Abstract: Provided are a composite coating, a piston, an engine, and a vehicle. The composite coating comprises a metal bonding layer, a transition layer, a ceramic layer, and a sealing layer which are sequentially laminated, wherein the metal bonding layer is configured to be bonded with a piston basic body, the metal bonding layer is a rare earth metal modified bonding layer, and the transition layer is a rare earth metal modified zirconia layer.

Abstract: Embodiments of this application provide a pillar-shaped luneberg lens antenna and a pillar-shaped luneberg lens antenna array, and relate to the field of communications technologies, so that the pillar-shaped luneberg lens antenna can support dual polarization and improve a capacity of a communications system. The pillar-shaped luneberg lens antenna includes two metal plates that are parallel to each other and a pillar-shaped luneberg lens disposed between the two metal plates, the pillar-shaped luneberg lens includes a main layer and a compensation layer that are of the pillar-shaped luneberg lens, and the compensation layer is configured to compensate for equivalent dielectric constants of the main layer of the pillar-shaped luneberg lens in a TEM mode and/or a TE10 mode, so that distribution of equivalent dielectric constants of the pillar-shaped luneberg lens in the TEM mode and the TE10 mode is consistent with distribution of preset dielectric constants.

Abstract: The present disclosure relates to signal sending circuits, signal receiving circuits, electronic apparatus, and base stations. One example circuit includes a signal pre-processing sub-circuit, a digital-to-analog conversion sub-circuit, an intermediate frequency power splitter, K frequency conversion phase-shift sub-circuits, and K antenna elements. An output end of the signal pre-processing sub-circuit is connected to an input end of the digital-to-analog conversion sub-circuit, an output end of the digital-to-analog conversion sub-circuit is connected to an input end of the intermediate frequency power splitter, an output end of the intermediate frequency power splitter is connected to input ends of the K frequency conversion phase-shift sub-circuits, and output ends of the K frequency conversion phase-shift sub-circuits are connected one-to-one to input ends of the K antenna elements.

Abstract: This application discloses a dual-polarized antenna, a radio frequency front-end apparatus, and a communications device. The dual-polarized antenna is a planar antenna, and a maximum radiation direction of the dual-polarized antenna is parallel to an antenna plane. A radio frequency circuit may be disposed at a side opposite to the maximum radiation direction of the dual-polarized antenna and located on a same circuit board as the dual-polarized antenna. A low profile feature is implemented, and the radio frequency circuit and the dual-polarized antenna do not need to be connected by using an interconnection plug, thereby reducing an insertion loss and reducing an assembly difficulty.

Abstract: Embodiments of this application provide a pillar-shaped luneberg lens antenna and a pillar-shaped luneberg lens antenna array, and relate to the field of communications technologies, so that the pillar-shaped luneberg lens antenna can support dual polarization and improve a capacity of a communications system. The pillar-shaped luneberg lens antenna includes two metal plates that are parallel to each other and a pillar-shaped luneberg lens disposed between the two metal plates, the pillar-shaped luneberg lens includes a main layer and a compensation layer that are of the pillar-shaped luneberg lens, and the compensation layer is configured to compensate for equivalent dielectric constants of the main layer of the pillar-shaped luneberg lens in a TEM mode and/or a TE10 mode, so that distribution of equivalent dielectric constants of the pillar-shaped luneberg lens in the TEM mode and the TE10 mode is consistent with distribution of preset dielectric constants.

Abstract: This application discloses a dual-polarized antenna, a radio frequency front-end apparatus, and a communications device. The dual-polarized antenna is a planar antenna, and a maximum radiation direction of the dual-polarized antenna is parallel to an antenna plane. A radio frequency circuit may be disposed at a side opposite to the maximum radiation direction of the dual-polarized antenna and located on a same circuit board as the dual-polarized antenna. A low profile feature is implemented, and the radio frequency circuit and the dual-polarized antenna do not need to be connected by using an interconnection plug, thereby reducing an insertion loss and reducing an assembly difficulty.

Abstract: The present application discloses a signal processing apparatus and method, the method includes: receive an analog signal; adjust a frequency band of the analog signal to a lowest frequency band when a frequency band of the analog signal received by the receiving unit falls outside the lowest frequency band in multiple preconfigured frequency bands; process, by using a signal processing channel in the lowest frequency band, the analog signal whose frequency band has been adjusted to the lowest frequency band. The method provided in the embodiments of the present application processes signals of different frequency bands by using a processing channel in a lowest frequency band. In this way, only a relatively small quantity of radio-frequency link components are required to implement processing of the signals of the different frequency bands, which reduces a link size of a communications system.

