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UHF RFID Shelf Reader Antennas for Object Classification and Distance Estimation of Non-Tagged RFID Objects
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.ORCID iD: 0000-0003-2965-0288
2017 (English)In: 2017 Ieee International Conference On Microwaves, Antennas, Communications And Electronic Systems (Comcas), IEEE, 2017, p. 289-292Conference paper, Published paper (Refereed)
Abstract [en]

RFID readers serve the obvious role of extracting information from RFID tagged objects. Objects without RFID tags or objects with tags that for some reason are unreadable will not be noted at all when positioned within an RFID reader antenna's interrogation zone. In this paper, we investigate how UHF RFID reader systems for smart shelf applications could also be used for classification and distance estimation of non RFID tagged objects, if the reader modules provide access to antenna S-parameters. The investigation is performed with an inset fed microstrip antenna where objects of different materials are positioned at different heights above the antenna. It is shown how objects are detected and classified in terms of their materialistic properties through S-parameter analysis and how the distance from the antenna to the object could be estimated.

Place, publisher, year, edition, pages
IEEE, 2017. p. 289-292
Series
IEEE International Conference on Microwaves Communications Antennas and Electronic Systems, ISSN 2150-895X
Keywords [en]
Antennas, RFID, Dielectrics
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-33394ISI: 000426968600065Scopus ID: 2-s2.0-85045838621ISBN: 978-1-5386-3169-0 (electronic)OAI: oai:DiVA.org:miun-33394DiVA, id: diva2:1194479
Conference
IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS), Tel Aviv, ISRAEL, NOV 13-15, 2017
Available from: 2018-04-03 Created: 2018-04-03 Last updated: 2018-10-12Bibliographically approved
In thesis
1. Flexible Circuits and Materials for Creating Large-Area RFID Reader Antenna Systems
Open this publication in new window or tab >>Flexible Circuits and Materials for Creating Large-Area RFID Reader Antenna Systems
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

One of the applications for RFID technology is to monitor and position RFID-tagged objects over large volumes. To achieve this, one possible option is to implement RFID reader antennas, which are relatively thin but with significantly large areas, and place them beneath the RFID-tagged objects.  In order to realise RFID reader antennas with large-areas, circuit materials other than conventional rigid PCB materials should be investigated and utilized. Therefore, this thesis addresses how non-conventional PCB materials can be used to achieve large-area RFID reader antenna structures.

   Non-conventional PCB materials are firstly chosen, which comprises patterned Al-polyimide foil, printed conductive Ag inks onto paper, polyethylene foam as antenna substrate. The physical and electrical properties of the materials are measured. These properties are later used in antenna simulations. In addition, assembly methods, e.g. circuit lamination and VIA fabrication, for the chosen materials are developed. 

   Three novel surface mounting techniques are developed and characterized in this thesis. The techniques are developed for mounting SMD components onto tracks made by Al, a screen printed Ag flake ink, and an inkjet printed Ag nanoparticle ink. These techniques are characterized and evaluated by various methods, including contact resistance measurements, bonding strength tests, and microscopy studies. The characterizations show these techniques have achieved low contact resistance and sufficient bonding strength.

   Based on the previous efforts, two antenna systems, respectively operating on UHF (867 MHz) and HF (13.56 MHz) bands, are fabricated. The two antenna systems are designed into SP4T switching networks, using standard antenna elements as the loads of the network. The input RFID interrogation signals from commercial industrial RFID readers are directed into every antenna element periodically through the SP4T switching networks. Both antenna systems are characterized by means of various RF power attenuation measurements and passive RFID tag interrogation tests. It is shown in the results that both antenna systems have low RF attenuations, potentials to perform passive RFID tag positioning, and possibilities to be expanded to larger areas.

   In the end, based on the antenna system characterization results and design parameters, a great amount of calculation is performed in order to discuss how large the antenna system areas can be as well as how many antenna elements can be achieved in one antenna system. 

Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2018. p. 67
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 148
National Category
Communication Systems Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:miun:diva-34698 (URN)978-91-88527-79-0 (ISBN)
Presentation
2018-11-15, O102s, Holmgatan 10, Sundsvall, 10:00 (English)
Opponent
Supervisors
Available from: 2018-10-12 Created: 2018-10-12 Last updated: 2018-10-12Bibliographically approved

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Li, XiaotianSidén, JohanAndersson, Henrik

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