Omnidirectional Circularly Polarized Dielectric Resonator Antenna for 5.2-GHz WLAN Applications

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Abstract
The rectangular dielectric resonator antenna (RDRA) is presented to generate linearly polarized (LP) with omnidirectional radiation patterns. The proposed omnidirectional LP DRA is fed centrally by a coaxial probe and offers an impedance bandwidth of 130 MHz between 5.15 and 5.35 GHz for dB, which can be useful for 5.2-GHz WLAN applications. It is noted that by introducing several inclined slits to the diagonal and sidewalls of the RDR and also deducting a rectangular part of the top wall of the LP RDRA, degeneracy mode is excited to generate the circularly polarized (CP) fields. The proposed omnidirectional CP DRA with axial-ratio (AR) bandwidth of 210 MHz was designed for WLAN (5.15-5.35 GHz) applications. A parametric study is presented. The proposed CP DRA is built, and the characteristics of the antenna are measured. Very good agreement between numerical and measured results is obtained.
Funding Information
  • Ministry of Higher Education (MOE)
  • Research Management Centre (RMC)
  • Wireless Communication Center (WCC) Universiti Teknologi Malaysia (UTM) (04H36, 08J81)

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