The use of computer-predicted performance in the design of a three-port H-plane waveguide circulator with central ferrite post
Castillo, Joseph B
Davis, L. E.
Master of Science
An approximate evaluation procedure to predict the performance of a circulator is justified. The scattering matrix description of a circulator is developed. Based on the theory by Davies, the scattering matrix elements are developed from a field theory analysis of the junction. A computer program which incorporates this theory is described. For an input of ferrite parameters and internal biasing magnetic field, a simulated swept-frequency graph of circulator performance is obtained. A three port H-plane waveguide junction circulator with a central ferrite post is tested in the laboratory, agreeing well with the predicted performance. Possibilities for further work are stated.