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Simulation of a Bandstop Filter with Two Open Stubs and Asymmetrical Double Spurlines

S. Yang

A compact microwave bandstop filter (BSF) with high rejection is proposed. This filter combines a conventional two open stubs BSF and asymmetrical double spurlines. Simulations show this BSF has a wider and a deeper stopband without increasing circuit size, compared with the conventional BSF. This BSF is used to suppress the first harmonics of a parallel coupled banpass filter (BPF). Simulations show deeper suppression compared with the application of a conventional BSF.