Design of a dual-bandpass filter with dispersive coupling

In this paper, we intend to design of a wide band dualband filter with dispersive couplings for improved selectivity. The proposed approach consists to use this novel filter synthesis technique, taking advantage of the frequency variation of coupling values, for generating additional transmission zeroes. The dispersive coupling behavior is demonstrated and employed to design a four pole filter with three transmission zeros. The design is validated by a prototype and a six-pole dual-band bandpass filter based on the same concept is proposed for 5G millimeter-wave bands.