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A size reduced Gysel power divider with simple structure and high design flexibility

In this letter, a new simple structure of Gysel power divider (PD) is proposed. Comparing to the conventional Gysel PD, the high‐power handling capability is reserved with size reduction from the nonlinear relationship between the phase delay and the physical dimension of the utilized open‐circuited coupled line. The structure is analyzed according to an open‐end‐stub‐based equivalent circuit, in which procedure the closed‐form design equations are derived simultaneously. Also, the analysis shows a high design freedom in choosing the values of the isolation resistors and the impedances of the utilized transmission lines (TLs), which property can be used to control the bandwidth (isolation and input return loss band) of the proposed structure. Finally, in order to verify the proposed design theory, a Gysel PD with a center frequency of 2.5 GHz is designed, simulated, fabricated, and characterized. Besides good agreement with the simulation data, the experimental results show that the proposed PD features a wide isolation band which is around 89% with the reference of 15‐dB loss.