Wideband Horizontally Polarized Omnidirectional Cylindrical Dielectric Resonator Antenna for Polarization-Reconfigurable Design

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

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Original languageEnglish
Journal / PublicationIEEE Transactions on Antennas and Propagation
Online published13 May 2021
Publication statusOnline published - 13 May 2021


A compact horizontally polarized omnidirectional cylindrical dielectric resonator antenna (DRA) excited in the TE011+δ mode is presented. It deploys a planar feed which comprises a cross-shaped feed line, four coupled strips, and four curved arms with end-shorted stubs. The TE011+δ mode of the DRA is excited by the curved arms. Its intrinsically narrow impedance bandwidth is enhanced by using the coupled strips, and the cross-polar field is suppressed by the end-shorted stubs. The antenna has a measured -10-dB impedance bandwidth of 18.1%, which is much wider than the conventional bandwidths of 4.5%-7.4%. Its cross-polar level is lower than the co-polar level by 15 dB. This basic DRA is used to design the first polarization-reconfigurable omnidirectional DRA with diodes. By controlling the states of the diodes, the DRA can be switched between the TE011+δ and TM01δ modes to obtain the horizontal and vertical polarizations, respectively. To verify the idea, a prototype was fabricated and tested. Reasonable agreement between the measured and simulated results is obtained. The measured impedance bandwidths of the TE011+δ and TM01δ modes are 16.8% (2.18–2.58 GHz) and 16.0% (2.25–2.64 GHz), respectively. The antenna has stable omnidirectional radiation patterns in both states.

Research Area(s)

  • Antenna feeds, Antenna radiation patterns, Antennas, Bandwidth, dielectric resonator antenna (DRA), Dielectric resonator antennas, glass antenna, Impedance, omnidirectional radiation pattern, Polarization reconfigurable, Reflection coefficient