Abstract
A band-enhanced and low-profile tightly coupled array (TCA) with inductive windows (IWs) and split rings (SRs) is proposed in this paper. The IW cell is placed between the antenna plane and ground and consists of four parallel strips which introduces inductance to move the resonance frequency caused by the ground out of the operating band. Moreover, the SR is specially designed to thin the thick wide-angle impedance matching (WAIM) superstrates to reduce the TCA profile height. As a result, the proposed array has a 10:1 impedance bandwidth (0.6-6 GHz) with the active VSWR<3.0 and more than 90% radiation efficiency at broadside. The bandwidth reduces to 8.8:1 (0.7-6.2 GHz) when scanning to ±60° in E/D-plane and ±45° in H-plane, respectively. The profile height of the TCA with IWs and SRs is only 0.077λL with the distance of 0.5λH between the adjacent elements.
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