Highly linear and compact MMW phased array transmitters [MMIC power amplifiers]

In this paper, we describe more extensive linearity measurements (OIP3, NPR, ACPR) of multistage compact MMIC power amplifiers for future phased array transmitters at MMW frequencies. As an example, extremely high 500 mW/mm P1dB with 24% PAE at P1dB (peak PAE of 30% at Psat) and greater than 4 W/mm OIP3 were achieved on a 24-27 GHz HEMT MMIC with a compact size of 5.88 mm/sup 2/. ACPR (-37 to -40 dB) and NPR tests (>18 dB at OBO of 4.5 dB) confirm the linearity and power capability of the technology. These MMICs provide leveraging performance for highly linear single beam and multibeam phased arrays for satellite, airborne and ground communication links.