Abstract: This application provides a communication method, apparatus, and system. A network device sends a first downlink signal to a terminal device through a downlink slot of a first band, and simultaneously, the network device receives a first uplink signal from the terminal device through an uplink slot of a second band, where there is an association relationship between an uplink-downlink slot configuration of the first band and an uplink-downlink slot configuration of the second band.

Abstract: A tightly coupled array antenna and a network device are provided. The tightly coupled array antenna includes a first dielectric slab and a plurality of antenna units printed on a lower surface of the first dielectric slab. Each of the antenna units includes a plurality of dipole antennas that are disposed at intervals. Oscillator arms of the dipole antennas are partially hollowed out to reduce both capacitance formed between the oscillator arms and the first dielectric slab and the cross-sectional area of a current path. A plurality of coupling structures is provided on an upper surface of the first dielectric slab so that each of the antenna units is electrically connected to one coupling structure.

Abstract: This application provides a radiating element, an antenna array, and a network device, to avoid mutual shielding between dipoles during multi-band transmission, and therefore improve radiation performance. The radiating element includes one or more dipoles and a supporter. The one or more dipoles are suspended on the top of the supporter, and each of the one or more dipoles is connected to the supporter at a specific angle. A dipole arm of each dipole is covered with a periodic structure. The periodic structure is configured to enable an electromagnetic wave radiated to a first surface of each dipole to be incident to a second surface of each dipole, where the first surface and the second surface are any two opposite surfaces of each dipole.

Abstract: This application provides an antenna module and a base station system. The antenna module may transmit an electromagnetic wave of a specific frequency band. The base station system includes: a signal tower, a first antenna module, and a second antenna module. The first antenna module and the second antenna module are separately fixed at the signal tower, and share a same antenna installation platform on the signal tower; a distance between a center point of the first antenna module and the signal tower is less than a distance between a center point of the second antenna module and the signal tower. The solutions in this application can enable the base station system to implement multi-band coverage. The antenna module in the system can operate independently without affecting each other, and can be mounted and disassembled separately.

Abstract: A first circuit includes at least one bridge, where input ends of the at least one bridge are coupled to digital channels in N analog networks, to perform digital weighting and analog on a received electrical signal; a second circuit includes at least one bridge, where output ends of the at least one bridge are coupled to M antennas, to perform digital weighting and analog on a received electrical signal; and a connection circuit includes at least one power splitter.

Abstract: An antenna and an antenna system that has the antenna, and relates to the field of wireless communication technologies. The antenna can allow a high frequency to pass through and block a low frequency or allow the low frequency to pass through and block the high frequency, and can be used in combination with other antennas to form an antenna system. In addition, in the antenna system, the antenna can also share a same antenna aperture surface with other antennas. The antenna can reduce costs while meeting a working requirement of a multi-band antenna, and can be used for flexible and changeable usage scenarios.

Abstract: Embodiments of this application disclose a radio frequency unit, an antenna, and a signal processing method. The method includes: receiving an uplink signal in a downlink slot, where the uplink signal includes signals of N frequency bands; filtering and amplifying the signals of the N frequency bands; converting the uplink signal into a digital intermediate frequency signal; and then processing the digital intermediate frequency signal.

Abstract: This application provides a downlink transmitting system and a switching method. The downlink transmitting system includes at least one digital intermediate frequency module group, at least one Tx port group, a plurality of PAs, at least one switching switch, and an antenna array. The plurality of PAs are connected to the antenna array. The plurality of PAs are connected to all Tx ports included in the downlink transmitting system in a one-to-one correspondence. The at least one digital intermediate frequency module group is in a one-to-one correspondence with the at least one Tx port group. Each Tx port group is connected to each digital intermediate frequency module in a corresponding digital intermediate frequency module group through one switching switch. Each Tx port group includes a plurality of Tx ports.

Abstract: This application provides a multi-band shared-aperture antenna. The multi-band shared-aperture antenna includes a first antenna array, a second antenna array, and a reflection panel, where the first antenna array includes four first dielectric plates perpendicular, two adjacent first dielectric plates are perpendicular to each other, the first antenna array includes four hollowed butterfly dipole units, the dipole unit includes two radiation arms, the two radiation arms are respectively printed on two adjacent first dielectric plates, the radiation arm includes a first part and a second part, a first feeding stub is disposed on the first dielectric plate, the second part has a specified width in a direction perpendicular to the reflection panel, the second antenna array includes a plurality of second dielectric plates, four ring-shaped coils are disposed on any one of the second dielectric plates, and the ring-shaped coil is connected to a second feeding stub.

Abstract: An antenna system, a feeding network reconfiguration method, and an apparatus is disclosed. The antenna system may include an antenna array, a reconfigurable network unit, a control unit, and K radio frequency channels. The antenna array may include L antenna subarrays, and the reconfigurable network unit may divide the L antenna subarrays into M antenna subarray groups, and separately connect the M antenna subarray groups to the K radio frequency channels; any one of the K radio frequency channels may perform signal processing on a signal received by a connected antenna subarray group and/or a to-be-transmitted signal; and the control unit may control the reconfigurable network unit to adjust a mapping relationship between an antenna subarray group connected to each radio frequency channel and the antenna subarrays.

