本文提出了一种在贴片上加载改进的U形缝隙的新型双频微带天线。该天线结构简单，可以应用在无线局域网802.11b（2.4~2.48GHz）和802.11a（5.150~5.350GHz）的系统中，而且只需简单修改天线尺寸参数就可以实现对天线高频段和低频段的调节。本天线使用Ansoft公司的HFSS软件进行仿真和优化，在低频和高频分别获得100MHz和300MHz的带宽，并且能达到实际应用的波束宽度、增益和交叉极化电平。

A novel microstrip antenna with a U-slot on the patch is presented in this paper, which satisfy the requirements of wireless local area network(WLAN) 2.4GHZ(802.11b) and 5.2GHz(802.11a) applications. The lower and higher resonant frequencies can be easily tuned by adjusting a few antenna parameters. We design this antenna by using computer simulation program Ansoft HFSS, and some optimizing
Followed . The model achieves the required WLAN specifications in terms of beamwidths, gain and cross-polarization level. The antenna bandwidth is 100MHz at 2.4GHz and 300MHz at 5.2GHz, respectly.