TUNABLE DIELECTRIC IMAGE GUIDE FILTER FROM 26.5 TO 40.0 GHZ

A dielectric image guide loaded with a self biasing ferrite was design ed and tested from 26.5 to 40 GHz. An M - type hexagonal ferrite was u sed with its c - axis transverse to the direction of propagation. The electromagnetic scattering parameters of the device were measured for the magnetic field, applied along the c - axis. We have employed two d ifferent methods to analyze the guided structure - a) transmission lin e circuit model and b) perturbation theory. General agreement was foun d between the transmission line analysis and the experimental results.