Recent developments in bandwidth improvement of dielectric resonator antennas

Abstract

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.

Miniaturized Conformal Arc Dielectric Resonator Antennas Using Dielectric and Metallic Loading

“…Type A: Thick slabs with moderate dielectric constant reduce the volume of DRAs by functioning as part of the resonant dielectric antenna and increasing the effective dielectric constant [1]- [4]. Since the dielectric loading and the original DRA are regarded as a whole, their overall dielectric constant is approximated by the static capacitance model [28].…”

“…The resonant frequency, quality factor, internal field distribution, and radiation characteristic of these intrinsic modes are determined by the physical structure of the dielectric block [1], [2]. Therefore, DRAs enjoy high design freedom and various antenna performance [1]- [4]. Among these resonant modes, the one with the lowest resonant frequency is known as the fundamental mode.…”

“…The location of the metal loading is determined by the internal field distribution of resonant modes [10], [11]. Based on the image theory, the size of DRAs is reduced to one half or even one quarter [4], [5]. To reduce metallic loss, dielectric loading is applied for the same purpose.…”

A review on circularly polarized antennas, trends and advances

“…The radius of the circular disc radiator is 10.5 mm. Till date, some review analysis has been performed on individual aspects of CP antennas, like circularly polarized dielectric resonator antennas [15, 16], fractal CP Antennas etc. But a comprehensive review of CP antennas as a whole, along with the vast domain of their applications is rare in the existing literature.…”

Asymmetric liquid flow control polarization reconfigurable cylindrical dielectric resonator antenna for wireless communications

“…It provides broad bandwidth (BW), low quality factor ( Q ‐factor), and high gain compared to traditional microstrip antennas 3,4 . A survey on the DRA modeling using numerical methods, applications, and development techniques are introduced in References 5‐7 . Different DR antenna designs with different feeding techniques for proper mode excitations are investigated in Reference 8.…”