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Modified EAS Tag Used as a Resistive Sensor Platform

Electronics Design Division, Department of Information Technology and Media, Mid-Sweden University, SE-851 70, Sundsvall, Sweden
Digital Printing Center, Department of Applied Science and Design, SE-891 18, Örnsköldsvik, Sweden
Author to whom correspondence should be addressed.
Electronics 2012, 1(2), 32-46;
Received: 6 September 2012 / Revised: 30 October 2012 / Accepted: 30 October 2012 / Published: 9 November 2012
(This article belongs to the Special Issue Feature Papers)
PDF [2241 KB, uploaded 9 November 2012]


In this article, a modified design of an RF Radio Frequency Electronic Article Surveillance (EAS) tag, used as a sensor platform, is manufactured and characterized. EAS tags are passive devices consisting of a capacitor and coil, tuned to a resonance frequency readable by the detector equipment, in this case 8.2 MHz. They were originally used to detect whether merchandise was being moved through the detection gates at shop exits, in which case an alarm was triggered. If the capacitance is divided in two and a resistive sensor device inserted in between, the resonant Inductor-Capacitor (LC) circuit becomes an Inductor-Capacitor-Capacitor-Resistor LCCR circuit and can be used as a sensor tag. A high sensor resistance means that one capacitor is decoupled, leading to one resonance frequency, while a low resistance will couple both capacitances into the circuit, resulting in a lower resonance frequency. Different types of resistive sensors exist that are able to detect properties such as pressure, moisture, light and temperature. The tag is manufactured in Aluminum foil on a polyetylentereftalat (PET) substrate, resulting in a cost effective RF-platform for various resistive sensors. Two types of tags are designed and manufactured, one with parallel plate capacitors and the other with interdigital capacitors. To test the tags, a resistive tilt sensor is mounted and the tags are characterized using a network analyzer. It is shown that for high resistance, the tags have a resonance frequency of morethan 10 MHz while for low values the frequency approaches 8.2 MHz. View Full-Text
Keywords: resonance circuit; RF-tag; EAS; surveillance resonance circuit; RF-tag; EAS; surveillance

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Andersson, H.; Hammarling, K.; Sidén, J.; Manuilskiy, A.; Öhlund, T.; Nilsson, H.-E. Modified EAS Tag Used as a Resistive Sensor Platform. Electronics 2012, 1, 32-46.

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