Ultra-Wideband (UWB) Bandpass Filter using Optimum Short Circuited Technique

Filters are the key components in communication system. In this paper, the description of Ultra Wide Band filter design techniques and to show the different aspects of the design technique used. This paper presents a novel ultrawideband (UWB) bandpass filter using stepped impedance stub loaded resonator and the stub loaded Multiple-mode resonator. The resonators are so formed to allow its five resonant frequencies in the UWB passband, which extends from 3.1 GHz to 10.6 GHz. SISLR is found to have the advantage of providing more degrees of freedom to adjust the resonant frequencies. The MMR is constructed by loading three open stubs in a uniformimpedance resonator, i.e., one stepped-impedance stub at the center and two uniform-impedance stubs at the symmetrical side locations. The simulated results showing good wideband filtering performance with sharp rejection skirts outside the passband.