应用于WLAN/WiMAX的三频段微带贴片天线设计

摘要

设计了一种应用在无线局域网络（WLAN 2.4 GHz）和微波存取全球互通（WiMAX 3.5 GHz/1.8 GHz）无线通信领域中的小型化三频段微带贴片天线。结构设计主要通过在圆形贴片上开出一个近似T形槽的方式，该天线结构简单、尺寸小、加工方便、成本低且全向特性理想。为了便于数值分析和优化，在HFSS建立了该天线的电磁仿真模型。其研究表明，实测和仿真的结果吻合良好，该天线在其各频段内的回波损耗＜-10 dB，并具有良好的方向性和增益。在3个工作频带内电压驻波＜2，阻抗匹配特性良好，验证了该设计的合理性。%A minitype tri-band microstrip antenna is designed in the local area network for 2.4 GHz and world interoperability for microwave access for 3.5 GHz/1.8 GHz wireless telecommunications applications .The structure of antenna mainly is a similar T-slot loaded on the circle patch .The proposed antenna has the advantages of small size, simple structure, easy fabrication, low cost and omnidirectional irradition .An electromagnetic model of the designed antenna is developed in HFSS for numerical analysis and optimization .The results show that there is a sat-isfactory agreement between measured data and simulated data .The antenna with Return Loss is less than -10 dB at three frequency points and has a good orientation .It has good impedance matching characteristics in the support band with VSWR less than 2, proving the rationality of the design of microstrip antenna .