High-density microwave encoders for motion control and near-field chipless-RFID
Herrojo, Cristian (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Muela, Francisco Javier (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Mata Contreras, Francisco Javier (Universidad de Málaga. Departamento de Ingeniería de Comunicaciones)
Paredes, Ferran (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Martín, Ferran, (Martín Antolín) (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)

Fecha:	2019
Resumen:	A novel microwave system for measuring linear displacements and velocities with sub-millimeter resolution and for the implementation of near-field chipless radiofrequency identification (chipless-RFID) systems with very high data capacity is presented. The system is based on a reader, consisting of a half-wavelength straight resonator coupled (through capacitor gaps) to a pair of access lines, and a microwave encoder, in relative motion to the reader and consisting of a linear chain of strips orthogonally oriented to the chain axis. By displacing the encoder over the half-wavelength resonator of the reader, with the encoder strips parallel oriented to the reader axis, the relative velocity and position between the encoder and the reader can be inferred. For that purpose, the reader is fed by a harmonic signal tuned to the resonance frequency that results when an encoder strip is perfectly aligned with the reader. The encoder motion amplitude modulates the feeding signal at the output port, and both the position and the velocity are measured from the peaks, or dips, of the resulting envelope function. Moreover, by making certain strips inoperative, the system can be used for coding purposes. Due to the small period of the encoder (0. 6 mm), a high per-unit-length data density in these near-field chipless-RFID tags (i. e. , 16. 66 bits/cm) is achieved. To illustrate the functionality and potential of the approach, 100-bit chipless-RFID tags with various ID codes are implemented and read.
Ayudas:	Ministerio de Economía y Competitividad RTC-2017-6303-7 Ministerio de Economía y Competitividad TEC2016-75650-R Ministerio de Economía y Competitividad BES-2014-068164 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1159
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió acceptada per publicar
Materia:	Displacement sensors ; Velocity sensors ; Chipless-RFID ; Microwave encoders ; Motion control
Publicado en:	IEEE sensors journal, Vol. 19, issue 10 (May 2019) , p. 3673-3682, ISSN 1530-437X

DOI: 10.1109/JSEN.2019.2895015

Postprint 11 p, 684.2 KB

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