An Upper Bound on Antenna Near-Field Deviations Caused by Mutual Coupling for Applications in Optimization Design Methods

The present letter studies the impact of electromagnetic mutual coupling on the near fields of generic antenna systems. The main objective here is to derive an upper bound on near-fields deviations caused by mutual coupling. The method transforms the problem of near-field coupling from the near zone to the recently introduced antenna current Green's function defined on the antenna itself. Through this upper bound, the formulation presented here can be used to develop automatic algorithms for the design of coupled antenna systems with optimum near-field performance. Numerical examples involving linear wire arrays are given to demonstrate and confirm the approach proposed here.