A double dipoles per cell structure for solving common-mode resonance in tightly coupled dipole array

A key challenge in designing tightly coupled dipole arrays (TCDAs) and connected arrays is common-mode resonance, which could dramatically influence the bandwidth. In this article, a double dipoles per cell structure is applied in TCDA unit design in order to solve the resonance by moving the resonance frequency above the operation band. The simulation results show that the double dipoles per cell structure reduces the common-mode resonance effectively and the array achieves 3:1 bandwidth (from 3GHz to 9GHz). When scanning in H-plane and E-plane, respectively, the array achieves 3GHz to 9GHz and 3.5GHz to 9.2GHz bandwidth with the scan angle up to 45°.