RESEARCH INTO NEW APPROACHES FOR VHF FILTER CRYSTALS.
Quarterly rept. no. 8, 16 Apr-15 Jul 65,
CLEVITE CORP CLEVELAND OHIO ELECTRONIC RESEARCH DIV
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Experiments in which resonator Q sub m is observed as a function of electrode length were continued in an attempt to correlate these data with the theoretical results obtained by Professor R. D. Mindlin from a consideration of intermode coupling. Results to data have been inconclusive. Initial attempts to fabricate 90 Mc, 5th harmonic mode inverted mesa resonators using deposited films indicated that substantial improvement in techniques for alignment between resonator electrodes and the deposited dielectric layer would be required. A non-optical method of determining the parallelism of quartz blanks was investigated. Air-gap frequency measurements yielded a qualitative measure of the parallelism of quartz blanks. Refinements of this technique should provide a more precise measurement of blanks having a thickness variation of less than half wavelength. Author