Extremely low profile UHF RFID TAG antennas for identification of people

Three prototypes of the very low-profile TAG antennas for UHF RFID of people were designed, as result of the long-term development. Their performance properties from the wearability point of view were step-by-step improved. The height were decreased from 1.82 to 0.76 mm (0.0022 λ0 at 869 MHz). The weight were decreased from 38 to 10 g, The gain of antennas measured with enclosed human phantom is in the range of 0.6 ÷ 1.6 dBi. Identification range in real conditions in 4 and 2 m wide buildings corridors reaches 7 and 17 m, respectively, with the NXP Semiconductors chip with the sensitivity of-14 dBm.