NOVEL BAND-NOTCHED UWB BANDPASS FILTER USING MICROSTRIP/SLOTLINE RING RESONATORS

A novel ultra-wideband (UWB) bandpass fllter (BPF) with notched band based on microstrip/slotline ring resonators is presented in this paper. The UWB BPF is fabricated with two microstrip ring resonators on the top copper layer and a slotline ring resonator on the bottom ground layer. Thus, an ultra-wide passband can be achieved owing to the coupling efiects and microstrip/slotline transitions of these three ring resonators. Then, a notched band which is created at 8.0GHz for satellite communication system is designed based on loaded short-circuited stubs. Both the simulated and measured results show that this compact UWB BPF has good performances of wide passband and notched band.