【作者】 屠磊； 宋立众；

【Author】 TU Lei;SONG Lizhong;Information Science and Engineering College,Harbin Institute of Technology;

【机构】 哈尔滨工业大学信息科学与工程学院；

【摘要】 本文以超宽带印制天线(相对带宽为84.7%)为解耦对象,分别加载两种超材料解耦方案,对比探讨解耦效果。第一种解耦方案采用改进的类叉型电磁带隙结构,具有小型化、超薄、宽频率带隙的特点;第二种解耦方案采取基于分形频率选择表面与电阻膜的吸波体,具有超薄、宽吸收频带、吸波深度均匀的特点。两者对于天线水平面方向图的解耦能力相近,每个频点处不圆度平均减小1 dB,吸波体的效果更好;对于阻抗带宽而言,电磁带隙结构解耦效果更优,完全恢复原天线带宽(170～420 MHz),而吸波体结构的载入对天线阻抗带宽影响更大。因此在本文探讨的平面结构中,电磁带隙结构更适合作为解耦方案。更多还原

【Abstract】 In this paper,the ultra-wideband printed antenna(with a relative bandwidth of 84.7%) is used as the decoupling object,and two metamaterial decoupling schemes are loaded separately to compare and discuss the decoupling effect. The first decoupling scheme adopts a modified fork-like electromagnetic bandgap structure with the characteristics of miniaturization,ultra-thin and wide frequency bandgap;the second decoupling scheme adopts an absorber based on fractal frequency selective surface and resistive film with ultra-thin,wide absorption band and uniform absorption depth.Both have similar decoupling ability for the antenna horizontal plane directional diagram.The out-of-roundness at each frequency point is reduced by 1 dB on average,and the effect of the absorber is better;for the impedance bandwidth,the decoupling effect is better for the electromagnetic band gap structure,which completely recovers the original antenna bandwidth(170～420 MHz),while the loading of the absorber structure has more influence on the antenna impedance bandwidth.Therefore,among the planar structures discussed in this paper,the electromagnetic bandgap structure is more suitable as a decoupling scheme.更多还原