We develop terahertz mixers with monolithic integrated circuits containing balanced, series and antiparallel pairs of Schottky diodes. The designs of these mixers and a method for studying their parameters are described. The best results are obtained for the antiparallel diode pair. In this case, the double-sideband noise temperature of the receiver amounts to 5600-7500 K when operating at the second heterodyne-oscillator harmonic near the frequency 0.71 THz.
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