The Study Of Frequency Selective Surface Based On Metamaterials

Frequency selective surfaces (FSS), a kind of single or multi-layered quasi-planar structures, consists of periodic conductive patchs or apertures covered by dielectric layers. It shows a frequency-selective feature to the incident electromagnetic wave. The substantive characteristic of this feature is that the surfaces can exhibit a filter action to the different frequency, incent angle or polarization incent wave. Based on this point, it can be used in communication and radar systems.Metamaterial has become one of most popular research field, which exhibits plant of exhibit physical characters, such as negative group velocity, negative index of refraction, ideal imaging, reversed Doppler Effect and reversed Cerenkov radiation. At present, the research and technique of Metamaterial has been more and more applied in wireless communication.In consideration of restricted by processing technique of the conductive patchs and dielectric layer, the most important task in FSS design is to choose the proper topological periodic structure. As a quasi 2-dimension EM structure, the material and thickness of the dielectric layer also have a great impact on the performance of FSS. In this thesis, we took the advantage of metamaterial to design a novel FSS, which have miniaturized unit size and excellent frequency response curve.We designed a FSS model which unit cell consists of hybrid aligned Double Split-Ring Resonator. This model overcomes the defect of traditional DSRR, which can only operate properly with the specific polarization. It can be used for random polarized wave. The center frequency of the FSS is 9.65 GHz, and it can also work at half-frequency and quarter-frequency point. The peak attenuation is low to -35dB, keeping 800 MHz -10dB attenuation band. This novel FSS model can be used to design Radom, anechoic materials, etc.