Ku波段宽带双频双极化微带天线阵.PDFVIP

Ku 波段宽带双频双极化微带天线阵 徐永杰 1 姜 兴 2 (桂林电子科技大学信息与通信学院, 桂林 541004) 摘 要：综合运用了缝隙耦合馈电技术、双线馈线技术和引入空气层等方式展宽了天线的频带，设计出一种 工作在 Ku 波段宽带双频双极化微带二元天线阵。利用反相馈电抑制了高次模的耦合激励，降低了交叉极化 电平，提高了两个极化端口的隔离度。用三维电磁场仿真软件 CST2008 对天线阵的电特性进行了仿真和优化， 实测结果和仿真结果吻合较好。实测结果表明：水平极化端口在 11GHz ～14.2GHz 频率范围内回波损耗小于 -15dB，相对阻抗带宽为25.4%；垂直极化端口在 13GHz ～15GHz 频率范围内回波损耗小于-15dB ，相对阻抗 带宽为 14.3%。两个极化端口隔离度小于-30dB ，最大增益为 10.7dBi。 关键词：宽带，双频双极化，缝隙耦合馈电，微带天线 Wideband Dual-frequency and Dual-polarization Microstrip Antenna Array at Ku-band Xu Yongjie1 Jiang Xing 2 (School of Information and Communication Engineering , Guilin University of Electronic Technology ,Guilin 541004) Abstrate: A wideband dual-frequency and dual-polarization microstrip antenna of two-element array at Ku-band is described in this paper. The aperture-coupled feeding, dual-lines feeding and inserting of the air layer technologies are adopted to achieve wider bandwidths.The method of anti-phase feeding technique that contributing to suppress the higher order modes ,decrease of cross-polarization and improve the isolation between two polarization ports is also applyed. The parameters of antenna are simulated and optimized by the simulator of CST2008, The measured results are in good agreement with the calculated ones. The measurement results show that the relative impedance bandwidths are 25.4% from 11GHz to 14.2GHz for horizontal polarization channels and 14.3% from 13GHz to 15GHz for vertical polarization channels, which return loss less than -15dB are obtained ,respectively. The isolation between the two ports is less than -30dB across the entire operating bandwidth, the maximum gain is about10.7dBi. Keywords: Wideband; Dual-frequency and Dual-polarization; Aperture-coupled feeding; Microstrip antenna 离度[1, 2]，但带宽较窄。为了