A Compact Wideband Lumped-Element Wilkinson Power Divider Using Inverting Coupled Coil

This letter presents a lumped-element wideband Wilkinson power divider (WPD) with C- L - C pi-network. Based on the inverting coupled coils and capacitive loading, the proposed WPD can achieve compact circuits and wideband performance. The design equations for the proposed WPD are derived by even-odd modes analysis techniques. As an example, a WPD using Rogers 4003C is implemented for verification. The measurement and simulation results are presented to confirm the theory's validity. The compact size of the power divider is 0.165 lambda g x 0.0625 lambda g without input and output transmission lines (TLs). The power divider has a minimum insertion loss (IL) of 0.47 dB. The measured isolation is greater than 16 dB, and return loss (RL) is better than 15 dB over a range of 0.88-2.02 GHz and a relative operating bandwidth of 78.6%.