the design of rfid conveyor belt gate systems using？an antenna control unitrfid传送带门系统的设计使用天线控制单元.pdf

Sensors 2011, 11, 9033-9044; doi:10.3390/s110909033 OPEN ACCESS sensors ISSN 1424-8220 /journal/sensors Article The Design of RFID Conveyor Belt Gate Systems Using an Antenna Control Unit Chong Ryol Park, Seung Joon Lee and Ki Hwan Eom * Department of Electronic Engineering, Dongguk University, 3-26, Pil-dong, Joong-gu, Seoul, Korea; E-Mails: parkcr@ (C.R.P.); acousticjoon@ (S.J.L.) * Author to whom correspondence should be addressed; E-Mail: kihwanum@; Tel.: +82-2-2260-3332; Fax: +82-2-2279-1798. Received: 21 August 2011; in revised form: 13 September 2011 / Accepted: 20 September 2011 / Published: 21 September 2011 Abstract: This paper proposes an efficient management system utilizing a Radio Frequency Identification (RFID) antenna control unit which is moving along with the path of boxes of materials on the conveyor belt by manipulating a motor. The proposed antenna control unit, which is driven by a motor and is located on top of the gate, has an array structure of two antennas with parallel connection. The array structure helps improve the directivity of antenna beam pattern and the readable RFID distance due to its configuration. In the experiments, as the control unit follows moving materials, the reading time has been improved by almost three-fold compared to an RFID system employing conventional fixed antennas. The proposed system also has a recognition rate of over 99% without additional antennas for detecting the sides of a box of materials.