【作者】 万磊；

【导师】 胡希伟； 刘明海；

【作者基本信息】 华中科技大学 ， 脉冲功与等离子体， 2011， 硕士

【摘要】 左手材料(LHMs)是一种介电常数?和磁导率?都为负的人工电磁材料,所以左手材料具有异于传统媒质的奇异特性。这种材料从2000年被实验验证可以由人工制备得到后,引起了整个科学界的普遍关注。目前,主要基于两种理论来制备左手材料,1金属棒(Rods)和开口谐振环(SRRs)的阵列结构,2左手传输线结构。本文以实现左手材料的的这两方法为理论基础,研究了左手材料的一些奇特的性质,分析了左手传输线的等效电路模型的基本理论。论文分析了复合左右手结构(CRLH)和逆开口谐振器(CSRR)的基本原理和等效电路模型,根据理论分析,我们提出利用左右手复合传输线的性质,在基板上刻蚀矩形逆开口谐振器或者圆形逆开口谐振器的方法来构造微波滤波器。采用软件Ansoft HFSS仿真后比较了性能优劣,同时优化了尺寸,再利用印刷电路板的方法制作了滤波器的实物。经过实验和仿真结果对比,这种滤波器的频段通带比较宽,并且与传统的带通滤波器相比,在相同的性能下几何尺寸可以比较小,结构简单,加工容易,成本低廉,可以应用到微波电路中。更多还原

【Abstract】 Left-handed materials (LHMs) is an artificial metamaterial with negative permittivity? and negative permeability ? . Because of the ? and ? are both negative, some unusual phenomena appear from it. Since the experimental realization of this kind of material in 2000, it has stirred a growing interest among experimental and theoretical researchers. So far, there are two approaches to construct LHMs. One is based array of the Rods and SRR (Split Resonant Ring), and another is based on the left-handed transmission line. In this thesis, the unusual electromagnetic characteristics are analyzed based on these two approaches respectively, and the application of the left-handed transmission line in the microwave circuit is researched.Then the thesis brief review of composite right/left-handed(CRLH) transmission line structures based on complementary split ring resonant-type(CSRR)’s basic theories, a novel band-pass microwave filter is proposed .We use the etching printed circuit board (PCB) to adapting a rectangular or circular CSRR to improve the transmission performance. After using Ansoft HFSS to simulate the result and compare the several kinds of filter models, we manufactured some real microwave filter models. Comparing with the tradition band-pass filter, the new structure has shown some inherent advantages, such as compactness and wider passband. This microwave filter is easy to manufacture and accord the microwave circuits.更多还原