Omnidirectional Cylindrical Dielectric Resonator Antenna With Dual Polarization

Abstract

Abstract-This letter proposes an annular cylindrical dielectric resonator antenna (DRA) with two-port diversity realizing simultaneously omnidirectional horizontally and vertically polarized radiation patterns with low cross coupling. The horizontally and vertically polarized radiation patterns are achieved by exciting the orthogonal TE and TM modes in a single cylindrical dielectric resonator (DR). Due to the high -factor of the TE mode, an air gap and multiple feeding lines are introduced to increase the impedance bandwidth. The proposed antenna provides an impedance bandwidth of 19.1% in the vertically polarized mode and an overlapping bandwidth of 7.4% in the horizontally polarized mode, with the overlapping band ranging from 3.78 to 4.07 GHz. Antenna diversity and multiple-input-multiple-output (MIMO) performance are examined in terms of envelope correlation coefficient and mean effective gain.

A bowtie-shaped MIMO dielectric resonator antenna for WLAN applications

“…a coupled aperture for port1 and a coaxial probe for port2, are used to excite TM 22 and TE 21 modes respectively, in the proposed antenna. As compared to the antennas in [8,9,10,11], the proposed bowtie-shaped DRA outperforms in terms of high isolation (25 dB), compact in size, and relatively low ECC (0.00156). Moreover, the proposed design relies on a simple structure and feeding mechanism that is easy to fabricate.…”

“…In [5,6,7] singly-fed bowtie-shaped DRAs are presented exhibiting excellent radiation and bandwidth characteristics, however, these antennas are not targeted for MIMO applications and hence MIMO performance parameters are not reported in these works. In [8] a cylindrical DRA with dual polarization was designed by exciting the TE 01 and TM 01 modes in a single annular cylindrical DRA where two groups of 4 arc-shaped microstrip lines of various widths and lengths were used to excite the TE 01 mode and a metal cap was placed on top of the probe to make the resonant frequency of TM 01 modes and the TE 01 mode equal. This antenna however has a bulky feeding mechanism and isolation up to 15 dB.…”

“…The antenna presents isolation about 17 dB. Antennas in [8,9,10,11] either have complicated feeds or have complex structures, low isolation and may have fabrication issues.…”

Design of a Dual-Band Mimo Dielectric Resonator Antenna With Pattern Diversity for Wimax and Wlan Applications

“…MEG can be calculated using Equation (4). For a similar power level at each branch, the power ratio k must be less than 3 dB [14].…”

Compact Dielectric Resonator Antenna With Band-Notched Characteristics for Ultra-Wideband Applications

“…The interest in dielectric resonator antennas (DRAs) for a variety of wireless communications systems has grown in the last few years [1][2][3][4][5][6][7][8]. Dielectric resonators (DRs) are fabricated from low-loss dielectric materials, for which the resonant frequency is predominantly a function of size, shape and permittivity.…”