We discuss in this paper about the recent development of Antennas on Chip (AoC), especially in the context of emerging applications in the millimetre wave frequency range, like WLAN @ 60Ghz, automotive radars (76-81GHz) as well as imaging system (94Ghz), ... Limitations due to the specific environment of such antennas integrated on Silicon are described and analysed first. Then, we focus on the different approaches which can be investigated for enhancing the performances of such highly integrated radiating modules, especially dedicated to future SiP (System in Package) and SoC (System on Chip) chips for RF microelectronic.