Passive UHF RFID Tag for Wireless Detection of Compression of Materials
Qureshi, Shoaib Tahir (2018)
2018
Electrical Engineering
Tieto- ja sähkötekniikan tiedekunta - Faculty of Computing and Electrical Engineering
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Hyväksymispäivämäärä
2018-10-03
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201808212183
https://urn.fi/URN:NBN:fi:tty-201808212183
Tiivistelmä
Starting from assets tracking, inventory control and identification applications, RFID systems are becoming a backbone for wireless sensor networks (WSNs). Due to their small size, low cost and low maintenance, they are very suitable choice for future advancements in Internet of Things (IoT) technology. Passive wireless sensors have an advantage over active sensors as they don’t require any external power source for their operation as active sensors require a battery or any other source to operate. The demand of RFID passive sensors is increasing as new research areas are opening whether it is a wearable technology application, or it is related to health monitoring.
In this research work, RFID pressure sensing application has taken into consideration. Two different types of antennas were used for testing purpose in order to get a suitable one out of it. Two-part dipole antenna and SRR antenna were selected as some of the previous work is been done on these antennas. Two-part antenna concept for both, the dipole and SRR used here is to analyze the sensor response when it is subjected to different compression levels. Performance of both antennas were analyzed in order to see which of the antenna’s read range is increasing when compression level is increased.
With SRR, there was an increase in read range of the tag as compression was done, compared with a two-part dipole antenna which behaved in a random manner. We got successful results from SRR, but the two-part antenna didn’t work the same way. Similarly, the backscattering was also observed on SRR to further improve the results and analysis. We named our tag with SRR antenna a ‘Sensor Tag’. In terms of backscattering power, sensor tag was taking a less amount of power to turn it on compared with a state when the sensor was uncompressed.
Performance of a sensor tag was also evaluated when a reference tag was inserted in anechoic chamber with a sensor tag. Reference tag showed higher read range with almost a same behavior in all of the states when the sensor was compressed. Similarly, backscattering measurements were also performed to conclude that SRR when used as a sensor tag in compression state behaves well compared with a two-part dipole antenna.
In this research work, RFID pressure sensing application has taken into consideration. Two different types of antennas were used for testing purpose in order to get a suitable one out of it. Two-part dipole antenna and SRR antenna were selected as some of the previous work is been done on these antennas. Two-part antenna concept for both, the dipole and SRR used here is to analyze the sensor response when it is subjected to different compression levels. Performance of both antennas were analyzed in order to see which of the antenna’s read range is increasing when compression level is increased.
With SRR, there was an increase in read range of the tag as compression was done, compared with a two-part dipole antenna which behaved in a random manner. We got successful results from SRR, but the two-part antenna didn’t work the same way. Similarly, the backscattering was also observed on SRR to further improve the results and analysis. We named our tag with SRR antenna a ‘Sensor Tag’. In terms of backscattering power, sensor tag was taking a less amount of power to turn it on compared with a state when the sensor was uncompressed.
Performance of a sensor tag was also evaluated when a reference tag was inserted in anechoic chamber with a sensor tag. Reference tag showed higher read range with almost a same behavior in all of the states when the sensor was compressed. Similarly, backscattering measurements were also performed to conclude that SRR when used as a sensor tag in compression state behaves well compared with a two-part dipole antenna.