MICROWAVE APPLICATION OF FERRITES. PART II. EQUIVALENT CIRCUIT OF THE FERRIMAGNETIC AMPLIFIER. EXPERIMENTAL PROGRAM. GROWTH OF YTTRIUM IRON GARNETS

Abstract

The equivalent circuit of a ferrimagnetic amplifier was derived from first principles. The result is obtained by a perturbational procedure and applies directly to electromagnetic operation of the amplifier only. It can, however, also be used for the modified semi-static operation. The experimental program was directed toward reduction of pump power requirements in the operation of parametric amplifiers using single yttrium iron garnet (YIG) crystals as the active element. This aim was achieved only partially. Pump power levels were reduced to about 2 watts with some amplifier configurations. This is somewhat short of the goal to reduce threshold levels to powers below 1 watt which might bring this type of amplifier within a practical range. Growing methods and results are presented for single crystal yttrium-iron garnet crystals. (Author)

Document Details

Document Type
Technical Report
Publication Date
Aug 16, 1961
Accession Number
AD0263394

Entities

People

  • Harry Gruenberg
  • Volker Weiss

Organizations

  • Syracuse University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amplifiers
  • Circuits
  • Crystals
  • Elements
  • Equivalent Circuits
  • Garnet
  • Parametric Amplifiers
  • Power Levels
  • Single Crystals
  • Yttrium
  • Yttrium Iron Garnet

Fields of Study

  • Physics

Readers

  • Microwave Engineering.
  • Plasma Physics / Magnetohydrodynamics