Elizabeth Caroline, E.C.Sagadevan, K.Danasegaran, S.K.Kumar, S.2026-02-042022Journal of Electronic Materials, 2022, 51, 9, pp. 5405-54163615235https://doi.org/10.1007/s11664-022-09779-1https://idr.nitk.ac.in/handle/123456789/22431With the fast magnification of terahertz (THz) technology, it becomes necessary to regulate the terahertz wave transmittance resourcefully. THz filters are crucial for managing devices in THz communication. A metamaterial-based THz bandpass filter (BPF) using a complementary split-ring resonator (CSRR) is proposed with the structure of a square in pentagon (SP). The proposed filter provides high tunability over resonant frequency and bandwidth. The result shows that the resonant frequency of the designed filter is 7 THz, a maximum 3 dB bandwidth of 1.6 THz, return loss of − 28.66 dB, low insertion loss of − 0.001 dB, and the transmittance is almost 100%. The proposed THz filters are used in security screening and biomedical imaging. © 2022, The Minerals, Metals & Materials Society.BandwidthMedical imagingMetamaterialsNatural frequenciesOptical resonatorsRing gagesTerahertz waves3 dB bandwidthComplementary split-ring resonatorHigh tunabilityLow insertion lossResonator bandpass filtersReturns lossTera HertzTerahertz applicationsTerahertz filtersTerahertz technologyBandpass filters