INVESTIGATION OF MICROWAVE DIELECTRIC-RESONATOR FILTERS

Abstract

Waveguide band-stop filters using dielectric resonators are considered. Two basic orientations, transverse and axial, of a dielectric resonator in a TE10-mode rectangular waveguide are analyzed. Formulas for external Q are derived in both cases. The experimental response of a three resonator band-stop filter is shown to agree well with the theoretically anticipated performance. Various configurations of dielectric resonators in waveguide that yield directional filter performance are described. Pairs of resonators operating in their fundamental mode are used as well as a single resonator operating in its second mode of resonance. Formulas are derived for several cases. Measured resonant frequency curves are presented for the first three modes of a disk as a function of length-to-diameter ratio and favorable regions of L/D yielding good mode separation are found for the cases of the first and second modes. Data showing the effect of metal-wall proximity on unloaded Q and resonant frequency are presented for an axially oriented dielectric disk in square and circular tubes below cut-off.

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Document Details

Document Type
Technical Report
Publication Date
Jul 28, 1965
Accession Number
AD0474147

Entities

People

  • Eugene N. Torgow
  • Seymour B. Cohn

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Circuits
  • Dipole Moments
  • Dual Mode
  • Electronics Laboratories
  • Energy Bands
  • Equivalent Circuits
  • Filters
  • Frequency
  • Geometry
  • Insertion Loss
  • Magnetic Dipoles
  • Microwave Filters
  • Orientation (Direction)
  • Resonance
  • Resonant Frequency
  • Transmission Lines
  • Waveguide Filters

Fields of Study

  • Engineering
  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Microwave Engineering.