FERROELECTRIC CERAMIC FILTERS IF TRANSFORMERS, AND NETWORKS.
Quarterly rept. no. 7, 1 June-31 Aug 63,
CLEVITE CORP CLEVELAND OHIO
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Experimental and theoretical investigations have demonstrated feasibility of multi-resonator filter networks as an integral part of a single ATcut quartz wafer. Theory has been extended with the numerical evaluation of the eigen-frequencies for the first 6 inharmonic overtone modes as functions of two-dimensional resonator parameters. Resulting design criteria are discussed. Realization of groups of interconnected resonators, all as part of a single quartz wafer, introduces a set of problems first, obtaining accurately located, adherent, low-loss electrode patterns second, measuring the response of individual resonators without interference from electrical coupling with other resonators and third, tuning individual resonators by adjusting electrode thickness. Workable though not totally satisfactory solutions to these problems appear to be gold over aluminum electrodes with photoetching, shielded spring-clip measuring fixtures and liquid damping of other resonators as required, and spot electroplating using a standard gold cyanide plating solution. Author