一种新型双陷波超宽带天线设计

Design of a Novel Planar Ultra-wideband Antenna with Dual Band-Notched Characteristics

设计了一种新型双陷波超宽带印刷天线。辐射贴片底部为梯形结构,实现了良好的阻抗匹配。通过在贴片上加载两个U型缝隙,分别在中心频率3.5GHz和5.5GHz处产生陷波。比较陷波前后天线表面电流密度,并用传输线理论对陷波产生机理进行了分析。天线实测与仿真结果吻合,通带内天线辐射效果良好,陷波频段内增益下降超过5dB,达到了陷波抑制的效果。

A novel planar ultra-wideband antenna with dual band-notched characteristics is proposed.With the trapeziform structure at the bottom of radiating patch,good impedance match can be achieved.Meanwhile,two U-shaped slots are embeded into the radiating patch,to obtain the notched bands at the frequency of 3.5GHz and 5.5GHz.With and without the notched structure,the change of the current density on the surface of antenna is compared,and the cause of notched band is analyzed with the transmission line theory.The simulated and measured results show that the antenna has a good radiating characteristic within the transmission band.The gain of the antenna within the notched band has been reduced by 5dB by contrast with that within the transmission band.