Author(s):
Shailesh, Abhishek Kumar, Jyotsna Gaur, Amit Birwal, and Kamlesh Patel

Abstract:
This work investigates the effects of different loads on the diversity parameters of a multiband multiple-input multiple-output (MIMO) antenna. The unused ports of a 4-port multiband MIMO antenna are terminated with a matched load, an open load, or a short load when exciting one or two ports. The diversity parameters of MIMO antenna, such as Envelope Correlation Coefficient (ECC), Diversity Gain (DG), Total Active Reflection Coefficient (TARC), and Mean Effective Gain (MEG), are calculated using S-parameters. The maximum ECC values are 0.311, 0.314, and 0.302, and the minimum TARC values are -8.272 dB, -8.223 dB, and -8.035 dB, respectively, in the operating bands for these three loads. The DG is approximately 10 dB, and the MEG ratios are within ±3 dB across 4-6 GHz for the three different loads. Generally, the open load shows weak participation, while the short load offers strong coupling and severe diversity degradation. In the present study, the effects of these different loads are found to be negligible on the diversity parameters of the multiband MIMO antenna.

Pages: 946-953

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