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Sub-THz Luneburg lens enabled wide-angle frequency-coded identification tag for passive indoor self-localization

Published online by Cambridge University Press:  13 May 2022

Petr Kadera Open the ORCID record for Petr Kadera [Opens in a new window] ,
Jesús Sánchez-Pastor Open the ORCID record for Jesús Sánchez-Pastor [Opens in a new window] ,
Lisa Schmitt Open the ORCID record for Lisa Schmitt [Opens in a new window] ,
Martin Schüßler ,
Rolf Jakoby Open the ORCID record for Rolf Jakoby [Opens in a new window] ,
Martin Hoffmann Open the ORCID record for Martin Hoffmann [Opens in a new window] ,
Alejandro Jiménez-Sáez Open the ORCID record for Alejandro Jiménez-Sáez [Opens in a new window]  and
Jaroslav Lacik Open the ORCID record for Jaroslav Lacik [Opens in a new window]
Petr Kadera*
Affiliation:
Department of Radio Electronics, Brno University of Technology, Technicka 12, Brno, Czech Republic
Jesús Sánchez-Pastor*
Affiliation:
Institute of Microwave Engineering and Photonics, Technische Universität Darmstadt, Merckstraße 25, Darmstadt, Germany
Lisa Schmitt
Affiliation:
Chair for Microsystems Technology, Ruhr-Universität Bochum, Universitätsstraße 150, Bochum, Germany
Martin Schüßler
Affiliation:
Institute of Microwave Engineering and Photonics, Technische Universität Darmstadt, Merckstraße 25, Darmstadt, Germany
Rolf Jakoby
Affiliation:
Institute of Microwave Engineering and Photonics, Technische Universität Darmstadt, Merckstraße 25, Darmstadt, Germany
Martin Hoffmann
Affiliation:
Chair for Microsystems Technology, Ruhr-Universität Bochum, Universitätsstraße 150, Bochum, Germany
Alejandro Jiménez-Sáez
Affiliation:
Institute of Microwave Engineering and Photonics, Technische Universität Darmstadt, Merckstraße 25, Darmstadt, Germany
Jaroslav Lacik
Affiliation:
Department of Radio Electronics, Brno University of Technology, Technicka 12, Brno, Czech Republic
*
Author for correspondence: P. Kadera, E-mail: kadera@vutbr.cz; J. Sánchez-Pastor, E-mail: jesus.sanchez@tu-darmstadt.de
Author for correspondence: P. Kadera, E-mail: kadera@vutbr.cz; J. Sánchez-Pastor, E-mail: jesus.sanchez@tu-darmstadt.de
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Abstract

An earlier version of this paper was presented at the 2021 15th European Conference on Antennas and Propagation (EuCAP) and was published in its Proceedings. This paper describes a design, fabrication, and characterization of a planar frequency-coded retroreflector for indoor localization. The retroreflector is fabricated in high-resistive silicon and consists of a Luneburg lens antenna and a photonic crystal high-Q resonator reflective layer, providing ranging and identification within the same tag and bandwidth. The Luneburg lens antenna presents a measured gain of 21.63 dBi at a design frequency of 240 GHz. The frequency-coded retroreflector allows for ranging in a continuous 130 degree angular range in azimuthal plane, with a discrete but repeatable two-resonance identification over multiples of 15 degree. Its maximum measured radar cross-section is −23.48 dBsqm at a frequency of 240 GHz. The retroreflective tag set in ideal line-of-sight situation is compared to a non-line-of-sight arrangement showing the influence of a metallic rod as an obstacle on the overall tag detection parameters. Finally, the successful read-out of the retroreflective tag is discussed in unknown environments, where no a-priori information is available.

Keywords

Chipless RFIDhigh-Q resonatorslens antennaphotonic crystalretroreflector
Type
EuCAP 2021 Special Issue
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Special Issue 1: EuCAP 2021 Special Issue , February 2023 , pp. 59 - 73
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press in association with the European Microwave Association

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Footnotes

*

Petr Kadera and Jesús Sánchez-Pastor contributed equally to this work.

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