Abstract: This application relates to the field of wireless communication network technologies, and discloses a communication device, a communication control method, an electronic device, and a readable medium. In the communication device in this application, a power splitting circuit is added between a power amplifier and an antenna array of a base station antenna feed system. The power splitting circuit is configured to: when one of two power amplifiers is turned off, equally split one signal sent by the other power amplifier that is not turned off into two signal paths, so that an antenna element and a port of a feed network that correspond to the turned-off power amplifier can obtain the signal, thereby enabling a mobile device in a cell served by the antenna element corresponding to the turned-off power amplifier to maintain normal communication.

Abstract: An antenna system and a base station antenna feeder system are provided. The antenna system includes a first frequency band radiation element array, a frequency selective surface, a second frequency band radiation element, and a phase shifter. The frequency selective surface is configured to reflect a signal of the first frequency band radiation element array and to transmit a signal of the second frequency band radiation element array. The phase shifter is connected to the first frequency band radiation element array and is configured to feed the first frequency band radiation element array. The phase shifter includes a cavity which is disposed at an edge of the frequency selective surface, a first extension direction of the cavity being consistent with a second extension direction of the first frequency band radiation element array.

Abstract: The present invention discloses a key assembly with switchable sound and silent states: a swing arm is pivotally connected to a key shaft, which further has a power-storing member for cooperating with the swing arm to strike the key shaft and make a sound; By adjusting the position of the electric control swing rod of the electric switching unit, the present application changes the linkage relationship between the limit structure of the swing arm and the electric control swing rod of the electric switching unit to change the sound state of the key, thereby improving the flexibility and usability of devices, providing users with more usage scenarios, and meeting diverse needs of the users.

Abstract: This application provides an antenna system. The antenna system includes a first reflection panel, a first antenna array, and a second antenna array. The first antenna array and the second antenna array are stacked on the first reflection panel. The first antenna array and the second antenna array share the first reflection panel. The first antenna array and the second antenna array operate on different frequency bands.

Abstract: An anti-coking and stably operating apparatus for co-producing aviation fuel and chemical feedstock from waste biomass is provided. The apparatus includes a low-energy consumption second-scale biomass drying-coupled pyrolysis and fractionation conversion to bio-crude unit, a bio-crude suspended bed hydrodeoxygenation and upgrading to low-oxygen bio-oil unit, and a low-oxygen bio-oil fixed-bed molecular reconstruction to hydrocarbon aviation fuel unit. By arranging a flash reaction thermal start-up mechanism capable of stepwise temperature rise for coking inhibition and online switching for decoking, the device rapidly crosses the coking reaction time point, transfers the coking position, and realizes spatiotemporal decoupling of coking risk and the long-term stable operation of the device for co-producing aviation fuel and chemical feedstock from waste biomass.

Abstract: A power adjustment network is provided, including: a first input end, a second input end, a first output end, a second output end, a first phase-shifting unit, and a first switching unit, where a first branch is formed by connecting the first input end and the first output end; a second branch is formed by connecting the first input end, the first phase-shifting unit, the first switching unit, and the second output end; and a third branch is formed by connecting the second input end, the first switching unit, and the second output end. When the first switching unit controls the second branch to be connected, the first power amplifier is operative. When the first switching unit controls the third branch to be connected, both the first power amplifier and the second power amplifier work.

Abstract: The present invention discloses a keyboard with a switchable keystroke sound. The keyboard comprises a switch-fixing plate and a plurality of key switches arranged on the switch-fixing plate. The key switches have sound-making structures for making keystroke sounds when pressed. A switching plate that is movable relative to the switch-fixing plate is arranged on a bottom portion of the switch-fixing plate. A plurality of structural members that are stretched into the key switches are configured on the switching plate. The keyboard of the present invention is artful in arranging the movable switching plate at the bottom portion of the keyboard, so as to determine whether the sound-making structures in the key switches can make keystroke sounds by changing the positions of the structural members that are located on the switching plate and stretched into the key switches.

Abstract: The present disclosure provides a communication method and apparatus. In an example, the communication method may include: transmitting a first radar transmit signal in a first frequency band by using a first transmit antenna array; receiving a first echo signal of the first radar transmit signal in the first frequency band by using a first receive antenna array, where the first echo signal includes an echo signal corresponding to at least one first terminal; and communicating with at least one second terminal in a second frequency band by using a second transmit antenna array and a second receive antenna array, where the first frequency band and the second frequency band do not overlap.

