ELECTRONICALLY TUNABLE MICROWAVE BANDPASS FILTER

Abstract

An equivalent circuit of two orthogonal striplines coupled by a ferrite (yttrium iron garnet) sphere is derived, using the scattering matrix method. This derivation shows that a nonreciprocal phase shifter can be represented by gyrator networks. Based on this analysis, a YIG bandpass filter, electronically tunable over a very broad frequency range (4:1), is designed by coupling two broadband 180-deg phase shift circuits with a small single crystal YIG sphere. The report also reviews some basic principles pertaining to filter considerations, analyzes the filter circuit of two orthogonal striplines coupled by a ferrite sphere, and synthesizes the equivalent filter circuit by a scattering matrix method. These results describe the operation of the filter circuit under various terminal excitations.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1967
Accession Number
AD0662215

Entities

People

  • Frank Reggia
  • Ting Hei Mak

Organizations

  • Harry Diamond Laboratories

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Bandpass Filters
  • Bandwidth
  • Dipole Moments
  • Equivalent Circuits
  • Frequency
  • Frequency Bands
  • Magnetic Dipoles
  • Magnetic Fields
  • Magnetic Properties
  • Materials
  • Military Research
  • Phase Shift
  • Phase Shift Circuits
  • Resonant Circuits
  • Resonant Frequency
  • Scattering
  • Transmission Lines

Fields of Study

  • Physics

Readers

  • Microwave Engineering.
  • Theoretical Analysis.

Technology Areas

  • Microelectronics