具有陷波特性的改进Sierpinski分形超宽带天线

摘要

为了避免WLAN窄带通信系统对超宽带通信系统的干扰,该文提出一种具有陷波特性的改进Sierpinski分形超宽带天线.天线的辐射单元是改进的4阶Sierpinski分形结构,通过采用共面波导馈电技术以及增加Sierpinski分形的迭代次数,可有效展宽天线的带宽,从而实现覆盖UWB(3.1~10.6 GHz)频段的宽频特性.在分形贴片上增加两个对称的L型开路枝节,实现了5.03~5.85 GHz频段的双陷波特性,能有效抑制WLAN频段对超宽带通信系统的干扰.天线的尺寸较小,仿真和实测结果表明天线可广泛适用于各种UWB通信系统.%Amodified Sierpinski fractal Ultra WideBand (UWB) antenna with band notch characteristic is proposed to refrain the interference from WLAN. The radiating path is the modified fourth order Sierpinski fractal structure. The bandwidth of the antenna is effectively expanded and can cover the bandwidth of UWB band (3.1~10.6 GHz) by using coplanar waveguide feed technology and increasing the number of iterations of Sierpinski fractal. The notch band characteristic in 5.03~5.85 GHz is realized by adding two symmetrical L-shaped stubs on the fractal path, which can effectively suppress the interference of WLAN. The antenna has a compact size, and the simulation and measurement results show that the antenna can be widely used in all kinds of UWB communication systems.