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A new topology of the power dividers is proposed, which has both good isolation performance and tunable wideband filtering. Based on the Wilkinson structure, on the one hand, to achieve good performance wideband port-to-port isolation, the two output ports are first connected in parallel through a resistor, and then through a quarter-wavelength parallel coupled line and transmission line. On the other hand, in order to realize the tunable wideband filtering response, a reconfigurable wideband filtering branch is formed, including stepped impedance open-circuit stubs, parallel coupled lines, and t-type tunable reflectors. The power divider prototype is theoretically calculated and verified by the odd-even mode method. The measurement results show that the tunable wideband filtering power divider centered at 3 GHz with a 66.7% fractional bandwidth, output port isolation maximum 15.8 dB, a return loss greater than 15 dB, while achieving wideband tunable in the range of about 0.6 GHz.

Reconfigurable wideband filtering power divider with good isolations performance