Small-Size Wearable High-Efficiency TAG Antenna for UHF RFID of People

Table 1

Impedance and radiation properties of the vertically folded coupled patches RFID antenna at frequency 866 MHz.

	Transmission coefficient (—)	Radiation efficiency (%)	Total efficiency (%)
Measurement, free space	0.9	75	66
Measurement, agar phantom	0.8	65	51
Simulation, free space	1.0	66	51