基于开窗结构和寄生单元的双陷波超宽带天线

Dual Band-notched Ultra-wideband Antenna Based on Slots and Parasitic Elements

设计了一种具有双陷波特性的平面超宽带天线。超宽带基础天线的馈电采用渐变式阶梯阻抗匹配结构作,使得天线具有了宽阻抗匹配能力。通过在椭形辐射器内进行开窗,以及在地面添加矩形寄生单元,实现了天线的双陷波特性。测试结果表明,该天线的工作带宽（VSWR〈2）为3.1-10 GHz,工作在超宽带（UWB）频率范围,两个陷波分别在3.3-4.0 GHz和5.0-5.85 GHz,可以应用于Wi MAX和WLAN频段的信号抑制。仿真与实测结果表明,该天线结构简单、实现了良好的陷波功能,能够较好地应用于超宽带通信系统中。

A planar monopole UWB antenna with dual band notched characteristic is proposed. The UWB base antenna has a wide impedance matching characteristic with the gradually stepped impedance feeder. By opening slots on the antenna and embedding a pair of rectangular shaped parasitic elements on the ground, the dual band-notched characteristic can be obtained respectively. The measured results show that the proposed antenna achieved a wide bandwidth of 3 - 11 GHz with VSWR 〈 2, stop bands of 3.3 - 4.0 GHz for WiMAX and 5.0 - 5.85 GHz for WLAN. Both the simulated and measured results show that the proposed antenna has the advan.tages of simple structure and good band-notched function on the stop band, thus a good candidate for various UWB applications.