Compact Wideband Modified Wilkinson Filtering Power Divider with Wide Upper Stopband

A compact wideband modified Wilkinson-type filtering power divider (MWFPD) with wide stopband is presented. The MWFPD is developed by cascading a modified Wilkinson power divider (MWPD) and a filtering section constituting stepped-impedance resonator (SIR)-loaded three-coupled lines (TCLs). The arms of the MWPD also consist of SIRs. By suppressing harmonics using a single open stub at the input port only, the upper stopband is extended up to 20 GHz with 20 dB rejection. The designed MWFPD has also been fabricated to verify the mathematical and electromagnetic simulation results. The measured results exhibit an excellent agreement with the predicted results. The center frequency of the fabricated circuit has been measured at 4.36 GHz with a fractional bandwidth (FBW) of 44 %. The proposed MWFPD not only exhibits competitive performance but also provides ease of fabrication and design.