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Damping layer for surface wave filter

  • US 4,575,653 A
  • Filed: 09/15/1983
  • Issued: 03/11/1986
  • Est. Priority Date: 09/23/1982
  • Status: Expired due to Term
First Claim
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1. A surface wave filter with a polygonal of at least four sides, slab-shaped substrate of monocrystalline piezoelectric material comprising a slab-shaped monocrystalline piezoelectric material, input and output transducers optionally coupled by means of a coupler on one substrate side of the slab of piezoelectric material, electric conductor runs extending from the input and output transducers with each run terminating in an end, a damping layer with a level surface for suppressing partially reflected waves which are generated at cut ends of the substrate and are also caused by crystal structure faults in the substrate, which layer covers at least in some regions said one substrate side except for the area which is bounded by the transducers, the coupler, the ends of the conductor runs and the regions between the transducers and the coupler, the combination therewith wherein the end face edge of the damping layer increases in thickness with a continuous grade from zero to the value of the layer thickness to also suppress interfering waves reflected by the end face edges of the damping layer.

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