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  • 51.
    Zhao, Kun
    et al.
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Zhang, Shuai
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Ishimiya, Katsunori
    Ying, Zhinong
    He, Sailing
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Body-Insensitive Multimode MIMO Terminal Antenna of Double-Ring Structure2015In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 63, no 5, p. 1925-1936Article in journal (Refereed)
    Abstract [en]

    In this paper, we propose a novel multimode multi-input multi-output (MIMO) antenna system composed of a dual-element MIMO cellular antenna and dual-element MIMO Wi-Fi antenna for mobile terminal applications. The antenna system has a double-ring structure and can be integrated with the metal frame of mobile terminals. With the multimode excitation, the MIMO cellular antenna can operate at 830-900 MHz, 1700-2200 MHz, and 2400-2700 MHz, for 2G, 3G, and LTE bands, respectively. The MIMO Wi-Fi antenna can cover two Wi-Fi bands from 2.4 to 2.5 GHz and from 5.2 to 5.8 GHz. The effect of a user's body on the MIMO cellular antenna is investigated on CTIA standard phantoms and a real user. Since our antenna mainly operates in the loop mode, it has a much lower efficiency loss than conventional mobile antennas in both talking and data modes. Our theoretical analysis and experiments have shown that our design has low body loss and an attractive industrial design.

  • 52.
    Zhao, Kun
    et al.
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Zhang, Shuai
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    Ying, Z.
    Bolin, T.
    He, Sailing
    KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
    SAR study of different MIMO antenna designs for LTE application in smart mobile handsets2013In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 61, no 6, p. 3270-3279Article in journal (Refereed)
    Abstract [en]

    This paper mainly focuses on the specific absorption rate (SAR) of the dual-element LTE MIMO antenna in mobile phones. Four designs of dual-element MIMO antenna (namely, dual semi-ground-free planar inverted-F antenna (PIFA), co-located antenna, dual OG PIFA in parallel position, and dual OG PIFA in orthogonal position) are studied under four typical LTE frequency points (0.75, 0.85, 1.9, and 2.1/2.6 GHz) when the ground plane length varies from 90 to 150 mm. The SAR, when dual elements operate simultaneously, is also studied through the SAR to PEAK location spacing ratio (SPLSR) according to the FCC standard. The simulations are carried out on both an SAM head phantom and a flat phantom by CST 2011, and measurements on the flat phantom are made with iSAR and DASY4 to verify the accuracy of our simulations.

  • 53. Zhao, Yimin
    et al.
    Ju, Dehang
    Wahlberg, Bo
    KTH, Superseded Departments, Signals, Sensors and Systems.
    Mareels, I. M. Y.
    Webster, I.
    Comments on "Experimental and theoretical comparison of some algorithms for beamforming in single receiver adaptive arrays" [with reply]1995In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 43, p. 1348-1349Article in journal (Refereed)
    Abstract [en]

    B.G. Wahlberg, I.M.Y. Mareels, and I. Webster (see ibid., vol.39, no.1, p.21, 1991) present a simple algorithm to estimate the covariance matrix by perturbing the weights W. Zhao and Ju point out that section II of the paper contains two errors. The basic error is in equation (17). This leads to errors in equation (18). Wahlberg et al. reply to the Comments.

12 51 - 53 of 53
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