High-Performance 94-GHz Single-Balanced Diode Mixer Using Disk-Shaped GaAs Schottky Diodes

摘要

We present a high-performance 94-GHz single-balanced monolithic millimeter-wave integrated-circuit (MMIC) mixer using the disk-shaped GaAs Schottky diodes grown on an n/$hbox{n}+$ epitaxial structure. Due to the superior characteristics of the GaAs diodes with high diode-to-diode uniformity, the mixer shows a conversion loss of 5.5 dB at 94 GHz, a 1-dB compression point $(P_{1 hbox{-}{rm dB}})$ of 5 dBm, and high local-oscillator to radio-frequency isolation above 30 dB in an RF frequency range of 91–97 GHz. To our knowledge, the fabricated mixer shows the best performance in terms of conversion loss at 94 GHz and $P_{1 hbox{-}{rm dB}}$ among the W-band MMIC mixers without amplifier circuits.