Synchronous Electromagnetic Encoders Based on Step-Impedance Resonators
Karami-Horestani, Amirhossein (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Paredes, Ferran (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Martín, Ferran (Martín Antolín) (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)

Date:	2023
Abstract:	This article presents a new type of electromagnetic encoders based on step-impedance resonators (SIRs). The encoders consist of a linear chain of transversely oriented SIRs etched on a dielectric substrate, whereas the reader is a simple microstrip transmission line fed by a certain number of single-tone signals, i. e. , three in one prototype, and four in another prototype, tuned to specific predefined frequencies. System functionality is based on detecting at which of such predefined frequencies (considering all possible combinations), each SIR of the chain resonates. Thus, the number of combinations (or states) per encoder position (or row) corresponding to the prototype fed with three single-tone signals is seven, whereas it is 15 for the prototype fed with four single-tone signals, corresponding to 2. 81 and 3. 91 bits, respectively, per encoder row. Although there are other synchronous electromagnetic encoders exhibiting a higher number of bits per row, the number of chains of those encoders is at least two, and the readers are complex microwave structures based on power splitters, contrary to the prototypes reported in this article. Enhancing the number of bits per row in these encoders is a fundamental aspect toward the implementation of true absolute electromagnetic encoders able to determine the position relative to the reader at any instant of time without the need to know the previous stages of encoder motion (a need in the incremental type and in the so-called quasi-absolute encoders).
Grants:	Agencia Estatal de Investigación PID2019-103904RB-I00 Agencia Estatal de Investigación PDC2021-121085-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00192 Agencia Estatal de Investigación PRE2020-093239
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Electromagnetic encoder ; Displacement sensor ; Microstrip technology ; Microwave sensor ; Stepimpedance resonator (SIR)
Published in:	IEEE sensors journal, Vol. 23, Issue 19 (October 2023) , p. 22440-22450, ISSN 1530-437X

DOI: 10.1109/JSEN.2023.3301095

Available from: 2024-10-31 Postprint

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Engineering > CIMITEC-UAB
Articles > Research articles
Articles > Published articles