基于紧耦合结构的平面宽带阵列天线设计

Design of A Planar Wideband Array Antenna Based on Tight Coupling Structure

基于紧耦合结构设计了一种宽带阵列天线,该天线单元由两层印刷偶极子构成,采用非平衡馈电形式,偶极子臂两端接地以抑制共模激励。仿真结果表明,在无限大阵列中天线在6~18 GHz内具有良好的阻抗匹配带宽(电压驻波比(VSWR)<2.1),且在该频段范围内可以实现E面、H面45°扫描。对有限9×9×2阵列进行仿真验证,在工作带宽内其VSWR<3,E面、H面有源驻波小于4时其扫描角可达45°。

In this paper,a wideband array antenna is designed based on tight coupling structure.The antenna element is composed of two dipoles printed on different layer with unbalance feed mode.To suppress the common model excitation,dipole arms are connected with the earth.The simulation results show that,in the infinite array,the antenna has well impedance matching bandwidth,voltage standing wave ratio(VSWR)is less than 2.1 in 6~18 GHz,and in the frequency scope,it can realize the scanning to E-plane,H-plane in 45°range.The simulation validation is performed to limit array 9×9×2,and VSWR is less than 3 in operating bandwidth,the scanning angle can reach 45°when the active standing wave is less than 4 in E-plane and H-plane.