Wideband Highly Selective Unequal Power Divider

In this article, a novel broadband unequal power divider with high selectivity is introduced, which is composed of two filtering branches and an isolation resistor. Two general wideband filtering branches are constructed by cascading λ/4 transmission lines and triple-mode resonators. To design in-band constant k
²
, each filtering branch is designed with the same filtering specifications (FBW and RL) and different impedance transforming ratio (γ). When the impedance of the leading λ/4 transmission line is designed to be proportional, the isolation resistance is introduced without loss. To verify the feasibility, a power divider working at 1 GHz with a bandwidth of 30% is realized, and the isolation |S
23
| is better than -22 dB. On this basis, a four-way power divider with a power division ratio of 1:2.2:4.5:6.3 is also designed.