THE STABILITY AND Q-FACTOR OF QUARTZ-CRYSTALS EXCITED BY THE PARALLEL FIELD TECHNIQUE

Abstract

The development of parallel field excited crystals was studied with the e of obtain ing quartz crystal resonators having high Q and low aging. The electrical parameters of parallel field excited crystals and their variation as a function of the plating pattern were investigated. Quality factors of six million were obtained with a gap of about 1mm. Parallel field excited crystals with wide gap showed Q's up to ten mil lion. This led to the conclusion that the main factor limiting Q is the damping due to the metal film deposited on the surface of the crystals, especially in the center. Series of measurements were carried out with the normal field excitation using annular electrodes, which is the reversed method as compared to conventional plating. An increase of the central unplated area is followed by an increase of the Q-value, which confirmed the above conclusion. An attempt was made toward the elimination of the weak points of both de scribed methods, i.e. too high inductance in case of the parallel field and too high capacity in case of the normal field excitation using annular electrodes.

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Document Details

Document Type
Technical Report
Publication Date
Apr 30, 1963
Accession Number
AD0410296

Entities

Organizations

  • Paris Observatory, PSL University

Tags

Communities of Interest

  • Advanced Electronics
  • Human Systems

DTIC Thesaurus Topics

  • Abstracts
  • Contracts
  • Electrodes
  • Excitation
  • Films
  • Geometry
  • Government Procurement
  • Inductance
  • Measurement
  • Metal Films
  • Observatories
  • Patent Applications
  • Patents
  • Phase
  • Plastic Explosives
  • Q Factor
  • Resonators

Readers

  • Microwave Engineering.
  • Plasma Physics / Magnetohydrodynamics