Accession Number : AD0829886

Title :   VHF FILTER CRYSTAL RESEARCH.

Descriptive Note : Quarterly rept. no. 3, 16 Jun-15 Oct 67,

Corporate Author : CLEVITE CORP CLEVELAND OH ELECTRONIC RESEARCH DIV

Personal Author(s) : Koneval, D. J. ; Sliker, T. R.

Report Date : APR 1968

Pagination or Media Count : 53

Abstract : The investigation of the effect of dielectric tuning layers of evaporated SiO sub x on the Q sub m of AT-cut quartz resonators was completed. The resonant frequency of a 10 MHz fundamental mode resonator was lowered 826 kHz (8.4%) in increments of 20 kHz. In so doing, the Q sub m decreased from 86,300 to 29,200. In addition, the Q sub m displayed a cyclic variation as the frequency was lowered. The resonant frequency of a 30 MHz 3rd harmonic mode resonator was lowered 1,351 kHz (4.5%) in steps of about 30 kHz. The Q sub m of this unit decreased in a continuous manner from an initial value of 92,300 to a Q sub m of 51,300. When appropriately normalized, the data of Q sub m versus the decrease in resonant frequency for fundamental, third and fifth harmonic mode resonators were in agreement. (Author)

Descriptors :   (*QUARTZ RESONATORS, DIELECTRIC PROPERTIES), CADMIUM SULFIDES, SINGLE CRYSTALS, TEMPERATURE, VERY HIGH FREQUENCY, RESONANT FREQUENCY, THICKNESS, RESPONSE, SPECIFICATIONS, VACUUM APPARATUS, VAPOR PLATING, TABLES(DATA).

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE