新型加载宽带线天线研究

针对无线通信系统的需求,提出了一种新型的小型化宽带天线--加载宽带线天线.对这种新型天线进行了分析,给出了天线的设计思想和设计方法,通过仿真手段详细讨论了天线的各个结构参数对于性能的影响,并详尽分析了天线的阻抗和辐射特性,分析结果表明这种新型宽带天线具有较宽的阻抗带宽和水平全向的方向图.最后给出了天线的实物模型和天线的实测性能,实测小于-10 dB的频率范围为153 MHz～475 MHZ,与仿真结果基本吻合.这种新型加载宽带线天线的结构和电特性决定了其非常适用于移动通信终端设备,作为手.持终端天线和车栽天线具有广阔的应用前景.

Study of novel loaded wide-band wire antenna

A novel miniature loaded wide-band wire antenna is proposed to satisfy the requirement of wireless communication systems.Analyses are conducted to determine the novel antennas' properties.The designing idea and method are introduced firstly.The influence of performance for different antenna structure parameters are discussed in detail by simulation tools.Then the impedance and radiation performance are researched.The analytic results verify that the novel antenna has not only wide impedance bandwidth but also omnidirectional pattern in horizontal direction.Finally,the experiment model and measured performance of the antenna are given,and its result is compared with the simulation.The measured 10 dB return loss bandwidth is from 153 MHz to 475 MHz,and it is identical with the simulated result.The application prospect of the loaded wide-band wire antenna will be fully broad,because it has simple structure and good electromagnetic characteristics.So it is suitable for mobile communication terminal device,especially in handheld terminal and vehicle.