Wireless power range increase using parasitic antennas
First Claim
Patent Images
1. A system for wirelessly transferring power to a device, the system comprising:
- a wireless power transmitter including a transmitting antenna of a first dimension, the transmitting antenna being configured to resonate at a resonant frequency and to transmit wireless power via a first wireless field; and
a repeater antenna having a second dimension that is different than the first dimension, the repeater antenna being configured to resonate at substantially the same resonant frequency and retransmit wireless power received from the wireless power transmitter via a second wireless field, the repeater antenna having a short-circuited portion configured to adjust a resonant frequency of the repeater antenna.
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Accused Products
Abstract
Wireless power transfer is created using a first antenna that is part of a magnetic resonator, to create a magnetic field in an area of the first antenna. One or more parasitic antennas repeats that power to create local areas where the power is more efficiently received.
38 Citations
56 Claims
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1. A system for wirelessly transferring power to a device, the system comprising:
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a wireless power transmitter including a transmitting antenna of a first dimension, the transmitting antenna being configured to resonate at a resonant frequency and to transmit wireless power via a first wireless field; and a repeater antenna having a second dimension that is different than the first dimension, the repeater antenna being configured to resonate at substantially the same resonant frequency and retransmit wireless power received from the wireless power transmitter via a second wireless field, the repeater antenna having a short-circuited portion configured to adjust a resonant frequency of the repeater antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for wirelessly transferring power from a transmitting antenna to a device, the system comprising:
a repeater antenna having a first dimension, the repeater antenna being tuned to resonate at a resonant frequency and receive wireless power transferred via a first wireless field from the transmitting antenna having a second dimension that is different than the first dimension, the transmitting antenna being configured to resonate at substantially the same resonant frequency, the repeater antenna configured to retransmit the received wireless power via a second wireless field, the repeater antenna having a short-circuited portion configured to adjust the resonant frequency of the repeater antenna. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 40)
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37. A system, comprising:
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a wireless power transmitter configured to generate a wireless power transmission field at a specified frequency; and a transmitting antenna coupled to the wireless power transmitter and having a first antenna area, the transmitting antenna being configured to transmit wireless power at the specified frequency, the transmitting antenna having an antenna loop that extends around a perimeter of the first antenna area, the antenna loop having an inductance, the transmitting antenna having a capacitance, the inductance and the capacitance corresponding to an LC value causing the transmitting antenna to be substantially resonant at the specified frequency, the antenna loop having a first section at a first level and a second section at a second level that is different than the first level. - View Dependent Claims (38, 39, 41, 42, 43)
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44. A method of wireless transferring power, comprising:
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transmitting wireless power from a first antenna via a first wireless field, the first antenna having a first dimension and configured to resonate at a resonant frequency; retransmitting power received via the first wireless field with a second antenna within a range of the first antenna to a portable device to power the portable device via a second wireless field, the second antenna having a second dimension that is different than the first dimension and being configured to resonate at the resonant frequency; and short circuiting a portion of the second antenna to adjust the resonant frequency of the second antenna. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53)
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54. A system for wirelessly transferring power to a device, the system comprising:
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means for transmitting wireless power via a first wireless field, the means for transmitting wireless power having a first dimension and configured to resonate at a resonant frequency; means for retransmitting wireless power received from the means for transmitting wireless power in an area via a second wireless field, the means for retransmitting wireless power having a second dimension that is different than the first dimension and being configured to resonate at substantially the same resonant frequency; and means for short circuiting the means for retransmitting to adjust a resonant frequency of the means for retransmitting.
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55. A system for wirelessly transferring power from a transmitting antenna to a device, the system comprising:
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means for retransmitting wireless power via a first wireless field in an area, the means for retransmitting wireless power having a first dimension and being configured to receive power via a second wireless field from the transmitting antenna configured to resonate at a resonant frequency, the transmitting antenna having a second dimension that is different than the first dimension; means for short circuiting the means for retransmitting to adjust a resonant frequency of the means for retransmitting; and means for tuning the means for retransmitting wireless power to receive the wireless power from the second wireless field and cause the means for retransmitting wireless power to resonate at substantially the same resonant frequency.
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56. A method of wirelessly transferring power to a device, the method comprising:
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retransmitting wireless power received via a first wireless field with a repeater antenna within an area of the repeater antenna, the repeater antenna having a first dimension and being configured to receive power via a second wireless field from a transmitting antenna configured to resonate at a resonant frequency, the transmitting antenna having a second dimension that is different than the first dimension; adjusting a resonant frequency of the repeater antenna through a short circuited portion of the repeater antenna; and tuning the repeater antenna to resonate at substantially the same resonant frequency and receive the wireless power via the second wireless field.
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Specification