高隔离度双极化微带天线直线阵的设计

Design of a Dual-Polarized Linear Microstrip Antenna Array with High Isolation

本文介绍一种新型的 1× 16双极化微带天线直线阵的设计 .该天线采用双极化角馈方形贴片单元 ,阵列的垂直极化端口采用共面馈电 ,水平极化端口采用口径耦合 ,并在馈电网络中应用反相馈电技术 .实验结果表明 ,天线二端口驻波比小于 1.5的相对带宽分别达到 15 %和 13.5 % ,两端口之间的隔离度在频带内高于 33dB ,最大达到4 3dB .本直线阵可用作星载综合口径雷达系统的天线子阵 ,便于与有源收发器件结合 .

The design of a novel 1 × 16 dual-polarized linear microstrip antenna array is introduced. The element is the dual-polarized corner-fed square patch, while the vertical polarization port of the array is fed with a coplanar feed, and its horizontal polarization port is fed with the aperture-coupled feed. In addition, the pair-wise anti-phase feeding technique is used in both feed networks. The experimental results show that the bandwidths of VSWR < 1.5 reach 15% and 13.5% for the two ports, respectively, and the isolation between the dual polarized ports is better than 33 dB within the operating bandwidth, whose maximum reaches 43 dB. This linear array can be used as a sub-array of spaceborne synthetic aperture radar (SAR) system by connecting it with the active transmitter/receiver (T/R) components.