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Title:
ELASTIC SURFACE WAVE RESONATOR AND ELASTIC SURFACE WAVE FILTER USING THE SAME
Document Type and Number:
WIPO Patent Application WO/2005/067141
Kind Code:
A1
Abstract:
An elastic surface wave resonator includes a piezoelectric substrate (11), an IDT (13) formed by a plurality of electrode fingers (12) arranged on the surface of the piezoelectric substrate (11), and a reflector (14) arranged in the vicinity of both ends of the IDT (13). The IDT has a gradation region where the electrode finger pitch of the electrode fingers (12) at both ends of the IDT (13) is different from the electrode finger pitch around the center of the IDT (13). The electrode finger pitch in the gradation region successively changes the electrode finger pitch from the electrode finger at one end of the gradation region toward the electrode finger at the other end of the gradation region. The electrode finger pitch of the electrode finger at the one end of the gradation region is set smaller than the electrode finger pitch around the center portion of the IDT (13) by 1 to 5%.

Inventors:
IGAKI TSUTOMU
NISHIMURA KAZUNORI
IKEDA KAZUO
MATSUNAMI KEN
Application Number:
PCT/JP2005/000320
Publication Date:
July 21, 2005
Filing Date:
January 06, 2005
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
IGAKI TSUTOMU
NISHIMURA KAZUNORI
IKEDA KAZUO
MATSUNAMI KEN
International Classes:
H03H9/145; H03H9/64; (IPC1-7): H03H9/145; H03H9/64
Foreign References:
JPS61142811A1986-06-30
JP2002528987A2002-09-03
JPH10242799A1998-09-11
JPH1188112A1999-03-30
JPH08242140A1996-09-17
Attorney, Agent or Firm:
Iwahashi, Fumio c/o Matsushita Electric Industrial Co. Ltd. (1006, Oaza Kadoma, Kadoma-sh, Osaka 01, JP)
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