Design and experimental verification of band-pass frequency selective surface based on metamaterial effective medium theory

By adjusting the effective permittivity of the unit cell,a new method of constructing metamaterial band-pass frequency selective surface was proposed.The effective permittivity of continuous conducting wires is negative below the plasma frequency and thus a stop-band occurs.By combining the continuous conducting wires with cut wires,we realized a one-dimensional frequency selective surface.Both the theory analysis and simulation results demonstrated the facility and feasibility of the method.We also designed a wide-angle and polarization-independent frequency selective surface based on this method.Two samples were fabricated to validate the proposed method;the experiment results were fairly consistent with the simulation results.The proposed method eliminates the complicated calculation and excessive parameter optimization process.It paves a new way of designing frequency selective surfaces and is of important reference values for fabricating THz frequency selective surface as well as multi-band,tunable and miniaturized frequency selective surfaces.