Dual-Band Bandpass Filter with Ultra-Wide Upper Stopband Using Slow-Wave Dual-Resonance Cells

摘要

with a compact structure. Moreover, the strong slow-wave effect can be introduced by the proposed cell, which leads to an ultrawide upper-stopband bandpass filtering response. To verify the operational mechanisms, an ultrawide upper-stopband BPF with two passbands centered at 3.15 and 3.85 GHz is designed and fabricated, which exhibits a upper-stopband more than 11.5 times of the first resonance