A Study on the Improvement of MIMO Antenna Isolation for Mobile Applications

In this paper, neutralization line structure have been employed to improve the isolation between the MIMO antenna system. The proposed MIMO antenna size is 116 mm × 64 mm × 5 mm and designed on FR-4(er = 4.4) ground substrate. Neutralization line was applied to enhance isolation between the each antenna eleme nts. The fabricated antenna satisfied a VSWR below 3 in LTE band B13 and the isolation between the MIMO antenna system is presented below -15dB. On the H-plane, antenna shows an omnidirectional pattern. In LTE band B13, the antenna presents a gain of a -2.6dBi ∼-1.18dBi and radiation efficiency of 33.49% ∼ 46.45%. Comparing measurement result with the outcome of simulation, the proposed MIMO antenna is expected to be applied for mobile application.

[1]  J. D. Parsons,et al.  The Mobile Radio Propagation Channel , 1991 .

[2]  Kin-Lu Wong,et al.  Compact planar inverted‐F patch antenna for triple‐frequency operation , 2002 .

[3]  M. Martinez-Vazquez,et al.  Volume considerations in the design of dual-band handset antennas , 2001, IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229).

[4]  Constantine A. Balanis,et al.  Antenna Theory: Analysis and Design , 1982 .

[5]  Pertti Vainikainen,et al.  Dual frequency helical antennas for handsets , 1996, Proceedings of Vehicular Technology Conference - VTC.

[6]  Alan Kai-Hau Yeung,et al.  Challenges in the migration to 4G mobile systems , 2003, IEEE Commun. Mag..

[7]  M. J. Gans,et al.  On Limits of Wireless Communications in a Fading Environment when Using Multiple Antennas , 1998, Wirel. Pers. Commun..

[8]  Suk-Youb Kang,et al.  Broadband planar antenna with T-shaped strip and capacitively coupled shorted strip , 2011 .