多层带状线和差一体化网络的实现

Realization of Multilayer Stripline Sum-difference Unified Network

针对相控阵天线复杂的馈电网络问题,介绍了一种多层带状线和差一体化网络的工程实现方法。网络采用多层和差一体化设计理念,与传统的和差网络设计相比,消减了金属盒体和同轴电缆的使用,有效地解决了传统复杂的馈电网络形式。通过对宽带和差器和威尔金森功分器的独立设计,结合同轴电连接器的使用,使在该网络强迫馈电下的天线阵在20%的工作频带内获得了和波束副瓣电平<-30 d B,差波束副瓣电平<-20 d B的低副瓣特性。网络具有集成度高、可靠性高和成本低的特点,目前已成功应用于相控阵雷达天线。

To address the issue of complex feeding network in phased array antenna,an engineering realization method of multilay-er stripline sum-difference unified network is introduced in this paper.The design concept of multilayer sum-difference unification is used in the network which can reduce the complexity of feeding network with reduced use of metal cavity and coaxial cable as compared with traditional sum-difference network.By a separate design of the wideband sum-difference network and the Wilkinson divider as well as the use of coaxial connector,the sum beam sidelobe level is reduced to -30 dB and the difference beam sidelobe level -20 dB in 20% operating frequency band,which means a low sidelobe characteristic is realized in antenna array.This high-integration,high-relia-bility and low-cost network has already been applied to phased array antenna successfully.