Design of Compact Dual-Band Filter in Multilayer Ltcc with Cross Coupling

A very compact low temperature co-fired ceramic (LTCC) dual-band filter is designed based on the proposed novel cross-coupling structure in this paper. A six-pole dual-band filter with four transmission zeros is synthesized using an analytical procedure. By incorporating the proposed novel cross-coupling structure and analyzing the coupling characteristic, the dual-band filter is realized with canonical topology in multilayer LTCC. It is demonstrated by the simulation and experiment that the proposed dual-band filter has both compact size and good selectivity.