Radiation characteristic analysis of ridged horn by aperture port excitation

In this paper, radiation pattern of ridged horn and array with aperture port excitation are calculated based on surface integral equation method. According to equivalent theory, field distribution of the EM wave propagating in ridged waveguide on cross section of which is transformed to equivalent electrical dipoles and magnetic dipoles, then radiating electrical field by these dipoles as excitation, induced current on wall of horn is solved by MoM. Total field by these equivalent dipoles and induced current form pattern of a ridged horn. Results are compared to finite element-boundary integral method such as FEM-MoM.