Abstract: The present application discloses a signal processing apparatus and method, the method includes: receive an analog signal; adjust a frequency band of the analog signal to a lowest frequency band when a frequency band of the analog signal received by the receiving unit falls outside the lowest frequency band in multiple preconfigured frequency bands; process, by using a signal processing channel in the lowest frequency band, the analog signal whose frequency band has been adjusted to the lowest frequency band. The method provided in the embodiments of the present application processes signals of different frequency bands by using a processing channel in a lowest frequency band. In this way, only a relatively small quantity of radio-frequency link components are required to implement processing of the signals of the different frequency bands, which reduces a link size of a communications system.

Abstract: The present application discloses a signal processing apparatus and method, the method includes: receive an analog signal; adjust a frequency band of the analog signal to a lowest frequency band when a frequency band of the analog signal received by the receiving unit falls outside the lowest frequency band in multiple preconfigured frequency bands; process, by using a signal processing channel in the lowest frequency band, the analog signal whose frequency band has been adjusted to the lowest frequency band. The method provided in the embodiments of the present application processes signals of different frequency bands by using a processing channel in a lowest frequency band. In this way, only a relatively small quantity of radio-frequency link components are required to implement processing of the signals of the different frequency bands, which reduces a link size of a communications system.

Abstract: A planar-transmission-line-to-waveguide adapter is provided, to reduce limitations on bandwidth expansion. The planar-transmission-line-to-waveguide adapter includes a planar transmission line structure includes at least a planar transmission line, a dielectric substrate, and a metal ground having a coupling gap. a gradient waveguide structure includes m dielectric waveguides with gradient sizes, and any dielectric waveguide is surrounded by metal via holes in a dielectric substrate, where m is a positive integer not less than 2. a1st dielectric waveguide in the m dielectric waveguides with gradient sizes is coupled with the coupling gap in the planar transmission line structure. Adjacent dielectric waveguides are connected by using a metal ground, and a radiation patch is disposed between the adjacent dielectric waveguides. A metal ground and a radiation patch are disposed on a surface on which an mth dielectric waveguide comes into contact with a standard waveguide.

Abstract: Embodiments of the present disclosure provide a base station and a beam coverage method, which can improve a service capacity of a communications system. The base station includes: an antenna and at least two data transmission paths, where a data converter and a beamformer are disposed on each data transmission path; the antenna includes a beam aggregation structure and at least one antenna bay, the beam aggregation structure includes at least one antenna aperture, one beamformer is correspondingly connected to one antenna bay, one antenna bay uses at least one antenna aperture in the beam aggregation structure to receive and send a beam, and a multiplexer is further disposed on the at least two data transmission paths; and the multiplexer is configured to set a data transmission path of a to-be-transmitted signal or a radiation signal. The embodiments of the present disclosure are used for beam coverage.

Abstract: The present application discloses a signal processing apparatus and method, the method includes: receive an analog signal; adjust a frequency band of the analog signal to a lowest frequency band when a frequency band of the analog signal received by the receiving unit falls outside the lowest frequency band in multiple preconfigured frequency bands; process, by using a signal processing channel in the lowest frequency band, the analog signal whose frequency band has been adjusted to the lowest frequency band. The method provided in the embodiments of the present application processes signals of different frequency bands by using a processing channel in a lowest frequency band. In this way, only a relatively small quantity of radio-frequency link components are required to implement processing of the signals of the different frequency bands, which reduces a link size of a communications system.

Abstract: Embodiments of the present disclosure provide a base station and a beam coverage method, which can improve a service capacity of a communications system. The base station includes: an antenna and at least two data transmission paths, where a data converter and a beamformer are disposed on each data transmission path; the antenna includes a beam aggregation structure and at least one antenna bay, the beam aggregation structure includes at least one antenna aperture, one beamformer is correspondingly connected to one antenna bay, one antenna bay uses at least one antenna aperture in the beam aggregation structure to receive and send a beam, and a multiplexer is further disposed on the at least two data transmission paths; and the multiplexer is configured to set a data transmission path of a to-be-transmitted signal or a radiation signal. The embodiments of the present disclosure are used for beam coverage.

Abstract: A planar-transmission-line-to-waveguide adapter is provided, to reduce limitations on bandwidth expansion. The planar-transmission-line-to-waveguide adapter includes a planar transmission line structure includes at least a planar transmission line, a dielectric substrate, and a metal ground having a coupling gap. a gradient waveguide structure includes m dielectric waveguides with gradient sizes, and any dielectric waveguide is surrounded by metal via holes in a dielectric substrate, where m is a positive integer not less than 2. a1st dielectric waveguide in the m dielectric waveguides with gradient sizes is coupled with the coupling gap in the planar transmission line structure. Adjacent dielectric waveguides are connected by using a metal ground, and a radiation patch is disposed between the adjacent dielectric waveguides. A metal ground and a radiation patch are disposed on a surface on which an mth dielectric waveguide comes into contact with a standard waveguide.