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Journal ArticleDOI

Experimental Investigation of New Radiating Mode in Rectangular Hybrid Dielectric Resonator Antenna

04 Feb 2011-IEEE Antennas and Wireless Propagation Letters (IEEE)-Vol. 10, Iss: 10, pp 91-94
TL;DR: In this paper, a rectangular dielectric-metal strip composite resonator antenna with TExδ01 mode is introduced, which has an impedance bandwidth of 85 MHz at 3.5 GHz and a gain of about 5.72 dBi.
Abstract: A rectangular dielectric-metal strip composite resonator antenna with TExδ01 mode is introduced. The value of 6 approaches zero for a dielectric with high permittivity. The TExδ01 mode has been explored with the possibility of a radiating mode in the hybrid dielectric-air resonator antenna with good radiation efficiency and broadside pattern. Owing to special electric field distributions, the resonant frequency of the TExδ01 mode is mainly determined by the dimension along the z-axis and relatively stable regardless of changes in length along y-axis. The proposed antenna has an impedance bandwidth of 85 MHz at 3.5 GHz and a gain of about 5.72 dBi. A prototype is fabricated and measured. Measured and simulated results show high accordance.
Citations
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Journal ArticleDOI
TL;DR: In this article, a CPW slot loop fed Minkowski shaped fractal dielectric resonator antenna is proposed to bring higher order modes close together to realize a wide impedance bandwidth.
Abstract: A CPW slot loop fed Minkowski shaped fractal dielectric resonator antenna is proposed. Self similar property of fractal geometry is utilized to bring higher order modes close together to realize a wide impedance bandwidth. A comparative study of the resonant frequency behavior between the well established fractal electrical boundary antennas and fractal magnetic boundary antennas is presented to provide insight into the functionality of the proposed antenna. The comparison highlights the fact that electrical boundary lowers resonance frequency, whereas fractal magnetic boundary increases the resonant frequency. Minkowski fractal is also compared with Koch fractal and Sierpinski curve geometries. It is observed that the Minkowski fractal DRA yields the widest impedance bandwidth along with stable gain amongst the three proposed geometries. The proposed antenna exhibits a fractional bandwidth of 64% (5.52 -10.72 GHz) and a maximum gain of 4.9 dBi.

124 citations


Cites background from "Experimental Investigation of New R..."

  • ...Of late, hybrid dielectric resonator antennas have attracted attention due to their dual-band and wideband operation without increasing antenna volume [11]–[13]....

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Journal ArticleDOI
TL;DR: In this article, a water-based rectangular dielectric resonator antenna is designed and analyzed for measuring liquid permittivities, and an analytical model of liquid real relative permittivity as a function of the antenna resonance frequency is developed.
Abstract: In this study, a water-based rectangular dielectric resonator antenna is designed and analysed. The compactness of the antenna because of the high relative permittivity of water is demonstrated in both simulation and experiment. In addition, a dielectric resonator antenna-based technique is proposed for measuring liquid permittivities. The resonance frequencies of the antennas with fixed configurations are obtained from finite-element electromagnetic (EM) simulation for liquids with different permittivity values. An analytical model of liquid permittivity as a function of the antenna resonance frequency is then developed. Based on this predictive model, the measurement of the liquid real relative permittivity can be easily achieved by measuring the antenna resonance frequency. The measured permittivity values of distilled water and 10% glucose solution are in agreement with previous data in the literature, demonstrating the effectiveness of the proposed liquid permittivity measurement technique.

40 citations

Journal ArticleDOI
TL;DR: A comprehensive review of the state-of-the-art techniques and geometries which have been explored in the areas of dielectric Resonator Antennas (DRA) can be found in this article.
Abstract: This paper presents a comprehensive review of the state of art techniques and geometries which have been explored in the areas of Dielectric Resonator Antennas (DRA). With the evolution of first re...

35 citations


Cites background from "Experimental Investigation of New R..."

