应用于WLAN/WiMAX的双6型对称三频单极子天线

Tri-band monopole antenna with symmetric double-6 shape applied to WLAN/WiMAX

设计了一款适应于无线局域网络(WLAN)和全球微波互联接入(WiMAX)的由微带线馈电的平面印刷三频单极子天线。天线的正面呈对称双6形状,提供低频辐射和较宽带宽的高频辐射。为了满足三频设计激励起WiMAX所需的中间频段,在天线背面的接地板上开对称槽线。利用有限元法的电磁仿真软件Ansoft HFSS 15.0进行仿真设计,优化结构数据并得到天线的最终辐射特性结果。结果表明,天线在回波损耗小于-10 dB的工作频带分别是2.39~2.72 GHz,3.36~3.86 GHz和4.22~5.83 GHz,很好地实现了在WLAN和WiMAX的工作频带。同时天线尺寸小、结构简单、共面性好、容易实现,而且天线在各个工作频段具有良好的方向性和增益。

A planographic tri-band monopole antenna fed with microstrip line is designed,which is suitable for the wireless local area network(WLAN)and worldwide interoperability for microwave access(WiMAX). The front of the antenna presents the symmetrical double -6 shape to provide the high-frequency radiation with relatively-wide bandwidth and low-frequency radiation.In order to satisfy the tri-band design and low-frequency radiation,the middle frequency band required by WiMAX is excited,and the earth plate on the back of the antenna is slotted with the symmetric slot line. The electromagnetic simulation software Ansoft HFSS 15.0 based on finite element method is used to perform the simulation design for the antenna,optimize the structure data,and get the final radiation characteristics results of the antenna. The simulation results show that the antenna works at 2.39~2.72 GHz,3.36~3.86 GHz and 4.22~5.83 GHz respectively while the return loss is less than -10 dB,and can better work at the frequency bands of WLAN and WiMAX. The antenna has small size,simple structure,good coplanarity,easy realization,and good directivity and gain in each working frequency band.