Excitation of Higher Order Modes of Cylindrical Dielectric Resonator Antenna using Dual-slot feed

[摘要] Excitation of the higher order modes (HOM) of a cylindrical dielectric resonator antenna(DRA) of high relative permittivity, using dual feed scheme is investigated. The feed scheme uses a pair of narrow slots and is chosen on the basis of the field distribution of the desired DRA modes. Numerical studies using ANSYS HFSS show that the dual-feed excited a combination of two HOMs, which are identified as HEM21δand TM01δ. The mixed-up nature is further verified through studying the radiation pattern of the DRA which shows azimuthal asymmetry and low gain. It is suggested that if one of the HOM is suppressed, better antenna performance can be achieved.

[发布机构] Department of Electrical and Electronics Engineering, Birla Institute of Technology and Science (BITS), Rajasthan, Pilani, India^1

[关键词] Antenna performance;Azimuthal asymmetries;Cylindrical dielectric resonator antenna(DRA);Cylindrical dielectric resonator antennas;Field distribution;Higher-order modes;Narrow slot;Relative permittivity