Compact Quasi-Isotropic Dielectric Resonator Antenna With Small Ground Plane

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Original languageEnglish
Article number6671377
Pages (from-to)577 - 585
Journal / PublicationIEEE Transactions on Antennas and Propagation
Issue number2
Online published20 Nov 2013
Publication statusPublished - Feb 2014


The quasi-isotropic dielectric resonator antenna (DRA) is investigated for the first time. It uses a small ground plane which also serves as an electric dipole. The electric dipole combines with the equivalent magnetic dipole of the DRA to generate quasi-isotropic fields. A choke (balun) is connected to the outer conductor of the coaxial cable to suppress stray radiation. ANSYS HFSS was used to simulate the antenna, and a prototype operating at 2.4-GHz WLAN band was fabricated to verify the simulation. Results show that the difference between the measured maximum and minimum radiation power densities is 5.6 dB over the entire pseudo spherical radiating surface. By using a narrower ground plane and a higher dielectric constant, the gain difference can be reduced to 3.4 dB, approaching the theoretical limit of 3 dB.

Research Area(s)

  • Dielectric resonator antenna (DRA), electric dipole, isotropic antenna, magnetic dipole, small ground plane