Dielectric Resonators Band Pass Filter with High Attenuation Rate.

A bandpass filter with high attenuation cut off has been realized by cascading a bandpass filter containing dielectric resonators and a two dielectric resonators bandstop filter. The filter response has a higher cut off attenuation rate [26 db/10 MHz) compared to the original bandpass filter (14 db/10 MHz). The attenuation characteristics and return loss response show that the bandpass and the center frequency remain inchanged at 40 MHz and 4.015GHz respectively. The insertion losses are low (1db).