Abstract

A compact microstrip bandstop filter is proposed with wider stopband and larger insertion loss. By adopting coupled lines added with open stubs connected at the input and output port of the bandstop filter, the selectivity and stopband rejection can be increased significantly. Moreover, the attenuation level can be controlled by choosing the resonant frequencies of four resonators. This bandstop filter is fabricated with 14.75% fractional bandwidth for measuring at the stopband of 50 dB.

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