gan 78ANTPS-78. ANTPS-78 is a long-range S band (IEEE desnation) or in the EF band (NATO desnation) air surveillance radar desned for detection of hh-speed and hh-altitude targets in challenging environmental conditions..After the first attempts of selective area growth (SAG) of GaN [78], [79], this process has been proposed for different purposes, such as for the fabrication of non-alloyed Ohmic