2. Hardware architectures

2.1 Energy-efficient solutions

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2.1.1 General

In terms of both the environmental footprint and autonomy of these wireless sensors, the energy consumption of the radio frequency systems equipping them is now an inescapable issue that complicates the task of designers. Ultra-broadband technologies are one of the most promising solutions, but antenna size and reuse of the same frequency band remain limiting factors to date. On the other hand, millimeter-wave frequencies around 60 GHz are becoming increasingly attractive...