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In this paper, a broadband single balanced mixer is presented using a wideband rat-race implementation by vertical coupler. Frequency is selected as 1.5∼3 GHz for RF, 1.64∼3.14 GHz for LO, and 140 MHz for IF signals. When LO signal with 6 dBm at 2.7 GHz is injected, a conversion loss of 7.5 dB and RF to LO isolation of -30 dB are obtained. Also, an average conversion loss of 10 dB and RF to LO isolation of -27 dB are obtained for frequency band of 1.5∼3 GHz.