Design of a miniaturized dual-band Frequency Selective Surface for Wi-Fi Applications

In this paper, a compact frequency selective surface (FSS) with dual-band stop feature is introduced for shielding the 2.4 GHz and 5 GHz Wi-Fi bands. The FSS comprised of metallic patches and meanders on both sides of the dielectric substrate. Moreover, the metallic patterns on both layers are connected through the vias. The designed structure has miniaturized unit size of 0.048 lambda(0) x 0.048 lambda(0), where lambda(0) is the free space wavelength at the lower resonating frequency of 2.4 GHz. The proposed structure is polarization independent due to the 90 degrees rotational symmetry of elements on the top and bottom side of the substrate. The corresponding surface current and electric field distribution is illustrated to comprehend the resonance behavior of the structure. The compact unit cell, low thickness, angular stability for both the TE and TM polarization are the eminent attributes of the proposed design.