A Novel Multiobjective Design Technique for LTCC Bandpass Filters with Fractal-Shaped Segments

This paper proposes a new technique for designing bandpass filters based on low-temperature cofired ceramic (LTCC) technology. The proposed method innovatively represents the conductor shape contour of the LTCC bandpass filter with nodes and segments. By defining the distributed nodes' positions, the cross-plane line segment structure with fractal shapes, and applying appropriate node connection schemes, A bandpass filtering structure that ensures effective transmission of in-band signals and effective out-of-band suppression can be constructed. By encoding the shape attributes of nodes and line segments, as well as well-defined multiple objective functions, the multiobjective evolutionary algorithm can be utilized for the optimization design for the proposed filter.