【作者】 李颖；

【导师】 王德禹；

【作者基本信息】 上海交通大学 ， 工程力学， 2007， 硕士

【摘要】 随着军事上隐身技术的发展,频率选择表面(FSS)越来越受到人们的重视,频率选择表面简单的讲就是一种电磁滤波器,它能让有用的电磁波通过,让不想要的波反射掉,或者相反。很明显,将它应用于战斗机或舰船的雷达罩上,能不在影响本方雷达工作的情况下,将不在本方雷达工作频带内的波反射掉,如果雷达罩具有一定的倾角,那么对方的雷达将收不到它发出的信号,这样就成了隐身。频率选择表面还有许多其它用途,例如用于卡塞格伦天线的副反射器等。分析平面周期结构的传统方法是用积分方程法、场分量匹配法,但这些方法过程复杂。因此,近年来发展了很多算法,如矩量法(MOM)、时域有限差分法(FDTD)和矢量有限元法(EB-FEM)。本文采用的是矢量有限元法,这种方法的计算量小,仿真结果较精确,能够仿真多种形状,任意介质的频率选择表面,并且用这种方法很容易分析栅格瓣、表面波现象。本文所给出的仿真实例表明,分析结果与相关文献的结果吻合很好。最后,本文在论述基本理论的同时,也给出了相应的计算和设计实例,谨供从事FSS研究的人员参考。更多还原

【Abstract】 With the development of stealth technology, the importance of the Frequency Selective Surface(FSS) is realized by more and more people. The FSS simply is a type of electromagnetic filter. The useful electromagnetic waves can get across it, but unwanted waves will reflect from it, or the thing reverses. When applied to the radome on fighters or worships, the FSS won’t affect our radar’s performance and make the waves which are out of working band of our radar reflect from the radome, then the enemy’s radar can’t receive its signal which has been transmitted from it. The above is so called stealth. The FSS still have many uses, for example, it can be applied to the Cassegrain subreflector.The traditional analysis method of FSS is integral equation method, field component match method etc. but analytic process is very complex and confused. In order to reduce the analytic complex, the new arithmetic are developed in recent years. Such as the Method of Moment(MOM), Finite Difference Time Domain(FDTD) and Edge-Based Finite Element Method(EB-FEM). In this paper, we adopt EB-FEM. This method spends less computing time and has the more precise simulation. And it can also be used to simulate FSS with vary shapes and arbitrary dielectric slabs. At the same time, it can easily analyze the grating lobes and surface waves by this method. The simulations presented in this paper indicate that the computed results are in accord with other relational article.Finally, in this paper, not only the fundamental principle but also the computational and design examples are presented. I hope it will be helpful for the researchers on FSS.更多还原