A Novel Antenna Design of Compact HF and UHF Passive RFID Tags with Interconnected Structure for Energy Harvesting and Tracking Systems

Figure 5

Simulated results of the dual-band passive RFID tag antenna.

(a) Input resistance and reactance versus frequency at the HF band

(b) Magnitude of reflection coefficient versus frequency

(c) Magnetic field intensity at 13.56 MHz

(d) Input resistance and reactance versus frequency at the UHF band

(e) Magnitude of reflection coefficient versus frequency

(f) Radiation patterns at 922.5 MHz

(g) Antenna realized gain at UHF band