A design technique for distributed dual-band bandpass filters

In this paper, a design technique for distributed dualband passband filter is presented. This technique consists in designing two lumped bandpass filters, which are combined into a single one by means of multi-resonant circuits and, then, it is transformed into an equivalent distributed filter. A distributed dual-band Butterworth passband filter, centered at 2.45 GHz and 5.8 GHz, is given as example in order to validate the theoretical study. The simulation results corroborate the potential of the proposed technique.