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Journal ArticleDOI

Improved Design Guidelines for the Ultra Wideband Monopole-Dielectric Resonator Antenna

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
Citations
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Book ChapterDOI
15 Apr 2005
TL;DR: Linearly and circularly polarized conformal strip-fed dielectric resonator antennas (DRAs) are studied in this article, where a parasitic patch is used to excite a nearly degenerate mode.
Abstract: Linearly and circularly polarized conformal strip-fed dielectric resonator antennas (DRAs) are studied in this article. In the latter case, a parasitic patch is used to excite a nearly degenerate mode. The hemispherical DRA, excited in its fundamental broadside TE111 mode, is used for the demonstration. In the analysis, the mode-matching method is used to obtain the Green's functions, whereas the method of moments is used to solve for the unknown strip currents. In order to solve the singularity problem of the Green's functions, a recurrence technique is used to evaluate the impedance integrals. This greatly increases the numerical efficiency. Measurements were carried out to verify the calculations, with good results. Keywords: circularly polarized antenna; dielectric antennas; mode-matching methods; moment methods; parasitic antennas; resonance

898 citations

Journal ArticleDOI
TL;DR: An up-to-date literature overview on relevant approaches for controlling circuital characteristics and radiation properties of dielectric resonator antennas (DRAs) is presented in this paper.
Abstract: An up-to-date literature overview on relevant approaches for controlling circuital characteristics and radiation properties of dielectric resonator antennas (DRAs) is presented The main advantages of DRAs are discussed in detail, while reviewing the most effective techniques for antenna feeding as well as for size reduction Furthermore, advanced design solutions for enhancing the realized gain of individual DRAs are investigated In this way, guidance is provided to radio frequency (RF) front-end designers in the selection of different antenna topologies useful to achieve the required antenna performance in terms of frequency response, gain, and polarization Particular attention is put in the analysis of the progress which is being made in the application of DRA technology at millimeter-wave frequencies

194 citations


Cites background or methods from "Improved Design Guidelines for the ..."

  • ...The operational frequency band of the physical prototype presented in [56] extends from 5GHz to 13GHz with the magnitude of the input reflection coefficient smaller than −10 dB....

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  • ...Figure 25: Cross-sectional view of a hybrid DRA consisting of a monopole and a ring DR (a) as suggested in [56]....

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  • ...Another hybrid DRA design solution relying on the combination of amonopole antenna with a ring dielectric resonator is proposed in [56] (see Figure 25(a))....

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Journal ArticleDOI
TL;DR: In this paper, a wideband omnidirectional circularly polarized (CP) rectangular dielectric resonator antenna (DRA) is investigated in this communication, where an inclined slot, loaded by a parasitic conducting strip, is fabricated on each sidewall of the DRA.
Abstract: A wideband omnidirectional circularly polarized (CP) rectangular dielectric resonator antenna (DRA) is investigated in this communication. An inclined slot, loaded by a parasitic conducting strip, is fabricated on each sidewall of the DRA. The parasitic strips can excite a CP mode, which combines with the CP DRA mode to provide a wideband axial-ratio (AR) bandwidth of more than 25%. To fully utilize the increased AR bandwidth, the impedance bandwidth is also broadened by introducing a hollow cylinder at the center of the DRA. The hollow region is also used to accommodate a coaxial probe that excites the antenna. The reflection coefficient, AR, radiation pattern, antenna gain, and efficiency of the antenna are studied, and reasonable agreement between the measured and simulated results is observed. A parametric study was also carried out to characterize the proposed wideband CP omnidirectional antenna.

107 citations

Journal ArticleDOI
TL;DR: In this paper, a novel dielectric resonator antenna design is presented for wideband applications by using an optimized H-shaped across section and an optimized trapezoidal patch adhered on the concave surface of the resonator as a feeding mechanism, achieving an impedance bandwidth of about 62% (for VSWR les 2), covering the frequency range of 3.6-6.85 GHz.
Abstract: A novel dielectric resonator antenna design is presented for wideband applications in this letter. By using a dielectric resonator with an optimized H-shaped across section and an optimized trapezoidal patch adhered on the concave surface of the resonator as a feeding mechanism, an impedance bandwidth of about 62% (for VSWR les 2) , covering the frequency range of 3.6-6.85 GHz, is achieved. The measured results in terms of bandwidth and radiation pattern agree well with the simulated ones, confirming the theoretical design.

100 citations


Cites background or methods from "Improved Design Guidelines for the ..."

  • ...Other types of methods adopt special feeding mechanisms [8]–[11]....

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  • ...[11] have proposed a hybrid monopole-dielectric resonator antenna, and Kumar et al....

