Shielded loops for wireless non-radiative power transfer

Thomas, Erin M.; Heebl, Jason D.; Grbic, Anthony

doi:10.1109/aps.2010.5562278

Cited by 12 publications

(6 citation statements)

References 3 publications

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“…Fig. 1 shows the lumped-element circuit model of a WNPT system based on resonant magnetic coupling between two electrically small loops [14], [15]. The variable M 12 = M 21 denotes the mutual inductance between two loops.…”

Section: Circuit Modelmentioning

confidence: 99%

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Comprehensive Analysis and Measurement of Frequency-Tuned and Impedance-Tuned Wireless Non-Radiative Power-Transfer Systems

Heebl

Thomas

Penno

et al. 2014

IEEE Antennas Propag. Mag.

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Abstract-This paper theoretically and experimentally investigates frequency-tuned and impedance-tuned wireless nonradiative power transfer (WNPT) systems. Closed-form expressions for the efficiencies of both systems, as a function of frequency and system (circuit) parameters, are presented. In the frequency-tuned system, the operating frequency is adjusted to compensate for changes in mutual inductance that occur for variations of transmitter and receiver loop positions. Frequencytuning is employed for a range of distances over which the loops are strongly coupled. In contrast, the impedance-tuned system employs varactor-based matching networks to compensate for changes in mutual inductance and achieve a simultaneous conjugate impedance match over a range of distances. The frequencytuned system is simpler to implement, while the impedance-tuned system is more complex but can achieve higher efficiencies. Both of the experimental WNPT systems studied employ resonant shielded loops as transmitting and receiving devices.

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Section: Circuit Modelmentioning

confidence: 99%

“…In [14], [15], WNPT utilizing two coupled shielded-loop resonators, instead of resonant coils, was reported. Closedform expressions for the loops' circuit parameters, input and output impedances, and efficiency were developed from a circuit model of the system.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis and Measurement of Frequency-Tuned and Impedance-Tuned Wireless Non-Radiative Power-Transfer Systems

Heebl

Thomas

Penno

et al. 2014

IEEE Antennas Propag. Mag.

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“…In coaxial shielded loops, currents exist on the interior and exterior of the outer conductor, separated by the skin effect [12], [13]. However, this paper shows that such separation is not required.…”

Section: Arxiv:14021219v1 [Csoh] 6 Feb 2014mentioning

confidence: 95%

“…Coaxial, shielded-loop resonators were recently used as receiving and transmitting loops in a WNPT system [12], [13]. The fields generated by shielded-loop resonators are similar to those generated by classical resonators.…”

Section: Introductionmentioning

confidence: 99%

Planar Shielded-Loop Resonators

Tierney

Grbic

2014

IEEE Trans. Antennas Propagat.

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Abstract-The design and analysis of planar shielded-loop resonators for use in wireless non-radiative power transfer systems is presented. The difficulties associated with coaxial shieldedloop resonators for wireless power transfer are discussed and planar alternatives are proposed. The currents along these planar structures are analyzed and first-order design equations are presented in the form of a circuit model. In addition, the planar structures are simulated and fabricated. Planar shielded-loop resonators are compact and simple to fabricate. Moreover, they are well-suited for printed circuit board designs or integrated circuits.

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“…This has focused the attention on the case of inductive resonant coils for wireless energy transfer [12,13]. In particular, in [10,11,12,14], it has been noted that this type of subject is investigated much better by using a network approach instead of adopting the coupled mode theory originally proposed in [2][3][4]. Moreover, in [13], it has also been observed that additional, passive, resonators may help in extending the range.…”

Section: Introductionmentioning

confidence: 99%

A novel coaxial loop resonator for wireless power transfer

Dionigi

Mongiardo

2012

Int J RF and Microwave Comp Aid Eng

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We present a novel resonator, based on a coaxial cable structure, suitable for wireless power transfer (WPT) applications. Its advantages are compactness, ease of manufacture, and low cost. WPT resonators generally operate in the HF, LF bands, using magnetic field coupling and a lumped capacitance for achieving the sought resonance. In our structure, the electric field is primarily confined inside the coaxial cable, whereas the magnetic field is generated by the currents flowing on the external conductors. The article describes the resonator structure, illustrates its design procedure, and discusses quality factor contributions. A few resonators with Q higher than 900, operating around 30 MHz, have been built, simulated, and measured confirming the validity of the proposed approach. V C 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE 00:000-000, 2012.

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Shielded loops for wireless non-radiative power transfer

Cited by 12 publications

References 3 publications

Comprehensive Analysis and Measurement of Frequency-Tuned and Impedance-Tuned Wireless Non-Radiative Power-Transfer Systems

Comprehensive Analysis and Measurement of Frequency-Tuned and Impedance-Tuned Wireless Non-Radiative Power-Transfer Systems

Planar Shielded-Loop Resonators

A novel coaxial loop resonator for wireless power transfer

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