For 5G mobile communication and satellite communication systems, the mmWave frequency is gaining increasing importance. The phased-array antenna system is crucial for both applications. In this presentation, the speaker will discuss the difficulties encountered during the design and production of antenna-in-package modules. He will also demonstrate an innovative concept for a phased array antenna system with a high EIRP by integrating a GaN power amplifier with the array system. The integration of GaN power alloWS- for an increase in channel power, which reduces the number of antenna elements, and an increase in PA efficiency to 30%. The general efficiency of silicon-based PAs is approximately 5%. In the concluding segment of this presentation, the speaker will introduce XB eam, the quickest mmWave OTA testing solution. It takes less than 10 seconds to measure the beam pattern of a single antenna.