Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1985-12-05
1987-06-09
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333151, 333154, H03H 9145
Patent
active
046723382
ABSTRACT:
An electrical surface acoustic wave filter with a wafershaped substrate (1) of monocrystalline, piezoelectric material, in particular lithium niobate, wherein one substrate side supports interdigital transducers (IW 1, IW 2) with metallic electrodes mutually engaging in comblike fashion for the stimulation and coupling out of the surface waves and with plastic and/or elastic damping compounds (10, 11) for the suppression of disturbing wave reflections. The damping compound (10, 11) is applied indirectly or directly to the substrate surface between the active interdigital transducer area "b" and the adjacent long substrate edges (4, 5) of at least one interdigital transducer (IW 1), and that at least in the inactive interdigital transducer areas (a, a).
REFERENCES:
patent: 4139791 (1979-02-01), Yamada et al.
patent: 4322651 (1982-03-01), Inoue et al.
patent: 4470026 (1984-09-01), Buckinx et al.
patent: 4472694 (1984-09-01), Lee
patent: 4567453 (1986-01-01), Schofield
patent: 4575653 (1986-03-01), Sinha
patent: 4604594 (1986-08-01), Angerer et al.
Abstract of Japanese Patent Document No. 57-13699, publication date Oct. 28, 1983.
Abstract of Japanese Patent Document No. 50-148875, Jun. 16, 1977.
Moran John Francis
Nussbaum Marvin L.
Siemens Aktiengesellschaft
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