Wireless power transmission
First Claim
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1. A method of wirelessly delivering power via a phased antenna array, the method comprising:
- transmitting with a transmission system, a narrow beam of radio-frequency energy having a solid angle, an elevation angle, and an azimuthal angle;
receiving the narrow beam of radio-frequency energy with a power receiver and if the received radio-frequency energy is above a predetermined threshold, backscattering a portion of the received radio-frequency energy back towards the phased antenna array;
receiving the backscattered portion and determining a path loss and a phase shift associated therewith;
associating the determined path loss and phase shift with the elevation angle and azimuthal angle and storing the association in a hash table;
identifying a most efficient transmission path based on the associations stored in the hash table;
determining a set of supporting paths that constructively interfere with the most efficient path such that the supporting paths are within 10 degrees of the most efficient path and have less than 4 dB of loss relative to the most efficient path;
directing energy along the most efficient transmission path and stochastically transmitting energy along the set of supporting paths and recording the transmission efficiencies thereof;
identifying the most efficient set of supporting paths; and
phase modulating the phased antenna array to transmit energy along the most efficient transmission path and the most efficient set of supporting paths.
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Abstract
A radio-frequency power transmitter. The radio-frequency power transmitter includes an array of patch antennas, an array of phase modulators, each phase modulator having an input port and associated with one or more of the patch antennas, a local oscillator that provides an oscillatory signal to the input port of each of the phase modulators, an array of amplifiers, each amplifier receiving an input from one of the phase modulators, and a microprocessor configured to interface with the array of phase modulators and control a holistic radiative power transmission vector pattern generated by the radio-frequency power transmitter.
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Citations
15 Claims
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1. A method of wirelessly delivering power via a phased antenna array, the method comprising:
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transmitting with a transmission system, a narrow beam of radio-frequency energy having a solid angle, an elevation angle, and an azimuthal angle; receiving the narrow beam of radio-frequency energy with a power receiver and if the received radio-frequency energy is above a predetermined threshold, backscattering a portion of the received radio-frequency energy back towards the phased antenna array; receiving the backscattered portion and determining a path loss and a phase shift associated therewith; associating the determined path loss and phase shift with the elevation angle and azimuthal angle and storing the association in a hash table; identifying a most efficient transmission path based on the associations stored in the hash table; determining a set of supporting paths that constructively interfere with the most efficient path such that the supporting paths are within 10 degrees of the most efficient path and have less than 4 dB of loss relative to the most efficient path; directing energy along the most efficient transmission path and stochastically transmitting energy along the set of supporting paths and recording the transmission efficiencies thereof; identifying the most efficient set of supporting paths; and phase modulating the phased antenna array to transmit energy along the most efficient transmission path and the most efficient set of supporting paths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification