Segmented hemispherical DRA in composite form for radiation pattern diversity
01 Dec 2015-pp 1-2
TL;DR: In this paper, a three-element HDRA antenna with a common coaxial probe has been examined for the first time indicating radiation pattern diversity with about 4 dBi peak gain in S-band over a wide operating bandwidth.
Abstract: A quarter of a hemispherical dielectric resonator antenna (HDRA) has been reinvestigated in this paper to realize a composite configuration. A designer can have a degree of freedom in choosing the number of elements. A three-element configuration, excited with a common coaxial probe, has been examined in here for the first time indicating radiation pattern diversity with about 4 dBi peak gain in S-band over a wide operating bandwidth.
Citations
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TL;DR: In this article, an economical conformal subgridding scheme is proposed to model the object with concave and convex surfaces accurately, and double conforming procedure with coarse grid (CG) and fine grid (FG) guarantees the modeling accuracy.
Abstract: To model the object with concave and convex surfaces accurately, an economical conformal subgridding scheme is proposed in this article. Its double conforming procedure with coarse grid (CG) and fine grid (FG) guarantees the modeling accuracy. Fast linear interpolation effectively exchanges electromagnetic fields information on the interface between grids of two sizes. One-step leapfrog alternating direction implicit (ADI) finite-difference time-domain (FDTD) method overcomes the Courant stability condition in FG region; meanwhile, conventional FDTD ensures the efficiency of simulation in CG region. While we concern the unconditionally stable method, there is not any grid omitted in our irregularly profiled fine region and any extra time wasted in solving small-scale tridiagonal matrixes cell by cell. To verify our codes, a 2-D arc component has been simulated first. Then the performance of a probe-fed normal one-eighth spherical dielectric resonator antenna (DRA), a new designed conformal-microstrip-fed one-eighth spherical shell DRA, and a four-element array with the spherical shell DRAs connected by a T-shaped power divider has been calculated by our codes. Satisfactory performance of the antenna has been obtained in return loss and radiation patterns, which are verified by measured results. The shell antenna features smaller size, lighter weight, and more convenience in conforming to the corners of the instrument housing, even with different dimensions. Most particularly, the proposed conformal subgridding scheme and its hybrid FDTD implementation perform outstandingly in simulating the thin shell antenna in terms of computer memory, CPU time, as well as accuracy.
3 citations
References
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TL;DR: In this paper, a new four-element cylindrical dielectric resonator array is proposed as a wideband low profile monopole-like antenna, which employs the dominant HEM11delta mode in each CDR.
Abstract: A new four-element cylindrical dielectric resonator (CDR) array is proposed as a wideband low profile monopole-like antenna. Unlike previous investigations, the present antenna is easy to design and excite as it employs the dominant HEM11delta mode in each CDR. Ansoft's HFSS based design data and experimental results are presented. As much as 29% matching bandwidth (S11<-10 dB) with monopole-like radiation pattern over the entire band has been achieved with 4 dBi peak gain from a prototype occupying a very compact space measuring 0.6lambda0 by 0.1 lambda0 approximately
106 citations
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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
79 citations
"Segmented hemispherical DRA in comp..." refers background in this paper
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TL;DR: In this article, a four-element dielectric resonator antenna (HDRA) is investigated by splitting it into four uniform quarters, which indeed generates a new DRA shape, proposed to call as "quarter-Hemispherical DRA" (q-HDRA).
Abstract: Hemispherical dielectric resonator antenna (HDRA) is reinvestigated by splitting it into four uniform quarters, which indeed generates a new DRA shape, proposed to call as “quarter-Hemispherical DRA” (q-HDRA). An innovative idea, gathered by the authors through their previous investigations, has been employed to investigate four-element q-HDRA resonating with dominant and first higher modes over a large impedance bandwidth (S11 <; -10dB) and producing improved monopole-like radiation pattern. The improvement has been described in terms of uniformity and symmetry in the radiation patterns obtained consistently over the entire operating bandwidth. No degradation or compromise in impedance bandwidth is observed. For this purpose, the new DRA unit (q-HDRA) has been characterized using simulated and measured data. Prototypes of single and multi-element q-HDRA have been measured and compared with some earlier versions. Unlike earlier one, consistently symmetric monopole-like radiation from a four element q-HDRA has been demonstrated.
52 citations
"Segmented hemispherical DRA in comp..." refers background or methods in this paper
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TL;DR: In this article, a dual segment three element triangular dielec-tric resonator antenna (TDRA) has been proposed for applications in X-band, and the simulation results for input characteristics and radiation patterns of the proposed antenna are compared with corresponding ex- perimental results at the resonant frequency.
Abstract: A wideband dual segment three element triangular dielec- tric resonator antenna (TDRA) has been proposed for applications in X-band. Proposed antenna has been fabricated and tested. The simu- lation study of the antenna is carried out using Ansoft HFSS simulation software. The simulation results for input characteristics and radiation patterns of the proposed antenna are compared with corresponding ex- perimental results at the resonant frequency. The simulation results are in agreement with the measurement results. The return loss-frequency characteristics of the proposed antenna are also compared with those of single element, and three element TDRAs.
20 citations
"Segmented hemispherical DRA in comp..." refers background in this paper
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TL;DR: In this article, a wideband (4.94-6.959 GHz) four element rectangular dielectric resonator antenna array was designed for 5.0 GHz WLAN and WiMAX band and its radiation characteristics determined through simulation studies using CST Microwave Studio software.
Abstract: A wideband (4.94-6.959 GHz) four element rectangular dielectric resonator antenna array has been designed for 5.0 GHz WLAN and WiMAX band and its radiation characteristics determined through simulation studies using CST Microwave Studio software. Further, simulation results for power absorption in a homogenous bio-medium (muscle layer) in direct contact with the proposed antenna array is presented in terms of specific absorption rate (SAR) distribution in the medium.
2 citations
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