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a 38-48-GHz miniature sub-harmonically pumped mixer has been developed using GaAs 0.15-m pHEMT technology. An anti-parallel diodes pair is used for frequency conversion with a low LO input power. Quasilumped matching topology is employed to minimize the chip size and cost. The mixer is fabricated in chip size 0.85 0.85 mm 2 , and exhibit 12-15-dB up-conversion loss and 11-16-dB down-conversion loss with 10 dBm LO power.

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