Wideband Unequal Filtering Power Divider Without Additional Impedance-matching Circuits at Outputs

A novel class of wideband filtering power divider with full port impedance 50 $\Omega$ and unequal power dividing ratio is presented. Different from the conventional wideband filtering power divider, the load impedances of the proposed power divider are converting to 50 $\Omega$ directly without introducing additional impedance-matching circuits. The power divider is comprised of shared transmission line sections and two impedance transformer sections. By synthesizing the two filtering transformers with load impedance 50 $\Omega$, the impedance transformer sections behind the power dividing junction of the power divider can be decided. The shared transmission line sections in front of the power dividingjunction are determined by synthesizing equivalent Chebyshev impedance transformers with source impedance 50 $\Omega$ at f
0
. Excellent power division and filtering performance are achieved by cascading the two parts. For verification, a wideband 3:1 filtering power divider is displayed with FBW$=$100% and RL=15dB at f
0
=2.4 GHz. The simulated and theoretical results are presented, and good agreements between them are observed.