物理学报2011，Vol.60Issue(5)：848-855,8.
基于TE10矩形波导的异向介质有效本构参数提取算法
Extraction algorithm for retrieving the effective constitutive parameters of metamaterials based on TE10 rectangular waveguide
摘要
Abstract
A novel retrieval method of the effective constitutive parameters of metamaterials based on TE10 rectangular waveguide is proposed, which is adopted to extract effective relative permittivity ε and permeabilityμ for the composite ferrite and wire array metamaterial in multiple symmetrical unit cell configuration. Much attention has been paid to choose the correct branch of the real part of the propagation constant β for the metamaterial with multiple unit cells, and in terms of the relationship between the measured values and theoretical values in the measurement theory, β values in the case of multiple unit cells are determined by taking the extracted β values for a single unit cell as the measured values for the multiple unit cells case. Owing to the coupling effect between the unit cells of the metamaterial with multiple unit cells,the electromagnetic wave mainly behaves as the periodic Bloch wave, which is usually negligible for a single unit cell, so the extracted effective constitutive parameters for a single unit cell generally can not be assigned as those for the metamaterial with multiple unit cells directly. However, β values for a single unit cell is generally prone to be extracted,which can be the first step to extract the β values in multiple unit cells case. It is pointed out that the extracted effective constitutive parameters can be physically meaningful only if attenuation coefficients of higher Bloch wave modes are larger than that of the fundamental Bloch mode in the periodic metamaterial, and under this condition, higher Bloch wave modes will get further attenuated with increase of the unit cell number, leaving only the fundamental mode propagation, which makes the extracted ε and μ more stable and convergent.关键词
TE10矩形波导/异向介质/有效本构参数提取/铁氧体和金属线阵异向介质Key words
TE10 rectangular waveguide/ metamaterial/ extraction of effective constitutive parameters/ ferrite and wire array metamaterial引用本文复制引用
龚建强,梁昌洪..基于TE10矩形波导的异向介质有效本构参数提取算法[J].物理学报,2011,60(5):848-855,8.基金项目
中央高校基本科研业务费专项基金(批准号:JY10000902018)资助的课题. （批准号:JY10000902018）
