Accession Number : ADP002485

Title :   Chemically Polished High Frequency Resonators,

Corporate Author : PIEZO CRYSTAL CO CARLISLE PA

Personal Author(s) : Hanson,W. P.

Report Date : 1983

Pagination or Media Count : 4

Abstract : The upper frequency limit of quartz resonators is determined by the physical properties of quartz and restrictions imposed by processing techniques. More often than not, the processing limitations are reached long before the physical limitations. Mechanical polishing has been used successfully for many years. The frequency limits determined by the mechanical polishing process have restricted the use of quartz resonators to frequencies less than 250 MHz. Chemical polishing is an etching process which removes the quartz from a blank in a well defined manner. The upper frequency limit of chemically polished resonators is much higher than mechanically polished resonators. Chemically polished 'SC' resonators have surface topographies similar to highly polished resonators manufactured by conventional means. Currently, chemically polished 'SC' resonators can operate up to the seventh overtone, higher overtones may be achievable when a better quality quartz is used as a source material. Frequencies in the GHz range are thus manufacturable using chemical polishing.

Descriptors :   *Quartz resonators, *Frequency response, *Polishing, Processing, Chemical cleaning, Polishes, High frequency, Etching

Distribution Statement : APPROVED FOR PUBLIC RELEASE