Your browser does not support JavaScript!

Eight-port orthogonally dual-polarised MIMO antennas using loop structures for 5G smartphone

Eight-port orthogonally dual-polarised MIMO antennas using loop structures for 5G smartphone

For access to this article, please select a purchase option:

Buy article PDF
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Your details
Why are you recommending this title?
Select reason:
IET Microwaves, Antennas & Propagation — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

An eight-port antenna array designed for future 5G 2.6 GHz band (2550–2650 MHz) for multi-input multi-output (MIMO) in the smartphone applications is presented. In order to enhance the port isolation and reduce correlation between antennas, square loop radiating strip with orthogonal polarisation is employed. The proposed antenna array is composed of four pairs of uniform antenna elements that are symmetrically placed at the four corners of the main board, and each antenna pair includes a communal square loop and two independently coupled feeding strips. By exciting the square loop from the two feeding strips, respectively, two orthogonally polarised waves are generated. Thus, four horizontally polarised and four vertically polarised antennas are achieved in total. Due to this feature, coupling between antenna pairs is reduced and the MIMO performances are enhanced. A prototype of the proposed antenna array was fabricated, and the experimental results show good impedance matching and acceptable isolation measured across the bands of interest. The MIMO performances such as envelope correlation coefficient, mean effective gain, multiplexing efficiency and channel capacity are also calculated. Besides, simulations of the antenna shifted to 3.5 GHz are also performed. The consistent performances indicate that the proposed structure has good scalability and is promising for future 5G smartphone applications.


    1. 1)
      • 11. Wang, X., Feng, Z.H., Luk, K.M.: ‘Pattern and polarization diversity antenna with high isolation for portable wireless devices’, IEEE Antennas Wirel. Propag. Lett., 2009, 8, pp. 209211.
    2. 2)
      • 2. Al-Dulaimi, A., Al-Rubaye, S., Ni, Q., et al: ‘5G Communications race: pursuit of more capacity triggers LTE in unlicensed band’, IEEE Veh. Technol. Mag., 2015, 10, (1), pp. 4351.
    3. 3)
      • 12. Ferrero, F., Diallo, S., Luxey, C., et al: ‘Pattern diversity versus polarization diversity in UMTS mobile phones’, 3rd European Conf. Antennas and Propagation, 2009, EuCAP 2009, 2009, pp. 15221525.
    4. 4)
      • 1. Mak, K.M., Lai, H.W., Luk, K.M., et al: ‘Circularly polarized patch antenna for future 5G mobile phones’, IEEE Access, 2015, 2, pp. 15211529.
    5. 5)
      • 7. Wong, K.L., Lu, J.Y.: ‘3.6-GHz 10-antenna array for MIMO operation in the smartphone’, Microw. Opt. Technol. Lett., 2015, 57, (7), pp. 16991704.
    6. 6)
      • 21. Plicanic, V.: ‘Antenna diversity studies and evaluation’. MS thesis, Department of Electroscience, Lund University, 2004. Available at
    7. 7)
      • 15. Oh, T., Lim, Y.G., Chae, C.B., et al: ‘Dual-polarization slot antenna with high cross-polarization discrimination for indoor small-cell MIMO systems’, IEEE Antennas Wirel. Propag. Lett., 2015, 14, pp. 374377.
    8. 8)
      • 9. Li, M.Y., Ban, Y.L., Xu, Z.Q., et al: ‘8-port orthogonally dual-polarized antenna array for 5G smartphone applications’, IEEE Trans. Antennas Propag., 2016, 64, pp. 38203830.
    9. 9)
      • 17. Zheng, W.C., Zhang, L., Li, Q.X., et al: ‘Dual-band dual-polarized compact bowtie antenna array for anti-interference MIMO WLAN’, IEEE Trans. Antennas Propag., 2014, 62, (1), pp. 237246.
    10. 10)
      • 13. Sonkki, M., Antonino-Daviu, E., Ferrando-Bataller, M., et al: ‘Planar wideband polarization diversity antenna for mobile terminals’, IEEE Antennas Wirel. Propag. Lett., 2011, 10, pp. 939942.
    11. 11)
      • 5. Kildal, P-S., Rosengren, K.: ‘Correlation and capacity of MIMO systems and mutual coupling, radiation efficiency, and diversity gain of their antennas: simulations and measurements in a reverberation chamber’, IEEE Commun. Mag., 2004, 42, (12), pp. 104112.
    12. 12)
      • 4. Sharawi, M.S.: ‘Printed multi-band MIMO antenna systems and their merits’, IEEE Antennas Propag. Mag., 2013, 55, pp. 218232.
    13. 13)
      • 18. Cui, Y.H., Li, R.L., Fu, H.Z.: ‘A broadband dual-polarized planar antenna for 2G/3G/LTE base stations’, IEEE Trans. Antennas Propag., 2014, 62, (9), pp. 48364840.
    14. 14)
      • 8. Wong, K.L., Lu, J.Y., Chen, L.Y., et al: ‘8-antenna and 16-antenna arrays using the quad-antenna linear array as a building block for the 3.5-GHz LTE MIMO operation in the smartphone’, Microw. Opt. Technol. Lett., 2016, 58, (1), pp. 174181.
    15. 15)
      • 19. Mink, J.W.: ‘Circular ring microstrip antenna elements’. Antennas and Propagation Society Int. Symp., 1980, pp. 605608.
    16. 16)
      • 22. Tian, R.Y., Lau, B.L., Ying, Z.N.: ‘Multiplexing efficiency of MIMO antennas’, IEEE Antennas Wirel. Propag. Lett., 2011, 10, pp. 183186.
    17. 17)
      • 16. Arya, A.K., Anh, N.V., Aziz, R.S., et al: ‘Dual polarized dual antennas for 1.7–2.1 GHz LTE base stations’, IEEE Antennas Wirel. Propag. Lett., 2015, 14, pp. 14271430.
    18. 18)
      • 3. Li, H., Miers, Z.T., Lau, B.K.: ‘Design of orthogonal MIMO handset antennas based on characteristic mode manipulation at frequency bands below 1 GHz’, IEEE Trans. Antennas Propag., 2014, 62, (5), pp. 27562766.
    19. 19)
      • 20. Ding, Y., Zheng, Z.W., Feng, Z.H.: ‘A novel dual-band printed diversity antenna for mobile terminals’, IEEE Trans. Antennas Propag., 2007, 55, (7), pp. 20882096.
    20. 20)
      • 6. Al-Hadi, A.A., Ilvonen, J., Valkonen, R., et al: ‘Eight-element antenna array for diversity and MIMO mobile terminal in LTE 3500 MHz band’, Microw. Opt. Technol. Lett., 2014, 56, (6), pp. 13231327.
    21. 21)
      • 14. Sonkki, M., Antonino-Daviu, E., Cabedo-Fabres, M., et al: ‘Improved planar wideband antenna element and its usage in a mobile MIMO system’, IEEE Antennas Wirel. Propag. Lett., 2012, 11, pp. 826829.
    22. 22)
      • 10. Dietrich, C.B., Dietze, K., Nealy, J.R., et al: ‘Spatial, polarization, and pattern diversity for wireless handheld terminals’, IEEE Trans. Antennas Propag., 2001, 49, (9), pp. 12711281.

Related content

This is a required field
Please enter a valid email address