455 results about "Beam switching" patented technology

Ultrafast directional beam switching, using coupled VCSELs is combined with a light modulator to provide information transfer at bit rates of tens of GHz. This approach is demonstrated to achieve beam switching frequencies of 32-50 GHz in some embodiments and directional beam switching with angular differences of about eight degrees. This switching scheme is likely to be useful for ultrafast optical networks at frequencies much higher than achievable with other approaches. A Mach-Zehnder interferometer, a Fabry-Peror etalon, or a semiconductor-based electro-absorption transmission channel, among others, can be used as a light modulator.

A point to multipoint device for use in a wireless network to provide wireless communication with a plurality of telecommunications units is described, for communication from the point to multipoint device to the telecommunications units, the point to multipoint device being operable to employ multiple sets of beams, at any point in time one set being used. The point to multipoint device comprises beam set generation logic for generating the multiple sets of beams arranged into one or more groups, each group comprising one beam from each set. Within each group the beams of that group are orthogonal with respect to each other, and each beam within each set is generated randomly with respect to other beams in that set. An interface is provided for receiving a synchronisation signal issued to all point to multipoint devices in the wireless network. Beam switching logic is then used to determine, having regard to the synchronisation signal, switch times at which the point to multipoint device switches from one set of beams to another set of beams, the switch times being the same for all point to multipoint devices in the wireless network. An antenna array is controlled by the beam switching logic to produce at any point in time one of the sets of beams for transmitting data forming the communication to the telecommunications units. The use of such sets of beams has been found to lower the average co-channel interference observed within the wireless network.

Systems and methods are described for robust scheduling of beam switching patterns in satellite communications systems. Embodiments operate in context of a hub-spoke satellite communications architecture having a number of gateway terminals servicing large numbers of user terminals over a number of spot beams. The satellite includes switching subsystems that distribute capacity to the user beams from multiple of the gateway terminals in a shared manner according to a beam group switching pattern. The beam group switching pattern is robustly formulated to continue distributing capacity during gateway outages (e.g., when one or two gateway terminals are temporarily non-operational due to rain fade, equipment failure, etc.). For example, the beam group switching pattern can be formulated to minimize worst-case degradation of capacity across user beams, to prioritize certain beams or beam groups, etc.

A laser beam switching system employs a laser coupled to a beam switching device that causes a laser beam to switch between first and second beam positioning heads such that while the first beam positioning head is directing the laser beam to process a workpiece target location, the second beam positioning head is moving to another target location and vice versa. A preferred beam switching device includes first and second AOMs positioned such that the laser beam passes through the AOMs without being deflected. When RF is applied to the first AOM, the laser beam is diffracted toward the first beam positioning head, and when RF is applied to the second AOM, the laser beam is diffracted toward the second beam positioning head.

Systems and methods herein remedy thermal constraints experienced by wireless communication systems operating in the millimeter wave spectrum. User equipment (UE) having a plurality of antenna subarrays controlled by respective RFICs monitor temperature gradients of respective sectors of the UE. Upon the thermal gradient of a sector reaching a temperature threshold, the UE performs thermal management steps to prevent hardware of a respective sector from damage due to overshoot.

The invention discloses a rotary electromagnetic actuating mechanism and a car lamp upper and lower beam switching device thereof, and relates to an illuminating device or functional characteristics or parts of a system of the illuminating device. The rotary electromagnetic actuating mechanism comprises a shell, a rotor, a stator, a rotary shaft and an end cover; stator windings are arranged on the stator, and the stator and the stator windings are fixedly mounted in the shell to form a pair of arc-shaped stator magnetic poles capable of being electrified to be excited; the rotor is an arc-shaped permanent magnet, is fixed onto the rotary shaft, is placed in magnetic field space of the arc-shaped stator magnetic poles and is matched with the arc-shaped stator magnetic poles, so that a closed magnetic circuit with air gaps is formed; and two ends of the rotary shaft are respectively connected with two oscillating bars radially extending along the rotary shaft. A shading plate of the car lamp upper and lower beam switching device is fixedly connected onto the oscillating bars at the two ends of the rotary shaft, an oscillating angle of the shading plate is identical to a rotation angle of the rotor, the rotary electromagnetic actuating mechanism drives the shading plate to realize switching between upper beams and lower beams, collision noise generated when electromagnets are sucked and released is avoided, and a comfortable driving environment is provided for users.

A beam switching antenna system and method and apparatus for controlling the same is provided, by which optimal antenna characteristics can be maintained according to a peripheral environment, the necessary time and power consumption of searching an optimal beam-direction can be reduced, and electromagnetic waves of a beam generated from an antenna can be minimized. The beam switching antenna system includes an antenna element for transmitting and receiving a beam; a dielectric body surrounding said antenna element; at least one conductive reflector facing a lateral outside of said dielectric body; and a ground switch circuit connected to said at least one conductive reflector. The ground switch circuit includes a reference voltage source generating a reference voltage; a ground line connected to the reference voltage source; an electrical switching device connected between the ground line and the conductive reflector; and a controller for controlling the electrical switching device. The conductive reflector includes an upper conductive reflector having one end connected to one terminal of the electrical switching device; and a lower conductive reflector having one end connected to another terminal of the electrical switching device and the other end connected to the ground line.