Omnidirectional Dielectric Resonator Antenna with a Planar Feed for Circular Polarization Diversity Design

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

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)1189-1197
Journal / PublicationIEEE Transactions on Antennas and Propagation
Volume66
Issue number3
Online published17 Jan 2018
Publication statusPublished - Mar 2018

Abstract

The cylindrical dielectric resonator (DR) antenna (DRA) is excited in its omnidirectional TM 011δ mode by a planar shorted microstrip cross. With this nonintrusive feed, the DRA can be fabricated without the need of drilling a hole in the DR as required in the probe feed method. This DRA is applied to the first omnidirectional circularly polarized (CP) diversity DRA. To generate omnidirectional CP fields, the TM 011δ and TE 011+δ modes are excited simultaneously. The TE011+δ mode is excited by four microstrip arcs. They provide a pair of equivalent magnetic dipoles that generate fields that are orthogonal to those of the TM 011δ mode. Omnidirectional CP fields can be obtained when the (orthogonal) fields of the TM 011δ and TE011+δ modes are equal in amplitude but in phase quadrature. In our two-port CP diversity design, phase differences of +90° and-90° are obtained in ports 1 and 2 to generate right- A nd left-hand CP fields, respectively. Prototypes at 2.4 GHz were designed, fabricated, and measured for WLAN applications. The S-parameters, radiation patterns, antenna gains, and efficiencies are studied. For the diversity design, the axial ratio, envelope correlation coefficient, and mean effective gain are also obtained. The measured and simulation results are in reasonable agreement.

Research Area(s)

  • Circular polarization, dielectric resonator (DR) antenna, diversity, omnidirectional antenna