LAUSR

Through symmetry breaking, an electric dipole moment is generated out of the fundamental magnetic dipole mode of dielectric resonator antennas (DRAs). Unidirectional radiation is then achieved based on the concept of complementary antennas by disturbing the modal field distribution. The eigenmode method and Cartesian multipole analysis are utilized to analyze the modified DRA and quantitatively monitor the amplitude and phase of the dipole moments. The characteristic mode analysis and scattering spectrum method are also applied for further validation. It is found that the unidirectional radiation pattern is obtained by a modified eigenmode instead of the superposition of two adjacent ones. Based on the proposed mechanism, several different design examples are presented. High front-to-back ratios (FBRs) are observed.