In modern wireless communication systems, microwave filters or RF filters are required to be smaller and smaller in size, and higher and higher in performance. Filters constructed on multi-layer substrates draw wide attention for the advantages of higher integration level. In this thesis, the technique for the design of stacked-LC band-pass filters constructed on multi-layer substrates is investigated. The main innovations are as follows:(1) Designing a compact second-order multi-layer dielectric structural band-pass filter with two finite transmission zeros. Circuit and multi-layer dielectric structural models are putted forward.(2) Designing a cascaded band-pass filter, proposing a method to achieve better performance by introducing a two-layers feedback capacitance. Filter performance is significantly improved,with about 50dB stop-band rejection. Pass-band transmission and reflection response performs well.Currently , multilayer substrates structural filter research has achieved a lot , but mostly confined to second-order filter prototypes, with stop-band rejection about 20dB or even lower, This thesis designing a stacked-LC second-order filter with two transmission zeros which has good performance (about 20dB rejection stop-band). In depth, achieving cascaded-filter with second-order filter, improving filter to a higher performance (stop-band rejection up to 50dB, and with 4 transmission zeros in one side of the stop-band). |