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In this work, a fast method for vector modulation based active leakage cancellation is proposed for UHF RFID readers. The search space is narrowed by an initial phase and amplitude comparison between the reference signal and the leakage signal. The proposed method achieves up to 32% reduction in the number of search steps with up to 60 dB suppression in the leaked signal power. Moreover, the settling...
This paper presents techniques for increasing communication data rates for OOK modulated signals in the case the carrier frequency is generated by a cross-coupled pair LC oscillator. The proposed circuitry completely turns off the transmitter during the transmission of “0” bit and oscillation occurs only when the data bit is “1” to reduce power consumption. The data bit controls the steady state bias...
The wireless body area network (WBAN) includes up to ten sensor nodes and an external control unit to synchronize the wireless power transfer and communication. A battery operated sensor node is designed using discrete components and tested on standard FR4 substrate. The board dimensions are 2.7 × 4.9 cm2 which fits inside the Kinetra neurostimulator casing provided by Medtronic, wherein a six elements...
The design of a wearable antenna for UHF band at 900 MHz with an integrated front-end for a wireless sensor system targeting remote patient monitoring is presented. A wearable antenna for human body with −7.2 dB gain is demonstrated using five layer torso model. The antenna can deliver 25 μW of power to the rectifier at 4.6 meters distance from the base station emitting PEIRP=4 W. Local power management...
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