Electromagnetic scattering from the probe-fed hemispherical dielectric resonator antenna

In this paper, we study the scattering problem of the probe-fed hemispherical dielectric resonator (DR) antenna. The mode matching method (MMM) as well as the method of moments (MoM) are used in this paper. The former is used to calculate the DR antenna's scattered field whereas the latter is used to determine the induced current flowing on the probe's surface, The field radiated by the current in presence of the grounded DR is found using the Green's function technique. Finally, the fields obtained above are added together to give the total scattered field from the DR antenna. The radar cross section (RCS) calculated using this method converges to the Mie results as the probe length L/spl rarr/0. Moreover, when the dielectric constant of the DR approaches unity, the calculated radar cross-sections (RCSs) agree very well with that of a wire scatterer available in the literature. In this paper, the effects of the probe's length and the probe's impedance loading on the RCS are studied.