A ferrite single annular-ring microstrip antenna with two
feed probes was proposed and simulation results were
presented. Simulated S-parameters show that a better
separation between the feed probed must be achieved.
Manufactured ferrite 1-CPA and ferrite 1-ARA were
characterized by S-parameter measurements and radiation
patterns. Permeability, permittivity, and associated loss tangent
values of manufactured substrate material deviated from the
parameters used for FEKO simulations. Thus, expected Sparameters
and radiation patterns were not achieved. But
FEKO simulations using measured permeability, permittivity,
and loss tangent values agree with measurements, thus showing
that if the substrate parameters were exactly the same as those
used for initial simulations, then measurement results would
show expected values.