具有带阻特性的新型超宽带天线研究

具有带阻特性的新型超宽带天线研究

内容简介：据短距离无线电通信系统对超宽带天线的要求,提出了一种新型的具有带阻特性的印刷超宽带天线。采用在辐射贴片传输线旁边加上2个U形寄生单元来实现天线的带阻特性,天线的辐射贴片与接地板具有一致的结构,使得天线的辐射方向图与偶极子天线非常类似。对U形寄生单元的各个参数对带阻性能的影响进行了研究,仿真结果表明可以方便的通过改变寄生单元的尺寸和位置来改变阻带的位置和宽度。可实现天线频带宽度(S11≤-10 dB)3.5 GHz~14.6 GHz,相对带宽达123%,并实现了4.9 Ghz~6.1 GHz的阻带特性,实验结果表明该天线适用于超宽带系统的应用。

Abstract：A new printed UWB antenna with a band notched characteristics is proposed according to the requirement of short distance communication for UWB antenna. The band-stop characteristic is achieved by two U-shaped parasitic elements beside the feeding line of the radiation patch. The radiation patch and the ground are with the same structure and the radiation pattern of the proposed antenna is similar to the dipole antenna. A detailed parametric study of the U-shaped parasitic element is presented. Simulated results show that the size and the position of the parasitic element determine the center frequency and the bandwidth of the notched band. With the presented design, the bandwidth (return loss≤-10 dB)starts from 3. 5 GHz up to 14. 6 GHz that means a relative bandwidth of 123% with a notched band from 4. 9 to 6. 1 GHz. Measured results confirm that the proposed antenna is suitable for UWB applications.

作者：胡少文, 吴毅强, 张云, 张平平, 周辉林,

关键词：超宽带, U形寄生单元, 带阻功能, 微带馈电,