A Pattern Reconfigurable Yagi Uda Antenna Controlled by UHF RFID Technology

The study introduces a novel application of Radio Frequency Identification (RFID) technology in smart antenna systems, specifically targeting the wireless control of a Yagi-Uda antenna's radiation pattern using Ultra High Frequency (UHF) RFID technology. By leveraging RFID, the system remotely adjusts the length of the passive resonator, enabling it to act as either a director or a reflector. This innovative approach addresses the limitations of wire-based control seen in traditional pattern-configurable antennas, ensuring stable antenna patterns while minimizing costs and energy consumption. At 2.4 GHz, the proposed Yagi antenna achieves directional operation with a gain of approximately 5.6 dBi and an impressive front-to-back ratio of 10.6 dB. Additionally, the system demonstrates high energy efficiency, consuming only 12 µW of power.