Design of a Ka -band double balance mixer based on the marchand balun

A Ka-band double balance mxer based on the marchand balun is proposed in this paper. The new design is simulated and validated by the measurement. Measured results show that about 10dB typical conversion loss, high gain compression and about 10dB return loss are achieved across the bandwidth from 27GHz to 44GHz, and LO-to-RF isolations are higher than 20dB.The results of conversion loss and isolation characteristic are the best among the same type mixer operating in ultra wideband millimeter wave frequency band in the reported paper.