The paper addresses the issue of the protection of data-carrying unit of a RFID system during a microwave disinfestations treatment of industrial wood pallets. This process is carried out using microwave reverberation chambers, which represents an efficient alternative to traditional methods, also considering the velocity of the treatment. As required by safety standards, the history of the pallet must be at disposal of the user at any time, and this can be easily accomplished mounting a transponder on the pallet itself to store and retrieve its data by the contactless reader of the RFID system. The protection, against the microwave energy, of the transponder mounted on the pallet can be assured inserting it inside a selective shield that allows its operation at the working frequency. To enhance the efficiency of this selective shielding, the RFID working frequency must be chosen as low as possible. Three different solutions has been investigated in the paper: the use of aluminium thin foils, the use of a conductive elastomer and the use of conductive plastic compounds. The evaluation of these solutions has been carried out considering their loading effects on the transponder coil, their shielding efficiency in the microwave region and the compatibility between the temperature reached during the pallet treatment and the safety of the internal electronic chip. The plastic metallised compound has resulted the most suitable for the presented application.

Selective shielding of RFID systems in presence of very high electromagnetic field levels / DE LEO, Roberto; N., Diaferia; MARIANI PRIMIANI, Valter; Moglie, Franco; G., Nitrati. - (2006), pp. 988-993. (Intervento presentato al convegno EMC Europe 2006 tenutosi a Barcelona, Spain nel 4-8 September 2006).

Selective shielding of RFID systems in presence of very high electromagnetic field levels

DE LEO, Roberto;MARIANI PRIMIANI, Valter;MOGLIE, FRANCO;
2006-01-01

Abstract

The paper addresses the issue of the protection of data-carrying unit of a RFID system during a microwave disinfestations treatment of industrial wood pallets. This process is carried out using microwave reverberation chambers, which represents an efficient alternative to traditional methods, also considering the velocity of the treatment. As required by safety standards, the history of the pallet must be at disposal of the user at any time, and this can be easily accomplished mounting a transponder on the pallet itself to store and retrieve its data by the contactless reader of the RFID system. The protection, against the microwave energy, of the transponder mounted on the pallet can be assured inserting it inside a selective shield that allows its operation at the working frequency. To enhance the efficiency of this selective shielding, the RFID working frequency must be chosen as low as possible. Three different solutions has been investigated in the paper: the use of aluminium thin foils, the use of a conductive elastomer and the use of conductive plastic compounds. The evaluation of these solutions has been carried out considering their loading effects on the transponder coil, their shielding efficiency in the microwave region and the compatibility between the temperature reached during the pallet treatment and the safety of the internal electronic chip. The plastic metallised compound has resulted the most suitable for the presented application.
2006
9788468994383
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/50398
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