一种宽带缝隙耦合微带天线阵列的设计北大核心CSCD

微带阵列天线具有增益高、剖面低、体积小、重量轻、成本低、易共形等优势,为了克服其频带窄、交叉极化强的问题,文中采用偏置缝隙耦合馈电、上层贴片、并馈网络等措施设计了宽带多层微带阵列天线。在等效电路分析基础上,结合仿真验证,分析了关键参数对天线单元阻抗匹配的影响,得出了单元最佳结构尺寸。采用了灵活的等功分并馈网络实现了8×8布局、45°极化的微带阵列天线。仿真和实测结果表明:电压驻波比VSWR<2的阻抗带宽达到48.8%,半功率波束宽度HPBW>9.2°时增益大于18 dB,交叉极化电平低于-22 dB,同时具备较深的零深、较低的副瓣电平。

Design of a Wide-Band Aperture-Coupled Microstrip Antenna Array

Microstrip antenna array has the advantages of high gain, low profile, small volume, light weight, low cost and flexible conformability. While, in order to overcome the problems of narrow bandwidth and strong cross polarization of microstrip antenna, this paper designs a broadband multilayer microstrip array by adopting offset-aperture coupling feed, parasitic patch and parallel feeding network. Based on equivalent circuit analysis and simulation verification, the influence of key parameters on impedance matching of antenna element is gotten, and the optimal structure size of antenna element is obtained. An 8×8 microstrip array with 45°polarization is realized, using a masterly parallel feeding network with power equally divided. Simulated and measured results show, for the array, the impedance bandwidth with VSWR < 2 reaches 48. 8%, the gain with HPBW > 9. 2° is greater than 18 dB, the low cross-polarization level is lower than -22 dB, and it has deep zero depth and low side lobe level.