一种双开口谐振环结构的新型双负介质

Double negative medium composed from two split ring resonators

提出了一种双开口谐振环结构的新型双负介质单元模型,该模型集电、磁谐振于一体,结构简单。用时域有限差分法和CST软件对该新型结构进行了模拟对比,并对其物理机理进行了分析,解释了其双负效应发生的原因。从电磁波理论出发,导出了波导中双负介质参数的反演公式,推广了通常提取介质参数的NRW方法,并由此提取了新型双负介质的等效电磁参数。结果表明:在频率10.3 GHz附近其等效介电常数和等效磁导率的实部同时为负值,确定了其双负效应的存在。

A new type of double negative medium（DNG） is proposed, which is made of two split ring resonators and has a simple structure. The numerical simulation of the new DNG is studied by using FDTD method and CST software, the physical mechanism of this structure is analyzed and its double negative effect is illuminated. Finally, the inversion scheme, which is the extension of commonly used Nicolson-Ross-Weir method, is deduced to obtain the constitutive parameters of the double negative medium in a waveguide. The extraction of its constitutive parameters shows that the real parts of the effective permittivity and permeability of this new type of DNG are both negative at frequency 10.3 GHz and its vicinity,which confirms its double negative effect.