一种地面开槽的双频宽频单极子天线

摘要

A novel dual-band monopole applied in wireless communication is developed,and the antenna is fed by CPW.The size of antenna is only 30 mm×25 mm×0.8 mm,and the substrate is FR4.The antenna is designed based on planar monopole,by adding slots in the ground of CPW,it can work in two bands,and the impedance matching is improved as tapered structure is added in the monopole patch.Numerical simulation on the characters of the antenna is performed with HFSS software.The simulation results demonstrate that the antenna has the radiation features similar to monopole,and has wider bandwidth,S11 is less than -10 dB within 3.01~6.1 GHz,the relative wideband of the antenna is 67.8%,and the operating frequency band can cover 3.5/5.2/5.5/5.8 GHz.Moreover,the antenna has omnidirectional radiation pattern and good radiation gain.It has small size and simple structure,and is easy to be fabricated.Therefore,the antenna can be widely used in WLAN and WiMAX communication system.%针对无线通信应用,设计了一种双频单极子天线,天线由共面波导馈电.天线的整体尺寸为30 mm×25 mm×0.8 mm,基板选用FR4.天线在平面单极子的基础上,通过在共面波导地平面上开槽,实现了双频特性;同时采用具有渐变结构的单极子贴片,实现了在较宽频带上良好的阻抗匹配.采用HFSS仿真软件对天线进行仿真,仿真结果表明:天线具有单极子天线的辐射特性,天线带宽较宽,在3.01~6.1 GHz反射损耗小于-10 dB,相对带宽达到了67.8%,工作频段覆盖了3.5/5.2/5.5/5.8 GHz频段.天线具有较好的全向辐射方向图和增益,其尺寸小、结构简单和易于加工,能够广泛用于WLAN和WiMAX通信系统中.