Coupled-dual resonator crystal

Details Coupled-dual resonator crystal Coupled-dual resonator crystal

1987-03-13

1989-05-23

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310320, 333188, 29 2535, H03H 956, H03H 9205

Patent

active

048334308

ABSTRACT:
A dual-coupled resonator crystal is fine-tuned by frequency balancing the input and output resonators and thereafter plating a coupling adjust spot on the grounded side shadowing the unelectroded region of the front side of the crystal to produce a change in synchronous peak separation frequency. Thereafter, the front side electrodes are sequentially plated to bring plateback and synchronous peak separation frequency to their target values. Interim adjustments in synchronous peak separation frequency may be made during the tuning process to compensate for misalignment of the plating elements.

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