RESEARCH INTO NEW APPROACHES FOR VHF FILTER CRYSTALS.

Abstract

Experiments with rectangular electrodes on 10 Mc AT-cut quartz wafers have verified the dependence, predicted by energy-trapping theory, of fundamental and inharmonic overtone mode frequencies on resonator design parameters. From these, a generalization of the Bechmann criterion on maximum electrode dimensions has been proposed to include crystallographic orientation and the effect of electrode massloading. Feasibility for multi-electrode filter crystals has been demonstrated with the fabrication of two samples with 4 dot-resonators per wafer. Each set of dot-resonators was electrically connected in parallel to form the equivalent of an oversized single resonator, with resultant motional characteristics adding in the predicted fashion. This technique should allow an extension of the range of motional characteristics available in VHF filter crystals and in turn should lead to greater flexibility in filter network synthesis. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 19, 1964
Accession Number
AD0600118

Entities

People

  • D. J. Koneval
  • Damian Curran

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Electrodes
  • Fabrication
  • Frequency
  • Material Forming Processes
  • Materials Processing
  • Orientation (Direction)
  • Resilience
  • Resonators

Readers

  • Microwave Engineering.
  • Structural Dynamics.