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Omnidirectional Linearly and Circularly Polarized Rectangular Dielectric Resonator Antennas | IEEE Journals & Magazine | IEEE Xplore

Omnidirectional Linearly and Circularly Polarized Rectangular Dielectric Resonator Antennas


Abstract:

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 D...Show More

Abstract:

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.
Published in: IEEE Transactions on Antennas and Propagation ( Volume: 60, Issue: 2, February 2012)
Page(s): 751 - 759
Date of Publication: 21 October 2011

ISSN Information:


I. Introduction

In THE past two decades, the dielectric resonator antenna (DRA) has received tremendous attention due to a number of attractive features such as its small size, light weight, low loss, wide bandwidth, and ease of excitation [1]–[4]. The shape of the DRA can be hemispherical, cylindrical, or rectangular. Among these shapes, the rectangular one has the largest number of design parameters (width, length, and height), facilitating the antenna design. Okaya and Barash [5] divided the modes of the rectangular DRA into two categories, namely the and modes. The fundamental mode has been investigated by different researchers extensively [6]–[9]. It produces a radiation pattern which is similar to that of a magnetic dipole, with the strongest radiation found in the boresight (broadside) direction. It is known that the fundamental omnidirectional modes of the hemispherical and cylindrical DRAs are the [10] and [11], [12] modes, respectively, with their mode indices referring to field variations along the spherical/cylindrical coordinate variables. Both of the modes are excited by a centrally fed probe and radiate like an electric monopole. However, little or no information of the analogous mode was found for the rectangular DRA. In this paper, a rectangular DRA with a square cross section is operated in the mode for the first time. It was found that its radiation pattern is omnidirectional in the horizontal plane as similar to that of an electric monopole.

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