| Frequency Selective Surface (FSS) is two-dimensional periodic array structure, usually consist of many passive metal cell (band stop) or periodic slot (band pass). It can be used to control the transmission and reflection of the microwave field effectively, serving as a low pass, high pass, band pass or band stop filters. FSS could be used across a wide range of electromagnetic frequency band, It could be used in antenna system, filters, radomes, diplexer, etc.Since the directly design of FSS is rather difficult, analyzing of certain structure is important in FSS development. There are various methods to analyze FSS, such as Finite Element Method (FEM), Finite Difference Time Domain (FDTD), Method of Moments (MoM), etc. In this paper the effect of cell rotating on electromagnetic scattering is analyzed using the method of moments (MoM) based on roof-top base function. Using coordinate transform, we get the MoM formula after rotation. Then we compute the current distribution on the metal patch of the FSS, and then we can compute the reflection coefficient using current distribution on the patch. Some of the result accord perfectly with that present in other literature. Then we analyze the effect of rotating on the electromagnetic scattering characteristics. Comparing to traditional FSS, the novel frequency selective structure has the advantage of easy tuning. |
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