... source: ambient energy [1]. 1.1. Ambiant energy & applications Four main ambient energy sources are present in our environment: mechanical energy (vibrations, deformations), thermal energy (temperature ... variations), radiant energy (sun, infrared, RF) and chemical energy (chemistry, biochemistry). These sources are characterized by different power densities (Figure 2). Energy Harvesting (EH) ... consequence, Energy Harvesting can become a viable supply source for Wireless Sensor Networks of the future. Small-Scale Energy Harvesting 94 (a)µCµCsensoremitterambient energy bufferT°,...