A miniaturized wideband microstrip Marchand balun is presented in the paper. The balun is simulated and optimized in ADS and HFSS to evaluate the characterization. The Balun is fabricaded on a double-sided PCB by Rogers's 5880 material. The results show that, the bandwidth of the balun is from 8GHz to 16GHz. The insert loss is within 5dB, and the return loss of the three ports is better than -5dB in the bandwidth. The measured amplitude imbalance and phase difference between the two balanced output ports are within 1dB and 10° over the whole frequency band.
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