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Creators/Authors contains: "Guo, Hongzhi"

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  1. Free, publicly-accessible full text available October 1, 2022
  2. Tiny batteryless sensors are desirable since they create negligible impacts on the operation of the system being monitored or the surrounding environment. Wireless energy transfer for batteryless sensors is challenging since they cannot cooperate with the charger due to the lack of energy. In this paper, a Magnetic Blind Beamforming (MagBB) algorithm is developed for wireless energy transfer for batteryless sensors in inhomogeneous media. Batteryless sensors with randomly orientated coils may experience significant orientation losses and they may not receive any energy from the charger. MagBB uses a set of optimized current vectors to generate rotating magnetic fields which canmore »ensure that coils on batteryless sensors with arbitrary orientations can receive sufficient voltages for charging. It does not require any information regarding the batteryless sensor's coil orientation or location. The efficiency of MagBB is proven by extensive numerical simulations.« less
  3. Many important applications in the extreme environment require wireless communications to connect smart devices. Metamaterial-enhanced magnetic induction (M2I) has been proposed as a promising solution thanks to its long communication range in the lossy medium. M$^2$I communication relies on magnetic coupling, which makes it intrinsically full-duplex without self-interference. Moreover, the engineered active metamaterial provides reconfigurability in communication range and interference. In this paper, the new networking paradigm based on the reconfigurable and full-duplex M2I communication technique is investigated. In particular, the theoretical analysis and electromagnetic simulation are first provided to prove the feasibility. Then, a medium access control protocol ismore »proposed to avoid collisions. Finally, the capacity and delay of the full-duplex M2I network are derived to show the advantage of the new networking paradigm. The analysis in this paper indicates that in a full-duplex M2I network, the distance between the source and destination can be arbitrarily long and the end-to-end delay can be as short as a single hop delay. As a result, each node in such network can reach any other node by one hop, which can greatly enhance the network robustness and efficiency. It is important for timely transmission of emergent information or real-time control signals.« less