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In this work, a passive UHF RFID platform for sensing applications is presented. The platform consists of a passive UHF RFID tag and a base station. The tag has an inductively-fed, meandered dipole antenna that is impedance matched to a CMOS IC that contains the remote powering, power management, and communication circuits to operate with sensor interfaces. The power management includes an LDO voltage...
In this work, a passive UHF RFID system for capacitive sensor applications is presented. The design of the base station and the passive RFID tag is explained. The tag consists of an inductively-fed, meandered dipole antenna and an IC that contains the remote powering, communication, and sensor interface circuitry. The rectifier in the tag is a highly efficient differential rectifier with self threshold...
In this work, a base-station design is proposed for passive UHF RFID tags that use pulse-width modulation (PWM) in backscattering communication. The theoretical analysis of the PWM backscattering is presented along with the challenges it creates in the base-station design. The self-jamming issue in the base station is analyzed with a numerical case study. The theoretical analysis of the reverse communication...
This work discusses the remote powering link of a passive UHF RFID tag for sensor applications. The design, implementation, and measurements of the base-station antenna, tag antenna, and the rectifier are presented. The base-station antenna is a 50 Ω rectangular patch antenna with a measured far-field gain of 3.6 dBi. The tag antenna is an inductively coupled meandered dipole antenna impedance matched...
In this work, the design of a passive UHF RFID tag for sensor applications is described. The system level design issues are discussed taking into account the possible operation scenarios. Among the blocks in the tag, the emphasis is on the design of the rectifier and the capacitive sensor interface. The three-stage, differential-input rectifier is designed to generate the supply voltage with input...
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