Considering the disadvantage of the traditional planar inverted-F antenna (PIFA), a miniaturization PIFA applied in the wireless local area network (WLAN) wireless router was proposed. The dimension of the antenna and PCB, the antenna's placement on the PCB and parameters of the plastic shell were investigated to improve the performance. Due to the small size and simple feed structure, the proposed antenna can be feasibly integrated on the PCB. The measured results show that a bandwidth between 2. 35 GHz and 2. 5 GHz with return loss less than -10 dB can be achieved. Meanwhile, the radiation beam width of this antenna is much wider than that of the traditional PIFA. The nearly isotropic radiation patterns guarantee the reception of signals in all directions.%针对已有平面倒F天线的不足,在综合考虑天线及PCB板尺寸、天线在PCB板上的安装位置以及塑料机壳参数等因素对天线性能的影响后,设计了一个用于无线局域网(WLAN)无线路由器的小型化平面倒F天线.该天线面积小、馈电简单,能方便地集成在电路板上.测试结果表明,天线在2.35GHz至2.5GHz频带内回波损耗小于-10 dB,工作带宽满足设计要求.与传统平面倒F天线相比,所设计的天线有效展宽了波束宽度,近乎各向同性的方向图能保证360°空间内均能有效接收信号.
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