This paper proposes a broadband double-layer rectangular microstrip antenna(DL-RMSA) fed from the non-radiating edge of a bottom patch. The characteristics of the antenna has been analyzed via simulation tool. This design shows that cutting 3 to 5 slots along the co-polarization into the parasitic patch can effectively suppress the cross polarization radiation as well as enhances the impedance bandwidth. As compared to the conventional DL-RMSAs, the proposed antenna presents a 30% broader impedance bandwidth) while maintaining the cross polarization level. Using this antenna as an element in the construction of a corresponding array can simply the feed network and yield a co-planar-fed microstrip array with broad operation bandwidth, high radiation efficiency and wide-angle scanning capability. A X-band demo array of 8 X 8 elements has been fabricated and tested. The measurement results show that this array antenna exhibits low cross-polarization level and high radiation efficiency within a relative bandwidth of 17. 6%.%介绍了一种非辐射边馈电的宽带双层微带贴片天线单元,并对其参数特性进行了仿真研究,结果表明,通过在寄生贴片上开3～5个与极化方向相平行的缝,可有效抑制天线的交叉极化,同时改善天线的阻抗带宽.相比传统双层微带贴片,该天线单元的阻抗带宽可提高3％以上,而交叉极化指标相当.当该单元应用于阵列天线设计时,可简化馈电网络,便于实现宽带、高效、大扫描角的微带共面馈电天线阵.对X波段8×8单元实验小阵的测试结果表明,该天线在17.6％的频段内具有良好的交叉极化性能及较高的工作效率.
展开▼