  • ...In [92], new resonant mode, TEδ01 is studied and it is observed that modified RDRA improves radiation efficiency with stable boresight radiation pattern....

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Journal ArticleDOI
TL;DR: In this article, the authors proposed a hybrid dielectric resonator antenna (DRA) with a combination of a rectangular DRA and two printed patches, which achieved high gain and low cross-polarization.
Abstract: By loading two printed patches to the dielectric resonator antenna (DRA), a compact wide-band hybrid dielectric resonator antenna with enhanced gain and low cross-polarization is presented. The proposed antenna utilizes a combination of a rectangular dielectric resonator and two printed patches. Due to the hybrid design, multiple resonances were obtained. By adding two air layers between the dielectric resonator and the printed patches, the bandwidth has been significantly improved. Compared to the traditional hybrid dielectric resonator antenna, the proposed antenna can achieve wide bandwidth, high gain, low cross-polarization, and even small size simultaneously. The prototype of the proposed antenna has been fabricated and tested. The measured −10 dB return loss bandwidth is 25.6% (1.7–2.2 GHz). The measured antenna gains are about 6.3 and 8.2 dBi in the operating frequency band. Low cross-polarization levels of less than −28.5 dB and −43 dB in the E-plane and H-plane are achieved. Moreover, the overall dimensions of the antenna are only 67 × 67 × 34 (mm3). The proposed antenna is especially attractive for small base antenna applications.

10 citations


Cites background from "Experimental Investigation of New R..."

  • ...In [15], the authors first introduce TExδ01 in the hybrid DRA design....

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Journal ArticleDOI
TL;DR: In this article, the authors proposed the TE $δδ 1/δ δ 1 /δ √ 1/γ 2/γ 3/γ 4/γ 5/γ 6/γ 7/γ 8/γ 9/γ 10/γ 11/γ 12/γ 13/γ 14/γ 15/γ 16/γ 17/γ 18/γ 19/γ 20/γ 21/γ 22/γ 23/γ 24/γ 25/γ 28/γ 30/γ 31/γ 32/γ 34/
Abstract: The TE $_{\delta 01}^{x}$ mode excited in a rectangular dielectric resonator antenna (DRA) with metal coating is presented. This mode was first proposed in a hybrid DRA in our previous work. To compare it to the traditional dominant mode and further show its characteristics, a set of simple rectangular DRAs with and without metal coating was designed, fabricated, and measured in this letter. These DRAs are mounted on the ground plane and fed by a coupling slot. Due to specific field distributions, the TE $_{\delta 01}^{x}$ mode can work at a much lower frequency than the traditional one in the rectangular DRA with the same dimensions. In addition, broadside radiation pattern and good radiation efficiency over the operating bandwidth are also obtained.

8 citations

References
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Journal ArticleDOI
TL;DR: In this paper, a comprehensive review of the modes and the radiation characteristics of open dielectric resonators (DRs) of different shapes, such as cylindrical, spherical, and rectangular, is presented.
Abstract: Open dielectric resonators (DRs) offer attractive features as antenna elements. These include their small size, mechanical simplicity, high radiation efficiency due to no inherent conductor loss, relatively large bandwidth, simple coupling schemes to nearly all commonly used transmission lines, and the advantage of obtaining different radiation characteristics using different modes of the resonator. In this article, we give a comprehensive review of the modes and the radiation characteristics of DRs of different shapes, such as cylindrical, cylindrical ring, spherical, and rectangular. Further, accurate closed form expressions are derived for the resonant frequencies, radiation Q-factors, and the inside fields of a cylindrical DR. These design expressions are valid over a wide range of DR parameters. Finally, the techniques used to feed DR antennas are discussed. © 1994 John Wiley & Sons, Inc.

861 citations


"Experimental Investigation of New R..." refers background in this paper

  • ...ciency [4], and ease of integration with other active or passive microwave elements....

