【作者】 肖鸿；

【导师】 姜宇；

【作者基本信息】 哈尔滨工程大学 ， 电磁场与微波技术， 2010， 硕士

【摘要】 根据麦克斯韦方程组及波动方程,电磁波可以在介电常数和磁导率均为负数的媒质中传播,其所表现的“奇异特性”给传统微波领域带来了极大地冲击。1966年,Veselago提出异向介质这一概念,为异向介质的出现提供了一个理论平台,而2000年Smith根据Pendry的研究成果制造出第一块人工异向介质之后,其人工结构设计、电磁特性分析以及强大的应用前景成为当今国内外微波技术的研究热点。本论文的研究内容主要是围绕异向介质基本结构单元展开。首先介绍异向介质独特的奇异性质,如负折射及逆多普勒效应等；然后讨论异向介质基本单元的两种主要分析方法：S参数提取法及等效电路法,分别从理论和验证的角度出发,对这两种方法进行了探讨,分析两种方法各自的优缺点,在此基础上,针对“可控性”型异向介质基本结构,采用神经网络来对其进行分析,仿真结果证明,异向介质的神经网络分析可以减少再次预测所需时间,其结果与S参数提取法相吻合,证明该方法是一种快速而又准确的异向介质基本结构分析方法；其次针对异向介质基本单元存在的损耗大、带宽窄等问题,对异向介质结构进行改进,提出一种单面宽频带异向介质单元,分析其电磁特性,从数值上得到其双负频带范围,并通过Ansoft HFSS观测磁场随相位的动态变化规律,验证该结构的后向波特性；最后将该结构应用到矩形微带贴片天线中,检测其对于微带天线的小型化作用及对天线辐射性能的影响。更多还原

【Abstract】 On the basis of Maxwell equation group and wave propagation equation, electromagnetic wave can be propagated in the media whose permittivity and permeability are double negative. Its bizarre characteristic has bring an enormously shake to traditional microwave field. Veslago proposed the concept called Metamaterial in 1966 and provided a platform for the appearance of Metamaterial. After 2000, while Smith produced the first man-made Metamaterial according to Pendry’s research results, its man-made architectural design, electromagnetic characteristic analysis and strong application prospect have become the research spots in today’s microwave technology at home and abroad.The research contents of this paper are mainly focus on the basic structural unit of Metamaterial. Firstly, it introduces the medium’s distinctive bizarre characteristic, such as negative refraction and the inverse Doppler effect, etc. And then discusses the two different main analysis methods of the media basic unit: the S parameter extraction method and the equivalent circuit method, from the theory and validation point view respectively, which are discussed to analyze their respective advantages and disadvantages of both methods. On this basis, use neural network to analyze the controllable type of the Metamaterial basic structure. The simulation results show that different neural network analysis to Metamaterial can reduce the time required for re-forecasting, the results of neural network are coincide with the S parameter extraction method, that proves the method to be a fast and accurate analysis for the basic structure of Metamaterial. Secondly, to the problem such as the large of loss, narrow bandwidth, improved the structure of Metamaterial, the paper brings forward a one-sided wide broadband basic structure of Metamaterial, analyzing its electromagnetic character properties, getting the negative frequency range numerically, observing dynamic changes of the magnetic field varying with the phase by electromagnetic software Ansoft HFSS, verifying the back wave properties of the structure. Finally apply the structure of Metamaterial in a rectangular microstrip patch antenna, detecting the effects to the miniaturization and radiation performance of the microstrip antennas.更多还原