A Chipless RFID Method of 2D Localization Based on Phase Acquisition

Figure 4

Phase variation as a function of the position on the plan, (a) for the first resonant frequency (3.19 GHz), (b) for the 8th resonant frequency (6.78 GHz), (c) at a frequency located between the first and the second peaks (3.39 GHz), (d) at a frequency located after the 8th peak (7.70 GHz), (e) on the phase unwrapped for the first resonant frequency (3.19 GHz), and (f) on the phase unwrapped for the 8th resonant frequency (6.78 GHz).

(a)

(b)

(c)

(d)

(e)

(f)