Wireless Sensing Based on RFID and Capacitive Technologies for Safety in Marble Industry Process Control

Figure 16

Reception ratio versus tag-reader distance for the 𝑖th emitted power level (1/64 mW, 1/16 mW, 1/4 mW, and 1 mW, resp., PWR₀, PWR₁, PWR₂, and PWR₃).