Exploratory Development of VHF (Very High Frequency) Quartz Crystal Resonators.
Abstract
Resonators have been fabricated for 70 MHz to 1.6 GHz operation using wet chemical etching of AT-cut quartz wafers. Measured Q's close to estimated material values were obtained for first and third overtone resonators. Best performance for very high frequency operation was obtained using small diameter electrodes, polished blanks and vacuum enclosures. Natural quartz which has a lower incidence of etch channels and pits than cultured quartz was used for most of the resonators fabricated. Elimination of these defects which contribute to failure of thin etched wafers was also achieved in cultured quartz by sweeping. Swept material was used for 100 MHz resonators with good results. A breadboard circuit operable to 150 MHz was built to demonstrate the feasibility of using these resonators in oscillators. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1986
- Accession Number
- ADA172879
Entities
People
- John R. Hunt
- Robert C. Smythe