Transducer structure that operates with acoustic waves
First Claim
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1. 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.
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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.
49 Citations
15 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
Specification