Flexible UHF RFID Tag Gain Enhancement using Metamaterial Structure

Araujo, Jessyca Iasmyn Lucena; Morais, Samuel Medeiros Araujo; Serres, Alexandre; Albuquerque, Camila Caroline Rodrigues de; Serres, Georgina Karla de Freitas; Santos, Danilo F. S.; Silva, Carolina Cavalcanti Pedrosa e; Oliveira, Alexandre M. de

doi:10.1109/inscit.2019.8868821

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…The RFID tag consists of an improvement of that presented in [8], with alteration of the L3 dimension of the port to facilitate the soldering of the chip and adjustments in other dimensions in order to achieve a resonance frequency close to 915 MHz with a lower value of the coefficient of reflection (S 11). Its simulation was also carried out using the ANSYS® Electronics Desktop TM software.…”

Section: Simulationsmentioning

confidence: 99%

“…In this work, the RFID UHF system that was developed for monitoring the respiratory rate is presented, and it is possible to determine the value of this frequency from the variation data of the Received Signal Strength Indicator (RSSI). Section 2 presents the tag design with the simulation results obtained after optimization of the tag presented in [8], as well as the made tag. In Section 3, the measurement settings are described, the respiratory signals obtained from reading the tags, that is, the RSSI variation signals due to respiratory movements, as well as the respiratory frequency results obtained from these variations of the RSSI and with the vital signals monitor.…”

Section: Introductionmentioning

confidence: 99%

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RFID System for Respiratory Rate Monitoring

2022

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In this work, an RFID system was developed to monitor the respiratory rate. This monitoring was based on variations in the Received Signal Strength Indicator (RSSI) by the reader due to respiratory movements. In some breath measurement configurations, the maximum read range was greater than 1 m, which is the distance considered in the measurement configurations described in some scientific papers. The RSSI data, obtained by reading the RFID tag, were processed using the Daubechies wavelet of order 3 (db3) and considering three levels of signal decomposition. Less noisy breathing signals were obtained in the measurements with the participant seated and the RFID tag with the polyethylene foam on the abdomen. The respiratory frequencies acquired from the variations of the RSSI parameter were validated by comparison with the results obtained using a vital signals monitor.

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Section: Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

RFID System for Respiratory Rate Monitoring

2022

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“…1. In [7], metamaterial structure is proposed with improvement in directivity and gain of the tag. Absorption and frequency are controlled by parameters of the resonator and thickness of the substrate [8].…”

Section: Introductionmentioning

confidence: 99%

Chipless RFID tag based on metamaterial absorbers

Vaz¹,

Barros²,

Silva³

et al. 2022

Anais Do XL Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

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A metamaterial absorber (MA) used as RFID tag is proposed in this paper. Absorbers lead to small tags with absorption peaks as characteristic signatures. The designed structure is a metasurface with metallic frequency selective surfaces over a grounded dielectric slab. CST simulations have absorption peaks of 99.25% at 3.5 GHz and 99.4% at 5.9 GHz. Absorber unit cell on FR-4 is a square of dimensions of 0.201 times the wavelength at the low resonant frequency. Simulated radar cross section presents adequate beamwidth for the designed frequency bands.

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