一种小型化五陷波UWB天线设计

Design of a miniaturized five-notch UWB antenna

为了滤除窄带信号对超宽带(Ultra-Wide Band,UWB)通信系统的干扰以及解决天线尺寸偏大的问题,设计出一种小型化五陷波UWB天线。该天线通过添加L型枝节、C型槽、倒U型槽以及EBG结构,产生五个陷波带。对天线进行回波损耗(S11)、驻波比(VSWR)以及增益(Gain)等仿真测试,通过天线表面的电流分布情况分析了天线的陷波原理,研究上述结构对天线陷波特性的影响。该天线将UWB通信应用与陷波天线技术相结合,最终尺寸为21 mm×16 mm,实现了体积小、频带宽、多频段陷波特性的性能要求,天线频带覆盖了S、C和X三个波段,具有屏蔽窄带信号干扰的作用,可应用于UWB通信系统。测试结果表明,天线的阻抗带宽为2~12 GHz,在工作频段内具有全向性,并且整个UWB频段内天线的增益变化在4 dB以内,最大增益为4.67 dB,在通带频段内,天线五个陷波特性的结果与仿真结果均吻合良好。

A miniaturized five-notch UWB antenna was designed to filter narrowband signals in ultra-wide band(UWB)communication systems and achieve miniaturization purpose.Five notch bands were realized by using L-shaped branches,Cshaped slots,inverted U-shaped slots,and EBG structures.Return loss(S11),voltage standing wave ratio(VSWR),and gain were simulated for the antenna.Based on the current distribution on the antenna surface,the notch principle of the antenna was analyzed to study how the foregoing structures affect the notch properties of the antenna.By combining UWB communication applications with notch antenna technology,this antenna achieves a final size of 21 mm×16 mm,which satisfies the performance requirements on small size,wide frequency band and multi-band notch.Covering the S,C,and X bands,this antenna can shield the interference of narrowband signals and be applied in UWB communication system.According to the test results,the antenna achieves impedance bandwidth of 2-12 GHz,and is omnidirectional within the operating frequency band.In the entire UWB band,antenna gain varies within 4 dB with maximum gain of 4.67 dB.In the passband,the properties of the five notches of the antenna is consistent with simulation result.