Abstract: This application provides a liquid crystal metasurface antenna apparatus and a communication apparatus. The liquid crystal metasurface antenna apparatus includes a liquid crystal metasurface reflection plate and a feed source, where the liquid crystal metasurface reflection plate includes a plurality of liquid crystal antenna units; the liquid crystal antenna unit at least includes a plurality of oscillators and two layers of dielectric plates; the plurality of oscillators are disposed between the two layers of dielectric plates; the plurality of oscillators include a horizontal oscillator pair and/or a vertical oscillator pair; and each oscillator includes a left arm, a right arm, and a capacitor, the left arm and the right arm are connected through the capacitor, and a liquid crystal material is filled in a space enclosed by the left arm, the right arm, and the capacitor.

Abstract: This application provides an antenna assembly, including two antenna boards that are placed in a stacked manner. Polarization manners of the two antenna boards are perpendicular to each other, and the two antenna boards are configured to separate a received electromagnetic wave into a horizontal polarization component and a vertical polarization component. A bias voltage is applied to a liquid crystal dielectric layer in the two antenna boards to change ratios of reflection power to transmission power of the two antenna boards, to change a ratio of reflection power of the two polarization components that are obtained through separation, and implement linear polarization at different angles after vector synthesis is performed on the two polarization components. In this way, receive power of an antenna is increased.

Abstract: An antenna includes a first helical arm and a second helical arm. The first helical arm is wound clockwise along a longitudinal direction of an axis of the antenna, and the second helical arm is wound counterclockwise along the longitudinal direction of the axis of the antenna. The second helical arm and the first helical arm form at least one intersecting point, a first feeding point is disposed on the first helical arm, a second feeding point is disposed on the second helical arm, the first feeding point and the second feeding point are two points symmetrical relative to the axis of the antenna, and any intersecting point of the at least one intersecting point further forms a third feeding point, where the first feeding point and the second feeding point are connected to a first feeding port, and the third feeding point is connected to a second feeding port.

Abstract: An antenna includes a first helical arm and a second helical arm. The first helical arm is wound clockwise along a longitudinal direction of an axis of the antenna, and the second helical arm is wound counterclockwise along the longitudinal direction of the axis of the antenna. The second helical arm and the first helical arm form at least one intersecting point, a first feeding point is disposed on the first helical arm, a second feeding point is disposed on the second helical arm, the first feeding point and the second feeding point are two points symmetrical relative to the axis of the antenna, and any intersecting point of the at least one intersecting point further forms a third feeding point, where the first feeding point and the second feeding point are connected to a first feeding port, and the third feeding point is connected to a second feeding port.

Abstract: A filter unit and a filter are disclosed. The filter unit includes two stacked cavities. Each cavity includes a dielectric substrate, and two surfaces of the dielectric substrate are each provided with a metal covering layer. Connected coupling slots and a row of metal slots parallel to the coupling slots are etched on a metal covering layer. One end of a coupling slot is an open end, and the other end is a closed end. The open end corresponds to a magnetic wall structure, and the closed end corresponds to an electric wall structure. The two cavities are coupled and connected by using the coupling slots.

Abstract: A filter unit and a filter are disclosed. The filter unit includes two stacked cavities. Each cavity includes a dielectric substrate, and two surfaces of the dielectric substrate are each provided with a metal covering layer. Connected coupling slots and a row of metal slots parallel to the coupling slots are etched on a metal covering layer. One end of a coupling slot is an open end, and the other end is a closed end. The open end corresponds to a magnetic wall structure, and the closed end corresponds to an electric wall structure. The two cavities are coupled and connected by using the coupling slots.

Abstract: An embodiment of the present invention discloses a waveguide filter, which includes a first waveguide at an upper layer and a second waveguide at a lower layer. The first waveguide and the second waveguide are isolated from each other by a metal isolation layer. The first waveguide forms a first resonant cavity. The second waveguide forms a second resonant cavity. The first resonant cavity and the second resonant cavity overlap each other. A coupling slot is disposed at the metal isolation layer in an overlapping area.

Abstract: An embodiment of the present invention discloses a waveguide filter, which includes a first waveguide at an upper layer and a second waveguide at a lower layer. The first waveguide and the second waveguide are isolated from each other by a metal isolation layer. The first waveguide forms a first resonant cavity. The second waveguide forms a second resonant cavity. The first resonant cavity and the second resonant cavity overlap each other. A coupling slot is disposed at the metal isolation layer in an overlapping area.