Direction Estimation Scheme for RFID Tag With an Angled Single Antenna

Recent industries have tried to use Radio Frequency Identification (RFID) to improve their services. The direction estimation scheme for tag movements is the recent interest to track objects with an RFID tag. This paper proposes a new direction estimation scheme of moving tags with an angled single antenna that is inexpensive and general antenna. The idea of the proposed scheme is to focus on asymmetric radio radiation with an angled antenna. The proposed scheme can estimate the direction of a tag movement based on the Received Signal Strength Indicator (RSSI) features and the phase value. The evaluation results showed that the proposed scheme could realize an accurate estimation for tag movements.