Abstract
For some scenarios of vehicle tracking and identification, it is desired that radio-frequency identification (RFID) interrogators can be deployed on roadside lampposts or high poles. In order to meet this requirement, active RFID electronic license plate (e-plate) with a slot-dipole antenna is proposed to provide up-tilted beams. Numerical simulations demonstrate that the proposed e-plate antenna has desired impedance bandwidth, high gain and multi-beam radiation pattern as required at 2.45 GHz RFID band. In addition, the estimated read range of the proposed e-plate meets the requirement of RFID system, and deployment of interrogator on roadside lamppost or high pole is analyzed.
Highlights
In recent years, radio-frequency identification (RFID)-based e-plate has received much attention for the use in vehicle identification
An antenna, an application specific integrated circuit (ASIC) and battery are included in an active RFID tag embedded in the e-plate
Based on the RFID requirement, there should be an operation bandwidth ranging from 2.4 GHz to 2.483 GHz [7]
Summary
RFID-based e-plate has received much attention for the use in vehicle identification. Most license plates are made of metallic materials, so that the antennas behind e-plate will not work properly. To solve this problem, slot-type antenna is a good choice, and has been successfully designed for metallic object [4, 5]. In [6], an active e-plate has been reported by making use of meander slot to avoid damaging the layout of characters and numbers on the license plate, which limits the position and shape of the slot to a certain extent. The slot-dipole antenna takes a very simple structure, and it makes RFID tag module be integrated into the proposed e-plate.
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