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The design of a novel compact out-of-phase unequal power divider is presented. By employing a special parallel dual striplines (PDSL) structure, out-of-phase unequal power divider is realized. The out-of-phase characteristic between the two output ports is frequency independent owing to this special structure, and the unequal power-dividing ratio can be easily obtained avoiding high impedance transmission lines like conventional power divider. At last, a 2:1 out-of-phase PDSL power divider has been designed, fabricated and measured. The experimental results show good agreement with simulated ones.