Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
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By S. Zhang, K. Zhao, B. Zhu, Z. Ying, and S. He

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MIMO reference antennas are proposed for over the air (OTA) measurement applications. The reference antennas could get rid of feeding cable interference and control envelope correlation coefficients (ECC) continuously by only changing the length of an etched slot on a dual-feed PIFA. If only the ECC is investigated, the MIMO reference antenna is optimized to have a small variation of total efficiency from 70% to 50% when the ECC increases from 0.1 to 0.88. The prototypes are fabricated and measured in a scattered field chamber (SFC). Measurements agree well with the simulations. A practical example of applying this kind of reference antenna is provided. If the MIMO performance is studied, the MIMO reference antenna is proposed to own a large variation of total efficiencies from 90% to 47% while the ECC increases from 0 to 0.98. The bandwidth of the proposed reference antennas depend on the size of the antennas. This method is valid for all the frequencies.

S. Zhang, K. Zhao, B. Zhu, Z. Ying, and S. He, "MIMO Reference Antennas with Controllable Correlations and Total Efficiencies," Progress In Electromagnetics Research, Vol. 145, 115-121, 2014.

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