Pattern-Diversity Cylindrical Dielectric Resonator Antenna Using Fundamental Modes of Different Mode Families

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

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Author(s)

Detail(s)

Original languageEnglish
Number of pages11
Journal / PublicationIEEE Transactions on Antennas and Propagation
Early online date19 Jun 2019
Publication statusE-pub ahead of print - 19 Jun 2019

Abstract

For the first time, a pattern-diversity cylindrical dielectric resonator (DR) antenna (DRA) is designed using the fundamental HEM11δ and TM01δ modes of the HEM and TM mode families, respectively. It makes use of the fact that at the center of the DR, the E-field of the HEM11δ mode is weakest but that of the TM01δ mode is strongest. Therefore, increasing the dielectric constant around the central DR region can lower the resonant frequency of the TM01δ mode with no virtual effects on the HEM11δ mode. Using this approach, the frequencies of the HEM11δ and TM01δ modes can be made equal to obtain a pattern-diversity antenna. A cylindrical DRA centrally loaded by a dielectric with a higher dielectric constant is used to realize this idea. Its HEM11δ and TM01δ modes are excited by a rectangular cross slot and an axial coaxial probe, respectively. To demonstrate the idea, a two-port diversity antenna fabricated with two different transparent materials was designed for 2.4-GHz WLAN applications. It is found that the two ports of the pattern-diversity DRA have a measured overlapping impedance bandwidth of 23.4%, with an envelope correlation coefficient of lower than 0.007 and a mean-effective-gain ratio lower than 0.1 dB.

Research Area(s)

  • Dielectric resonator antenna (DRA), diversity antenna, envelope correlation coefficient (ECC), fundamental mode, mean effective gain (MEG), pattern diversity