A reconfigurable antenna system includes an antenna array; a set of metamaterial panels configured to surround the antenna array; a control unit, coupled to each of the metamaterial panels, for selectively addressing each of the metamaterial panels to control separately at least one property of each of the metamaterial panels; and a receiver coupled to the antenna array and to the control unit. The control unit is configured to monitor signal reception by the antenna array via the receiver and to establish a set of configurations of the metamaterial panels to produce a pattern of reception according to a set of prespecified criteria that include a set of azimuthal and elevational ranges characterizing the configurations. Optionally, the system further includes a transmitter coupled to the antenna array and to the control unit.

A light source is specified which comprises a planar semiconductor light source comprising a plurality of independently operable single emitters, wherein, during operation, each of the single emitters emits light via respective single luminous surface. Furthermore, the light source has a common optical element which is arranged directly downstream of the single emitters and which is embodied and intended to direct light from different single emitters into different solid angle regions, wherein the single emitters are arranged defocused with respect to the optical element and the individual light surfaces are imaged in a blurred manner by the optical element.

Examples of the present disclosure are related to systems and methods for voltage interfaces between legacy control systems and light sources. An example voltage interface may include a control loop including a first op-amp, an output loop including a second op-amp, and an optical isolator configured to electrically isolate the control loop from the output loop, the optical isolator being configured to receive an input signal from the control loop and transmit an output signal to the output loop.

A method for adjusting a voltage supply device for a multichannel LED control and power supply device having a determination of a number of LEDs that are connected to a multichannel LED control and power supply device or are a part of this device and that are switched on and supplied with current by the multichannel LED control and power supply device at a point in time, and a setting of a voltage with which the multichannel LED control and power supply device is supplied as a function of the number of LEDs determined that are switched on and supplied with current.

Provided is an apparatus including a regulator circuit configured to generate at least one positive supply voltage from at least a portion of a light-emitting diode (LED) driving current passed through an LED to supply power to a component included in a lighting apparatus; and a converter circuit configured to receive a first control signal from the component and output a second control signal for controlling the LED driving current by converting the first control signal.

An electronic device may have a display mounted in a housing. The housing may have a stand that supports the housing on a support surface or may have other shapes. The display may have pixels that display an image. The display may also have a two-dimensional array of light-emitting devices such as light-emitting diodes that supply backlight illumination for the pixels. An array of temperature sensors may be overlapped by the pixels. Control circuitry may maintain historical backlight aging information during operation of the display. The aging information may include information on output brightness levels of the light-emitting diodes and light-emitting diode operating temperatures.

A system for providing power over Ethernet illuminated signage is provided. The system includes receiving lighting instructions via an Ethernet compatible communications protocol, translating those instructions to a lower bandwidth, slower protocol while passing through DC power. Illumination fixtures are powered by the passed-through power and operated in accordance with the translated instructions.

A system of networked lighting devices includes a group of lighting device fixture controllers connected in a communication chain. The communication chain provides for transfer of data packets between the lighting device fixture controllers and a central controller. Each fixture controller includes a first power input that receives power from a primary power source, and a priority switch that is configured to switch the fixture controller from the primary power source to a source of DC power upon detecting failure of the primary power source. The source of DC power is sufficient to power the fixture controller and enable the fixture controller to continue to pass a stream of data to other controllers in the communication chain, but it is not sufficient to power the fixture controller's associated lighting device.

Methods and apparatus for matching an impedance of a process chamber with an impedance of an RF power source. In some embodiments, a method comprises dynamically matching a load impedance of the process chamber with an impedance matching circuit coupled between an RF power source and the process chamber, the impedance matching circuit configured to compensate for changes in the load impedance to match an impedance of the RF power source over a wide range of load impedances; filtering power feeding back from the process chamber with a first filter positioned between the matching circuit and the process chamber, the first filter configured as a wide bandpass filter; and filtering residual signals with a second filter positioned between the matching circuit and the RF power source, the second filter configured as a low pass filter.

A Light-Emitting Diode (LED) apparatus has a power source outputting a source DC power at a source DC voltage, a plurality of LEDs drivable at a driving DC voltage lower than the source DC voltage, and an electrical path connecting the power source to each LED for powering the LED by the power source. Each electrical path comprises a first portion connected to the power source at the source DC voltage and a second portion connected to the LED at the driving DC voltage, and the length of the first portion is longer than that of the second portion.