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
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