FERROELECTRIC CERAMIC FILTERS IF TRANSFORMERS, AND NETWORKS.
Abstract
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 14, 1963
- Accession Number
- AD0423977
Entities
People
- Damian Curran
- W. J. Gerber