Compact microstrip bandpass filter with fragment-loaded resonators

Microstrip bandpass filter with fragment-loaded resonators is proposed and designed using multiobjective evolutionary algorithm based on decomposition combined with enhanced genetic operators (MOEA/D-GO). When loaded by fragment-type structures, microstrip resonators may have compact size and operate at different modes. By properly setting the modes of fragment-loaded resonators in objectives of MOEA/D-GO, stopband attenuation and spurious passband suppression of the microstrip bandpass filter can be readily adjusted and controlled. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2896–2899, 2014