平面单极子超宽带天线的设计方法研究

Research on planar monopole UWB antenna design

超宽带通信是具有极宽频谱资源的无线电技术,主要用于短距离高速率通信、图像传输、无线传感器网络等应用领域,而天线作为无线系统的能量转换装置,其性能的优劣对整个系统起着重要的影响作用。为了获得好的辐射性能,基于平面单极子天线结构,提出采用共面波导馈电方式的平面超宽带天线模型,通过对辐射贴片的削角改变和馈电形状的渐变处理后,天线不仅具有紧凑的平面尺寸,也实现超宽的阻抗匹配特性。实验结果表明:天线的工作频段为2.72~14.2GHz,满足超宽带系统的频段需求,同时天线的E面和H面方向图具有较好的对称性和全方向辐射特性。

UWB is a radio engineering technology with ultra wide spectrum resource,which is mainly applied to the short-range high speed communication,image transmission,wireless sensor network and so on.The antenna is the energy conversion device of wireless systems,which performance has the significant influences on the whole system.To gain better radiation performance,the planar UWB antenna with CPW feeder is proposed based on planar monopole antenna model.The compact size and wide impedance matching characteristic of proposed antenna is obtained by modifying rectangular radiation patch and CPW feeder.Experimental results show the antenna working bandwidth is from 2.72~14.2 GHz,which have satisfied the needs of UWB system.And the E-plane and H-plane radiation patterns of the antenna have the traits of symmetry and omni-direction.