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High Isolation Compact UWB MIMO Antennas

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Abstract

In this work, two elements and four elements compact UWB MIMO antennas are designed and fabricated. A printed circular disc with five circular slots is selected in this work due to its UWB performance and compact size for the MIMO antenna system. CST software is used in the simulation process. Measured S parameters show that the MIMO antennas work well from 3 GHz up to 20 GHz (maximum working frequency of the measurement instruments). The two elements MIMO antenna has a size of 70 × 40 mm2 meanwhile the four elements MIMO antenna has a size of 70 × 70 mm2. Measurement results show that the isolation among the antenna elements is higher than 20 dB. The envelope correlation coefficient, diversity gain, channel capacity loss, mean effective gain and total active reflection coefficient are studied in this paper. Simulations results show that the MIMO antennas have a satisfactory performance up to 50 GHz.

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Datasets are analyzed during this research work are not available publicly due to future scope of research.

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  1. Escuela Ploitecnica Superior, Universidad Autonoma de Madrid, 28049, Madrid, Spain

    Bazil Taha Ahmed

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  1. Bazil Taha Ahmed
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Appendix

Appendix

Figure 23 shows the simulated S11 and S21 of the two elements UWB antenna with maximum simulation frequency of 50 GHz. It can be seen that the impedance-working band of the antenna with S11 lower than − 10 dB is 2.65 up to 50 GHz. For the same band, S21 is lower than − 20 dB.

Fig. 23
figure 23

Simulated S11 and S21 of the two elements UWB antenna with maximum simulation frequency of 50 GHz

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Figure 24 shows the simulated S11, S21, S31 and S41 of the four elements UWB antenna with maximum simulation frequency of 50 GHz. It can be noticed that the impedance-working band of the antenna with S11 lower than − 10 dB is 3.05 up to 50 GHz. For the same band, S21, S31 and S41 are lower than − 20 dB.

Fig. 24
figure 24

Simulated S11, S21, S31 and S41 of the four elements UWB antenna with maximum simulation frequency of 50 GHz

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Ahmed, B.T. High Isolation Compact UWB MIMO Antennas. Wireless Pers Commun 128, 3003–3029 (2023). https://doi.org/10.1007/s11277-022-10083-8

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