Systems for controlling power to differently loaded antenna arrays

A method, comprising:

• determining, for each antenna in an array of antennas, a difference between an actual power output for each antenna and an average power output of all antenna sets;
• adjusting, a control signal for a single transmitter coupled to each antenna in the array such that a power output of each antenna is controlled to match a target power for that antenna, regardless of a load for the antenna;
• and
• driving, via the single transmitter, the at least one antenna based on a first adjusted control signal.

An electromagnetic treatment device comprising:

• a head unit to hold antennas in predetermined positions relative to the head, the head unit comprising an array of antennas, each antenna to emit electromagnetic waves, wherein each antenna is presented with a load that is different from other antennas in the array;
• and
• a control system, comprising:
• a single transmitter to drive antenna sets;
• a switching device to select, for each activation period in an activation sequence, an antenna set to be driven;
• and
• a controller to:
• determine a power output of each antenna;
• and
• generate an adjusted control signal for the single transmitter such that the power output of at least one antenna is controlled to match a target power for that antenna, regardless of a load for the antenna.

An electromagnetic treatment device, comprising:

• a head unit to hold antennas in predetermined positions relative to the head, the head unit comprising an array of antennas, each antenna to emit electromagnetic waves;
• and
• a control system, comprising:
• a single transmitter to drive antenna sets;
• a switching device to select, for each activation period in an activation sequence, an antenna set to be driven;
• and
• a controller to adjust a phase of an output for each antenna in the antenna set focus the electromagnetic waves to a particular location on a subject.