Dynamic volumetric refocusing of arrays
An RF power delivery system includes, in part, an N×M array of transmitting elements disposed along N rows and M columns where M an N are integer numbers, and a phase adjustment unit adapted to receive information representative of a change in position of a device targeted to receive the RF power wirelessly from the device and generate a codeword in response, and apply the codeword to adjust phases of the array of transmitting elements.
1. An RF power delivery system comprising:
an N×M array of transmitting elements disposed along N rows and M columns, wherein M an N are integer numbers;
a phase adjustment unit adapted to:
receive information representative of a change in position of a device targeted to receive the RF power wirelessly from the device and generate a codeword in response; and
apply the codeword to adjust phases of the array of transmitting elements, wherein as the device moves from a first position defined by vector {right arrow over (R)} 0 to a second position defined by vector {right arrow over (R)} 1 , a change in the codeword applied to adjust the phase of a first transmitting element positioned m unit vectors from an origin of the array and along a first axis, and n unit vectors from the origin along a second axis, is defined by a path length difference from the first transmitting element to the first and second positions.
2. The RF power delivery system of claim 1 wherein as the device moves from the first position to the second position, the change in the codeword applied to adjust the phase of the first transmitting element is further defined by a slope of a clock multiplier of a phase/frequency locked loop disposed in the phase adjustment unit.
3. The RF power delivery system of claim 1 wherein as the device moves from the first position to the second position, the codeword applied to adjust the phase of the first transmitting element is retrieved from a look-up table.
4. The RF power delivery of claim 1 wherein said device determines its position using a sensor unit selected from a group consisting of an inertia measurement unit (IMU) or a global positioning system unit.
5. A method of transmitting RF power from an N×M array of transmitting elements disposed along N rows and M columns to a device, M and N being integers, the method comprising
receiving a position of a device wirelessly from the device;
generating a codeword in response to the position of the device; and
adjusting phases of the array of transmitting elements in accordance with the codeword, wherein as the device moves from a first position defined by vector {right arrow over (R)} 0 to a second position defined by vector {right arrow over (R)} 1 , a change in the codeword applied to adjust the phase of a first transmitting element positioned m unit vectors from an origin of the array and along a first axis, and n unit vectors from the origin along a second axis, is defined by a path length difference from the first transmitting element to the first and second positions.
6. The method of claim 5 wherein as the device moves from the first position to the second position, the change in the codeword applied to adjust the phase of the first transmitting element is further defined by a slope of a clock multiplier of a phase/frequency locked loop adapted to adjust the phases of the array of transmitting elements.
7. The method of claim 5 wherein as the device moves from the first position to the second position, the codeword applied to adjust the phase of the first transmitting element is retrieved from a look-up table.
8. The method of claim 5 wherein said device determines its position using a sensor unit selected from a group consisting of an inertia measurement unit (IMU) or a global positioning system unit.