Abstract: This application provides a communication apparatus. The communication apparatus includes at least one transmit antenna unit, at least one receive antenna unit, and a signal processing unit. The signal processing unit is configured to: control the at least one transmit antenna unit and the at least one receive antenna unit to communicate with at least one first terminal on a first frequency band; control at least one target transmit antenna unit to send a radar signal on a second frequency band; and control at least one target receive antenna unit to receive a first echo signal on the second frequency band. The at least one transmit antenna unit includes the at least one target transmit antenna unit. The at least one receive antenna unit includes the at least one target receive antenna unit. The first frequency band and the second frequency band do not overlap.

Abstract: This application provides an antenna signal detection network and detection method, an antenna system, and a base station. The detection network includes two calibration channels and a switching network. A first calibration channel includes a plurality of first output ports, and phases of the plurality of first output ports are the same. A second calibration channel includes a plurality of second output ports, a quantity of the second output ports is the same as a quantity of the first output ports, phases of the plurality of second output ports are different from each other, and the plurality of first output ports and the second output ports are connected to antenna arrays. The switching network is connected to the two calibration channels. According to the antenna signal detection network provided in this application, correctness of a connection between an antenna array and the RRU can be quickly and conveniently detected.

Abstract: Embodiments of this application provide a method for detecting a connection relationship in a radio frequency channel in a base station antenna and calibrating a channel, including: receiving a sample from a calibration network, where the sample is a signal obtained by adding a phase identifier to a coupled signal of a radio frequency channel in a base station antenna through the calibration network, and the phase identifier is a phase value used to mark an antenna port connected to a radio remote unit RRU port on the radio frequency channel; and learning of, based on the phase identifier, an antenna port that is actually connected to the RRU port. In technical solutions provided in embodiments of this application, no component needs to be added, and no product size needs to be increased.

Abstract: The present disclosure relates to the field of communication technologies, and provides a method for synchronizing a master device and a slave device in time and an optical relay system. The method includes: obtaining a first link length value and a second link length value by using measurement optical signals; obtaining a link length difference between a first transmission link and a second transmission link based on a difference between the first link length value and the second link length value by using a difference calculation algorithm for asymmetric optical fibers in a sending link and a receiving link; and compensating for a time deviation between the master device and the slave device based on the link length difference.

Abstract: This application describes multi-band antenna systems and base stations. An example antenna system a frequency selective surface (FSS); at least one radiating element array on a first side of the FSS; and at least one feeding network corresponding to the at least one radiating element array, wherein the at least one feeding network corresponding to the at least one radiating element array is connected to the FSS according to a direct current connection manner or a segmented direct current connection manner, or the at least one feeding network corresponding to the at least one radiating element array is integrated on the FSS.

Abstract: A rapid-click switch includes a button switch, at least one triggering component, an active reset mechanism, and a control module. When the button switch is pressed, the at least one triggering component is switched on and then deactivated to trigger the control module, and the control module controls the active reset mechanism to drive the button switch to rapidly return to an initial position before being pressed.

Abstract: A housing and a foldable electronic device are provided. The housing includes a middle plate, the middle plate includes a first middle plate and a second middle plate that are connected to each other, and materials of the first middle plate and the second middle plate are different. The first middle plate and the second middle plate are mated with each other to form a hinge accommodating region and a non-hinge accommodating region on the middle plate, at least a portion of the first middle plate forms at least a portion of the non-hinge accommodating region, and at least a portion of the second middle plate forms at least a portion of the hinge accommodating region. The middle plate of the housing provided in this application uses a split-type structure and uses different materials, thereby maintaining stable chemical performance when implementing reduction of a body weight.

Abstract: Disclosed in the present invention is a short-range optical potentiometer module, comprising a potential base body provided with a key slot, and a potential key which is mounted inside the key slot and can be displaced up and down, wherein a reset member for resetting the potential key is also arranged inside the key slot, an optical pair transistor composed of a photosensitive element and a light-emitting element is arranged inside the potential key, the optical pair transistor can be displaced up and down along with the potential key, a key base is internally provided with a fixed grating corresponding to the optical pair transistor, the reset member is sleeved on the grating, and the grating is configured such that the flux of light received by the photosensitive element from the light-emitting element changes along with the up-and-down displacement of the potential key, thereby causing an electrical signal generated by the photosensitive element to change along with the displacement of the potential key.

Abstract: An FSS unit includes a radiation assembly, a receiving assembly, and a transmission assembly that are stacked and spaced apart. There is space between the radiation assembly and the receiving assembly. A metal shielding member and a feed network component are located in the space, the metal shielding member is configured to shield at least one of the transmission assembly and the feed network component, and a cavity of the metal shielding member is configured to place the transmission assembly or the feed network component.