一种双陷波超宽带天线设计与研究

Design and Analysis of a Dual Band-notched UWB Antenna

为了避免如WiMax和WLAN等窄带通信系统对超宽带通信系统的影响，该文提出一种具有双陷波特性的超宽带天线。该天线采用圆形贴片作为辐射单元，通过在贴片和接地板上分别开圆弧状的H形槽和L形槽来实现双陷波特性。天线在3.1~10.6 GHz的超宽带频段内能够有效地工作并抑制两种不同的窄带通信系统的干扰。同时圆弧状 H 形槽的参数研究表明，这种开槽结构能够以槽参数组合的形式更有效地控制陷波中心频率。实测和仿真结果吻合，该天线实现了良好的陷波功能，在工作频段内有良好的辐射方向特性。

A dual band-notched UltraWide Band （UWB） antenna is presented to avoid the interference of service that work in the UWB band such as WiMax and WLAN applications. The dual band-notched characteristics are achieved by employing an arc H-shaped slot on the radiating patch and etching a couple of L-shaped slots on the ground plane. The proposed antenna operates on the ultra wide band （3.1~10.6 GHz） efficiently, except for the bandwidth of 3.3~3.6 GHz for WiMax application and 5.1~5.9 GHz for WLAN application. The parametric study of the arc H-shaped slot shows that this structure enables centre frequency of notched band to be conveniently tuned. Simulated and measured results show that the proposed antenna provides excellent band-notched function on the rejectband and has nearly omnidirectional radiation patterns on the passband.