3G系统宽频带室内全向天线研究

A Broadband Omnidirectional Indoor Antenna for 3G

随着3G时代的来临,新的移动通信网络的建设正在全面展开,尤其是室内通信网络的建设更加复杂和重要。针对目前室内3G网络覆盖和建设成本问题,设计了一种宽频带室内全向天线,采用不对称双锥结构,在理论分析的基础上,对传统的双锥天线结构进行了改进,应用商业高频仿真软件(HFSS)对天线结构尺寸进行了优化设计,仿真结果与实测数据吻合较好。天线工作频率为800-2 500 MHz,不附加匹配网络,频带内电压驻波比满足1.4∶1,低频段增益在2 dBi以上,高频段增益在5 dBi以上,可以满足2G和3G移动通信室内网络覆盖要求,覆盖范围与现有室内全向天线相比有较大提高,从而可以有效地降低室内移动通信网络的建设成本,提高和扩充整个网络的质量和容量。

With the coming of 3G Age,the new mobile communication network is building in all-round way.Especially the indoor network construction is more complicated and important.To solve the problems about the network overlays and the cost of the construction,this paper presents a kind of broadband omnidirectional indoor antenna for the third generation mobile communication system.The proposed antenna is of an asymmetrical biconical structure.Based on theoretical analysis,the structure sizes of the antenna have been changed and optimized by HFSS.Its voltage standing wave ratio（VSWR） is less than 1.4 within the frequency range of 800 MHz-2 500 MHz.The gain is more than 2 dBi in low frequency and 5 dBi in high frequency.The antenna can meet the requirements of the wireless broadband communications for 2G and 3G systems,thus the cost of construction for indoor communication is reduced effectively.