共面波导边缘结构的平面单极子天线  

Planar monopole antenna based on the fringe structure of coplanar waveguide

作　　者：邓超[1,2] 谢拥军[1] 

机构地区：[1]西安电子科技大学天线与微波技术重点实验室,陕西西安710071 [2]武警工程学院,陕西西安710086

出　　处：《重庆大学学报（自然科学版）》2010年第12期114-118,共5页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(60771040);教育总新世纪优秀人才资助项目(NCET-04-0950)

摘　　要：共面波导与微带线相比具有较低的损耗,并易于与其它电路结构集成。传统共面波导馈电的矩形单极子天线频带较窄。为了展宽天线带宽在矩形贴片底部开槽,并将共面波导的中心导带延伸至凹槽顶端进行馈电。将凹槽的顶端和共面波导的一部分地面设计成渐变结构,并通过在凹槽中插入阶梯结构对天线的输入阻抗进行调整。仿真结果表明,新型结构可将天线带宽由原来84.8%展宽到167.2%(频率范围为:2.17GHz～24.3GHz,S11≤-10dB)。实际测试结果与仿真值吻合良好。该天线具有近似全向的辐射特性,适合于便携式超宽带通信系统。Coplanar waveguide possesses the advantage of lower loss and being easier to be integrated with other circuits comparing with the microstrip line. However,the bandwidth of the fed rectangular monopole antenna of the conventional coplanar is narrow. To broaden the bandwidth,the patch is notched on the bottom,and the central strip of the coplanar waveguide is prolonged to the groove top for feed. Both of the edges of a part of the coplanar ground and the groove top followed gradual regularity,and a ladder configuration is inserted into the groove to adjust the input impedance. Simulation indicates that the fractional bandwidths of the antennas can be broadened from 84.8% to 167.2%（a coverage of 2.17~24.3 GHz,S11≤-10 dB）in this way. The measured results agree well with the simulated ones. The radiation pattern of the antenna is nearly omnidirectional,which can be used in portable UWB communication systems.

关 键 词：单极子天线 超宽带天线 矩形单极子 平面天线 

分 类 号：TN822.8[电子电信—信息与通信工程]