一种新型左手介质栅波导滤波特性的分析  

ANALYSIS OF FILTER CHARACTERISTICS FOR A NEW TYPE OF DIELECTRIC GRATING WAVEGUIDE BASED ON LEFT-HANDED MATERIALS

作　　者：程健[1] 徐善驾[1] 

机构地区：[1]中国科学技术大学电子工程与信息科学系,安徽合肥230027

出　　处：《红外与毫米波学报》2008年第1期31-34,64,共5页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金(60471037;63531020)

摘　　要：提出了一种新型的基于左手介质的介质栅波导阻带滤波结构,并采用多模网络与严格模匹配相结合的方法,对该左手介质栅波导阻带滤波特性进行仔细严格的分析;给出了主模的B rillou in图,以及滤波结构的归一化中心频率、阻带的宽度和带内最大衰减等特性和结构参数的关系,并与传统右手介质栅波导作了比较,说明了产生两者不同特性的原因.数值结果表明左手介质栅波导的阻带带宽和带内衰减要比通常介质栅波导的阻带带宽和带内衰减大得多.这些计算结果对于所提新型带阻滤波结构的设计有指导意义.A new type of dielectric grating waveguide filter based on left-handed material （ LHM ） was proposed and its band-rejected characteristics were carefully analyzed by a method which combines the rigorous mode matching procedure with multimode network method. The Brillouin curve of the dominant mode was calculated and the variations of the normalized center frequency and the bandwidth as well as the maximum attenuation constant in the stopband with the geometry structure parameters were given. Comparisons between the LHM and normal grating structures were presented with some explanations. It is indicated that the bandwidth and the maximum attenuation constant in the stopband for the LHM grating waveguide are much larger than those for the conventional grating structure. The calculated results are of guiding significance for the design of the present kinds of band-rejected filters.

关 键 词：左手介质 周期结构 介质栅 滤波结构 

分 类 号：TN814[电子电信—信息与通信工程]