ANALYSIS AND DESIGN OF MULTIPLE-BAND BANDSTOP FILTERS

—A new,transverserval coupling network is proposed to design of multiple-band bandstop filters. The resonators in the proposed transversal coupling network have a few of center frequencies and some of them,have similar or the same resonating frequency to realize multiple-band bandstop suppression, which are applied to reject pulse signals or bandwidth,signals in broadband,technique applications. A triple-band bandstop filter is designed by adopting substrate integrated waveguide to demonstrate the feasibility of this proposed network.