Dual polarised wideband metamaterial radar absorbing screen based on resistive Hilbert curve array

A novel thin metamaterial wideband radar absorber formed by two layers of resistive Hilbert curve arrays is reported. HFSS simulations reveal a reduction in the monostatic radar cross-section of more than 10 dB from 8 to 18.8 GHz (81% fractional bandwidth) for Ex and 9.1 to 20.7 GHz (78% fractional bandwidth) for Ey polarisations, respectively. This bandwidth is significantly wider than those reported so far for space filling curve array based absorbers. The structure has a thickness of only 0.17λ at fo (14.2 GHz). The lateral dimensions are only 0.2λ×0.2λ per unit cell at fo, which is several times smaller than that of recently reported circuit analogue absorbers operating in the similar frequency band, thus suppressing diffraction effects.