Design and implementation of fully 3D miniaturized passive UHF RFID tag for sensing applications

In this paper, we present a 3D passive UHF RFID tag that is fabricated utilizing direct write printing method. The dual antennas tag is printed using the dispensing technique on a wooden cube with dimension of 8 cm3 (2 cm × 2 cm × 2 cm), which is the smallest RFID tag fabricated in 3D structure so far. The narrow-line tag antenna has a near-isotropic radiation pattern which enabling the tag with full visibility. The antenna design and design parameters are quantified using numerical simulations. A prototype model of tag is manufactured to validate the simulation model. The simulation and measurements results show the read range about 2 m (100 times the tag dimension) in 360° around the tag.