Minimization of Mutual Coupling Interferences Between Nearby Antenna Arrays to Retain Their Beam Steering Functionality

This paper presents an effective excitation synthesis algorithm of phased arrays of antennas to optimize the radiation patterns under minimum mutual coupling/induction interferences between two nearby arrays. The optimization goal is to minimize the inter-array interferences in an attempt to retain their radiation beam characteristics. Furthermore, a cost function is defined to reduce the inter-array reaction and the excitation weighting deviations from the desired ones for directional beam radiations by embedding a coupling reduction factor (CRF). The resulting solutions are in a simple closed-form for easy implementation. Besides, the mutual coupling/induction mechanisms are effectively interpreted using the singular-value decomposition (SVD) method to create an eigenspace for signal representations and the complementary null space. Finally, theoretical and numerical full-wave simulation examples are presented to validate the proposed mutual coupling/induction suppression method.