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Proceedings ArticleDOI

Monopole-type dielectric resonator antenna with improved bandwidth characteristics

TL;DR: In this paper, a new generation ultra wideband hybrid variant which resembles a ''mushroom'' has been explored, and the proposed structure shows nearly 137% impedance bandwidth, the largest value that could be achieved so far.
Abstract: A new generation ultra-wideband hybrid variant which resembles a `mushroom' has been explored. The proposed structure shows nearly 137% impedance bandwidth, the largest value that could be achieved so far. A uniform monopole type radiation with 10 dBi peak gain has been examined.
Citations
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Journal ArticleDOI
TL;DR: In this paper, the effect of loading a monopole-fed cylindrical ring dielectric resonator antenna using a metallic cap and metallic sleeve on its top and outer surface, respectively, is investigated.
Abstract: This study investigates the effect of loading a monopole-fed cylindrical ring dielectric resonator antenna using a metallic cap and metallic sleeve on its top and outer surface, respectively. The proposed design exhibits a considerable shift of its upper cut-off frequency (from 13.8 to 20.5 GHz for top loading and 8.2 to 15.9 GHz for outer-surface loading) with varying inner radii (height) of the metallic cap (sleeve), thereby providing the bandwidth (BW) controllability. Fabricated prototypes were measured and compared with simulations and good agreement was obtained. The measured return loss exhibits the desired BW control without affecting the peak gain and radiation pattern of the antenna, which is also confirmed by the measured radiation patterns. The proposed concept can be used to reconfigure the BW of the antenna according to the user's requirements and improve signal-to-noise ratio by rejecting unwanted frequency bands without employing any additional filter section.

12 citations

Proceedings ArticleDOI
01 Dec 2018
TL;DR: In this paper, a novel approach has been implemented to improve the performance of monopole loaded hybrid dielectric resonator antennas (DRAs), which can be used as an electromagnetic sensor suitable for ultra wide band applications.
Abstract: In present work, one novel approach has been implemented to improve the performance of monopole loaded hybrid dielectric resonator antennas (DRAs). The antenna has been designed by incorporating two different kinds of conical dielectric resonator rings with conventional monopole. Further, the performance of the antenna has been improved by introducing sleeve-like structure. The proposed antenna operates over the frequency range 4–30 GHz which provides 120% impedance bandwidth ( $\mathbf{S}_{11}\leq-10\ \mathbf{dB}$ ) with peak gain of about 5 dBi. It can be used as an electromagnetic sensor suitable for ultra-wide band applications.

2 citations

Proceedings ArticleDOI
10 Jul 2016
TL;DR: In this paper, a magneto-dielectric material of high permittivity and high permeability has been used as a loading element on a standard quarter wavelength monopole antenna.
Abstract: This paper presents the use of a high permittivity and high permeability magneto-dielectric material to reduce the height of a monopole antenna without sacrificing the desired bandwidth. A magneto-dielectric material of high permittivity and high permeability has been used as a loading element on a standard quarter wavelength monopole antenna. In our design, the magneto-dielectric material is placed on the top and the bottom of the antenna to achieve reduction in the resonant frequency. It is shown that a monopole designed at a frequency of 1.12GHz can have its resonance frequency shifted to 0.89GHz. Most of the known magneto-dielectric materials tend to be lossy. The radiation efficiency of loaded antenna is better than 60% over the matched impedance bandwidth.

2 citations

Proceedings ArticleDOI
01 Dec 2015
TL;DR: In this paper, a new metallic loading on the outer surface of cylindrical ring dielectric resonator antenna is investigated for bandwidth reconfigurability, which can be used to change the bandwidth requirement without affecting the radiator or its radiation characteristics.
Abstract: A new metallic loading on the outer surface of cylindrical ring dielectric resonator antenna is investigated for bandwidth reconfigurability. The proposed design exhibits considerable shift of upper cut-off frequency (from 8.2 – 15.9 GHz) with varying height of the metallic loading on outer surface of the cylindrical ring DR and thereby providing the bandwidth controllability. The designed prototype has been fed by coaxial cable of standard dimensions. This hybrid DRA structure is simulated using CST Microwave Studio Suite 2014. Proposed concept can be used to change the bandwidth requirement without affecting the radiator or its radiation characteristics.

1 citations


Cites methods from "Monopole-type dielectric resonator ..."

  • ...The proposed antenna is derived from a hybrid combination of a cylindrical ring dielectric resonator excited by a quarter-wave length long vertical electric monopole exhibiting a very wide bandwidth [5]....

