Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1980-09-02
1982-11-23
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
310348, 333187, H03H 905, H03H 915, H03H 958
Patent
active
043607926
ABSTRACT:
A crystal network device (10 or 200) includes a plurality of separable interconnected crystal resonator devices (12, 14, 16 and 18 or 202, 204 and 206) having different resonant frequencies. Each of the crystal resonator devices comprises a molded plastic support member (22, 68, 90, 142 or 208, 264, 283) having a plurality of unitary terminals (32, 120 or 222, 264, 292), which may be of J-shaped construction, mounted thereon. Each crystal resonator device (12, 14, 16, 18 or 202, 204, 206) also includes a crystal resonator plate (30, 84, 102, 150 or 224, 268, 298) mounted on a respective one of the support members (22, 68, 90, 142 or 208, 264, 283) by lead wires (54, 138 or 226, 270, 300) extending from the plate and bonded to enlarged wire terminating sections (48, 126 or 230, 274, 304) of the terminals (32, 120 or 122, 264, 292) so as to produce a free wire length of the lead wires on the order of an odd multiple of one-quarter wave length of the respective lead wires, when the lead wires are resonant at the resonant frequency of their respective crystal resonator plates. Legs (36, 122 or 218, 260, 290) of the terminals (32, 120 or 122, 264, 292) project from the crystal network device (10 or 200) for mounting and interconnecting the device on a printed circuit board (20 or 310).
REFERENCES:
patent: 2155035 (1939-04-01), Bieling
patent: 2358087 (1944-09-01), Lane
patent: 4066317 (1978-01-01), Bierenfeld et al.
patent: 4070502 (1978-01-01), Vig et al.
Jennings John D.
Killerby Walter E.
Reynolds Robert L.
Bell Telephone Laboratories Inc.
Bosben D. D.
Nussbaum Marvin L.
Western Electric Company Inc.
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