中文摘要：

本文在分析传统平面倒F天线实现多频的U形、L形开槽方式基础上,对天线馈电形式及贴片的开槽形式进行了改进设计,通过改变馈电形式,并且在双层矩形贴片开出双∏型槽,使得天线实现四频特性。同时以一个工作在RFID（915MHz）、GSM（1800MHz）、WCDMA（2000MHz）和WiMAX（2.45GHz）,4个频段的平面倒F天线为例,给出了详细的设计过程和具体的设计参数.这种天线结构简单,容易制作,易于调节。本文使用HFSSV10进行了仿真分析。实测结果和仿真结果比较吻合。

英文摘要：

On the basis of analyzing traditional planar inverted-F antenna with U and L slot, quadruple bands were realized by etching double Ⅱ-shape slots on each layer and improving the structure of antenna feed form as well as the the feed network. An antenna operating at RFID（915 MHz）,GSM（1800 MHz）, WCDMA（2000 MHz） and WiMAX （2.45 GHz） was described as an example , and the design procedure and parameters were also provided. The effects of different parameters on antenna characteristics have been investigated. The antenna was easy to fabricate and adjust. Simulation results were obtained by using HFSS V10 software and compared with experimental results. They agreed fairly well.