Coating processes – Electrical product produced – Piezoelectric properties
Patent
1977-05-13
1978-09-05
Smith, John D.
Coating processes
Electrical product produced
Piezoelectric properties
29 2535, 310320, 333 72, 427 8, 427 10, 427 58, H03H 302, H03H 304
Patent
active
041121473
ABSTRACT:
A method of manufacturing a monolithic crystal filter, and particularly a filter having a high midband frequency (e.g., 20 MHz or above) and a wide resonator coupling (e.g., 4 KHz or above), involves the plating of additional electrode material onto a pair of base-plated split electrodes on one side of a crystal wafer to establish a desired coupling between resonators of the filter. Additional electrode material then is plated onto a base-plated solid electrode on the opposite side of the crystal wafer to establish a desired midband frequency of the filter. When the electrodes are plated in this sequence, the resonator coupling decreases substantially during the additional plating of the split electrodes, but remains essentially constant, within tolerance limits, during the plating of the solid electrode, whereby further adjustment of the coupling is not necessary.
REFERENCES:
patent: 3549414 (1970-12-01), Curran et al.
patent: 3564463 (1971-02-01), Beaver et al.
patent: 3573672 (1971-04-01), Fair et al.
patent: 3760471 (1973-09-01), Borner
patent: 3864161 (1975-02-01), Thompson
patent: 4028647 (1977-06-01), Yee
Bosben D. D.
Smith John D.
Western Electric Company Inc.
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