Modeling cavity-backed apertures conformal to prolate spheroids using the finite element-boundary integral technique

The hybrid finite element-boundary integral (FE-BI) method is used to model the effects of curvature variation on the resonant input impedance of cavity-backed aperture antennas recessed in the surfaces of prolate spheroids of varying dimensions. In order to assess the validity of these results, the resonant input impedance of the conformal antenna, for the limiting cases of zero axial and azimuthal curvatures, are compared with the resonant input impedances of cavity-backed aperture antennas conformal to cylindrical and planar surfaces, respectively. Results for the input impedance associated with a patch antenna mounted in a cavity flush with the surface of a prolate spheroid is presented.