中文摘要：

文章设计了一种新颖的超宽带天线，天线结构简单、尺寸小并且具有双陷波特性。在接地板上刻蚀1个半圆形口径，该口径带有3个阶梯形缺口，以此激发一个新的谐振频率，从而拓展天线的阻抗带宽；在方形辐射贴片上加载开口圆环，同时在馈线上开U形槽，以获得双陷波特性。仿真和测试结果表明，该天线可以有效地抑制WiMax、C波段卫星通信和WLAN 3种窄带信号的干扰；对开口圆环的参数研究表明，开槽结构能更灵活地控制陷波中心频率；该天线在陷波频段外具有良好的增益和全向辐射特性，满足超宽带通信系统的应用。

英文摘要：

In this paper ,a novel ultra‐wideband（UWB） antenna is designed ,which has the properties of simple structure ,small size and dual band‐notched function .By etching a semi‐circle‐shaped aperture with three not‐ched‐steps on the ground ,additional resonance is excited ,and hence much wider impedance bandwidth can be produced .To generate the dual band‐notched characteristic ,a split ring slot is employed on the radiation ele‐ment and a U‐shaped slit is added on the microstrip line .The results of simulation and measurement show that the proposed antenna efficiently restrains the interference from narrow‐band communication system ,in‐cluding WiMax ,C‐band satellite communication and WLAN .The parametric study of the spilt ring slot indi‐cates that this structure can more flexibly control the central frequency of notched band .In addition ,the de‐signed antenna achieves a good gain and exhibits omnidirectional radiation patterns except at notched band , which make it suitable for UWB applications .