Design of an integrated dual-frequency passive RFID sensor tag
To eliminate the limitations of ultra-high frequency(UHF)and high frequency(HF)radio frequency identifi-cation(RFID)sensors due to their measuring distances and ease of use for different application scenarios,a design for du-al-frequency passive RFID sensor tags integrating UHF and HF is proposed.Firstly,UHF and HF RFID transceivers for radio frequency power supply and data transceiver modules are integrate to achieve the purpose of UHF and HF dual fre-quency reading and writing.Secondly,in order to increase the reading distance of dual-frequency RFID sensor tags in UHF mode,a charge pump is used to boost the output voltage of the radio frequency transceiver chip to extend the dis-charge time.Then,to enhance the versatility of the sensor tag,the measurement data is integrated into the HF NDEF message and the UHF user data segment.According to the above method,a dual-frequency passive RFID temperature and humidity sensor tag is designed.At the same time,an experimental platform was built to verify the feasibility of the charge pump to increase the reading distance and the function of the sensor tag.The experimental results show that the sensor tag can support both UHF and HF reading modes.The use of charge pump boost energy management effectively improves the reading distance.The sensor tag can be used with a universal UHF reader that supports the EPC C1G2 pro-tocol and NFC mobile phone to easily obtain the sensor data.
RFID sensorradio frequency energy harvestingpower managementcharge pumpNDEF
NETL
NSTL
万方数据
