Design of Low-Temperature Co-Fired Ceramic Bandpass Filters With Modified Coupled Inductors

With the assistance of modified coupled inductors, novel multilayered bandpass filters are developed in this paper. Two or three transmission zeros appear on both sides of the passband skirt easily by incorporating the proposed structures. In order to fabricate compact multilayered bandpass filters, the low-temperature co-fired ceramic technology is also employed. In addition, the equivalent circuits of the modified coupled inductors are also proposed. Consequently, the measured results of the fabricated bandpass filters agree well with the responses of the full-wave electromagnetic design.