2026-09-19T16:55:51Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/1037412026-06-16T18:54:21Zcom_1721.1_7582com_1721.1_7581col_1721.1_131022
Dina Katabi.
Shi, Lixin, Ph. D. Massachusetts Institute of Technology
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science.
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
2016-07-18T20:05:35Z
2016-07-18T20:05:35Z
2016
2016
http://hdl.handle.net/1721.1/103741
953525313
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2016.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 147-153).
Each year, consumers carry an increasing number of mobile devices on their person: mobile phones, tablets, smartwatches, etc. As a result, users must remember to recharge each device, every day. Wireless charging promises to free users from this burden, allowing devices to remain permanently unplugged. Today's wireless charging, however, is either limited to a single device, or is highly cumbersome, requiring the user to remove all of her wearable and handheld gadgets and place them on a charging pad. This thesis proposes MultiSpot, a new wireless charging technology that can charge multiple devices, even as the user is wearing them or carrying them in her pocket. A MultiSpot charger acts as an access point for wireless power. When a user enters the vicinity of the MultiSpot charger, all of her gadgets start to charge automatically. It achieves this by tracking multiple receivers and focusing the magnetic field from multiple transmit coils in a provably optimal way. We have prototyped MultiSpot and evaluated it using off-the-shelf mobile phones, smartwatches, and tablets. Our results show that MultiSpot can charge six devices at distances of up to 50 cm.
by Lixin Shi.
Ph.D.
153 pages
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Electrical Engineering and Computer Science.
Orientation-indepedent wireless charging of multiple mobile devices at a distance
Thesis
application/pdf
Publication
unknown
unknown
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<Abstract>Each year, consumers carry an increasing number of mobile devices on their person: mobile phones, tablets, smartwatches, etc. As a result, users must remember to recharge each device, every day. Wireless charging promises to free users from this burden, allowing devices to remain permanently unplugged. Today's wireless charging, however, is either limited to a single device, or is highly cumbersome, requiring the user to remove all of her wearable and handheld gadgets and place them on a charging pad. This thesis proposes MultiSpot, a new wireless charging technology that can charge multiple devices, even as the user is wearing them or carrying them in her pocket. A MultiSpot charger acts as an access point for wireless power. When a user enters the vicinity of the MultiSpot charger, all of her gadgets start to charge automatically. It achieves this by tracking multiple receivers and focusing the magnetic field from multiple transmit coils in a provably optimal way. We have prototyped MultiSpot and evaluated it using off-the-shelf mobile phones, smartwatches, and tablets. Our results show that MultiSpot can charge six devices at distances of up to 50 cm.</Abstract>
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