In this study,double-layer S-shaped metamaterials(MMs)are analyzed by terahertz time-domain spectroscopy.These materials exhibit narrow bandstop and broad bandpass transmission properties at both horizontal and vertical electric-feld polarizations.A 117%increase in the unloaded quality factor is experimentally observed for these materials.The center frequency is approximately 0.45 THz,with a 3-dB bandwidth of 0.52 THz from 0.20 to 0.72 THz at normal incidence.The measured average insertion loss is 0.5 dB with a ripple of 1 dB.These results show that double-layer S-shaped MMs are efective in designing tunable terahertz devices. In this study, double-layer S-shaped metamaterials (MMs) are analyzed by terahertz time-domain spectroscopy. These materials exhibit narrow bandstop and broad bandpass transmission properties at both horizontal and vertical electric-feld polarizations. A 117% increase in the unloaded The quality factor is experimentally observed for these materials. The center frequency is approximately 0.45 THz, with a 3-dB bandwidth of 0.52 THz from 0.20 to 0.72 THz at normal incidence. The measured average insertion loss is 0.5 dB with a ripple of 1 dB. These results show that double-layer S-shaped MMs are efective in designing tunable terahertz devices.