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Journal ArticleDOI
TL;DR: In this paper, a novel dielectric resonator antenna (DRA) is proposed for ultrawideband (UWB) applications, where a simple rectangular dielectoric resonator is excited by a bevel-shaped patch connected to a coplanar waveguide (CPW) feeding line.
Abstract: A novel dielectric resonator antenna (DRA) is proposed for ultrawideband (UWB) applications, where a simple rectangular dielectric resonator is excited by a bevel-shaped patch connected to a coplanar waveguide (CPW) feeding line. It is found that the bandwidth of the resonant modes can be expanded by using a CPW-fed ground and bevel-shaped patch, and thus a UWB performance can be achieved. Experimental and numerical results were carried out, showing a good agreement. The measured results demonstrate that the proposed DRA achieves an impedance bandwidth more than 3:1, covering the frequency range from 3.1 to 10.6 GHz, which is suitable for UWB applications. Furthermore, to minimise the potential interferences between the UWB system and narrowband systems, such as world interpretability for microwave access and WLAN, UWB DRAs with single band-notched and dual band-notched characteristics were designed, fabricated and measured. The measurement results show good performances in terms of VSWR, antenna gain and radiation pattern. With these features, the proposed antennas are expected to be good candidates in various UWB systems.

83 citations

References
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Journal ArticleDOI
TL;DR: In this paper, a hybrid antenna consisting of an annular dielectric resonator antenna combined with a quarter-wave monopole to simultaneously act as a radiator and a loading element is presented.
Abstract: A hybrid antenna is presented, consisting of an annular dielectric resonator antenna combined with a quarter-wave monopole to simultaneously act as a radiator and a loading element, producing an ultra wideband response. A prototype antenna is designed and a 3:1 bandwidth is demonstrated.

177 citations


"Improved Design Guidelines for the ..." refers background or methods in this paper

  • ...the resonant modes, we have chosen the same set of antenna parameters investigated in [3]....

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  • ...Parameters chosen as in [3]: a = 4:2 mm, b = 1:3 mm, h = 4:4 mm, l = 10 mm, r = 0:65 mm, and " = 10....

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  • ...An approximate guideline for designing the hybrid monopole-DRA was presented in [3]....

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  • ...6 is almost identical to the “prototype 2” in [3] whose measured radiation patterns at different frequencies of the operating band were presented [3, Fig....

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Journal ArticleDOI
TL;DR: In this paper, a dielectric ring resonator antenna structure which radiates like an electric monopole is reported, and experiments show that the proposed antenna configuration is potentially useful for constructing small and compact electric-monopole antennas.
Abstract: A dielectric ring resonator antenna structure which radiates like an electric monopole is reported. The use of high er resonator material leads to small antenna height. Experiments show that the proposed antenna configuration is potentially useful for constructing small and compact ‘electric-monopole’ antennas.

126 citations


"Improved Design Guidelines for the ..." refers methods in this paper

  • ...The design formula for the mode [5] can be applied to estimate the value for as...

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Journal ArticleDOI
TL;DR: A study of conventional antennas and why they are not suitable for a UWB system is described.
Abstract: Ultra wideband antennas are specifically designed to transmit and/or receive very short time durations of electromagnetic energy. It is well known that UWB antenna design remains the major factor in the progress of UWB technology. This article describes a study of conventional antennas and why they are not suitable for a UWB system.

118 citations


"Improved Design Guidelines for the ..." refers background in this paper

  • ...Ahybrid monopole-dielectric resonator antenna (DRA) exhibiting wideband performance was recently introduced [1] and subsequently studied [2]–[4]....

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Patent
24 Jul 2003
TL;DR: In this paper, an ultra-wideband antenna for operating in a frequency is disclosed wherein a monopole antenna extends from a ground plane and has an effective length L of one quarter wavelength at the lowest frequency f 1.
Abstract: An ultra-wideband antenna for operating in a frequency is disclosed wherein a monopole antenna extends from a ground plane. The monopole has an effective length L of one quarter wavelength at the lowest frequency f 1 . A dielectric resonator antenna (DRA) surrounds the monopole antenna for resonating at substantially between or at two and three times the lowest frequency f 1 . the DRA is of a height of less than ¾ L and is disposed in such a manner as being above the ground plane and either contacting or spaced therefrom by a gap G, wherein 0≦G≦0.2 H. The ultra-wideband antenna is of a much greater bandwidth than the sum of bandwidth of the monople or the DRA alone.

34 citations

Proceedings Article
01 Jul 2002
TL;DR: In this article, a broadband monopole with a dielectric resonator antenna (DRA) operating in a TM 01δ mode to maintain a desirable omnidirectional radiation pattern is investigated.
Abstract: A broadband monopole is investigated. The bandwidth enhancement is achieved by loading a monopole with a dielectric resonator antenna (DRA) operating in a TM 01δ mode to maintain a desirable omnidirectional radiation pattern. Preliminary results validate the design concept.

29 citations


"Improved Design Guidelines for the ..." refers background in this paper

  • ...Ahybrid monopole-dielectric resonator antenna (DRA) exhibiting wideband performance was recently introduced [1] and subsequently studied [2]–[4]....

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  • ...Top and cross-sectional views of a monopole-DRA proposed in [1]....

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