Phased array wireless power delivery optmization

A method of setting phases of a phased array comprising K transmit elements, wherein K is an integer, the method comprising:

• setting phases of M transmit elements to M different values during each of N different time intervals, wherein M and N are integers greater than 2;
• transmitting electromagnetic signals from the M transmit elements at each of the N time intervals;
• measuring a power of the electromagnetic signals at a receiving unit during each of the N time intervals;
• applying the measured powers to a basis function for each of the M transmit elements;
• and
• selecting coefficients of each of the basis functions such that a difference between N power values computed by the basis functions and the N measured power values associated with the N×M phases is smaller than a threshold value, wherein a measured power of the electromagnetic signal transmitted by a first one of the M transmit elements is defined by a phase Ø of the first transmit element, and a static phase offset φ of the first transmit element.

A phased array comprising a plurality of transmit elements and a controller configured to:

• set a phase of a first transmit element to N different phases during each of N different time intervals;
• cause an electromagnetic signal to be transmitted from the first transmit element at each of the N time intervals;
• receive a measurement of a power of the electromagnetic signal from a remote receiving unit during each of the N time intervals;
• applying the measured powers to a basis function;
• and
• select coefficients of the basis function such that a difference between a power value computed by the basis function and the received power value measurement associated with each of the N phases is smaller than a threshold value wherein a measured power of the electromagnetic signal transmitted by the first transmit element is defined by the phase Ø of the first transmit element, and a static phase offset φ of the first transmit element.

A phased array comprising K transmit elements, K being an integer, and a controller configured to:

• set phases of M transmit elements to M different phases during each of N different time intervals, wherein M an N are integers greater than 2;
• cause electromagnetic signals to be transmitted from the M transmit elements at each of the N time intervals;
• receive a measure of power of the electromagnetic signals from a remote receiving unit during each of the N time intervals;
• applying the measured powers to a basis function for each of the M transmit elements;
• and
• select coefficients of each of M basis functions such that a difference between N power values computed by the M basis functions and the N received power value measurements associated with the N×M phases is smaller than a threshold value, wherein a measured power of the electromagnetic signal transmitted by a first one of the M transmit elements is defined by a phase Ø of the first transmit element, and a static phase offset φ of the first transmit element.