Analysis And Design Of Band-Pass Frequency Selective Surfaces

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.