Dual port asymmetrical dumbbell-shaped dielectric resonator-based MIMO antenna with pattern diversity for wideband applications

ABSTRACTIn this article, a wideband ceramic-based dual port MIMO (Multi Input Multi Output) antenna is investigated and analyzed. Wideband features are obtained with the assistance of asymmetrical dumbbell-shaped cylindrical ceramic. Triple-band circular polarized waves are also obtained with an S-shaped aperture having unequal strip length. Other special characteristic of the proposed MIMO radiator is to achieve bidirectional pattern diversity by placing radiators in opposite direction. Measured outcomes confirm that the proposed radiator offers a fractional bandwidth of 65.04% (4.02 to 7.89 GHz) with less than −25 dB mutual coupling between two identical ports. In between the three frequencies range, i.e., 4.75 to 5.02 GHz, 5.75 to 6.2 GHz, and 7.55 to 7.82 GHz, the value of axial ratio is well below the value of 3 dB. Measured far-field pattern and diversity parameters authorize the appropriateness of the proposed radiator in MIMO system.KEYWORDS: Circular polarizationDielectric Resonator Antenna (DRA)MIMO Antennapattern diversity AcknowledgmentsAuthor, Anand Sharma, wishes to acknowledge the Council of Science and Technology, UP, India, for giving the financial support to conduct this work successfully with notification No. CST/D-2396 dated 24/03/2021.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThe work was supported by the Council of Science and Technology, U.P. [CST/D-2396 dated 24/03/2021].