This paper presents a circuital approach to design a Frequency Selective Surfaces (FSSs) spatial filter. Spatial filter is used to extract the electromagnetic waves in spaces. A conducting sheet perforated with apertures or an array of periodic metallic patches constitute FSSs and it is usually designed to provide four standard spectral response: low-pass, High-pass, band-pass and band-reject. Circuital approach is used to develop a better understanding of FSSs and to attain correct model. A band-pass filter with frequency range from 2GHz-8GHz and band-stop filter with frequency range from 6GHz-13GHz was designed using FSSs. Properties of FSSs are evaluated through simple and accurate equivalent circuit. Simulation results for both filters are produced using Agilent ADS software. © 2015 IEEE.