A novel Gysel power divider design with uniform impedance transmission lines for arbitrary power-dividing ratios

A novel Gysel power divider with uniform impedance transmission lines is presented. The arbitrary power-dividing ratio is obtained only by adjusting the electrical lengths of the transmission lines, avoiding the use of high impedance lines that are involved in the conventional Gysel power divider design with large power-dividing ratio. All the transmission lines are with the same characteristic impedance, which is independent of the power-dividing ratio and provides a freedom to control the operation bandwidth. For verification, a 9:1 Gysel power divider operating at 1 GHz is designed, fabricated, and measured. The measured results are in good agreement with the simulated ones. The measured results show a bandwidth of 13.7% with better than 20 dB return loss and 29.2 dB isolation from 0.95 to 1.09 GHz.