Study of Excitation on Beam Ports versus Element Ports in Performance Evaluation of Diversity and MIMO Arrays

Abstract:
The main concern of the current communication is to elicit the influences of beam-forming upon different Multiple-Input Multiple-Output (MIMO) parameters in a rich scattering environment. A detailed study of desired parameters is presented with particular stress on total radiation efficiencies observed on Element ports and Beam ports. Measurements are performed in a Reverberation Chamber (RC). The results illustrate that performance as viewed through Element and Beam ports are, in general, equal. Hence, they confirm that in a rich and isotropic scattering environment, beam-forming technique does not prove beneficial. They also demonstrate that as long as received radiation power is preserved, the shapes of the elements’ patterns are irrelevant.