Non-uniform field modeling of ferrite-loaded cavity-backed slot antennas

The input impedance predicted by the modified formulation presented in this paper were compared against measurements as well as data predicted by the formulation used in [Polycarpou et al., 1998]. The comparison showed that the effect of the non-uniformities in the applied magnetic field is to broaden the input impedance response vs. frequency. It was observed that such broadening resulted in predicted curves having better agreement with the measured curves. As a result, such observation validates the initial premise that the non-uniformities of the applied magnetic field have to be taken into account if a most accurate analysis of ferrite-loaded CBS antennas is to be achieved.