用于卫星通信的Ku波段宽带双频双极化微带天线阵

Wideband dual-frequency and dual-polarization microstrip antenna array at Ku-band for satellite communications

利用口径耦合馈电、错位倒相馈网技术和单层微带贴片结构设计出一种用于卫星通信的Ku波段宽带双频双极化微带四元天线阵。用电磁仿真软件CST2008对天线阵的电特性进行了仿真和优化。四元天线阵实测结果表明:水平极化端口在11.21GHz～13.47GHz频率范围内VSWR燮1.5,相对阻抗带宽为18.3%;垂直极化端口在13.43GHz～14.88GHz频率范围内VSWR燮1.5,相对阻抗带宽为10.24%。工作频带内两端口隔离度<-35dB,最大增益为13.2dB,与仿真结果一致。

In this paper, a wideband dual-frequency and dual-polarization microstrip antenna of four-element array at Ku- band for satellite communications is described, which is based on aperture-coupled feeding, anti-phase feeding technique and single-layer mierostrip patch structure. The parameters of antenna are simulated and optimized by the simulator of CST2008. From the measurement results of four element array antenna： the relative impedance bandwidths are 18.3% from 11.21 GHz to 13.47 GHz for horizontal polarization channels and 10.24% from 13.43 GHz to 14.88 GHz for vertical polarization channels, which 1.5 are obtained, respectively. The isolation between the two ports is less than -35 dB across the entire operating bandwidth, the maximum gain is about 13.2 dB, which agrees well with the simulated ones.