Uncoupled impedance matching for coupled multi-antenna systems

Optimal impedance matching to a coupled antenna array requires implementation of a coupled load or matching network, leading to high complexity and in many cases narrow bandwidth. Research has therefore focused on the development of uncoupled matching networks with good performance, although such solutions have received little rigorous attention in the context of multiple-input multiple-output communication. This paper explores uncoupled impedance matching to the array active and passive impedances for multi-antenna communications and extends matching to the array active impedance to the case where the propagating field is specified stochastically. Simulations demonstrate the relative performance of the different matching techniques.