A multi-octave microstrip balun double balanced mixer has been developed. This mixer which is consisted of a broad-band balun and a diode ring exhibits extremely encouraging performance. Within the multi-octave bandwidth from 1 to 18 GHz, the average DSB noise figure is 6 dB, and the maximum DSB noise figure is 8.7 dB, and both LO-RF and LO-IF isolations are more than 15 dB.
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