# US 2019/0168013 A1 · Systems for controlling power to differently loaded antenna arrays > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0168013 A1 - Document ID: US20190168013A1 - Status: Published application - Kind: A1 - Application number: 16/273,519 - Filed: 2019-02-12 - Published: 2019-06-06 - Earliest claimed: 2013-03-11 - Assignees: NeuroEM Therapeutics, Inc. - Applicants: NeuroEM Therapeutics, Inc. - Inventors: Gary W. Arendash; Rob Baranowski - Web page: https://patentgrep.com/patent/US20190168013A1 ## CPC - A61N 1/40: Applying electric fields by inductive or capacitive coupling (microwave apparatus A61N5/00); {Applying radio-frequency signals} - H03F 3/19: with semiconductor devices only - A61N 1/0476: {Array electrodes (including any electrode arrangement with more than one electrode for at least one of the polarities)} - A61N 5/04: Radiators for near-field treatment - H03G 3/30: in amplifiers having semiconductor devices - H03G 3/3036: {in high-frequency amplifiers or in frequency-changers (H03G3/3052, H03G3/32, H03G3/34 take precedence)} - H03G 3/3042: {in modulators, frequency-changers, transmitters or power amplifiers} - A61N 2/006: {for magnetic stimulation of nerve tissue} - H01Q 1/273: {Adaptation for carrying or wearing by persons or animals} - H03F 2200/451: the amplifier being a radio frequency amplifier - H03G 2201/103: being an amplifying element - H03G 2201/106: being attenuating element - H03G 2201/307: being radio frequency signal - A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B) - H03F: AMPLIFIERS - H03G: CONTROL OF AMPLIFICATION - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## Abstract In one example in accordance with the present disclosure, an antenna system is described. The antenna system includes an array of antennas. Each antenna emits electromagnetic waves and is presented with a load that is different from other antennas in the array. The antenna system also includes a control system. The control system includes a single transmitter to sequentially 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. The controller determines an actual power output of each antenna and generates an adjusted control signal for the single transmitter such that the output of each antenna is controlled to match a target power for that antenna, regardless of a load for the antenna. ## Claims ### Claim 1 An antenna system, 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 sequentially 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 an actual power output of each antenna; and generate an adjusted control signal for the single transmitter such that the power output of each antenna is controlled to match a target power for that antenna, regardless of a load for the antenna. ### Claim 2 (depends on 1) The system of claim 1, wherein the antenna set includes at least one of: a single antenna to be active at a given time; and multiple antennas to be active at the given time, wherein a driving signal from the single transmitter is divided between the multiple antennas. ### Claim 3 (depends on 1) The system of claim 1, wherein multiple antennas in the array focus beams in a particular direction within a subject. ### Claim 4 (depends on 1) The system of claim 1, wherein the controller sequentially determines an actual power output of each antenna and generates, per activation sequence, an adjusted control signal for the single transmitter until at least one antenna in the array has a power output that matches an average power output across all antenna sets, regardless of a load for the antenna. ### Claim 5 (depends on 1) The system of claim 1, wherein the controller generates an adjusted control signal during a switch between activation periods. ### Claim 6 (depends on 1) The system of claim 1, wherein the controller varies a phase of at least one antenna output within an active set to steer a beam. ### Claim 7 (depends on 1) The system of claim 1, wherein the controller varies a power of at least one antenna output within an active set to control a relative power between each antenna set. ### Claim 8 (depends on 1) The system of claim 1, wherein the controller dampens the adjusted control signal to ensure sequential adjustments do not overshoot. ### Claim 9 (depends on 1) The system of claim 1, wherein the switching device comprises at least one of: a variable attenuator per antenna coupled to a respective switch; a phase shifter per antenna coupled to a respective variable attenuator; and an impedance matcher. ### Claim 10 (depends on 1) The system of claim 1, wherein the control system further comprises at least one of: a charging device; an internal battery; and a control panel. ### Claim 11 (depends on 1) The system of claim 1: further comprising a power control system disposed in at least one of the transmitter and the controller; and wherein: the transmitter comprises: an oscillator; a variable gain amplifier (VGA); a power amplifier; and a coupler; and the controller comprises: a control voltage generator; and a (VGA) control signal generator. ### Claim 12 (depends on 11) The system of claim 11, wherein the VGA control signal generator comprises a fixed value control signal generator. ### Claim 13 (depends on 11) The system of claim 11, wherein: the controller comprises: a voltage detector; an offset memory storage device; and the VGA control signal generator is to generate the VGA control signal based on a detected voltage and an offset. ### Claim 14 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. ### Claim 15 (depends on 14) The method of claim 14, wherein: the at least one antenna is an antenna within the array of antennas with a greatest offset; and an activation period in which the control signal is adjusted is the only activation period within an activation sequence with an adjusted control signal. ### Claim 16 (depends on 14) The method of claim 14, further comprising, detecting a defective antenna based on the offset. ### Claim 17 (depends on 14) The method of claim 14, further comprising adjusting a phase of an output for each antenna in the antenna set to focus the electromagnetic waves to a particular location on a subject. ### Claim 18 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. ### Claim 19 (depends on 18) The electromagnetic treatment device of claim 18, further comprising an AC-DC adapter to charge the control system. ### Claim 20 (depends on 18) The electromagnetic treatment device of claim 18, wherein the electromagnetic treatment device is for treatment or prevention of neurodegenerative diseases and conditions and for the enhancement of unimpaired cognitive function. ### Claim 21 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.