设计了一种超宽带紧耦合天线阵列,该超宽带天线由两层印刷有偶极子单元的周期结构构成,上层互不相连的偶极子单元为寄生层,下层在E 面增加了强耦合结构的偶极子单元为辐射单元层。馈电网络由Marchaned 巴伦和宽带Wilkinson 功分器组成。仿真结果表明:天线法向辐射时在0.9 GHz ~4.8 GHz 内具有良好的阻抗匹配带宽(VSWR<2),在1 GHz ~4 GHz频段内可以实现E 面60度、H 面45度的扫描范围。该天线具有超带宽、大扫描角、轻薄化等特点,在超宽带小型化相控阵天线中有良好应用前景。

A ultra-wideband tightly coupled array is proposed. The antenna consists of two layers of printed dipole unit. The disconnected dipole located in the top is parasitic layer . The unit that is increased the coupling structure at E-plane is radiation lay.Feed network is composed of Marchaned balun and broadband Wilkinson power dividers. The simulation results show that the antenna achieves 0 . 9 GHz ~ 4 . 8 GHz bandwidth for VSWR < 2 , andhave E-plane 60 ^o, H -plane 45 ^oscanning range in 1 GHz ~ 4 GHz. This antenna has characteristic of broad bandwidth, large scan angle, and lightweight , which can be applied to small ultra-wideband phased antenna array system.

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