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US 6,720,847 B2Granted
Longitudinally-coupled resonator surface acoustic wave filter and communication apparatus using the same
AssigneeMurata Manufacturing Co., Ltd.
InventorsKatsuhiro Nako, Yuichi Takamine
Life of this patent
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Abstract
A longitudinally-coupled resonator surface acoustic wave (SAW) filter includes a piezoelectric substrate and at least two IDTs arranged in the direction along which a SAW propagates on the piezoelectric substrate. At least one of the IDTs has an electrode finger wherein the metallization ratio of the electrode finger is different from that of the other electrode fingers of the IDT.
Claims20
A longitudinally-coupled resonator surface acoustic wave (SAW) filter comprising:
- a piezoelectric substrate;
- and
- at least two interdigital transducers (IDTs) provided on the piezoelectric substrate along the direction in which a surface acoustic wave propagates;
- wherein
- at least one of the IDTs has an electrode finger with a metallization ratio that is different from that of other electrode fingers of the IDT.
2 more elements
Dependencies are inferred from the claim text.