EP-4742444-A1 - ANTENNA AND COMMUNICATION DEVICE

EP4742444A1EP 4742444 A1EP4742444 A1EP 4742444A1EP-4742444-A1

Abstract

This application relates to the field of communication technologies, and provides an antenna and a communication device, to resolve a problem of mutual coupling between radiators in the antenna. The antenna provided in this application includes a first radiation assembly and a second radiator. An operating frequency band of the first radiation assembly is greater than an operating frequency band of the second radiator. The first radiation assembly may include a first radiator and a first director. A resonant frequency of the first radiator is greater than or equal to 0.4F 0 and less than or equal to 0.6F 0 . The first director is located in a radiation direction of the first radiator and coupled to the first radiator. A resonant frequency of the first director is greater than or equal to 0.4F L and less than or equal to 0.6F L . F 0 is a center frequency of the first radiation assembly, and F L is a minimum operating frequency of the first radiation assembly. In the antenna provided in this application, the minimum operating frequency of the first radiation assembly can be achieved by using the first director, so that adverse impact on operating performance of the second radiator caused by coupling between the first radiator and the second radiator can be effectively reduced.

Inventors

XUE, Chengdai
ZHANG, ZHIJIE
DU, Zijing
WANG, CAN
FAN, Yipeng

Assignees

Huawei Technologies Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20240726

Claims (14)

