Comments on “A Continuously Tunable Unequal Power Divider With Wide Tuning Range of Dividing Ratio”

The power-dividing ratio analysis by Ye et al. is based on an inadequate equivalent circuit and neglects the effect of the isolation resistor. It is shown that the isolation resistor should be included for the power-dividing analysis and the exact analysis results are presented for the power-dividing ratio. According to the exact analysis, the wide tuning range of the power division ratio claimed by Ye et al. is sharply reduced including the effect of the isolation resistor.