Elimination of Blind Spots in Tag Readable Areas for UHF RFID In/Outlet Management System

An optimization method for UHF RFID tag readable areas for an inlet/outlet management system is presented in this paper. The optimization of the readable area is done by varying the RFID reader's transmission power and the tilt angles of two antennas installed above a doorway which illuminate the areas in front and at the back of the door. With this optimization method, readable areas without signal blind spots due to multipath fading can be achieved. This optimization strategy can be applied to define desirable RFID tag readable areas in different working environments.