摘要
基于X型金属结构,提出了一种超宽带复合左右手传输线材料结构单元,该结构单元由介质板及其两侧反向对称的X型金属结构组成。从分布参数电路理论角度对材料单元的左右手特性成因进行了定性分析;利用等效参数提取法,通过S散射参数提取了该结构单元的相对介电常数和相对磁导率,并结合折射率进一步验证了这种左右手传输线材料的传输特性。仿真结果表明,在电磁波平行于介质板入射的情况下,该结构单元同时存在左右手频带,在S波段表现出超宽带的左手特性,并且在其他多频点处得到了零折射率,从而构造了一种正零负复合媒质材料。
Based on the X-type metal structure, a unit cell of composite left/right- handed transmission line（CRLH-TL）with ultra-wideband is proposed. The unit cell is composed of a dielectric-slab and the X-type metal structures reverse symmetrically set on both sides of the slab. The distribution parameters circuit theory is used to analyze the cause of the left and right-handed properties of the material in general, and the effective parametric extraction method is used to extract the relative permittivity and relative magnetic permeability from the S parameters of the structural unit. Furthermore, the refractive index is also computed to validate the trans- mission characteristics of the CRLH-TL. The Simulation results demonstrate that the structural units could give rise to both right-handed and left-handed pass-band in the case of an electromagnetic wave paralleled incidents on the dielectric-slab. It also shows ultra wideband characteristics in the S frequency band; meanwhile, it could get zero refractive index at other frequency points. A positive-zero-negative composite medium material is constructed.
出处
《电波科学学报》
EI
CSCD
北大核心
2012年第6期1136-1140,1262,共6页
Chinese Journal of Radio Science
基金
国家自然科学基金(60871081
61072136)
京市自然科学基金(4112039)
