A	1983-11-22

Other References: