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

Figure 4

Simulated input impedances versus the distance between the rectangular spiral coil and patch-meander-line dipole.

(a) Input resistance and reactance of the rectangular spiral coil versus the distance at 13.56 MHz

(b) Input resistance and reactance of the patch-meander-line dipole versus the distance at 922.5 MHz