UWB bandpass filter with notch-band based on transversal signal-interaction concepts

Presented is a structure to design a compact ultra-wideband (UWB) bandpass filter (BPF) with excellent selectivity that enables inclusion of notch-band characteristics within the filter´s passband to mitigate interfering signals that coexist within the UWB spectrum. The proposed filter topology utilises two signal paths with different electrical lengths made up of two wideband BPFs that are connected in parallel. The mechanism of generating notch-band is delineated based on transversal signal-interaction concepts. Good agreement is observed between simulated and measured performances of the UWB filter, demonstrating a fractional bandwidth of 123´ (2.66´11.2 GHz) with a sharp notch-band at 5.21 GHz.