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Journal ArticleDOI
TL;DR: In this paper, the resonant frequencies and radiation Q-factors of the lowest order "magnetic-dipole" modes are derived on the basis of a first-order theory.
Abstract: Theoretical and experimental investigations on rectangular dielectric resonator antennas having a value of /spl epsiv//sub r/, in the range of 10 to 100 are reported. The resonant frequencies and radiation Q-factors of the lowest order "magnetic-dipole" modes are derived on the basis of a first-order theory. The accuracy of the model in predicting the resonant frequency and radiation Q-factor is verified by comparison with results of a rigorous theory and experiments. Various feeds for the antennas such as probe, microstrip slot, and microstrip line are described. Measured radiation patterns are shown and the effect of feed and mode degeneracy on the cross-polarisation levels is discussed.

703 citations


"Experimental Investigation of New R..." refers background or methods in this paper

  • ...According to the DWM [8], the resonant fre-...

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  • ...Meanwhile, according to the dielectric waveguide model (DWM) [8], the resonant frequencies of commonly used modes in rectangular DRA are determined...

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  • ...Meanwhile, according to the dielectric waveguide model (DWM) [8], the resonant frequencies of commonly used modes in rectangular DRA are determined Manuscript received January 14, 2011; accepted January 25, 2011....

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  • ...According to the DWM [8], the resonant frequency of the TE mode is thus mainly determined by dielectric constant, height, and width....

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Journal ArticleDOI
TL;DR: Low profile rectangular dielectric resonator antennas, fabricated out of a very high permittivity material ( epsilon /sub r/=100), were reported in this paper. But their performance was limited to 3% bandwidth.
Abstract: Low profile rectangular dielectric resonator antennas, fabricated out of a very high permittivity material ( epsilon /sub r/=100) are reported. An antenna having a height of approximately 0.026 lambda /sub 0/ and a bandwidth of 3% is demonstrated.< >

160 citations


"Experimental Investigation of New R..." refers background in this paper

  • ...They offer the potential advantages of smaller size [3], loss-free conductivity, higher radiation effi-...

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Journal ArticleDOI
TL;DR: In this article, the authors measured the radiation efficiency of dielectric resonator antennas in the dominant hybrid (HE/sub 11/spl delta) mode and showed that the conduction losses are quite small.
Abstract: Radiation efficiency (due to conduction and dielectric losses) of dielectric resonator antennas has been measured. Results show that for dielectric resonators placed directly on a metallic plane, the conduction losses are quite small. A radiation efficiency of >98% has been measured for dielectric resonator antennas operated in the dominant hybrid (HE/sub 11/spl delta//) mode. Theoretical considerations show scope of further improvement in the radiation efficiency by choosing optimum resonator parameters. >

127 citations


"Experimental Investigation of New R..." refers background in this paper

  • ...For comparison, the radiation efficiency of the cylindrical DRA operated in the hybrid HE mode is about 98% [9]....

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Proceedings ArticleDOI
20 Jun 2004
TL;DR: In this paper, a design strategy to obtain low loss, small size dielectric antennas, by using very high Dielectric constant materials is described, which is shown how by properly selecting the resonator shape and combining different resonant modes it is possible to design DRA with compact size and wide frequency coverage even at cellular frequencies.
Abstract: In this paper a design strategy to obtain low loss, small size dielectric antennas, by using very high dielectric constant materials is described. It is shown how by properly selecting the resonator shape and combining different resonant modes it is possible to design dielectric resonator antennas (DRA) with compact size and wide frequency coverage even at the cellular frequencies. Simple formulas are presented to illustrate the design procedure and allow a quick dimensioning of the antenna. Furthermore the paper describes techniques to enhance the response provided by the natural resonance frequencies of DRA, by adding parasitically coupled conducting strips, to enable multi-band operation. Results and examples are reported, showing the effectiveness of the proposed technique.

77 citations


"Experimental Investigation of New R..." refers background in this paper

  • ...These field distributions are directly represented by TE [6], [7]....

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