结构紧凑型宽带低副瓣阵列天线

Structural compact wideband low-sidelobe antenna array

为了满足系统对阵列天线宽带、低副瓣的要求,设计了一款工作在X和Ku波段的结构紧凑型宽带低副瓣阵列天线,相对带宽为54.5%,副瓣电平在-30 dB以下,天线纵向尺寸为4.5λg。阵列天线采用带状线加权馈电网络和宽带带状线偶极子天线一体化设计,偶极子天线用短路探针对馈电分布电容进行补偿并加载寄生贴片,有效展宽了带宽;馈电网络通过拓扑结构设计获得各功分节点最佳功率比值,对各功分节点位置合理布局缩减馈电网络纵向尺寸。在微波暗室利用近场测试系统对阵列天线实物进行测试,验证了仿真结果。

A structural compact wideband low sidelobe antenna array operating at X and Ku bands is designed for meeting the requirements of the electronic systems.The antenna array could achieve the relative bandwidth of 54.5%and the sidelobe level below-30 dB with the longitudinal dimension of 4.5λg.The array consists of 48 dipole elements and a stripline weighted power divider.To extend the bandwidth of the dipole element,a short-circuited probe at the end of the feeding stripline is employed to compensate distribution capacitive effect.A parasitic patch over the dipole is utilized to improve the radiation performance.To reduce longitudinal dimension of the array,the layout of the power divider is optimized according to the optimal power ratio of each node from the topology design.The experimentally validation is conducted in the near-field microwave anechoic chamber.