Wideband filtering power dividers with/without notch band

Low loss and compact wideband filtering power dividers (WB-FPDs) with/without notch band are proposed. The WB-FPDs are designed using wideband bandpass filter based on asymmetric stepped-impedance resonator (SIR). Parallel coupled microstrip lines are used to create both wideband filtering characteristic and two additional transmission poles. A notch band can be generated at upper passband edge by using open-circuited stubs on the SIRs. The WB-FPDs with/without notch band are successfully designed, fabricated, and tested. The wide passband is centered at 4 GHz with the fractional bandwidth (FBW) of 51.1%, while the notch band is at 5.56 GHz with the FBW of 3.1%. Good agreement between the simulated and measured results is observed.