An aircraft has a first antenna arrangement, a payload and a processing unit. The first antenna arrangement is designed to wirelessly receive electromagnetic signals. The processing unit is coupled to the first antenna arrangement, on the one hand, and to the payload, on the other hand. The processing unit is designed to modulate an electromagnetic signal received by the first antenna arrangement and thereby to generate a first modulated signal and to forward it to the payload. The payload is designed to use the first modulated signal as working signal. A radiofrequency power signal on an uplink is thus remodulated into a payload working signal, such that the payload working signal is able to be used directly by the payload without rectification into a DC voltage.

An aircraft has a first antenna arrangement, a payload and a processing unit. The first antenna arrangement is designed to wirelessly receive electromagnetic signals. The processing unit is coupled to the first antenna arrangement, on the one hand, and to the payload, on the other hand. The processing unit is designed to modulate an electromagnetic signal received by the first antenna arrangement and thereby to generate a first modulated signal and to forward it to the payload. The payload is designed to use the first modulated signal as working signal. A radiofrequency power signal on an uplink is thus remodulated into a payload working signal, such that the payload working signal is able to be used directly by the payload without rectification into a DC voltage.

A radio frequency power recovery unit, comprises a plurality of rectennas, each comprising an antenna and a capacitor configured to be charged by energy received by the antenna; a plurality of switches, each configured to selectively connect a respective one of the plurality of rectennas to an energy storage device, such that the respective capacitor is charged by energy received by the ntenna while the respective switch is open, and such that the respective capacitor is discharged to the energy storage device while the respective switch is closed; and a control unit, configured to selectively open and close the switches in a predetermined sequence.

A radio frequency power recovery unit, comprises a plurality of rectennas, each comprising an antenna and a capacitor configured to be charged by energy received by the antenna; a plurality of switches, each configured to selectively connect a respective one of the plurality of rectennas to an energy storage device, such that the respective capacitor is charged by energy received by the ntenna while the respective switch is open, and such that the respective capacitor is discharged to the energy storage device while the respective switch is closed; and a control unit, configured to selectively open and close the switches in a predetermined sequence.

An example system includes a wireless-power transmitter configured to emit a first set of one or more radio frequency (RB signals and a security camera coupled to a wireless-power receiver. The wireless-power receiver is configured to receive the first set of one or more RF signals. The security camera includes at least one component for converting energy from the first set of one or more RF signals into usable power to power the security camera. The usable power is a primary source of power for the security camera. The example system can also include a processor in communication with the wireless-power transmitter configured to, in accordance with a determination that the security camera has moved relative to the wireless-power transmitter, adjust the wireless-power transmitter to emit a second set of one or more RF signals from the wireless-power transmitter to continue providing usable power to the security camera.

A wireless-power harvester integrated in a small device, comprising a stamped metal harvesting antenna. The stamped metal antenna is formed into a meandering shape. A first end of the meandering shape is a free end positioned within free space of a housing of a small device, and a second end of the meandering shape is coupled to a PCB that includes electrical components for operating and powering the small device. The PCB is configured to operate as a ground plane for the stamped metal antenna. An intermediate portion, disposed between the first end and the second end of the meandering shape, is coupled to power-conversion circuitry that is separate from the PCB. The power-conversion circuitry is configured to convert the one or more RF power waves harvested by the stamped metal harvesting antenna into usable energy for charging a battery of the small device or for powering the small device.

A wireless-power harvester integrated in a small device, comprising a stamped metal harvesting antenna. The stamped metal antenna is formed into a meandering shape. A first end of the meandering shape is a free end positioned within free space of a housing of a small device, and a second end of the meandering shape is coupled to a PCB that includes electrical components for operating and powering the small device. The PCB is configured to operate as a ground plane for the stamped metal antenna. An intermediate portion, disposed between the first end and the second end of the meandering shape, is coupled to power-conversion circuitry that is separate from the PCB. The power-conversion circuitry is configured to convert the one or more RF power waves harvested by the stamped metal harvesting antenna into usable energy for charging a battery of the small device or for powering the small device.

An auxiliary power receiving device includes a power receiving unit configured to receive power from a power transfer signal, which is used to supply power from a power transmitting device to a power receiving device, a notification unit configured to be provided on a main surface of a plate-shaped member, and a notification controlling unit configured to control a notification performed by the notification unit in accordance with a power reception condition of the power transfer signal at the power receiving unit.

An auxiliary power receiving device includes a power receiving unit configured to receive power from a power transfer signal, which is used to supply power from a power transmitting device to a power receiving device, a notification unit configured to be provided on a main surface of a plate-shaped member, and a notification controlling unit configured to control a notification performed by the notification unit in accordance with a power reception condition of the power transfer signal at the power receiving unit.

A method of a charging apparatus for controlling wireless charging is provided. The method includes detecting an electronic device, determining a charging method corresponding to the detected electronic device, and wirelessly charging the electronic device by selecting a coil corresponding to the determined charging method.