WLAN小型双频微带天线的设计与分析

在分析传统缝隙微带天线的基础上,用传输线和空腔模型设计了一种可用于WiFi、WiMAX的WLAN微带天线。在贴片与接地板之间引入短路面使天线实现小型化,在贴片上开U型缝隙产生双频辐射,采用较低介电常数的介质基板和添加空气腔展宽了天线的带宽。仿真结果表明,当电压驻波比VSWR<2.0时,天线在2.45 GHz带宽为200 MHz(2.35～2.55 GHz),增益达到3.8 dB;在5.2 GHz带宽为1 050 MHz(5.0～6.05 GHz)增益达到8.8 dB。该天线覆盖了WLAN的所有频段,整体性能良好,增益较高,结构简单,易于实现,可以为实际无线通信系统的应用提供参考。

Design and Analysis of Miniaturized Dual-band Micro-strip Antenna Used in WLAN

Based on analyzing conventional slot micro-strip antenna,a novel microstrip antenna that can be used in WiFi and WiMAX is designed by using transmission line model and cavity model.The antenna is miniaturized by importing shorting wall between the patch and ground board while the antenna attain dual-band by using U-slot on the patch.The bandwidth is enhanced by using the substrate of Taconic TLY with low relative permittivity while adding air layer between substrate and patch.Numerical simulation results show that when the voltage standing wave rate VSWR<2.0,the bandwidth is 200 MHz(2.35～2.55 GHz)and the gain is 3.8 dB in 2.45 GHz while the bandwidth is 1 050 MHz(5.05～6.15 GHz) and the gain is 8.8 dB in 5.2 GHz,respectively.The antenna completely covers the Wireless Local Area Network(WLAN) bands and has a good performance,higher gain and simple structure and can be realized easily,which can provide reference for the requirements of wireless communication system in reality.