Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1979-12-11
1981-12-01
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333191, H03H 954, H03H 956
Patent
active
043038972
ABSTRACT:
The invention relates to a crystal filter structure of the polylithic type or built of discrete filter resonators for realizing a ladder filter with a number of L-links. Each link consists of two resonators (21) integrated on a quartz crystal plate (21) and weakly acoustically connected to form a quartz crystal element. The quartz crystal element are alternately arranged and fastened on opposite sides of a substrate plate, the resonators on different crystal elements are galvanically connected through metallic layers at the one of the longitudinal edges of the substrate plate and the intermediate edge surface. A common ground connection for all links is formed of metallic layers at the second longitudinal edge surface of the substrate plate. The connections of the "hot" electrodes are suitably turned towards the substrate plate and the input and the output of the filter are arranged on the opposite short sides of the substrate plate.
REFERENCES:
patent: 2124596 (1938-07-01), Sykes
patent: 3209178 (1965-09-01), Koneval
patent: 3453711 (1969-07-01), Miller
patent: 3723920 (1973-03-01), Sheahan et al.
Nussbaum Marvin L.
Telefonaktiebolaget L M Ericsson
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