Antenna Arrangement for Wireless Powering
First Claim
1. An antenna arrangement for transmitting energy, comprising:
- a planar array of two or more rectangular loop antennas, each rectangular loop antenna adapted to transmit energy at low frequencies via non-radiative resonant coupling and at high frequencies via radiative coupling, the low frequencies corresponding to a wavelength larger than twice a longest rectangular loop antenna dimension and the high frequencies corresponding to a wavelength approximately equal to twice the longest rectangular loop antenna dimension, the high frequencies being suitable for transmitting energy over larger distances than the low frequencies, the planar array so configured that a fixed focal area is created in front of an aperture of the planar array, the fixed focal area being in the near-field of the planar array;
a feeding network connected to the planar array and comprising a phase shifter for providing a phase difference between signals at the high frequencies to be transmitted by different rectangular loop antennas of the planar array, wherein the amount of phase difference compensates for a difference between a distance of the rectangular loop antennas to a focal point in the fixed focal area in the near-field of the planar array and a distance of the focal point to the planar array; and
a power divider/combiner adapted for distributing the signals applied to the feeding network.
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Accused Products
Abstract
An antenna arrangement for transmitting energy is described. The antenna arrangement includes a planar array of two or more rectangular loop antennas, adapted to transmit energy at low frequencies via non-radiative resonant coupling and at high frequencies via radiative coupling. The low frequencies correspond to a wavelength with half of the wavelength being larger than the longest rectangular loop antenna dimension and the high frequencies correspond to a wavelength with half of the wavelength being approximately equal the longest rectangular loop antenna dimension. The antenna arrangement also includes a feeding network connected to the planar array, which includes a phase shifting means for providing a phase difference between signals at the high frequencies to be transmitted by different rectangular loop antennas of the planar array, whereby the amount of phase difference is related to the distance of the rectangular loop antennas to a focal point in the near-field of the planar array. The antenna arrangement also includes means adapted for distributing the signals applied to the feeding network.
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Citations
18 Claims
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1. An antenna arrangement for transmitting energy, comprising:
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a planar array of two or more rectangular loop antennas, each rectangular loop antenna adapted to transmit energy at low frequencies via non-radiative resonant coupling and at high frequencies via radiative coupling, the low frequencies corresponding to a wavelength larger than twice a longest rectangular loop antenna dimension and the high frequencies corresponding to a wavelength approximately equal to twice the longest rectangular loop antenna dimension, the high frequencies being suitable for transmitting energy over larger distances than the low frequencies, the planar array so configured that a fixed focal area is created in front of an aperture of the planar array, the fixed focal area being in the near-field of the planar array; a feeding network connected to the planar array and comprising a phase shifter for providing a phase difference between signals at the high frequencies to be transmitted by different rectangular loop antennas of the planar array, wherein the amount of phase difference compensates for a difference between a distance of the rectangular loop antennas to a focal point in the fixed focal area in the near-field of the planar array and a distance of the focal point to the planar array; and a power divider/combiner adapted for distributing the signals applied to the feeding network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An antenna arrangement for receiving energy, comprising:
at least one rectangular loop antenna adapted to receive energy at low frequencies via non-radiative resonant coupling and at high frequencies via radiative coupling, the low frequencies corresponding to a wavelength larger than twice a longest rectangular loop antenna dimension and the high frequencies corresponding to a wavelength approximately equal to twice the longest rectangular loop antenna dimension, the high frequencies being suitable for receiving energy transmitted from larger distances than the low frequencies. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for charging a device having an antenna arrangement for receiving energy that includes at least one rectangular loop antenna adapted to receive energy at low frequencies via non-radiative resonant coupling and at high frequencies via radiative coupling, the low frequencies corresponding to a wavelength larger than twice a longest rectangular loop antenna dimension and the high frequencies corresponding to a wavelength approximately equal to twice the longest rectangular loop antenna dimension, the high frequencies being suitable for receiving energy transmitted from larger distances than the low frequencies, comprising:
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approaching the device with a powering station that includes an antenna arrangement for transmitting energy and operates at a frequency at which energy is transmitted via radiative coupling, wherein radiation is focused in a near-field of the antenna arrangement for transmitting energy, and wherein the antenna arrangement for transmitting energy comprises; a planar array of two or more rectangular loop antennas, each rectangular loop antenna adapted to transmit energy at the low frequencies via non-radiative resonant coupling and at the high frequencies via radiative coupling, the planar array so configured that a fixed focal area is created in front of an aperture of the planar array, the fixed focal area being in a near-field of the planar array; a feeding network connected to the planar array and comprising a phase shifter for providing a phase difference between signals at the high frequencies to be transmitted by different rectangular loop antennas of the planar array, wherein the amount of phase difference compensates for a difference between a distance of the rectangular loop antennas to a focal point in the fixed focal area in the near-field of the planar array and a distance of the focal point to the planar array; and a power divider/combiner adapted for distributing the signals applied to the feeding network.
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18. Antenna arrangement for transmitting energy, comprising:
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a planar array of two or more rectangular loop antennas, each rectangular loop antenna adapted to transmit energy at low frequencies via non-radiative resonant coupling and at high frequencies via radiative coupling, the low frequencies corresponding to a wavelength larger than twice a longest rectangular loop antenna dimension and the high frequencies corresponding to a wavelength approximately equal to twice the longest rectangular loop antenna dimension, the high frequencies being suitable for transmitting energy over larger distances than the low frequencies, the planar array so configured that a fixed focal area is created in front of an aperture of the planar array, the fixed focal area being in a near-field of the planar array; a feeding network connected to the planar array and comprising phase shifting means for providing a phase difference between signals at the high frequencies to be transmitted by different rectangular loop antennas of the planar array, wherein the amount of phase difference compensates for a difference between a distance of the rectangular loop antennas to a focal point in the fixed focal area in the near-field of the planar array and a distance of the focal point to the planar array; and distribution means for distributing the signals applied to the feeding network.
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Specification