一种新型宽频带低损耗小单元左手材料的设计与实现

Design and analysis of a new type of wideband low-loss and small size left-handed materials

设计了一种结构简单、可在电路板单面上印刷的新型左手材料.该结构由周期性排列的"Ⅱ"组成,具有频带宽、损耗低、尺寸小等优点.该材料在一定频段内具有介电常数和磁导率同时为负的特性.仿真结果表明:在8.79—15.57 GHz频率范围内,折射率实部为负,而虚部接近于零;同时在该频段内的波阻抗实部大于零.从而说明该材料具有左手特性,在此基础上对该结构进行了制作、加工、并通过矩形波导法进行了验证.同时,该左手材料的相对带宽达到55.74%,而最大单元损耗仅是0.27 d B,远远优于传统的左手材料.

A single-side and one-dimensional left handed-material on the basis of periodic ＂Ⅱ＂ structure is designed in this paper.The ＂Ⅱ＂ structure of left-handed material is very simple and has some advantages,such as large bandwidth,small size and low loss.The results of simulation with the software HFSS show that for this structure in a frequency range from 8.79 GHz to 15.75 GHz,the real part and imaginary part of refraction index are less than 0 and approximately 0respectively,and the real part of wave impedance is greater than 0,the largest loss per unit is 0.27 d B,and the relative bandwidth is 55.78%,showing that this ＂Ⅱ＂ periodic structure has the negative character.Based on the simulation results,this periodic ＂Ⅱ＂ structure is fabricated and measured with the vector network analyzer and wave guide method.The measurements are in agreement with the simulations.All these results prove that this left-handed material has some better characters than traditional meta-materials.