Tri‐bandpass filter based on two stepped impedance resonators

A novel approach for dual- and tri-band bandpass filters (BPF) design with independently controlled center frequencies and bandwidths was presented. On the one hand, a stepped impedance resonator (SIR) is designed to operate at the center frequencies of two bands simultaneously (dual-band), on the other hand, two SIR s are designed to operate at the center frequencies of three bands simultaneously (tri-band). To verify the proposed approach, a tri-BPF has been designed and fabricated with printed circuit board technology. The measured results are in good agreement with the simulation results. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1765–1768, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26868