Unequal Wilkinson power dividers with in-/reverse-phase using lumped-element circuits

In this paper, we propose in/reverse-phase Wilkinson power dividers with unequal power-split ratio using lumped-element circuits. Although unequal Wilkinson power dividers using the defected ground structure (DGS) have been reported, impedance mismatch between DGS lines and conventional microstrip lines, and radiation may become problems. The proposed divider consists of parallel pi /T-networks and LC-ladder circuits. The designed reversed- phase divider with a power-split ratio of 4 has a practical property of a relative bandwidth of about 14 %. The validity of this design procedure is also shown by EM-simulations and experiments.