具有带阻特性的印刷U型超宽带天线设计

摘要

本文设计制作了一种具有带阻特性的印刷U型超宽带微带天线。采用在接地面上开一个矩形槽来实现天线的带阻特性，通过改变矩形槽的长度和宽度可以调节阻带宽度，并对阻抗和辐射特性进行了讨论。仿真结果表明，可以通过改变矩形槽的宽度来改变阻带的位置和宽度，可实现天线频带宽度（S11≤-10 dB）为2.8～10.5 GHz，相对带宽达116%，并能精确阻隔WLAN（5.725～5.85GHz）频率段。实验结果表明该天线适用于超宽带系统的应用。%This paper designs a printed U shaped ultra wideband microstrip antenna with band-notched char-acteristic which is implemented by opening a rectangular slot on the ground plane. We can adjust the width of the band by changing the length and width of the rectangular slot. The paper then discusses the impedance and radia-tion characteristics. Simulation results show that the width of the rectangular-shaped slot can determine the center frequency and the bandwidth of the notched band. With the presented design, we can keep the bandwidth ( S11≤-10 dB) between 2.8GHz and 10.5GHz, that means a relative bandwidth of 116%and it can effectively eliminate the 5.725~5.85GHz WLAN range. Experimental results show that the proposed antenna is suitable for UWB appli-cations.