Wearable Dual-Band Quasi-Yagi Antenna for UHF-RFID and 2.4 GHz Applications

A compact wearable dual-band quasi-Yagi RFID-reader antenna is designed for being incorporated into a smart glove. The antenna dual-band capability allows the integration of both the RFID reader at UHF band and a wireless data link at 2.4 GHz, into a single compact and wearable device. Dipole and loop antennas are combined into a quasi-Yagi structure to be placed on a hand back, in order to detect tagged objects close to the hand palm and fingers, during the operator normal activities. The dual-band driven element consists of a rectangular-shaped folded dipole (resonating at the ETSI UHF RFID band, 865-868 MHz) and a rhombus-shaped folded dipole (resonating at the WLAN band, 2400-2485 MHz). A few parasitic elements (reflector and directors) are included to focus the field in the required direction, namely out of the worker's hand. A prototype of the proposed textile antenna is developed on a stretchable fabric and its performance is measured in terms of read range and near-field distribution, at 868 MHz, and radiation pattern and gain at 2.45 GHz

Design of a compact yagi-uda antenna for near field UHF RFID smart gloves

A compact Yagi-Uda antenna suitable for near field UHF RFID smart gloves is proposed in this paper. Proposed structure consists of a compact driven element of circular shape and three parasitic elements. Parasitic elements are used as directors to direct the magnetic field in a particular direction. The simulated performance of the proposed antenna is compared in terms of input impedance matching and field distribution with the segmented solenoid antenna already proposed in the scientific literature