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Printed electromagnetic coupler with an embedded moisture sensor for ordinary passive RFID tags
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.ORCID-id: 0000-0002-3790-0729
2011 (engelsk)Inngår i: IEEE Electron Device Letters, ISSN 0741-3106, E-ISSN 1558-0563, Vol. 32, nr 12, s. 1767-1769Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

This letter presents a printed UHF RFID sensor solution that indicates if a passive RFID tag has been exposed to a certain degree of moisture. The printed sensor operates as a write-once-read-many (WORM) resistive memory device as it permanently changes its resistance from about 10 to 10 after exposure to moisture or water. A printed coupling loop with an embedded WORM sensor is horizontally placed just above the surface of an ordinary UHF RFID tag. Electromagnetic coupling is used to modulate the properties of the tag antenna by changing its input impedance and introducing ohmic losses in proportion to the embedded sensor values. The passive RFID tag can change state from readable to unreadable when the WORM bit is set, i.e., is put in a low-resistance state. The proposed concept verifies that commercial RFID tags can be used as sensor tags by simply adding an electromagnetically coupled sensor as a sticker or by similar means, without the need for ohmic contacts between the sensor and the original RFID tag. © 2006 IEEE.

sted, utgiver, år, opplag, sider
2011. Vol. 32, nr 12, s. 1767-1769
Emneord [en]
Antennas, Electromagnetic coupling, Humidity sensors, Printed electronics, RFID
HSV kategori
Identifikatorer
URN: urn:nbn:se:miun:diva-15301DOI: 10.1109/LED.2011.2170616ISI: 000297352500040Scopus ID: 2-s2.0-81855183763Lokal ID: STCOAI: oai:DiVA.org:miun-15301DiVA, id: diva2:466379
Forskningsfinansiär
EU, European Research Council, no. 215132Tilgjengelig fra: 2011-12-15 Laget: 2011-12-15 Sist oppdatert: 2017-12-08bibliografisk kontrollert
Inngår i avhandling
1. Antenna-based passive UHF RFID sensor tags: Design and application
Åpne denne publikasjonen i ny fane eller vindu >>Antenna-based passive UHF RFID sensor tags: Design and application
2013 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

RFID, as a low cost technology with a long life time, provides great potential for transmitting sensor data in combination with the ordinary ID number. The sensor can, for example, be integrated either in the chip or in the antenna of an RFID tag.This thesis focuses on the design of antenna-based UHF RFID sensor tags as wireless sensors at the lowest possible cost level compatible with standard communication systems in logistics. The applications of the sensor tags, in this work, mainly target remote humidity sensing. Antenna-based sensory UHF RFID tags utilize the influence that the physical or chemical parameters to be sensed have on the electrical properties of a tag antenna. The variations of the electrical properties of the tag antenna can be measured in many ways. In the thesis, a description is provided as to how these variations are normally measured by an RFID reader without any other assistant equipment. Three structures of antenna-based RFID sensor tags are presented with detailed characterizations. The first one utilizes the sensitivity of the antenna to the surrounding environment to construct RFID sensor tags, where a moisture absorbing layer providing wetness/humidity sensor functionality is placed on the RFID tag antenna to increase the humidity concentration surrounding the tag antenna and the thesis describes how to overcome certain limitations due to disturbances associated with background materials. The second structure directly integrates a small resistive sensor element into an RFID tag antenna and the sensor information can thus modulate the antenna performance by means of galvanic contact. The third structure embeds a small resistive sensor element into a loop which is positioned on top of the tag antenna and the sensor information can thus modulate the performance of the tag antenna by means of electromagnetic coupling. Both theoretical analysis and fullwave simulations are presented for the latter two sensor tag structures in order to characterize the performance of the sensor tags. An ultra-low cost printed humidity sensor with memory functionality is also designed and thoroughly characterized for integration into RFID tag antennas by means of galvanic contact or electromagnetic coupling. The sensor is a 1-bit write-once-read-many (WORM) memory printed using conductive ink. The WORM works as a pure resistive humidity sensor and can provide information about an historical event. The WORM sensor is presented by introducing its geometry, characterizingits behavior in humidity and explaining the principle of the humidity effect. The WORM sensors are also integrated into the RFID tags by means of both galvanic contact and electromagnetic coupling in order to experimentally verify the two concepts. To lower the cost of the RFID tags, the antennas are normally printed, milledor etched on flexible substrates using low-cost high-speed manufacturing methods which in some cases cause a high degree of edge roughness. The edge roughness will affect the behavior of the antenna, however, the characteristics of edge roughness on RFID antennas have previously not received any significant attention. Unforeseen antenna behavior can affect the antenna-based sensor tags, thus the influence of edge roughness is also investigated in the thesis.

sted, utgiver, år, opplag, sider
Sundsvall: Mid Sweden University, 2013. s. 84
Serie
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 157
HSV kategori
Identifikatorer
urn:nbn:se:miun:diva-19889 (URN)STC (Lokal ID)978-91-87103-99-5 (ISBN)STC (Arkivnummer)STC (OAI)
Disputas
2013-06-18, Sundsvall, 13:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2013-09-19 Laget: 2013-09-19 Sist oppdatert: 2016-10-19bibliografisk kontrollert

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