Modified Yagi-Uda Reader Antenna for UHF RFID Smart-Glove

This paper introduces a modified Yagi-Uda antenna with the capability of focusing field in a particular direction. The antenna comprises of a rectangular-shaped driven element with one parasitic element. Parasitic element is used as a director to focus the field in a particular direction and increased its strength compared to other directions. The antenna is analyzed in terms of the electric and magnetic field distributions in the near field to the structure. A prototype is developed by using copper tape onto a stretchable fabric to validate the design. A good agreement between measured and simulated results in terms of input impedance matching and field distributions is obtained. The read range of 30 cm in front direction and 19 cm in rear direction is achieved with the transmitted power of 45 mW. The presented antenna is compact in size, it is suitable to be integrated into a UHF RFID Smart Glove