Simple method for analyzing slot antennas on thick dielectric substrate

Analysis of active antennas is becoming increasingly important. Slot antennas are frequently used as active antennas integrated with converters or transmitters-oscillators. In that case printed slots are usually fed by coplanar waveguides (CPW) on a substrate lens, that is, very thick dielectric substrate. So far, the characteristics of slot antennas on thick (half-space) dielectric material have been evaluated using the space domain integral equation (SDIE). The present paper introduces a new, very simple and exact method for analysing slot antennas on half-space material. Complementary-duality was used to transform the slot on the half-space dielectric material to a wire dipole embedded in magnetic material. Results obtained are almost identical with those obtained with SDIE.