Is 20 dB isolation rule of thumb sufficient when evaluating the performance of wireless MIMO antennas?

RAN
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When evaluating the performance of wireless MIMO antennas, you may often hear the rule of thumb: 20 dB isolation is sufficient.

But why is this number so significant?

The answer lies in the Envelope Correlation Coefficient (ECC).

ECC is metric for measuring antenna correlation (less correlation means better performance for MIMO systems), derived from the S parameters of the antennas.

Plot below illustrates a key point: For a good antenna design (return loss of around 10 dB), the ECC curve stabilises once the isolation between MIMO antennas reaches 20 dB.

20 dB isolation
20 dB isolation1918×1144 147 KB

LinkedIn (source): :point_down:

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