Title:
SINGLE-PORT SURFACE ACOUSTIC WAVE RESONATOR AND SURFACE ACOUSTIC WAVE FILTER
Document Type and Number:
WIPO Patent Application WO/2005/011117
Kind Code:
A1
Abstract:
A single-port surface acoustic wave resonator in which frequency variation can be reduced while improving the Q-value in antiresonance frequency. The single-port surface acoustic wave resonator (1) comprises a rotary Y cut LiTaO3 substrate (2), an interdigital electrode (3) formed on the LiTaO3 substrate (2), and reflectors (4, 5) provided on the opposite sides of the interdigital electrode (3) in the propagating direction of surface wave. Assuming the width of the electrode finger of the interdigital electrode (3) is a, and the gap between the electrode fingers is b, metallization ratio a/(a+b) is set in the range of 0.55-0.85 and the interdigital electrode (3) is subjected to cross width weighting.
Inventors:
NAKAO TAKESHI (JP)
KOMURA TOMOHISA (JP)
KADOTA MICHIO (JP)
KOMURA TOMOHISA (JP)
KADOTA MICHIO (JP)
Application Number:
PCT/JP2004/008116
Publication Date:
February 03, 2005
Filing Date:
June 10, 2004
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
NAKAO TAKESHI (JP)
KOMURA TOMOHISA (JP)
KADOTA MICHIO (JP)
NAKAO TAKESHI (JP)
KOMURA TOMOHISA (JP)
KADOTA MICHIO (JP)
International Classes:
H03H9/02; H03H9/145; H03H9/25; H03H9/64; (IPC1-7): H03H9/64
Foreign References:
| JP2000151355A | 2000-05-30 | |||
| JPH1065481A | 1998-03-06 | |||
| US20020067227A1 | 2002-06-06 |
Attorney, Agent or Firm:
Miyazaki, Chikara (5-4 Tanimachi 1-chome, Chuo-k, Osaka-shi Osaka 12, JP)
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