Hemispherical dielectric resonator antenna with a concentric conductor

In this article, cylindrical segmented dielectric resonator antenna (CDRA) is proposed for ISM band applications. To obtain the proposed antenna, three different (120°, 60°, and 30°) segments of different cylindrical radius r1, r2, and r3 with stacked angular displacement are used for circular polarization with wideband frequency response. Quadrature phase shift of orthogonal field are observed when segment of cylinder is stacked with specific angular displacement. Various higher order modes are investigated. The simulated and measured impedance bandwidth of the proposed antenna is 90% (3.3 GHz‐8.7 GHz) and 83.4% (3.5 GHz‐8.5 GHz) respectively and the simulated and measured axial ratio bandwidth is 53.8% (3.8 GHz‐6.6 GHz) and 58.5% (3.5 GHz‐6.4 GHz), respectively. Proposed antenna attains 7.1 dBi measured peak gain at 8.5 GHz with more than 80% radiation efficiency in the frequency band. The fabricated prototype is experimentally measured and its results are found to be commensurable with the simulation results.

Section: Antenna Design Approachmentioning

confidence: 99%

“…Because of the absence of metal in DRA, the performance of the DRA does not degrade at higher frequency range. 1,2 Various DRA geometries include rectangular, cylindrical, and hemispherical shapes. Circular polarized antenna is a key requirement of modern communication system.…”

Section: Introductionmentioning

confidence: 99%

Wideband circular polarized cylindrical segmented dielectric resonator antenna for ISM band applications

Chauhan

Mukherjee

2020

“…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…”

Section: Dra Research On Bandwidthmentioning

confidence: 99%

“…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 …”

Section: Dra Research On Bandwidthmentioning

confidence: 99%

Recent developments in bandwidth improvement of dielectric resonator antennas

Dash

Khan

2019

This article shows a compressed chronological overview of dielectric resonator antennas (DRAs) emphasizing the developments targeting to bandwidth performance characteristics in last three and half decades. The research articles available in open literature give strong information about the innovation and rapid developments of DRAs since 1980s. The sole intention of this review article is to, (a) highlight the novel researchers and to analyze their effective and innovative research carried out on DRA for the furtherance of its performance in terms of only bandwidth and bandwidth with other characteristics, (b) give a practical prediction of future of DRA as per the past and current state-of-art condition, and (c) provide a conceptual support to the antenna modelers for further innovations as well as miniaturization of the existing ones. In addition some of the significant observations made during the review can be noted as follows; (a) hybrid shape DRAs with Sierpinski and Minkowski fractal DRAs seems comfortable in obtaining wideband as well as multiband, (b) combination of multiple resonant modes (preferably lower modes) can lead to wider impedance bandwidth, (c) at proper matching wider patch with slotted dielectric resonator can exhibit better bandwidth.

“…Dielectric resonator antennas (DRAs) became very popular in the field of defense, RADAR, and millimeter wave applications due to its various advantages, such as wide bandwidth, high radiation efficiency, and ease of excitation. 1,2 The restriction of the microstrip antennas is overcome by the DRAs for wideband wireless applications. 3 The conduction loss of DRA is about to zero.…”

Section: Introductionmentioning

confidence: 99%

Dielectric resonator array antenna for triple band WLAN applications with enhanced gain

Chakraborty

Biswas

Maity

et al. 2018

An H‐shaped dielectric resonator array antenna is presented for wideband applications. The proposed antenna is excited by slot feed mechanism and investigated experimentally. The antenna covers the frequency ranges from 1.41 to 2.59 GHz, and 4.73 to 6.06 GHz with the corresponding impedance bandwidth of 59% and 24.65%, respectively. The simulation results fulfill the bandwidth requirements of IEEE 802.11a/b/g (2.4‐2.484 GHz/5.15‐5.35 GHz/5.725‐5.825 GHz) for Wireless local area network (WLAN) applications. The proposed antenna has simple structure, easy to fabricate and its measured radiation pattern shows a reliable performance in the desired operating bands.