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    Compact and closely spaced tunable printed F-slot multiple-input–multiple-output antenna system for portable wireless applications with efficient diversity

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    Publication date
    2014-11-27
    Author
    Elfergani, Issa T.
    Hussaini, Abubakar S.
    Rodriguez, Jonathan
    Abd-Alhameed, Raed A.
    See, Chan H.
    Jan, Naeem A.
    Zhu, Shaozhen (Sharon)
    McEwan, Neil J.
    Keyword
    Multiple-Input Multiple-Output; MIMO; Tunable antenna; Varactor diode
    Rights
    © 2014 The Institution of Engineering and Technology. This paper is a preprint of a paper accepted by IET Science, Measurement and Technology and is subject to Institution of Engineering and Technology Copyright (http://scitation.aip.org/journals/doc/IEEDRL-home/info/support/copyinf.jsp). The copy of record is available at IET Digital Library.
    Peer-Reviewed
    Yes
    
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    Abstract
    In this work, miniaturized tunable two-antenna MIMO systems composed of printed F-slot shaped is developed to operate in the GPS, PCS, DCS and UMTS bands. The two-element MIMO antenna occupies a volume of 50 × 37.5 ×1.6 mm3, and is printed on an FR4 substrate. Initially, the frequency tunability of the MIMO antennas was verified by lumped capacitors with values between 0.75 to 2.75 pF to achieve a tuning range from 1.55 to 2.07GHz while the low mutual coupling between the radiators was accomplished by adding an I-shaped branch to a cut-away ground plane. The two antennas are then loaded with varactors to simultaneously achieve miniaturization and tunability. Simulation and measurement results demonstrate the successful implementation of a tunable MIMO with coupling reduction mechanism for a portable handheld wireless transceiver. The channel capacity of the proposed antenna is investigated and found to be close to that of an un-correlated system with efficient diversity in which the mutual coupling across the full bandwidth was better than -13dB. Owing to the compact size and ease of manufacture, the proposed antennas can be a promising solution for adaptive MIMO systems in handheld devices.
    URI
    http://hdl.handle.net/10454/8481
    Version
    Accepted Manuscript
    Citation
    Elfergani ITE, Hussaini AS, Rodriguez J, Abd-Alhameed RA, See CH, Jan N, Zhu S and McEwan NJ (2014) Compact and closely spaced tunable printed F-slot multiple-input–multiple-output antenna system for portable wireless applications with efficient diversity. IET Science, Measurement and Technology. 8(6): 359-369.
    Link to publisher’s version
    http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6985845
    Type
    Article
    Collections
    Engineering and Informatics Publications

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