Abstract: A beamforming method and apparatus are provided. A beamforming apparatus according to one embodiment comprises a beamforming module comprising a beam port configured to provide electrical signals; an antenna array comprising a plurality of antenna ports; and a feeding network disposed between and coupling the beam port and the antenna ports. The feeding network is configured to shunt the electrical signals provided by the beam port to the plurality of antenna ports, the electrical signals received at the antenna ports being used to control shapes of beams formed by the antenna array. An amplitude of an electrical signal shunted to an antenna port and an operating frequency of the antenna array meet a first correspondence. A phase difference between electrical signals shunted to two different antenna ports and the operating frequency meet a second correspondence.

Abstract: This application provides a radiating element, an antenna array, and a network device, to avoid mutual shielding between dipoles during multi-band transmission, and therefore improve radiation performance. The radiating element includes one or more dipoles and a supporter. The one or more dipoles are suspended on the top of the supporter, and each of the one or more dipoles is connected to the supporter at a specific angle. A dipole arm of each dipole is covered with a periodic structure. The periodic structure is configured to enable an electromagnetic wave radiated to a first surface of each dipole to be incident to a second surface of each dipole, where the first surface and the second surface are any two opposite surfaces of each dipole.

Abstract: An antenna system, a feeding network reconfiguration method, and an apparatus is disclosed. The antenna system may include an antenna array, a reconfigurable network unit, a control unit, and K radio frequency channels. The antenna array may include L antenna subarrays, and the reconfigurable network unit may divide the L antenna subarrays into M antenna subarray groups, and separately connect the M antenna subarray groups to the K radio frequency channels; any one of the K radio frequency channels may perform signal processing on a signal received by a connected antenna subarray group and/or a to-be-transmitted signal; and the control unit may control the reconfigurable network unit to adjust a mapping relationship between an antenna subarray group connected to each radio frequency channel and the antenna subarrays.

Abstract: Embodiments of the present invention provide a beam forming network, including: a first 180-degree bridge for equal-power division, a 180-degree bridge for unequal-power division, a 90-degree phase shifter, and a second 180-degree bridge for equal-power division. A coupling port of a sum input port of the first 180-degree bridge for equal-power division is connected to a difference input port of the 180-degree bridge for unequal-power division, a straight-through port of the sum input port of the first 180-degree bridge for equal-power division is connected to an input port of the 90-degree phase shifter, an output port of the 90-degree phase shifter is connected to a difference input port of the second 180-degree bridge for equal-power division, and a straight-through port of a sum input port of the 180-degree bridge for unequal-power division is connected to a sum input port of the second 180-degree bridge for equal-power division.

Abstract: Embodiments of the present invention provide a beam forming network, including: a first 180-degree bridge for equal-power division, a 180-degree bridge for unequal-power division, a 90-degree phase shifter, and a second 180-degree bridge for equal-power division. A coupling port of a sum input port of the first 180-degree bridge for equal-power division is connected to a difference input port of the 180-degree bridge for unequal-power division, a straight-through port of the sum input port of the first 180-degree bridge for equal-power division is connected to an input port of the 90-degree phase shifter, an output port of the 90-degree phase shifter is connected to a difference input port of the second 180-degree bridge for equal-power division, and a straight-through port of a sum input port of the 180-degree bridge for unequal-power division is connected to a sum input port of the second 180-degree bridge for equal-power division.

Abstract: A method and apparatus are disclosed for automatic optimization of Doppler imaging parameters. The method includes obtaining and storing at least two characteristic spectral lines at a predetermined pulse repetition frequency. The method further includes optimizing at least one of the Doppler imaging parameters based on the stored at least two characteristic spectral lines and a predetermined mean noise power. In one embodiment, the characteristic spectral lines are obtained by collecting in real time the Doppler spectral lines generated at the predetermined pulse repetition frequency within a predetermined time period, and processing the collected Doppler spectral lines in real time without storing them.

Abstract: A method and apparatus are disclosed for automatic optimization of Doppler imaging parameters. The method includes obtaining and storing at least two characteristic spectral lines at a predetermined pulse repetition frequency. The method further includes optimizing at least one of the Doppler imaging parameters based on the stored at least two characteristic spectral lines and a predetermined mean noise power. In one embodiment, the characteristic spectral lines are obtained by collecting in real time the Doppler spectral lines generated at the predetermined pulse repetition frequency within a predetermined time period, and processing the collected Doppler spectral lines in real time without storing them.

Abstract: A method and apparatus are disclosed for automatic optimization of Doppler imaging parameters. The method includes obtaining and storing at least two characteristic spectral lines at a predetermined pulse repetition frequency. The method further includes optimizing at least one of the Doppler imaging parameters based on the stored at least two characteristic spectral lines and a predetermined mean noise power. In one embodiment, the characteristic spectral lines are obtained by collecting in real time the Doppler spectral lines generated at the predetermined pulse repetition frequency within a predetermined time period, and processing the collected Doppler spectral lines in real time without storing them.

Abstract: A method and apparatus are disclosed for automatic optimization of Doppler imaging parameters. The method includes obtaining and storing at least two characteristic spectral lines at a predetermined pulse repetition frequency. The method further includes optimizing at least one of the Doppler imaging parameters based on the stored at least two characteristic spectral lines and a predetermined mean noise power. In one embodiment, the characteristic spectral lines are obtained by collecting in real time the Doppler spectral lines generated at the predetermined pulse repetition frequency within a predetermined time period, and processing the collected Doppler spectral lines in real time without storing them.