In this letter, a novel unequal power divider (PD) with three standard 50- $\Omega $ ports is presented. It consists of two transmission line (TL) sections, two resistors, and a general isolation topology (GIT). Through analyzing voltages and currents of each branch, the constraint conditions of such a GIT are newly established. Considering realization of GIT, two types of topologies, i.e., asymmetrical coupled line and cascaded TL, are selected for verification. From the design charts and several design examples, the proposed PD could not only provide high power ratio $k^{2}$ with compact size but also independently adjust their fractional bandwidths ( $S_{11}$ or $S_{32})$ with the same power ratio $k^{2}$ . Finally, an unequal PD with the power ratio $k^{2}$ $=$ 8 is fabricated, and the measured results meet the simulated results very well.