Improvement in Transmission Efficiency for Cavity Resonance Enabled Wireless Power Transfer by Handling Cavity Impedance

Nimura, Shinji; Furusu, Daigo; Takano, Ippei; Tamura, Masaya

doi:10.23919/apmc.2018.8617389

Cited by 6 publications

(2 citation statements)

References 4 publications

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“…where operator ''Re[•]'' selects the real part of the argument. By substituting (23) into (20) and utilizing (19), 2 (24) or…”

Section: B Closed-form Expression Of Maximum Power Transmission Effimentioning

confidence: 99%

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Reconfigurable Wireless Power Transmission in Fully-Enclosed Space Using Antenna Array

Wang

et al. 2019

IEEE Access

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This paper studies employing antenna array to reconfigure wireless power transmission in fully-enclosed space (that is, environments enclosed by conducting walls, such as spacecrafts and engine compartments). Because strong coupling may appear among array elements, conventional phased array is not the best approach. We find parasitic array, which includes one driver element and multiple parasitic elements, an excellent candidate to achieve high power transmission efficiency in fully-enclosed space. Phased array and parasitic array are analyzed and compared with each other; closed-form expressions of maximum power transmission efficiency are derived when the array includes two elements. With the theoretical analysis as guideline, some experiments are conducted in a cubic box with size of 1 cubic meter and with aluminum walls. Experimental results demonstrate that, parasitic array offers higher power transmission efficiency than phased array in most of the scenarios. To be more specific, the power transmission efficiency could always reach 90% when a parasitic array includes 4 elements (i.e., 1 driver element and 3 parasitic elements) and when the receiver changes its location in a 60 cm by 60 cm region. INDEX TERMS Antenna arrays, cavities, microwave propagation, reconfigurable antennas, wireless power transmission.

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“…where operator ''Re[•]'' selects the real part of the argument. By substituting (23) into (20) and utilizing (19), 2 (24) or…”

Section: B Closed-form Expression Of Maximum Power Transmission Effimentioning

confidence: 99%

“…The other antenna elements in the parasitic array, termed as ''parasitic elements,'' are terminated by purely-reactive loads. A similar scheme is proposed in [19], in which the parasitic elements are termed ''matching probes.'' Parasitic array is not a new concept.…”

Section: Introductionmentioning

confidence: 99%