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In this paper, an ultra-wideband (UWB) bandpass fllter (BPF) with a notch-band at 5.8GHz is presented. The proposed fllter is constructed with multiple-mode resonator (MMR) using novel dumbbell stubs and one-arm-folded interdigital coupled lines in the input and output sides. The MMR consists of three pairs of shunt dumbbell stubs and a high impedance microstrip line. By adjusting the dimensions of the dumbbell stubs, the resonant modes of MMR are allocated in the UWB band. The arm-folded interdigital coupled lines are used to obtain a notch-band at 5.8GHz. Finally, the proposed UWB BPF is fabricated. The simulated and measured results are in good agreement with each other.

AN ULTRA-WIDEBAND BANDPASS FILTER WITH A NOTCH-BAND AND WIDE STOPBAND USING DUMBBELL STUBS