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Omnidirectional Linearly and Circularly Polarized Rectangular Dielectric Resonator Antennas

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3 Author(s)
Yong Mei Pan ; Dept. of Electron. Eng., City Univ. of Hong Kong, Hong Kong, China ; Kwok Wa Leung ; Kai Lu

The rectangular dielectric resonator antenna (DRA) centrally fed by a probe is investigated. Its operating mode is analogous to the TM011 mode of a cylindrical DRA. The DRA radiates like an electric monopole, generating omnidirectional linearly polarized (LP) fields. Based on this LP design, a novel omnidirectional circularly polarized (CP) DRA is studied for the first time. Slots are introduced to the sidewalls of the DRA, exciting a degenerate mode for the generation of CP fields. To demonstrate the idea, an omnidirectional CP DRA was designed for WLAN (2.4-2.48 GHz) applications. The reflection coefficient, axial ratio (AR), radiation pattern, and antenna gain are studied, and reasonable agreement between the measured and simulated results is observed.

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Antennas and Propagation, IEEE Transactions on  (Volume:60 ,  Issue: 2 )