一款共面可覆盖 WLAN 及 WiMAX 频段的三频笔记本电脑天线的设计

一款共面可覆盖 WLAN 及 WiMAX 频段的三频笔记本电脑天线的设计

内容简介：采用软件设计和实验相结合的方法，设计了一款紧凑型、共平面、能覆盖2.4/5.2/5.8 GHz WLAN和2.5/3.5/5.5 GHz WiMAX工作频段的笔记本电脑天线．该天线采用耦合馈电方式，通过调节矩形辐射面和L形结构尺寸以及耦合缝隙的大小来产生2.5 GHz和5.5 GHz的谐振频率；通过在L形辐射表面开一个U形缝隙来实现3.5 GHz处的谐振点，该U形槽的长度大约为4 GHz谐振点处的1/4 l；其整个天线的面积只有7.5 mm ×17.5 mm（不包括笔记本电脑天线的地板）．在设计中通过调节矩形耦合辐射体与L形辐射面的间距可以有效地调节各谐振点的强度，还可以实现天线输入输出的阻抗匹配．当被嵌入在支撑笔记本电脑显示屏地板的顶端时，天线能很好地满足WLAN和WiMAX的所有工作频带并具有良好的辐射特性，经过软件优化和对实物的测试，测试结果和仿真结果吻合良好．

Abstract：Using simulation and experiment methods , a compact , coplanar , and cover all the operating bands of 2.4/5.2/5.8/GHz WLAN and 2.5/3.5/5.5 GHz WiMAX systems of laptop antenna were de-signed .The antenna adopts coupling feed mode , by adjusting the size of the rectangular radiating surface and L-typed structure, and the dimension of the slot-coupling to arouse the resonant frequency of 2.5GHz and 5.5GHz; through cutting a U-shaped slit in the L-type radiation surface to achieve the resonance point of 3.5GHz, the length of the U-shaped is 1/4λat the resonance point of about 4GHz.The antenna shows an entire area is only 7.5 mm ×17.5 mm ( not including the system ground plane ) .In the proce-dure of design , through changing the gaps between the rectangular and L-shaped radiator can adjust the strength of the resonance point , but also realize the matching of input and output impedance .When mounted at the top edge of the display panel in the laptops , three wide operating bands for covering all the desired operating bands of WLAN/WiMAX systems are obtained and the antenna has a good radiation characteristics .The optimizations by using the simulator software Ansoft HFSS were performed , and an actual model has been prototyped for experimental measurements , the measured and simulated results are in good agreement .

作者：栗建豪, 吴多龙, 吴艳杰, 黎宇彪,

关键词：多频段, 小型化, 笔记本电脑天线, 耦合天线, WLAN, WiMAX,