Abstract: This application discloses an antenna, an antenna array, and a communications device. The antenna includes a radiation part and a feeding part. The feeding part is coupled to the radiation part and is configured to feed power to the radiation part, so that the radiation part radiates a low-frequency signal outward. The radiation part includes one or more frequency selection units with a bandpass characteristic, and the radiation part is a structure that is capable of exciting, when a high-frequency signal passes through, coupling currents. When the high-frequency signal passes through the radiation part, each pair of coupling currents excited on the radiation part appear in pairs and can cancel each other. This can reduce or even completely eliminate a high-frequency induced current with the same frequency as the high-frequency signal on the radiation part.

Abstract: Embodiments of this application disclose a common aperture antenna and a communication device. The common aperture antenna includes: a reflection panel and a low frequency antenna unit, a frequency selective panel, and a high frequency antenna unit that are disposed on the same side as the reflection panel and are arranged in sequence. In the direction perpendicular to the reflection panel, the distance between the high frequency antenna unit and the reflection panel is greater than the distance between the low frequency antenna unit and the reflection panel, the frequency selective panel is disposed between the high frequency antenna unit and the low frequency antenna unit, and the frequency selective panel is a reflection ground of the high frequency antenna unit and has a total reflection characteristic for the working frequency of the high frequency antenna unit.

Abstract: A multi-band antenna structure, including a first antenna element, a second antenna element, a reflection panel, and a first parasitic structure of the first antenna element. A distance between the reflection panel and an antenna element with a higher operating frequency band is less than a distance between the reflection panel and an antenna element with a lower operating frequency band. A distance between the first antenna element and the second antenna element is less than 0.5 times a vacuum wavelength corresponding to a lower frequency bands. A distance between the first antenna element and the first parasitic structure is less than 0.5 times a vacuum wavelength corresponding to an operating frequency band of the first antenna element. A distance between the second antenna element and the first parasitic structure is less than 0.5 times a vacuum wavelength corresponding to an operating frequency band of the second antenna element.

Abstract: Example multi-band antennas and communication devices are described. One example multi-band antenna includes a reflection plate and a feed structure. The reflection plate is provided with a slot, and the slot defines one strip conductor. One end of the strip conductor is connected to another part of the reflection plate. The feed structure includes a microstrip line used in a high-frequency antenna element in the multi-band antenna, where the microstrip line is located on one side of the reflection plate, and at least a part of a projection of the microstrip line on the reflection plate falls within a contour range of the strip conductor.

Abstract: Embodiments of this application disclose a common aperture antenna and a communication device. The common aperture antenna includes: a reflection panel and a low frequency antenna unit, a frequency selective panel, and a high frequency antenna unit that are disposed on the same side as the reflection panel and are arranged in sequence. In the direction perpendicular to the reflection panel, the distance between the high frequency antenna unit and the reflection panel is greater than the distance between the low frequency antenna unit and the reflection panel, the frequency selective panel is disposed between the high frequency antenna unit and the low frequency antenna unit, and the frequency selective panel is a reflection ground of the high frequency antenna unit and has a total reflection characteristic for the working frequency of the high frequency antenna unit.

Abstract: This application discloses an antenna, an antenna array, and a communications device. The antenna includes a radiation part and a feeding part. The feeding part is coupled to the radiation part and is configured to feed power to the radiation part, so that the radiation part radiates a low-frequency signal outward. The radiation part includes one or more frequency selection units with a bandpass characteristic, and the radiation part is a structure that is capable of exciting, when a high-frequency signal passes through, coupling currents. When the high-frequency signal passes through the radiation part, each pair of coupling currents excited on the radiation part appear in pairs and can cancel each other. This can reduce or even completely eliminate a high-frequency induced current with the same frequency as the high-frequency signal on the radiation part.

Abstract: A multi-band antenna structure, including a first antenna element, a second antenna element, a reflection panel, and a first parasitic structure of the first antenna element. A distance between the reflection panel and an antenna element with a higher operating frequency band is less than a distance between the reflection panel and an antenna element with a lower operating frequency band. A distance between the first antenna element and the second antenna element is less than 0.5 times a vacuum wavelength corresponding to a lower frequency bands. A distance between the first antenna element and the first parasitic structure is less than 0.5 times a vacuum wavelength corresponding to an operating frequency band of the first antenna element. A distance between the second antenna element and the first parasitic structure is less than 0.5 times a vacuum wavelength corresponding to an operating frequency band of the second antenna element.

Abstract: An antenna and a communications device are presented. The antenna includes a radiating patch configured to transmit and receive a radio frequency signal; a radiating patch reference ground, disposed opposite the radiating patch; a first transmission line configured to transmit the radio frequency signal; a transmission line reference ground, disposed opposite the first transmission line; a first connection portion, connected to the first transmission line, and disposed opposite the radiating patch reference ground; and a first feed portion, including a first transmission line feed portion and two first radiation feed portions, where the two first radiation feed portions are connected to the radiating patch and are configured to receive a radio frequency signal of the radiating patch or transfer a radio frequency signal to the radiating patch; the first transmission line feed portion is connected to the first transmission line using the first connection portion.

Abstract: An antenna and a communications device are presented. The antenna includes a radiating patch configured to transmit and receive a radio frequency signal; a radiating patch reference ground, disposed opposite the radiating patch; a first transmission line configured to transmit the radio frequency signal; a transmission line reference ground, disposed opposite the first transmission line; a first connection portion, connected to the first transmission line, and disposed opposite the radiating patch reference ground; and a first feed portion, including a first transmission line feed portion and two first radiation feed portions, where the two first radiation feed portions are connected to the radiating patch and are configured to receive a radio frequency signal of the radiating patch or transfer a radio frequency signal to the radiating patch; the first transmission line feed portion is connected to the first transmission line using the first connection portion.