Multifunctional frequency converter MMIC for 38GHz band 600Mbps multi-level QAM wireless system

The highly integrated up and down converter MMICs which uses the GaAs_HEMT process with three-dimensional MMIC technology is presented. These frequency converters consists of a balanced mixer, RF band amplifiers, an IF band amplifier, a step attenuator, an active band pass filter and a local quadrupler. A smaller surface mount package of 5 mm × 5 mm × 1.65 mm has also developed and the MMIC chips are mounted in it, respectively. The 38 GHz broadband wireless system as the ultra compact and very light weight has realized by useing these developed MMICs.