1.7—2.7GHz宽频带小单元异向介质设计及其介质参数提取

提出一种单元电尺寸小、工作频带宽、损耗小、结构简单的异向介质设计方案，在1.7—2.7 GHz上所设计的异向介质结构单元电尺寸小于0.035，相对带宽达到45.5%，在整个工作频带上单个结构单元传输损耗小于0.75 dB.对由上述异向介质单元构成的半无限大异向介质平板的电磁波反射、透射特性进行了数值仿真分析，并提取出了电磁波在该异向介质平板中传播时的波数、相速、折射率以及该异向介质平板的有效介电常数和有效磁导率等一系列电磁特性参数，仿真与计算结果表明复波数的实部、相速以及折射率的实部在1.7—2.7 GHz的范围上为负值，并且在相同频带上，有效介电常数和有效磁导率的实部同时为负值，从而有效地验证了“后向行波效应”、“负折射效应”、“双负效应”等异向介质特有的电磁特性，对上述异向介质的存在性给予有力证明. 关键词： 异向介质 宽频带 小单元 介质参数

Design and modeling for 1.7-2.7 GHz broad-band left-handed material with miniaturized unit cell and its characterization

An 1.7—2.7 GHz broad-band left-handed (LH) metamaterial with miniaturized unit cell is designed. The relative bandwidth of designed metamaterial is up to 45.5%， the electrical length of its unit cell is less than 0.035，and the transmission loss per unit cell is less than 0.75 dB in the whole operational band of the LH metamaterial. In this paper, the reflection and transmission characteristics of a semi-infinite LH metamaterial plate consisting of LH metamaterial cells is simulated, and the wave number, phase velocity, refraction index, effective permittivity and effective permeability are calculated. The results show the real part of the wave number and the refraction index and the velocity are negative while the real part of the effective permittivity and effective permeability are both negative in the 1.7—2.7 GHz band range.