Abstract
To detect multiple identifications (IDs) for cm -level high-precision positioning item-level tagging (ILT) systems in near-field ultra-high-frequency RFID applications, an electric-field-coupled multiple ID sensor is presented. The proposed ID sensor consists of four circular electric coupling parts, an impedance-matching network, and an SP4T switch for position control. By switching the electric-field-coupled sensing parts, cm -level position detection of densely aggregated RFID tags for a small-sized ILT can be achieved. The sensing distance of the proposed ID sensor is ~7 mm and its physical size is 50 × 50 mm 2 (~1/7 λ 0 at 920 MHz).
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