An antenna, comprising a first radiation assembly and a second radiator, wherein an operating frequency band of the first radiation assembly is greater than an operating frequency band of the second radiator, and the first radiation assembly comprises: a first radiator, wherein a resonant frequency of the first radiator is greater than or equal to 0.4F 0 and less than or equal to 0.6F 0 ; and a first director, located in a radiation direction of the first radiator and coupled to the first radiator, wherein a resonant frequency of the first director is greater than or equal to 0.4F L and less than or equal to 0.6F L , F 0 is a center frequency of the first radiation assembly, and F L is a minimum operating frequency of the first radiation assembly.
The antenna according to claim 1, wherein the first radiation assembly further comprises a second director, the second director is located in the radiation direction of the first radiator and coupled to the first radiator, a resonant frequency of the second director is greater than or equal to 0.4F H and less than or equal to 0.6F H , and F H is a maximum operating frequency of the first radiation assembly.
The antenna according to claim 1 or 2, wherein the first radiator has a radiation surface, an aperture of the radiation surface is greater than or equal to 0.25λ 0 *0.25λ 0 and less than or equal to 0.35λ 0 *0.35λ 0 , a height of the radiator in the radiation direction is less than or equal to 0.2λ L , λ 0 is a wavelength of an electromagnetic wave at the center operating frequency of the first radiation assembly when the electromagnetic wave propagates in free space, and λ L is a wavelength of an electromagnetic wave at the minimum operating frequency of the first radiation assembly when the electromagnetic wave propagates in free space.
The antenna according to claim 3, wherein the radiation surface has a vertical arm that extends perpendicular to the radiation surface, a length of the vertical arm is 0.05λ 0 , and λ 0 is the wavelength of the electromagnetic wave at the center operating frequency of the first radiation assembly when the electromagnetic wave propagates in free space.
The antenna according to any one of claims 1 to 4, wherein the first radiator has a first polarized radiation arm and a second polarized radiation arm that are orthogonally disposed; the first director has a slot, and the slot is provided corresponding to the first polarized radiation arm or the second polarized radiation arm; and a length of the slot is greater than or equal to 0.15λ H and less than or equal to 0.25λ H , and λ H is a wavelength of an electromagnetic wave at the maximum operating frequency of the first radiation assembly when the electromagnetic wave propagates in free space.
The antenna according to any one of claims 2 to 5, wherein the second director comprises a rectangular substrate and a plurality of rectangular sheets, the rectangular substrate has a first plate surface, the plurality of rectangular sheets are distributed on the first plate surface, and a ratio of a width to a length of the rectangular substrate is greater than or equal to 0.6 and less than 1.
The antenna according to claim 6, wherein a size of each of the rectangular sheets is 0.06λ 0 *0.045λ 0 , and λ 0 is the wavelength of the electromagnetic wave at the center operating frequency of the first radiation assembly when the electromagnetic wave propagates in free space.
The antenna according to claim 6 or 7, wherein the plurality of rectangular sheets are asymmetrically distributed on the first plate surface.
The antenna according to any one of claims 6 to 8, wherein the second director further has a plurality of decoupling strips, the plurality of decoupling strips are all located on the first plate surface and disposed along an edge of the first plate surface, and a ratio of a shortest decoupling strip to a longest decoupling strip among the plurality of decoupling strips is greater than or equal to 0.7 and less than 1.
The antenna according to claim 9, wherein the plurality of decoupling strips comprise a decoupling strip with a length of 0.2λ 0 and a decoupling strip with a length of 0.25λ 0 .
The antenna according to any one of claims 1 to 10, wherein the antenna further comprises a reflective plate and a balun structure, the reflective plate has a reflective surface and a back surface that is away from the reflective surface, the first radiation assembly and the second radiator are both located on the reflective surface, and the back surface of the reflective plate has a feeding cavity; the balun structure comprises a first feeding plate and a second feeding plate; the first feeding plate has a first segment and a second segment, and an included angle that is in a direction parallel to the reflective surface and that is between the first segment and the second segment is 45°; the second feeding plate has a third segment and a fourth segment, and an included angle that is in the direction parallel to the reflective surface and that is between the third segment and the fourth segment is 45°; the first segment and third segment are orthogonally disposed, and the second segment and the fourth segment are disposed in mirror symmetry; and both the first segment and the second segment are feed-connected to the first radiation assembly, and an end portion of the third segment and an end portion of the fourth segment extend into the feeding cavity.
The antenna according to claim 11, wherein the antenna further comprises a feeding network, and the feeding network is located in the feeding cavity; the feeding network has a first feeding probe and a second feeding probe; and the end portion of the third segment has a first arc-shaped arm, an outer arc surface of the first arc-shaped arm abuts against the first feeding probe, the end portion of the fourth end has a second arc-shaped arm, and an outer arc surface of the second arc-shaped arm abuts against the second feeding probe.
A communication device, comprising a radio frequency processing unit and the antenna according to any one of claims 1 to 12, wherein the radio frequency processing unit is connected to the feeding network in the antenna.
A system, comprising at least two communication devices, wherein the communication devices comprise the antennas according to any one of claims 1 to 12.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202311015408.1, filed with the China National Intellectual Property Administration on August 11, 2023 and entitled "ANTENNA AND COMMUNICATION DEVICE", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the field of communication technologies, and in particular, to an antenna and a communication device. BACKGROUND With rapid development of wireless communication technologies, the industry's demand for antenna-system capacity continuously rises. To increase a data transmission rate and a channel capacity of the antenna system, a growing number of radiators are arranged in an antenna. During actual application, a plurality of radiators are deployed densely in an antenna, and some of the radiators have distinct operating frequency bands, which can cause inter-band interference between radiators. For example, high-frequency antennas are coupled to low-frequency antennas. This coupling degrades signal transmission performance and coverage capabilities of the antenna. Therefore, how to reduce interference between radiators becomes a technical problem to be urgently resolved. SUMMARY This application provides an antenna and a communication device that have good operating performance. According to a first aspect, this application provides an antenna. The antenna may include a first radiation assembly and a second radiator. An operating frequency band of the first radiation assembly is greater than an operating frequency band of the second radiator. The first radiation assembly may include a first radiator and a first director. A resonant frequency of the first radiator is greater than or equal to 0.4F0 and less than or equal to 0.6F0. The first director is located in a radiation direction of the first radiator and coupled to the first radiator. A resonant frequency of the first director is greater than or equal to 0.4FL and less than or equal to 0.6FL. F0 is a center frequency of the first radiation assembly, and FL is a minimum operating frequency of the first radiation assembly. In the antenna provided in this application, the minimum operating frequency of the first radiation assembly can be achieved by using the first director, so that adverse impact on operating performance of the second radiator caused by coupling between the first radiator and the second radiator can be effectively reduced. In an example, the first radiation assembly may further include a second director. The second director is located in the radiation direction of the first radiator and coupled to the first radiator. A resonant frequency of the second director is greater than or equal to 0.4FH and less than or equal to 0.6FH. FH is a maximum operating frequency of the first radiation assembly. The second director is disposed, so that the maximum operating frequency of the first radiation assembly can be achieved, to help increase bandwidth of the first radiation assembly. In a specific configuration, the first radiator has a radiation surface, and an aperture of the radiation surface may be greater than or equal to 0.25λ0*0.25λ0 and less than or equal to 0.35λ0*0.35λ0. In addition, a height of the radiator in the radiation direction may be less than or equal to 0.2XL. λ0 is a wavelength of an electromagnetic wave at the center operating frequency of the first radiation assembly when the electromagnetic wave propagates in free space, and λL is a wavelength of an electromagnetic wave at the minimum operating frequency of the first radiation assembly when the electromagnetic wave propagates in free space. The resonant frequency of the first radiator can be near the center frequency of the first radiation assembly by using the foregoing structure configuration, so that radiation performance of the first radiation assembly can be ensured. In a specific configuration, the radiation surface may have a vertical arm that extends perpendicular to the radiation surface, and a length of the vertical arm is 0.05λ0. λ0 is the wavelength of the electromagnetic wave at the center operating frequency of the first radiation assembly when the electromagnetic wave propagates in free space. The vertical arm is disposed, so that the aperture of the radiation surface can be further reduced, and a size of the first radiator in a direction parallel to the radiation surface can be reduced, to arrange more first radiators in the antenna. In an example, the first radiator may have a first polarized radiation arm and a second polarized radiation arm that are orthogonally disposed. The first director may have a slot, and the slot is provided corresponding to the first polarized radiation arm or the second polarized radiation arm. A length of the slot is greater than or equal to 0.15λH and less than or equal to 0.25λH. λH is a wavelength of an electromagnetic wave at the maximum operating frequency of the first radi