Surface acoustic wave filter
AssigneeMurata Manufacturing Co., Ltd.
InventorsMiki Takamiya, Norio Taniguchi
Life of this patent
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Abstract
A surface acoustic wave filter includes a piezoelectric substrate, and at least two series arm resonators and at least one parallel arm resonator each constituted by a one-port surface acoustic wave resonator, disposed on the piezoelectric substrate. The at least two series arm resonators and at least one parallel arm resonator are connected to define a ladder-type circuit. Each of the at least two series arm resonators includes an interdigital transducer weighted by apodization, and the apodizations for the at least two series arm resonators are different from each other.
Claims17
A surface acoustic wave filter comprising:
- a piezoelectric substrate;
- at least two series arm resonators and at least one parallel arm resonator each defined by a one-port surface acoustic wave resonators and disposed on said piezoelectric substrate, said at least two series arm resonators and at least one parallel arm resonator being connected to define a ladder-type circuit;
- wherein each of said at least two series arm resonators includes an interdigital transducer weighted by apodization, and the apodizations for said at least two series arm resonators are different from each other.
Dependencies are inferred from the claim text.