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A Miniaturized Folded Antenna Array for MIMO Applications

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Abstract

In this paper, a novel cylindrical antenna array of a miniaturized structure is introduced for multi input multi output systems. The antenna array is consistent of four omega-shaped monopoles folded on a flexible cylindrical substrate of Kodak photo papers. The cylinder height is fixed to λo/4.5 with a diameter of λo/3.5, where λo is the free space wavelength at 2.25 GHz, with a separation distance between monopole elements of λo/29. The maximum mutual coupling between the monopoles elements over the frequency range from 2 to 3 GHz is found about −30 dB at the resonant frequency. Such coupling reduction is achieved by mounting conformal Spit Ring Resonators between the monopoles and backed by an electromagnetic band gap structure. An Ink-jet deposition process is used to print the array structure with sliver nano-particles on the substrate. Experimentally, S 11 spectrum is measured as well as the radiation patterns on both E- and H-plans at 2.25 GHz. It is found, the proposed array exhibits a gain of 2.5 dBi with broad side radiation patterns. An excellent agreement is achieved between the measured and simulated results.

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Acknowledgements

The author would like to thank the Engineering Collage/Department of Electrical Engineering at the UPM for their valuable support during the numerical simulations and measurements.

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Authors and Affiliations

  1. Department of Communication Engineering, Al-Mammon University College, Baghdad, Iraq

    Taha A. Elwi

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  1. Taha A. Elwi
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Correspondence to Taha A. Elwi.

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Elwi, T.A. A Miniaturized Folded Antenna Array for MIMO Applications. Wireless Pers Commun 98, 1871–1883 (2018). https://doi.org/10.1007/s11277-017-4950-4

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  • DOI: https://doi.org/10.1007/s11277-017-4950-4

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