A Method of Reducing Mutual Coupling for a Finite Array

A method of reducing mutual coupling for a finite array with the characteristics of wideband and beam steering is presented in this paper. By adding an extra decoupling network, the mutual coupling can be efficiently suppressed for the antenna array. To verify the validity of the proposed method, a 1 × 8 millimeter-wave array antenna based on the gap waveguide technology is used in this work. The simulation results show that the active reflection coefficients are improved from −6.98 dB to −8.29dB, and the mutual coupling between adjacent elements is reduced to below −16.73 dB covering 20-33 GHz with the beam steering angle range of ±70°.