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A broadband dumbbell‐shaped dielectric resonator antenna
Author(s) -
Chaudhary Raghvendra Kumar,
Srivastava Kumar Vaibhav,
Biswas Animesh
Publication year - 2014
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28743
Subject(s) - dielectric resonator antenna , dumbbell , optics , wideband , broadband , microwave , bandwidth (computing) , materials science , resonator , dielectric , electrical impedance , coaxial , reflection coefficient , physics , acoustics , optoelectronics , electrical engineering , engineering , telecommunications , medicine , physical therapy , quantum mechanics
In this article, a dumbbell‐shaped dielectric resonator antenna (DRA) fed by coaxial probe is proposed for wideband applications. The proposed dumbbell‐shaped DRA can be achieved by three‐layer structure of same material where the radius of middle cylinder is smaller than the top and bottom disc. In dumbbell‐shaped DRA, the effective permittivity varies in both axial and radial direction. A complex hybrid mode similar to HE 11δ mode is excited through a coaxial probe. The proposed dumbbell‐shaped DRA provides the measured impedance bandwidth of 57.59% (at resonance frequency of 4.48 GHz) from 4.11 to 6.69 GHz for input reflection coefficient (S 11 ) less than −10 dB. The simulated and measured radiation patterns are consistent throughout the operational bandwidth. The average measured gain of proposed antenna is 4.88 dB in the frequency range of 4.11–6.69 GHz. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2944–2947, 2014