LTCC Distributed-Element Bandpass Filter with Multiple Transmission Zeros Using Non-Resonating Node

摘要

A distributed-element low temperature co-fired ceramic (LTCC) bandpass filter (BPF) with multiple transmission zeros using non-resonating node (NRN) is proposed. By fully taking advantage of the LTCC technology in 3-dimentional (3-D) environment, the employed dual-mode stub-loaded stepped-impedance resonator (SIR) and the NRN are reasonably folded, and miniature circuit size can be obtained. Meanwhile, four transmission zeros are produced in both sides of the passband to realize sharp rejection skirts. For demonstration, a four-pole LTCC BPF using the NRN centered at 3.65 GHz is designed, fabricated and measured. Simulated and measured results are presented, showing good agreement.