Computer-Aided Design of 3-Port Waveguide Circulators.
Abstract
A 3-port H-plane waveguide junction loaded coaxially with various combinations of dielectric and magnetized ferrite cylinders has been analyzed. Using the first 3 modes (n = 0, + or - 1) in the junction, computer programs have been written to evaluate their performance over the waveguide bandwidth. Qualitatively, measured and predicted behavior agree well. For a homogeneous ferrite rod the circulation frequency, f sub o increases as 4piM sub s and internal static field increase and permittivity decreases. These opposing effects also occur when 4piM sub s and epsilon sub r are radially inhomogeneous, but the magnitudes of the effects are functions of position. Reduction of ferrite volume produces an improvement in performance in some structures, and high power applications are suggested. With a thin conducting pin down the center of the ferrite, bandwidths of 40-50% are predicted in X-, C- and S-bands and details of these structures are given. Central pin tolerances are discussed. In some structures without the pin, higher order modes apparently cause discrepancies between theory and experiment, and these are briefly discussed. Complete details are given of two of the computer programs, and the problem of automatic optimization of design is briefly discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1968
- Accession Number
- AD0843644
Entities
People
- J. B. Castillo
- L. E. Davis
Organizations
- Rice University