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This paper proposes a general synthesis method for inline mixed coupled quasi-elliptic bandpass filters based on resonators. Different from the conventional modeling with lumped and mixed inductive and capacitive coupling, the proposed mixed-coupling model here includes not only the coupling magnitudes, but also their paths’ phases inside the mixed coupling. According to the presented formulation,...
This paper presents a unified coupling-matrix synthesis method for microstrip quadruplet bandpass filter on λ/4 resonators. The mainline is implemented with cascading four λ/4 resonators via alternative J and K inverters, while the weak cross coupling path is created with a J inverter between the 1st and 4th λ/4 resonators. The resultant bandpass filter features a generalized Chebyshev in-band frequency...
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