Deliverable D5.3 Initial design and validation of technologies and architecture of 6G devices and infrastructure Hexa-

Various technologies are expected to support 6G. The first design results are illustrated in four main directions. First, sub-THz architectures are considered. Dimensioning for energy efficiency is illustrated and hardware non-idealities are reviewed, with a special focus on phase noise. Alternative architectures based on resonant tunneling diodes or lens antennas are also explored. Second, reflective intelligent surfaces are considered. Radiation models are created, validated against prototypes, and the main features and control functions are identified. Third, system-on-chip architectures are explored. They combine DSP cores such as RISC-V and AI accelerators. Energy harvesting and power management aspects are also considered. Fourth, ultra-low cost and power IoT devices are investigated. They combine many technologies such as power-saving protocols, energy harvesting from multiple sources, tiny ML engines. Backscattering demonstration is progressing for zero-energy devices.