Accession Number : AD0818638

Title :   VHF FILTER CRYSTAL RESEARCH.

Descriptive Note : Quarterly rept. no. 1, 16 Jan-15 Apr 67,

Corporate Author : CLEVITE CORP CLEVELAND OH ELECTRONIC RESEARCH DIV

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

Report Date : AUG 1967

Pagination or Media Count : 23

Abstract : The resonant frequency of a 20 MHz AT-cut fundamental mode resonator was lowered, in 20 kHz increments, a total of 400 kHz (2%) by depositing SiOx. The Qm of the fundamental, third, and fifth harmonic modes was determined as a function of the decrease in the resonant mode frequencies. These preliminary data indicate that dielectric tuning initially has little or no effect on resonator Qm. As the resonant frequency is further lowered, however, the Qm eventually begins to decrease linearly with the frequency. The latter appears to be a result of excessive mass loading of the entire resonator structure. Initial date were obtained on the effect of air loading on the Qm of fundamental, third, and fifth harmonic mode resonators. Measurement techniques are discussed and experimental data are presented to indicate the accuracy of the transmission line method in determinations of the resonant resistance of VHF crystals (10-100 MHz) in a vacuum system. The CdS-quartz composite resonator is discussed briefly. (Author)

Descriptors :   (*CRYSTAL FILTERS, VERY HIGH FREQUENCY), (*QUARTZ RESONATORS, TUNING DEVICES), DIELECTRIC PROPERTIES, DEPOSITION, SILICON COMPOUNDS, TRANSMISSION LINES, CADMIUM SULFIDES, SINGLE CRYSTALS, VACUUM APPARATUS, MONOXIDES, RESONANT FREQUENCY, TEMPERATURE.

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE