应用于Wi-Fi频段的背腔式缝隙天线设计  

Design of the cavity-backed slot antenna for Wi-Fi band application

作　　者：崔勇[1] 王勇[1] 杨世武[1] 

机构地区：[1]北京交通大学电子信息工程学院,北京100044

出　　处：《电波科学学报》2016年第1期150-156,共7页Chinese Journal of Radio Science

基　　金：中国铁路总公司科技研究开发计划项目(2014X0008-I)

摘　　要：采用波导反射模型分析了背腔深度对缝隙天线辐射特性的影响,通过仿真计算,确定了当背腔深度等于四分之一波导波长时,金属背腔会使缝隙天线的输入电阻加倍,但对输入电抗产生影响较小,根据以上仿真结果,提出了一种有效的背腔式缝隙天线的输入阻抗电路模型,分析了馈电位置和缝隙长度对天线谐振点的影响,为缝隙天线的多频点设计提供了理论依据.结合仿真工具,设计了两类工作于Wi-Fi频段的背腔式缝隙天线:第一类天线工作于室外2.4GHz频段;第二类天线可以同时工作于2.4GHz和5.2GHz频段.最后,对天线的S_11系数进行了实测,实测与仿真结果基本一致.In this paper,the effect of the cavity depth on the radiation of the slot antenna is analyzed with the innovative waveguide reflection model.With the help of the simulation results,we make sure that when the cavity depth equals to one quarter guide wavelength,the cavity will double the input resistance of the slot antenna,but has small effect on the input reactance.According to the simulation result,an effective input resistance circuit model of the cavity-backed slot antenna（CBSA）is built.The effect of the feed position and slot length on the resonant frequency is also analyzed,which is the theoretical basis for the design of multi-frequency slot antenna.Based on the simulation tool,two kinds of CBSA working at Wi-Fi band are designed.One kind works at 2.4GHz for outdoor application,another works at 2.4GHz and5.2GHz.In the end,the S_11 coefficient of the antenna is tested,the measurement results agree well with the simulation results.

关 键 词：波导反射模型 电路模型 背腔式缝隙天线 WI-FI 多频 

分 类 号：TN82[电子电信—信息与通信工程]