Design of dual-band bandpass filters with short-end coupled lines

Novel dual-band bandpass filters are proposed in this paper. With the assistance of symmetrical feeding, the short-end coupled lines are adopted for the main structure of the proposed filter. Moreover, the dual-passband responses are accomplished by integrating two passband filters with the same structure. The theorem for analysis is presented in this paper as well. Finally, measured and simulated results of the fabricated examples match well so that the feasibility of filter configuration has been validated.