共面波导馈电平面小型化超宽带天线设计

摘要

The operating frequency band of ultra-wideband ( UWB ) systems overlap with the frequency bands of existing narrowband systems such as world interoperability for microwave access(WiMAX) and wireless local area network (WLAN), which can cause systems to interfere with each other. In order to effectively suppress the interference of the existing narrowband system to the UWB communication system, on the basis of the monopole antenna, an UWB antenna having double notch is designed by slotting a rectangular radiating patch with an L-shaped branch structure. When the voltage standing wave ratio is less than 2,the antenna operating frequency range is 2. 5 ～ 16 GHz,and its impedance bandwidth is 13. 5 GHz. The biggest feature of the antenna is the dual trap characteristics in the frequency range of WiMAX ( 3. 4 ～3. 69 GHz ) and WLAN ( 5. 15 ～5. 825 GHz), which can reduce the interference of WiMAX and WLAN system. In addition, the antenna adopts coplanar waveguide feeding and has good coplanar characteristics. The results of simulation and test show that the antenna has good trapping characteristics in the UWB frequency range,and can effectively suppress the interference of other existing narrowband systems. The antenna has obvious advantages in size and bandwidth for the traditional UWB antenna.%超宽带(UWB)系统的工作频段与现有的全球微波互联网接入(WiMAX)、无线局域网络(WLAN)系统等窄带系统的频段相互重叠,会导致系统相互干扰.为了有效抑制现有窄带系统对超宽带通信系统的干扰,在单极子天线的基础上,通过在带有L型分支结构的矩形辐射贴片上开槽的方法,设计了一款具有双陷波的超宽带天线.当电压驻波比小于2时,天线工作频率范围是2.5～16 GHz,其阻抗带宽为13.5 GHz.该天线最大的特点是在WiMAX(3.4～3.69 GHz)以及WLAN(5.15～5.825 GHz)的频率范围具有双陷波特性,能够降低WiMAX和WLAN对系统的干扰.同时,天线采用共面波导馈电,具有良好的共面特性.仿真和测试结果表明:该天线在超宽带频率范围内具有良好的陷波特性,能有效抑制现有其他窄带系统的干扰.与传统的超宽带天线相比,该天线在尺寸和带宽上具有很明显的优势.