Radiation modes investigation of Huygens source type antenna using spherical wave expansion

Spherical wave expansion (SWE) is usually used in numerous applications or analysis such as antenna measurement and physical limitations of electrically small antennas. In this paper, spherical wave expansion is used as tool to analyze the far-field radiation properties of a low profile dual-polarized wideband magneto-electric dipole antenna. The analysis demonstrates that the proposed magneto-electric antenna presents the same behavior as a generalized Huygens source with identical contribution of transverse electric (TE) and transverse magnetic (TM) modes on a wide bandwidth.