一种小型化移动终端全网通天线

A novel miniaturized full netcom antenna for mobile terminal

提出一款适用于移动终端设备的小型化全网通天线,天线由参考地和平面天线构成,采用同轴馈电.该天线的高频通带响应通过高频单元基模与低频单元分支的高次模实现,天线的低频通带响应通过低频单元基模实现,并采用展宽低频单元枝节的方法实现所需低频通带带宽.天线总尺寸为30mm×67mm,其中辐射单元为33mm×30mm,参考地大小为34mm×30mm.使用微波仿真软件HFSS对天线的尺寸进行了设计优化,并对回波损耗、天线表面电流和天线的辐射方向图进行研究.天线样品的实测-6dB阻抗带宽为820～968 MHz,1 695～3 020 MHz,覆盖了工信部所颁布的国内移动通信运营商所用的2G、3G、4G网络的全部频段.天线结构简单、覆盖频率广、体积小,具有一定的工程应用价值.

In this paper,a novel miniaturized antenna for full Netcom mobile terminal devices is proposed.The antenna consists of reference ground plane and planar antenna,and is fed with coaxial cable.The high-frequency passband response of the antenna is achieved by the fundamental mode of the highfrequency unit and the higher order modes excited in the branch of low frequency unit.The low frequency passband response is accomplished by the low frequency unit with the broadening width to increase the low frequency bandwidth.The compact size of the antenna is 30mm×67mm,wherein the radiation unit is 33mm×30mm,and the reference ground size is 34mm×30mm.The structure and size of the antenna are analyzed and optimized with the HFSS software,meanwhile,the return loss,surface current and radiation pattern are also analyzed.The measured-6dB impendence bandwidth of the antenna prototype is 820-968 MHz,1 695-3 020 MHz.It covers the complete 2G,3G,4Gnetwork spectrum of domestic mobile operators issued by Ministry of Industry and Information Technology of China.The antenna is simple in structure,small in size and covers a wide frequency,and it has certain value in practical applications.