Design of high‐permittivity rectangular dielectric resonator antenna

Abstract

In this article, a high‐permittivity rectangular dielectric resonator antenna is proposed. In this configuration, wideband operation is achieved by loading a rectangular dielectric resonator on the center of the rectangular ring slot. Dielectric resonators of three different thicknesses have been studied. In this configuration, slot acts as an effective radiator and the feeding structure of the dielectric resonator. The dual‐band resonances of the two radiators, i.e., slot and dielectric resonator are combined to extend the antenna bandwidth. The measured impedance bandwidth obtained is about 81.7%. The return loss, radiation pattern, and half power beam widths are measured and presented. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:1077–1079, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25927

Recent developments in bandwidth improvement of dielectric resonator antennas

“…During this review process it has been also found some papers related to bandwidth by highlighting permittivity in their title. Mainly the effect of high permittivity on impedance bandwidth is discussed here . Mongia et al, have reported a high permittivity rectangular DRA ( ε r = 100) to achieve 3% impedance bandwidth.…”

“…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…”

“…Huynh et al, have informed that, the impedance bandwidth could be maximized for a small relative permittivity that is greater than unity while radiation pattern degraded if the permittivity decreases. Wide band of 81.7% has been achieved by Madhuri et al, in a rectangular ring slot coupled high permittivity rectangular DR‐antenna. Avadanei et al, have proposed to excite high permittivity DR material in superior modes to obtain wide impedance bandwidth, which has been experimented in a rectangular slot fed cylindrical DRA.…”

Wideband low‐profile dual‐polarized dielectric patch antenna with metallic pins

“…Dielectric resonator antenna (DRA) has attracted wide attention due to its advantages of high radiation efficiency, low conductor loss, easy excitation and high design flexibility 1–7 . More importantly, various modes of a single DRA element can be excited for diverse radiation characteristics 7–11 .…”

Compact Double-P Slotted Inset-Fed Microstrip Patch Antenna on High Dielectric Substrate

“…A wide range of methods are reported in literatures for achieving reduced antenna size and obtaining more than one frequency band of operations. Some of the techniques involve using rectangular slotted patch [ 9 ], circular ring [ 10 ], defected ground plane [ 11 , 12 ], metamaterials [ 13 , 14 ], electromagnetic band-gap [ 15 ], high dielectric substrate [ 16 , 17 ], magnetodielectric material [ 18 ], fractal shape [ 19 , 20 ], split ring [ 21 , 22 ], various feeding techniques [ 23 – 25 ], stacked arrangement [ 26 , 27 ], and optimization technique like genetic algorithms [ 28 , 29 ]. None the less, still there is room for further development of techniques to enhance the design simplicity, flexibility of operations, and tunable functionality of multifrequency besides maintaining the desired antenna properties for the implementation of the compact wireless device.…”