Design of a dual-band bandpass filter with low-temperature co-fired ceramic technology

A novel dual-band bandpass filter with low-temperature co-fired ceramic technology is proposed in this paper. By adopting the structure of an asymmetrical short-circuit coupled line, two open-stub lines, and two reactances, the transmission zeros, which increase the degree of isolation between the passbands, will easily appear at the higher side of two passband´s skirts. The analysis of theorem and the procedure of design are described. The measurements of fabricated units match well with the electromagnetic simulation results, which is an evidence of the feasibility of the proposed filter configuration