Fig. 6. The current vector in left-handed circular polarization at 28 GHz at (a) t=0; (b) t=T/4; (c) t=1/2T; (d) t=3T/4.
Conclusions: A new multiport interconnect ME dipole antenna array has been developed for 28-GHz band application. The proposed antenna array can be configured as a balanced antenna, a dual polarized antenna array or as circularly polarized antenna array through changing the phase of the input ports. It achieves a measured maximum realized gain of 13.52 dBi at 27 GHz, a 10-dB impedance bandwidth of 12.8 %, and a 3-dB gain bandwidth of 14.29% at 28 GHz as under one balanced port excitation. Lower than -15dB isolation between two balanced ports is achieved for dual polarization applications. Circular polarization has been realized by feeding the input ports with the same amplitude and a phase difference of 90o. A measured maximum realized gain of 12.15 dBi at 27 GHz, a 10-dB impedance bandwidth of 28.57 %, a 3-dB gain bandwidth of 24.11% and a 3-dB axial ratio bandwidth of 16% is achieved for circular polarization. The proposed multiport interconnect ME dipole antenna array not only has the advantage of the conventional ME dipole antenna arrays, such as low profile, light weight and high gain, but also enlarge the polarization diversity and design flexibility of the system.
Acknowledgments: This research was funded in part by the National Natural Science Foundation of China under Grant 61901139, 62001140, in part by Shenzhen Science and Technology Program under Grant KQTD20210811090116029, in part by the National Key Research and Development Program of China under Grant 2020YFB1807303, and in part by the Shenzhen Basic Research Program under Grant GXWD20201230155427003-20200824201212001.
Conflict of interest : The authors declare no conflict of interest.
Data availability statement : The data that support the findings of this study are available upon request from the corresponding author.
 2021 The Authors. Electronics Letters published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Received: xx January 2021 Accepted: xx March 2021
doi: 10.1049/ell2.10001
References
  1. A. Osseiran et al.:Scenarios for 5G mobile and wireless communications: The vision of the METIS project. IEEE Commun. Mag., vol. 52, no. 5, pp. 26–35, May 2014.
  2. S. Sadeghi-Marasht, M. S. Sharawi and A. Zhu: Dual-band circularly polarized antenna array for 5G millimeter-wave applications.IEEE Open Journal of Antennas and Propagation , vol. 3, pp. 314-323, 2022.
  3. H. Li, Y. Cheng, L. Mei and F. Wu: Dual-polarized frame-integrated slot arrays for 5G mobile handsets. IEEE Antennas and Wireless Propagation Letters , vol. 19, no. 11, pp. 1953-1957, Nov. 2020.
  4. Z. Gan and Z. -H. Tu: Dual-mode conjoint patch-pair for 5G wideband patch antenna array application. IEEE Antennas and Wireless Propagation Letters , vol. 20, no. 2, pp. 244-248, Feb. 2021.
  5. I. Herrero-Sebastián and C. Benavente-Peces: Wideband SIW slot-array design based on reflection-slope-synthesis method for 5G services.IEEE Antennas and Wireless Propagation Letters , vol. 19, no. 12, pp. 2082-2086, Dec. 2020.
  6. K. M. Luk and H. Wong: A new wideband unidirectional antenna element.Int. J. Microw. Opt. Technol. , vol. 1, no. 1, pp. 35–44, Jun. 2006.
  7. Y. Li and K. -M. Luk: 60-GHz dual-polarized two-dimensional switch-beam wideband antenna array of aperture-coupled magneto-electric dipoles. IEEE Transactions on Antennas and Propagation , vol. 64, no. 2, pp. 554-563, Feb. 2016.
  8. Y. Li and K. -M. Luk: A 60-GHz wideband circularly polarized aperture-coupled magneto-electric dipole antenna array. EEE Transactions on Antennas and Propagation , vol. 64, no. 4, pp. 1325-1333, April 2016。
  9. X. Dai and K. M. Luk: A Wideband dual-polarized antenna for millimeter-wave applications. IEEE Transactions on Antennas and Propagation , vol. 69, no. 4, pp. 2380-2385, April 2021.
  10. X. Ruan and C. H. Chan: A circularly polarized differentially fed transmission-line-excited magnetoelectric dipole antenna array for 5G Applications. IEEE Transactions on Antennas and Propagation , vol. 67, no. 3, pp. 2002-2007, March 2019.