Controllable and wide spurious suppression power divider with a bandpass-filtering and high isolation

This article presents a bandpass-filtering power divider with a controllable and wide spurious frequency. The proposed structure consists of four stepped-impedance resonators (SIR) that are directly coupled to the output ports of the power divider with an electrical length of θ. The spurious frequency can be controlled by changing the ratio of the SIR. Moreover, the isolation resistor provides an effective isolation between the output ports and an effective output return loss over wide stopbands. For the experiment validation, the power dividers with the stepped-impedance ratios of 0.83 and 1.43 were designed, fabricated, and measured at the center frequency of 2.6 GHz. The measured results are in good agreement with the simulated results.