Design of ultra-wideband filter with reconfigurable notches

In this paper an ultra wideband bandpass filter with reconfigurable notches has been presented. It consists of a reconfigurable E to C shaped resonator centrally loaded on a multiple mode resonator (MMR). The MMR is constructed using stepped impedance resonator. Two notch frequencies are created by using reconfigurable E to C shaped resonator in order to reject these two interfering frequencies. Reconfigurability has been achieved by using a switch in the structure. The structure has been analysed for the two states of the switch reconfiguring E to C shape for ON and OFF states. By tuning the length of this reconfigurable E to C shaped resonator, the center frequencies of these notches can be changed.