Bifrequency behaviour and bandwidth enhancement of a dielectric resonator antenna

Abstract

In this paper, we present a new configuration which enhances the impedance bandwidth (we obtain an increase of 80%) and exhibits dual‐frequency operation. The characteristics of the new structure are measured and discussed. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 432–434, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20327

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…”

“…During this reviewing process, it has been noticed that, the researchers have reported bandwidth improvement by means of DR shape modification, incorporation of EBG/metamaterial, or fractal …”

“…Lapierre et al, have achieved 74% impedance bandwidth by exciting an annular ring DR with a monopole antenna in TM 01δ . Nannini et al, have observed that stacking and air intrusion improved the bandwidth of a slot fed CDRA. Guo et al, have reported something more for the bandwidth enhancement and found stacked annular CDRA operating for 42% impedance BW while 18% for only stacked one.…”

“…Next to DRA shape, the coupling mechanism plays an important role in controlling performance characteristics of DRA. This technique is also known as bandwidth improvement by means of impedance matching and this can be established either by modification in feeding line or slot types …”