Damping layer for surface wave filter

Details Damping layer for surface wave filter Damping layer for surface wave filter

1983-09-15

1986-03-11

Wong, Peter S.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

333151, 333194, H03H 925, H01L 4122

Patent

active

045756538

ABSTRACT:
Surface wave filter with a slab-shaped substrate of monocrystalline piezoelectric material, particularly lithium niobate, having input and output transducers optionally coupled by means of a coupler on one substrate side. A plastic and/or elastic damping layer are applied for suppressing reflected waves. The damping layer covers, at least in some regions, this substrate side except for the area which is bounded by the transducers, the coupler, the ends of the conductor runs and the reions between the transducers and the coupler. The end face edge of the damping layer increases at least in sections, gradually from zero to the value of the layer thickness.

REFERENCES:
patent: 4004254 (1977-01-01), De Vries
patent: 4056803 (1977-11-01), White et al.
patent: 4063281 (1977-12-01), Kornreich et al.
patent: 4096455 (1978-06-01), Drummond

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