Acoustic wave filter with reduced bulk-wave scattering loss and

Details Acoustic wave filter with reduced bulk-wave scattering loss and Acoustic wave filter with reduced bulk-wave scattering loss and

1994-05-31

1995-07-18

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 333195, H01L 4108

Patent

active

054344662

ABSTRACT:
An acoustic wave filter with reduced bulk-wave scattering loss has a center frequency and an associated acoustic wavelength. The filter includes a substrate and a first reflector having a first group of periodically disposed reflective elements. The filter includes a first transducer on a first side of the first reflector. The filter also includes a first gap having a first width, located between the first reflector and the first transducer. The first width exceeds one-fourth of the acoustic wavelength. The filter includes a second reflector and a second gap disposed between the first transducer and the second reflector. The second gap has a second breadth exceeding one-fourth of the acoustic wavelength. A first waveguiding element is positioned within the first gap and having a first breadth. The first width exceeds the first breadth.

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"A Fast Green's Function Method For Calculating Bulk Wave Frequency Responses From Saw Frequency Responses" by K. C. Wagner and O. Manner of Siemens Ag, Central Research Laboratories, Munich, Germany and Siemens AG Austria, ETG 323, Vienna Austria, from IEEE 1990 Ultrasonics Symposium--411.

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