背腔式缝隙天线混合方法降耦研究  

Research on Reducing Mutual Coupling of Cavity-Backed Slot Antennas Using Hybrid Method

作　　者：张琪春[1] 张金栋[1] 吴文[1] 方大纲[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院,南京210094

出　　处：《微波学报》2015年第3期36-39,共4页Journal of Microwaves

摘　　要：运用混合降耦方法,提出了一种简单但高效率的减小背腔式缝隙天线耦合的结构,通过放置两对称寄生单元和去介质的降耦方法,经点频优化,与无附加结构的天线相比,在反射系数小于-10d B的1.7%带宽范围内(中心频率为12GHz)互耦降低了9.7d B,天线的方向图得到了改善,端射方向的能量减小。在点频优化的基础上,通过带宽内的优化进一步改善了耦合性能,在反射系数小于-10d B的2.2%带宽范围内互耦降低了11.5d B。该降耦方法结构简单、成本低、易加工。A simple but high efficient approach of reducing the mutual coupling is proposed for dual-element cavitybacked slot antennas using hybrid reducing mutual coupling method. By inserting two symmetrical parasitic elements and removing part of the substrate between two coupled slot antennas,the mutual coupling reduction of 9. 7d B is achieved in the bandwidth of 1. 7%( at the central frequency of 12GHz) with reflection coefficient less than- 10 d B through the optimization for single frequency. Meanwhile,radiation patterns are improved than those of normal antennas and end-fire radiation is reduced. Based on the optimization for single frequency,the mutual coupling is improved through the optimization in the bandwidth,the mutual coupling reduction of 11. 5d B is achieved in the bandwidth of 2. 2% with reflection coefficient less than- 10 d B. The features of this hybrid method include very simple structure,low cost,easy fabrication.

关 键 词：背腔式缝隙天线 降耦 寄生贴片 混合方法 

分 类 号：TN823.24[电子电信—信息与通信工程]