Dipole loaded complementary Frequency Selective Surfaces

Complementary Frequency Selective Surfaces (CFSS) are compact structures which are highly stable with respect to the angle of incidence. CFSS is formed by combining a layer of band pass filters (aperture layer) and an array of band stop spatial filters (for example, dipole). The concept is inspired from Babinet´s principle and by placing these two complementary structures on either side of a thin dielectric, a strong interaction between these layers occurs. This interaction leads to a decrease in the pass band resonant frequency of the CFSS. In this work, this pass-band resonant frequency is further lowered by adding an additional layer of dipole on the other side of the CFSS aperture layer. The new configuration is dipole-dielectric-slot-dielectric-dipole layer and we name this structure as dipole loaded CFSS.