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This letter proposes a novel ultra-wideband (UWB) bandpass filter (BPF) using a ring resonator with improved in band and out-of-band performances. A ring resonator is structured to equally allocate its first three resonant frequencies in the 3.47–10.47-GHz UWB band. Two capacitive-ended interdigital coupled lines are then made up to assign their transmission zero towards the fourth-order resonant...
A novel compact microstrip line ultra-wideband (UWB) bandpass filter (BPF) using the proposed stub-loaded multiple-mode resonator (MMR) is presented. This MMR is formed by loading three hourglass stubs in shunt to a high impedance microstrip line in center and two symmetrical locations, respectively. By properly adjusting the dimensions of the stubs, the first four resonant modes of this MMR can be...
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