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Open AccessFeature PaperArticle

Low-Frequency RFID Signal and Power Transfer Circuitry for Capacitive and Resistive Mixed Sensor Array

1
Department of Information Engineering, University of Brescia, Via Branze 38, 25123 Brescia, Italy
2
INO-CNR (National Institute of Optics—National Research Council), Via Branze 45, 25123 Brescia, Italy
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(6), 675; https://doi.org/10.3390/electronics8060675
Received: 14 May 2019 / Revised: 3 June 2019 / Accepted: 11 June 2019 / Published: 14 June 2019
(This article belongs to the Section Microwave and Wireless Communications)
This paper presents a contactless measurement system for a mixed array of resistive and capacitive sensors exploiting a low-frequency radio-frequency identification (RFID)-based approach. The system is composed of a reader unit which provides power to and exchanges measurement data with a battery-less sensor unit. The sensor unit is based on a transponder operating at 134.2 kHz and a microcontroller. The microcontroller sequentially measures the elements of the sensor array composed of n capacitive and m resistive sensors which share a common terminal. The adopted technique measures the charging time of a resistor–capacitor (RC) circuit, where the resistor or the capacitor can be either the sensing element or a reference component. With the proposed approach, the measured values of the resistive or capacitive elements of the sensor array are first-order independent from the supply voltage level. A prototype has been developed and experimentally tested with resistive elements in the range 400 kΩ–1.2 MΩ and capacitive elements in the range 200 pF–1.2 nF showing measurement resolution values of 1 kΩ and 5 pF, respectively. Operative distances up to 3 cm have been achieved, with readings taken faster than one element of the array per second. View Full-Text
Keywords: low-frequency RFID; capacitive and resistive sensors; contactless interrogation; power transfer low-frequency RFID; capacitive and resistive sensors; contactless interrogation; power transfer
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MDPI and ACS Style

Demori, M.; Baù, M.; Dalola, S.; Ferrari, M.; Ferrari, V. Low-Frequency RFID Signal and Power Transfer Circuitry for Capacitive and Resistive Mixed Sensor Array. Electronics 2019, 8, 675. https://doi.org/10.3390/electronics8060675

AMA Style

Demori M, Baù M, Dalola S, Ferrari M, Ferrari V. Low-Frequency RFID Signal and Power Transfer Circuitry for Capacitive and Resistive Mixed Sensor Array. Electronics. 2019; 8(6):675. https://doi.org/10.3390/electronics8060675

Chicago/Turabian Style

Demori, Marco; Baù, Marco; Dalola, Simone; Ferrari, Marco; Ferrari, Vittorio. 2019. "Low-Frequency RFID Signal and Power Transfer Circuitry for Capacitive and Resistive Mixed Sensor Array" Electronics 8, no. 6: 675. https://doi.org/10.3390/electronics8060675

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