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Wideband Out-of-Phase Power Divider with Large Power Division Ratios

An out-of-phase power divider with large power division ratios and broadband response is realized in this paper based on the double-sided parallel-strip lines with an inserted conductor as a virtual ground. The wideband performance is achieved through sacrificing the perfect isolation and return loss at the main frequency by modifying the impedance of only two transmission lines. Using a third order approximation based on the least squares fitting method, the need for optimization of the two targeted transmission lines producing wideband response is bypassed. To substantiate the design method and equations, a circuit with 25:1 power division ratio in conjunction with 80% operational bandwidth referring to 15 dB return loss and isolation is developed. The measured results show the maximum 0.8 dB amplitude deviation from the specified power division ratio with a phase difference between the output ports of 180±5°.