Double annular‐ring dielectric resonator antenna for ultra‐wideband application

Abstract

A new dielectric resonator antenna (DRA) is proposed in this article for ultra‐wideband (UWB) application. A larger annular‐ring DRA is placed concentrically outside a smaller one to form a double annular‐ring DRA. The antenna is operating at the end‐fire mode. The effects of antenna parameters, such as the radiuses and heights of the dielectric resonators as well as the probe length are investigated. The proposed double annular‐ring DRA can offer an impedance bandwidth up to 3–11.2 GHz for a return loss less than −10 dB. The radiation patterns are stable in the passband. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 362–366, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22140

Recent developments in bandwidth improvement of dielectric resonator antennas

“…Broadly, these approaches can be divided into four categories; firstly, according to the antenna geometry (DR shape/fractal/EBG/metamaterial), secondly, the coupling mechanism (feeding type/aperture shape), thirdly, the DR permittivity, and lastly, according to the excitation of specific mode. From ease of readers' point of view, these techniques are discussed separately for single‐band, dual‐band, and multi‐band,, respectively. Moreover, some other characteristics say radiation/notch…”

Ultra-Wideband Antenna and Design

“…This design can be used to retrofit existing monopole antennas: by introducing an appropriate DRA, the original narrow-band monopole can be transformed to achieve an UWB performance, with bandwidth ratio of 2.6:1 (6.5~16.8 GHz). To enhance the antenna bandwidth further, Ruan et al [55] proposed a double annular ring DR with different permittivity, which achieves an impedance bandwidth ratio of 3.7:1 (1.8~6.9 GHz). Later, Jazi et al [56] proposed a skirt monopole antenna used to excite an inverted conical-ring-shape dielectric resonator.…”

Monopole antenna loaded by stacked annular ring dielectric resonators for ultrawide bandwidth

“…An extra resonce is obtained by the excitation of the TM 01δ mode of the ring DRA . A fractional bandwidth of 110% was achieved subsequently by several monopole/DRA geometries . Recently, an enhancement in the bandwidth has been reported by stacking DRAs of different shapes .…”