Spurious resonance suppression for a THz single bandpass filter using lossy glass substrates

Abstract

ABSTRACTNarrowband metamaterial‐based filters using an array of split ring resonator (SRR) unit cells exhibit multiband operating characteristics due to the low frequency L‐C resonance together with the high frequency dipole resonance of the SRR structure. To obtain single‐band characteristics from the metamaterial‐based terahertz (THz) band pass filter (BPF), the unwanted dipole resonance at high frequency should be suppressed. A lossy glass was used for a substrate for THz BPF that consists of a complementary split ring resonator (CSRR) to suppress the undesirable resonances at higher frequencies. The resulting CSRR filter on a glass substrate exhibited single‐band BPF characteristics with a spurious band rejection ratio over 50 dB. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:58–60, 2015