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US 6,549,100 B2Granted
Surface acoustic wave lattice filter with different lattice and series arm capacitance ratios and communication device using same
AssigneeMurata Manufacturing Co., Ltd.
InventorNorio Taniguchi
Life of this patent
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Abstract
A surface acoustic wave filter includes a piezoelectric substrate and a plurality of surface acoustic wave resonators mounted on the piezoelectric substrate. The plurality of surface acoustic wave resonators are connected so as to constitute a lattice-type circuit having series-arm resonators and lattice-arm resonators, and a capacitance ratio γ value of the lattice-arm resonators and a capacitance ratio γ value of the series-arm resonators are made different from each other.
Claims22
A surface acoustic wave filter comprising:
- a piezoelectric substrate;
- and
- a plurality of surface acoustic wave resonators disposed on the piezoelectric substrate;
- wherein the plurality of surface acoustic wave resonators are connected so as to constitute a lattice-type circuit having series arm resonators and lattice arm resonators, and a capacitance ratio γ value of the lattice arm resonators and a capacitance ratio γ value of the series arm resonators are different from each other.
1 more element
A communication device comprising:
- at least one surface acoustic wave filter including:
- a piezoelectric substrate;
- and
- a plurality of surface acoustic wave resonators disposed on the piezoelectric substrate;
- wherein the plurality of surface acoustic wave resonators are connected so as to constitute a lattice-type circuit having series-arm resonators and lattice-arm resonators, and a capacitance ratio γ value of the lattice-arm resonators and a capacitance ratio γ value of the series-arm resonators are different from each other.
2 more elements
Dependencies are inferred from the claim text.