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Wireless Power Transfer via Strongly Coupled Magnetic Resonances
Science, 2007Using self-resonant coils in a strongly coupled regime, we experimentally demonstrated efficient nonradiative power transfer over distances up to 8 times the radius of the coils. We were able to transfer 60 watts with ∼40% efficiency over distances in excess of 2 meters.
André, Kurs +5 more
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Journal of Magnetic Resonance, 2009
Inductively coupled radiofrequency resonators can provide NMR signals from small samples wirelessly and with high sensitivity. We explore the achievable sensitivity depending on the resonator's Q-factor and its cross-inductance to the NMR probe. Even for small resonators with modest Q, the sensitivity can be close to that of directly (impedance ...
Utz, Marcel, Monazami, Reza
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Inductively coupled radiofrequency resonators can provide NMR signals from small samples wirelessly and with high sensitivity. We explore the achievable sensitivity depending on the resonator's Q-factor and its cross-inductance to the NMR probe. Even for small resonators with modest Q, the sensitivity can be close to that of directly (impedance ...
Utz, Marcel, Monazami, Reza
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Strongly coupled resonance magnetic for RFID applications
2013 IEEE Antennas and Propagation Society International Symposium (APSURSI), 2013Wireless power and data transfer (WPDT) through the strongly coupled magnetic resonance (SCMR) method at an RFID frequency is reported. The proposed system consists of four single resonant loops, in contrast to the two resonant loops traditionally used in RFID.
Olutola Jonah +2 more
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Magnetically coupled resonators for rate integrating gyroscopes
IEEE SENSORS 2014 Proceedings, 2014This work demonstrates for the first time the use of magnetic field to couple mechanical resonators that can be separated by long distances (8mm in this work) compared to coulombic/electrostatic coupling (~ 1 nm – 1 μm depending on the surface charge density or E-field).
Pradeep Pai +2 more
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Parametric resonance of a magnetically coupled harvester
Active and Passive Smart Structures and Integrated Systems XII, 2018Parametric excitation has been investigated for several years as an effective way to drive a structure parametrically into large distinctive responses. However, parametric resonance requires a minimum threshold of excitation to be triggered. To reduce the threshold, we propose a two-degree-of-freedom vibration system.
Shahrzad Towfighian, Wei Yang
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Double Magnetic Resonance of Coupled Spins
Journal of Applied Physics, 1967A perturbation procedure is introduced to solve for the probability amplitudes of a system of coupled spins under the action of two rf magnetic fields; one a large saturating signal, the other a relatively weak one. The power absorbed when the saturating signal connects two states in the system is affected by the presence of the second signal ...
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Wireless charging technology using magnetically coupled resonators
2011 IEEE 33rd International Telecommunications Energy Conference (INTELEC), 2011We are successful to charge the iPod touch using magnetically coupled resonators. The wireless charging was possible within the distance variation within 10 cm. The signal was generated and amplified with the balanced power amplifier structure which is useful for isolating the reflected power near the operation frequency of 9.4 MHz.
Yong-Hae Kim +4 more
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Magnetic resonance lineshapes in exchange coupled paramagnets
Physics Letters A, 1969Abstract Systematic discrepancies between predicted and observed exchange narrowed EPR and NMR resonance linewidths in MnF 2 , KMnF 3 , RbMnF 3 are examined. A model lineshape based upon the 2nd, 4th and 6th moments is proposed which improves agreement with experiment.
J.E. Gulley +2 more
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Magnetic Resonance Coupling Phenomenon and Basic Characteristics
2020The purpose of this chapter is to examine the characteristics of magnetic resonance coupling. We start with a basic coil shape, and then introduce an open type and short type. Next, we explain the characteristics of magnetic resonance coupling power transmission.
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Inexpensive time dissemination using magnetically coupled resonators
2014 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS), 2014Synchronization is an important feature in wireless sensor networks, often needed to enable correct operation. In this paper, the usage of magnetic field coupling is explored, to provide Time of Flight information, useful to develop a timestamp based clock distribution system.
DE ANGELIS, ALESSIO +7 more
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