A Novel Notch System Having Two Stopbands Based on Duplexer for Broadband Applications

This letter presents a novel notch system having two independent stopbands to satisfy the complicated requirements of broadband applications. The undesired interaction between the spurious responses of the first stopband and the desired bands (broad passband and the second stopband), which is difficult to be handled with traditional designs, is eliminated by the isolation feature of a duplexer pai...