Transducer structure that operates with acoustic waves
AssigneeEpcos AG
InventorsThomas Bauer, Martin Bünner, Andreas Detlefsen, Dietmar Ritter
Life of this patent
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Abstract
For improved conformance of a filter operating with acoustic waves, a transducer structure is provided in which the separations between respectively two adjacent electrode fingers of an inter-digital transducer (IDTv) vary over the length of the transducer. The variation thereby preferably follows a continuous distribution function. Reactance filters that are provided with such filters in the serial branch show an improved electrical conformance in the transmission range.
Claims15
A reflector-based resonator structure operating with acoustic waves with one or more inter-digital transducers (IDT) arranged between reflectors (Ref), at least one IDT comprising:
- two interlocking electrode combs having electrode fingers, the finger separations of the IDT, measured between finger centers of each two adjacent electrode fingers, varies over a length of the inter-digital transducer according to a continuous function and wherein a difference between the separations of adjacent electrode fingers amounts to a maximum of 5% viewed over the total length of the IDT.
Dependencies are inferred from the claim text.