Novel microwave band-pass filter with dual-mode triangular resonators

Microstrip filters with dual-mode triangular resonators having two transmissions zeros, one on each side of the passband, are investigated. The investigation refers to the physical understanding of the behavior of a triangular loop resonator. The effects of varying different parameters of this filter structure were studied. Some filters of this type were designed and tested by simulation. An experimental model of such a filter has been measured. Simulation and measurement results are in good agreement.