Differential unequal power divider with bandpass response

In this paper, a differential unequal power divider with bandpass response has been for the first time proposed. With suitable design of the inverters' impedances, power dividing ratio of the differential power divider could be assigned and realized. A differential, filtering 4:1 power divider has been realized and measured. Bandwidth of return loss is 8%. The input return loss is better than 15 dB at the center frequency and in-band isolation is better than 20 dB. Wideband common-mode rejection of 30 dB is also obtained.