Table 6.

Principal RFID sensors manufacturers. The websites have been accessed on 1 March 2021.

Company Name	Website	Sensor
AMS	https://ams.com/wireless-sensor-tags-interfaces	Temperature/integration with external sensors
Axzon (RFmicron)	https://axzon.com/sensors/	Temperature, moisture
Farsens	http://www.farsens.com/en/products/battery-free-rfid-sensors/	Temperature, humidity, force/strain, Pressure, LED/RF field detection, Switch/relay monitoring, orientation, light, magnetic field
Infratab	https://www.infratab.com/rf-sensor-solutions	food freshness
Melexis	https://www.melexis.com/en/products/communicate/nfc-rfid-products	Temperature/integration with external sensors
NXP	https://www.nxp.com/products/rfid-nfc/nfc-hf/ntag/ntag-smartsensor:NTAG-SMART-SENSOR	Temperature
ON Semiconductor	https://www.onsemi.com/products/sensors/battery-free-wireless-sensor-tags	Temperature, moisture
Phase IV	https://www.phaseivengr.com/products/rfid-sensors/	Temperature, moisture, pressure, strain
PowerCast	https://www.powercastco.com/products/rfid-sensor-tags/	Temperature, humidity, light
RadioForce	https://www.radioforce.net/en/products/sensors	Temperature, humidity, water detection, Motion, vibrations, pressure
Silent Sensors	https://www.silentsensors.com/	Tire conditions
Smartrac	https://www.smartrac-group.com/sensor-inlays-and-tags.html	Temperature, moisture
Texas Instruments	https://www.ti.com/wireless-connectivity/other-wireless-technologies/overview/nfc-rfid.html	Temperature + SPI/I2C external sensor
PST Sensors	https://www.pstsensors.com/wireless.htm	Temperature