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References
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Journal ArticleDOI
TL;DR: In this paper, the authors examined the multiple resonance phenomenon responsible for the ultra wideband response of the hybrid monopole-dielectric resonator antenna (DRA) and developed guidelines for designing the antennas for any specified frequency band.
Abstract: This letter examines in detail multiple resonance phenomenon responsible for the ultra wideband response of the hybrid monopole-dielectric resonator antenna (DRA). The physical insight gained by this investigation has lead to improved guidelines for designing the antennas for any specified frequency band. These simple guidelines are then verified using both simulated and measured data

119 citations


"Monopole-type dielectric resonator ..." refers background in this paper

  • ...The first candidate in this monopole-DRA family is annular ring DRA, centrally excited by electric monopole [1], which can provide up to 3:1 bandwidth....

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  • ...Different research groups have contributed significantly in the development of its improved versions [1][6]....

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Journal ArticleDOI
TL;DR: In this article, a half-hemispherical dielectric resonator antenna (h-HDRA) is proposed and a two-element h-HDRA configuration is employed to design a broadband monopole-type radiator.
Abstract: A new half-hemispherical dielectric resonator antenna (h-HDRA) is proposed and a two-element h-HDRA configuration is employed to design a broadband monopole-type radiator. Two half sections of a hemispherical DRA are employed to enhance the impedance bandwidth by introducing an additional resonant mode. Since the new geometry of an h-HDRA is studied here for the first time, it is characterized using simulation and experimental studies. Two closely spaced resonant modes, which in a two-element h-HDRA generate monopole-type radiation are investigated. Results for both the single and two-element h-HDRAs are presented. As much as 35% impedance bandwidth (S11<-10dB) with more than 5 dBi peak gain, 99.08% efficiency and monopole-type radiation pattern has been demonstrated using a prototype occupying a compact volume measuring 0.48lambda0 by 0.2lambda0 approximately, lambda0 being the wave length corresponding to the center of the impedance bandwidth

83 citations

Journal ArticleDOI
TL;DR: In this article, two geometries of dielectric ring resonator (DRR) have been investigated as new variants for designing ultrawideband hybrid monopole-DRAs with improved features.
Abstract: Two geometries of dielectric ring resonator (DRR) have been investigated as new variants for designing ultrawideband hybrid monopole-DRAs (dielectric resonator antennas) with improved features. They are simply hemispherical and conical in shape and have been implemented individually. Hybrid monopole-DRA is actually a combined configuration using a grounded monopole surrounded by a small DRR touching the same ground plane. Compared to an earlier version using cylindrical DRR of same dielectric material, the proposed ones promise for about 25% larger impedance bandwidth maintaining identical gain and radiation properties. As much as 126% impedance bandwidth with consistent monopole type radiation and 2-4 dBi peak gain has been demonstrated using a set of prototypes shaped from dielectric rod with er = 10. Physical insight in to the ultrawideband operation along with a comprehensive design guideline is presented.

77 citations


"Monopole-type dielectric resonator ..." refers background in this paper

  • ..., 126% [6] and that could be achieved using hemispherical and conical DRR....

    [...]

  • ...Different research groups have contributed significantly in the development of its improved versions [1][6]....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the performance of a T-shaped monopole antenna loaded with an annular dielectric resonator as an ultrawideband transmitting/receiving antenna is presented.
Abstract: This letter presents the performance of a T-shaped monopole antenna loaded with an annular dielectric resonator as an ultrawideband transmitting/receiving antenna. By adjusting the length of the monopole and load arm, a 10-dB bandwidth of 110% is achieved while maintaining monopole-like radiation pattern. The antenna factor of the same antenna, while used as electromagnetic interference (EMI) sensor is also presented for the desired and cross-polarized component of incident electric field. The results for antenna factor show an ultrawide bandwidth with the cross-polarization isolation better than 86 dB/m for the T-monopole/DRA as EMI sensor. The simulated result for return loss is verified with the measured data from a prototype antenna.

55 citations

Journal ArticleDOI
TL;DR: In this article, a new pawn-shaped dielectric ring resonator fed by a simple quarter-wave monopole has been investigated as a new variant of the hybrid monopole-dielectric resonator antenna (DRA).
Abstract: A new pawn-shaped dielectric ring resonator (DRR) fed by a simple quarter-wave monopole has been investigated as a new variant of the hybrid monopole-dielectric resonator antenna (DRA). The new geometry, conceived intuitively, significantly improves the impedance bandwidth compared to all earlier versions reported in open literature. S11 < -10 dB occurring over 5.523 GHz has been experimentally demonstrated, indicating over 4:1 ratio bandwidth, i.e., more than 122% impedance bandwidth around the center of the band. The prototype has been shaped from a dielectric rod with epsivr =10. Such ultrawideband (UWB) response is caused by multiple resonances occurring by the hybrid monopole-DRA structure . These resonances are identified through several experimental and simulation studies. Uniform monopole-type radiation occurring over the entire bandwidth has been confirmed using measured and simulated results. The peak gain varies from 4 to 6 dBi as a function of frequency. Such useful properties can be successfully used to realize UWB monopole antennas for wireless communications and as wideband electromagnetic interference (EMI) sensors.

50 citations