Multiple Elements MIMO Antenna System With Broadband Operation for 5th Generation Smart Phones Articles uri icon

publication date

  • April 2022

start page

  • 38446

end page

  • 38457

volume

  • 10

International Standard Serial Number (ISSN)

  • 2169-3536

abstract

  • In this work, a simple, low-cost, dual wideband sub6GHz Multiple Input Multiple
    Output (MIMO) antenna system for a smart phone is presented. The antenna system is fabricated using
    inexpensive and commercially easily available 0.8 mm thick FR4 substrate. The presented system consists
    of a single main board and two side boards containing eight antennas and feedings. The radiating elements
    are etched on the side boards to provide space for other electronic components and RF systems and sub
    systems. The dimensions of the main board and the two side boards are 150 x 75 x 0.8 mm3 and
    150 x 6 x 0.8 mm3, respectively. The radiating elements are etched on the side substrates and the
    feeding network is designed on the main board. The proposed system resonates at 3.5 GHz and 5 GHz
    providing -10 dB bandwidth of 250 MHz (ranges from 3.3 GHz to 3.55 GHz) and 1700 MHz (ranges from
    4.2 GHz to 6.2 GHz), respectively. The design and the arrangement of the structure enable pattern diversity
    and ensures at least -15 dB of isolation between any two given radiating elements. Moreover, various
    different key performance parameters such as envelope correlation coefficient (ECC), mean effective gain
    (MEG), channel capacity (CC), specific absorption rate (SAR), gain, and efficiency are also presented. It is
    found that the peak gain of the system is 5.8 dBi, ECC is lower than 0.015, efficiency ranges between 58%
    to 78%, peak SAR is 1.28 W/Kg, and the maximum CC is 40.2 bps/Hz within the frequency band of interest.
    In addition, to further demonstrate the usefulness of such structure as a smart mobile terminal, single and
    dual hand scenarios are also presented. To validate the concept and the computed results, a prototype is
    fabricated and measured. It is found that the simulated results are in very good agreement with the measured
    results. Based on the performance and the measured results, we believe that this structure holds a promising
    future within the next generation smart mobile phones.

keywords

  • multi-input-multi-output (mimo), wideband, mutual coupling, envelope correlation; coefcient (ecc), pattern diversity, gain.