Filtering power divider for differential input and output signals

A power divider with differential input and output ports is proposed in this paper. The proposed power divider consists of three coupled resonators and exhibits a bandpass filter response. Good frequency selectivity could hence be obtained. A 2.45-GHz differentially operated power divider has been fabricated on an RO4003C substrate and measured by a vector network analyzer. The measured data as well as the simulated results show that the power divider has a better frequency selectivity compared with a traditional one. From the simulated current distribution, the differential operation at the output ports with the differentially input signal could be validated.