Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1979-12-10
1981-10-27
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
310348, 333192, H03H 950, H03H 956, H03H 958, H03H 960
Patent
active
042976596
ABSTRACT:
The invention relates to a crystal filter structure of polylithic type for realizing a filter with a number of links. The structure is formed by quartz crystal elements (21, R1, R2, 22, R3, R4, . . .) each containing two resonators (R1, R2) and associated electrode connections (301, 302, 311, 312). The quartz crystal elements are alternately arranged and fastened on mutual sides of a substrate plate (1), the resonators being galvanically connected through metallic layers (m21-23, m31-33, . . .) at one of the longitudinal edges of the substrate plate and the intermediate edge surface. The connections (312, 322, 332, 342, . . .) of the "hot" electrodes are suitably turned towards the substrate plate. The input and the output of the filter (A and B respectively) are arranged at the opposite placed short sides of the substrate plate and possible earth connections (0) are commonly connected through metallic layers (m01, m02, . . .) at the second longitudinal edge of the substrate plate.
REFERENCES:
patent: 3209178 (1965-09-01), Koneval
patent: 3553458 (1969-07-01), Curran et al.
patent: 3916490 (1975-11-01), Sheahan et al.
Nussbaum Marvin L.
Telefonaktiebolaget L M Ericsson
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