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A novel asterisk-shaped circularly polarized RFID tag for on-metal applications
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2016 (English)In: Applied Computational Electromagnetics Society Journal, ISSN 1054-4887, Vol. 31, no 9, 1035-1042 p.Article in journal (Refereed) Published
Abstract [en]

An asterisk-shaped, metal-mountable RFID tag with a minuscule footprint is presented. The proposed design makes use of multiple asymmetric slots patterned in a cross-shaped fashion to achieve circular polarization. The structure is excited capacitively using a terminally-grounded, T-shaped feed line positioned within the slots. This peculiar arrangement permits the attainment of circular polarized radiation characteristics over a wide band of operation. Impedance matching, antenna size reduction and read range enhancement are the additional advantages offered by the embedded feed line. The final design is realized on a commercially available FR-4 substrate over dimensions of 40 x 40 mm2 yielding an impedance bandwidth and an axial ratio bandwidth of 37 MHz and 20 MHz, respectively. Improvement in antenna gain (and consequently in the read range) is reported upon mounting the tag on metallic surfaces.

Place, publisher, year, edition, pages
Applied Computational Electromagnetics Society (ACES) , 2016. Vol. 31, no 9, 1035-1042 p.
Keyword [en]
Circular polarization, Impedance matching, Radio frequency identification (RFID)., Antenna feeders, Bandwidth, Electric impedance, Impedance matching (electric), Polarization, Antenna gains, Antenna size reductions, Axial ratio bandwidth, Circular polarized, Circularly polarized, FR4 substrates, Impedance bandwidths, Metallic surface, Radio frequency identification (RFID)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-194898ISI: 000383652900004ScopusID: 2-s2.0-84989836543OAI: diva2:1052905

QC 20161207

Available from: 2016-12-07 Created: 2016-11-01 Last updated: 2016-12-27Bibliographically approved

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Tenhunen, Hannu
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ReferencesLink to record
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