Hi all, In case of designing a 4 port MIMO antenna, while performing the simulation, is it necessary to check all the source magnitudes to 1, or is it ok, if I go with default settings where only 1 source is assigned magnitude 1 and rest all 0. which option is correct ? Does it have any effect on S parameters (reflection and isolation).
Second question, what if i need to calculate total gain of my MIMO antenna. For observing farfield radiation pattern, then should i assign magnitude as 1 for all the 4 sources? Or else just proceed with the default settings.
In response to the first part of your question: when simulating the antenna you should be looking at the active S-parameters which properly accounts for the coupling between the antennas. If you look at the active S-parameters it does not matter if the other ports are excited (source magnitude set to 1), it will account for that.
You need to understand the difference between an antenna array and MIMO antenna setup. In MIMO simulations you suppress mutual coupling which is correctly identified when only one antenna is excited and its effects is observed on the other antenna. For MIMO performance parameters you look for ECC in particular to check the level of mutual coupling. Secondly you also look for TARC which caters for the effects of all active antennas at same time. Since MIMO setup work in a different way you normally look for MEG of MIMO setup. For a multipath fading environment MEG represents the ratio of the power received by the MIMO antenna to the power received by an isotropic antenna thus you include radiating elements efficiencies along with S param to calculate MEG. Also DG is an important parameter which is not there for an array setup.
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