Miniaturized Frequency Selective Surface Based on 2.5-Dimensional Closed Spiral Loops with Stable Resonant Frequency

摘要

A compact frequency selective surface (FSS) based on 2.5-dimensional closed spiral loops with the miniaturized element is proposed and analyzed in this paper. Connecting spiral loop by end-to-end, via-holes and the spiral loops form a closed loop in the FSS unit cell. The simulated results from CST Microwave Solver indicate that the designed FSS centered at 0.93GHz with band-stop filtering, and the whole dimension of the proposed FSS element is only 9×9mm~2, amount to 0.028λ_0×0.028λ_0, where λ_0 stands for free space wavelength at resonant frequency. Compared with the previous FSSs, the proposed FSS has obvious miniaturized advantages. Besides, the center frequency has scarcely any deviations for different polarizations and incidences wave.