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US 2004/0106383 A1Published application
Surface acoustic wave device and communication device using the same
AssigneeMurata Manufacturing Co., Ltd.
InventorMasaru Yata
Life of this patent
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Abstract
Two or more comb-shaped electrode portions (11, 12, 13, 21, 22, and 23) are provided on a piezoelectric substrate (60) so as to have a balanced-to-unbalanced conversion function. At least one of the adjacent electrode fingers at the boundaries of adjacent comb-shaped electrode portions (11, 12, 13, 21, 22, and 23) is connected to one of an unbalanced terminal (5) and balanced terminals (6 and 7).
Claims7
A surface acoustic wave device comprising:
- a piezoelectric substrate;
- at least one surface acoustic wave filter including at least two comb-shaped electrode portions arranged along a propagation direction of surface acoustic waves on the piezoelectric substrate, said at least one surface acoustic wave filter being arranged on the piezoelectric substrate so as to have a balanced-to-unbalanced conversion function;
- wherein
- at least one electrode finger of outermost electrode fingers in each of adjacent comb-shaped electrode portions is connected to a signal terminal.
1 more element
A surface acoustic wave device comprising:
- a piezoelectric substrate;
- at least one surface acoustic wave filter including at least two comb-shaped electrode portions arranged along a propagation direction of surface acoustic waves on the piezoelectric substrate, said at least one surface acoustic wave filter being arranged on the piezoelectric substrate so as to have a balanced-to-unbalanced conversion function;
- wherein
- electrode fingers facing each other in each of adjacent comb-shaped electrode portions are provided to be able to excite the surface acoustic waves between the electrode fingers.
1 more element
Dependencies are inferred from the claim text.