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A Compact 2-Element Symmetrically Fed MIMO Antenna with a Ground Isolation Stub for Ultra-Wideband Communication Systems

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Abstract

In this paper, a compact multiple-input multiple-output (MIMO) antenna, with a ground isolation stub for ultra wideband (UWB) communication systems, is presented. The proposed design is based on two symmetrical semi-circular patches, fed by stepped‐impedance microstrip lines, on the top side of the substrate, and a partial ground plane with two symmetrical large rectangular-shaped defected ground structure (DGS) units with a stub in between, and two symmetrical thin rectangular-shaped DGS units, on the bottom side. The two radiating elements are fed using a symmetrical feeding technique for future MIMO antenna systems. The 2-element UWB MIMO antenna with a simple structure and small size of 24 × 35 mm2 is printed on FR4 substrate material. This study has resulted in an impedance bandwidth from 3.3 to 20 GHz which insures that the UWB spectrum is properly covered. In addition to that the elements are well isolated due to the fact that the isolation coefficient is smaller than −20 dB for the whole range of frequencies. The proposed structure exhibits stable omni-directional patterns and nearly bidirectional patterns in both E- and H-planes with an increasing gain across the operation bandwidth. An acceptable agreement between measured and simulated S-parameters is obtained.

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All data generated or analyzed during this study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors would like to express their gratitude to Mrs. F. Mouhouche, University M’Hamed BOUGARA of Boumerdes, Institute of Electrical and Electronic Engineering, Signals and Systems Laboratory, for offering help and support during the implementation and measurement of the proposed antenna prototype.

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The author(s) received no financial support for the research, authorship, and/or publication of this article.

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  1. Signals and Systems Laboratory, Institute of Electrical and Electronic Engineering, University M’Hamed BOUGARA of Boumerdes, 35 000, Boumerdes, Algeria

    Fella Guichi & Mouloud Challal

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  1. Fella Guichi
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  2. Mouloud Challal
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Correspondence to Fella Guichi.

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Guichi, F., Challal, M. A Compact 2-Element Symmetrically Fed MIMO Antenna with a Ground Isolation Stub for Ultra-Wideband Communication Systems. Wireless Pers Commun 128, 131–146 (2023). https://doi.org/10.1007/s11277-022-09945-y

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