Near-Field HF-RFID and CMA-Based Circularly Polarized Far-Field UHF-RFID Integrated Tag Antenna

Figure 3

The simulated total magnetic fields of HF-RFID square spiral structure when varying distance. (a) 0 cm, (b) 2 cm, (c) 3 cm, (d) 4 cm, (e) 5 cm, and (f) 6 cm.

(a)

(b)

(c)

(d)

(e)

(f)