Design of miniaturized dual-band frequency selective surface with spiral arrangement of meander lines

A miniaturized dual-band frequency selective surface (FSS) is proposed in this letter. The FSS unit cell is composed of meander lines arranged spirally, and produces resonant frequencies of 1.42 GHz and 3.76 GHz with -3 dB bandwidths of 0.95 GHz and 0.49 GHz. The equivalent circuit model is introduced to explain the FSS performance. The meander lines at top and bottom layers are connected through copper vias to increase the equivalent inductance and capacitance of the FSS unit cell. The dimension of the unit cell is 10 mm, which is about 4.79% of the wavelength at the first resonant frequency. Simulation results show that the proposed FSS can work stably at resonant frequencies for both TE and TM polarizations while the incidence angle varies from 0 to 60 degree. A prototype of the FSS is fabricated and measured. The measurement results show reasonable agreement with the simulated results.