Antenna assembly and communication device

Abstract

Embodiments of this application disclose an antenna assembly and a communication device. The antenna assembly includes a first antenna and a second antenna. The first antenna is formed on at least one first surface. A direction perpendicular to the first surface is a first direction. The first antenna includes a feed element, a power division element, and a radiation element. The power division element is connected between the feed element and the radiation element. The radiation element surrounds the power division element and the feed element. The radiation element includes a plurality of subelements that are spaced from each other, a gap is formed between adjacent subelements, and the gap passes through the first surface in the first direction. The second antenna is disposed at a position of the gap. A part of the second antenna is located on a top side of the first antenna, and a part of the second antenna is located on a bottom side of the first antenna. In this application, the first antenna and the second antenna are integrally designed, to design a multi-Wi-Fi antenna solution in compact space, and implement both a low directivity coefficient and high isolation.

Description

[0001] This application claims priority to Chinese Patent Application No. 202211180248.1, filed with the China National Intellectual Property Administration on September 27, 2022, and entitled "ANTENNA ASSEMBLY AND COMMUNICATION DEVICE", which is incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] The present invention relates to the field of radio frequency communication technologies, and in particular, to an antenna assembly and a communication device.BACKGROUND

[0003] With development of wireless communication specifications and increasing diversity of application scenarios, terminal products have an increasingly strong requirement for smart antenna beams. Taking CPE (Customer Premises Equipment, customer premise equipment) as an example, a CPE product is a device that shares, in a home in a form of a Wi-Fi (Wireless Fidelity, wireless network communication technology) signal, broadband signals received from wireless networks with various terminal products for Internet access, and is mainly configured to resolve a user Internet access problem. Therefore, communication effect perceived by a user depends on Wi-Fi performance of the CPE product. In the CPE product, an appropriate layout of Wi-Fi antennas is used to implement better horizontal coverage. With development of smart terminal devices, there is an increasing quantity of antennas in the CPE product. As a quantity of antennas in same space increases, mutual impact between the antennas becomes more serious. How to ensure that radiation of each antenna is not affected by another surrounding antenna is a difficulty in current research.

[0004] It can be learned from the foregoing that, a design of a multi-Wi-Fi antenna solution in compact space can implement both a low directivity coefficient and high isolation, and has very high application opportunities and great significance.SUMMARY

[0005] Embodiments of the present invention provide an antenna assembly and a communication device, to design a multi-Wi-Fi antenna solution in compact space, and implement both a low directivity coefficient and high isolation.

[0006] According to a first aspect, an embodiment of the present invention provides an antenna assembly, including a first antenna, a second antenna, a first feed port, and a second feed port. The first antenna is formed on at least one first surface. A direction perpendicular to the first surface is a first direction. The first antenna includes a feed element, a power division element, and a radiation element. The power division element is connected between the feed element and the radiation element. The radiation element surrounds the power division element and the feed element. The radiation element includes a plurality of subelements that are spaced from each other, a gap is formed between adjacent subelements, and the gap passes through the first surface in the first direction. The first feed port is connected to the feed element, and configured to feed to the first antenna. The second antenna is disposed at a position of the gap. A part of the second antenna is located on a top side of the first antenna in the first direction, and a part of the second antenna is located on a bottom side of the first antenna in the first direction. The second feed port is configured to feed to the second antenna.

[0007] In this application, the second antenna is disposed at the position of the gap of the first antenna, the second antenna and the first antenna are cross-arranged, and the second antenna passes through the gap in the first direction. A part of the second antenna is located on the top side of the first antenna, and a part of the second antenna is located on the bottom side of the first antenna, to form shared space between the first antenna and the second antenna, that is, an intersection exists in space. This helps implement miniaturization of an overall size of the antenna assembly. This spatial arrangement architecture of the first antenna and the second antenna can ensure a low directivity system of a pattern of each antenna. In addition, the second antenna is disposed at the position of the gap, to meet an isolation requirement.

[0008] In a possible implementation, the first antenna has a radial direction and a circumferential direction, the radial direction is a direction that points from the feed element to the radiation element, the circumferential direction is an extension direction of a surrounding path formed by the radiation element, and a vertical projection of the second antenna on the first surface in the first direction is located within a range of the gap in the circumferential direction. In this solution, a specific position relationship between the second antenna and the gap is limited. The second antenna is disposed within the range of the gap in the circumferential direction of the first antenna, so that the second antenna does not affect radiation efficiency of the first antenna. This implements decoupling between antennas and meets an isolation requirement.

[0009] In a possible implementation, the first antenna is a dipole antenna, and the second antenna is a dipole antenna.

[0010] In a possible implementation, there are a plurality of second antennas, the second antenna and the gap are disposed in a one-to-one correspondence, there are a plurality of second feed ports, and the second feed port and the second antenna are disposed in a one-to-one correspondence.

[0011] In a possible implementation, the antenna assembly includes an additional stub, and the additional stub is connected between two adjacent second antennas, and is configured to implement decoupling between the two adjacent second antennas. In this solution, the plurality of second antennas are limited. In an architecture in which the plurality of second antennas and the first antenna are cross-arranged, an increase in the quantity of second antennas helps improve radiation efficiency of the antennas. The additional stub structure is introduced, to implement decoupling between the two second antennas. In a process of a current flowing to the second antenna 30, a current flowing from the additional stub counteracts an original coupling current, to improve isolation between the two second antennas. For example, in this solution, the isolation between the two second antennas is optimized to -13 dB, implementing decoupling between the two second antennas.

[0012] In a possible implementation, a distance between the second feed port and a connection position between the additional stub and the second antenna ranges from 0 mm to 3 mm. In this solution, the distance range between the second feed port and the connection position between the additional stub and the second antenna is limited. Within this range, decoupling efficiency of the additional stub between the adjacent second antennas can be ensured.

[0013] In a possible implementation, the additional stub includes a first additional stub section and a second additional stub section, the first additional stub section and the second additional stub section are separated by an additional stub gap, the first additional stub section is connected to one of the second antennas, and the second additional stub section is connected to another one of the second antennas. (In this solution, the additional stub gap is provided, to improve isolation, and help optimize decoupling efficiency between two second antennas.)

[0014] In a possible implementation, a size of the additional stub gap ranges from 0.1 mm to 2 mm. In this solution, a range of the size of the additional stub gap is limited, to help ensure decoupling efficiency between two second antennas.

[0015] In a possible implementation, the first antenna is rotationally symmetrically distributed on the first surface by using a first central axis as a center, an extension direction of the first central axis is the first direction, the radiation element of the first antenna includes a first radiation stub and a second radiation stub, the antenna assembly further includes a third antenna, a radiator of the third antenna is a third radiation stub, the third radiation stub is connected to the feed element of the first antenna, a distance between the first radiation stub and the first central axis is greater than a distance between the second radiation stub and the first central axis, a distance between the third radiation stub and the first central axis is less than the distance between the second radiation stub and the first central axis, the antenna assembly further includes a third feed port, and the third feed port feeds power to the third radiation stub. In this solution, the second antenna, the third antenna, and the first antenna are vertically placed in space, to implement high-isolation tri-band Wi-Fi 4*4 MIMO coverage. In this application, the solution adds a 6E frequency band when maintaining a spatial size design range of the dual-band antenna (for example, 2.4 GHz and 5 GHz) solution. This implements an architecture in which more antennas are arranged in limited space, and facilitates overall structural compactness of the antenna assembly.

[0016] In a possible implementation, the antenna assembly includes one first dielectric plate and a plurality of second dielectric plates, the first radiation stub and the second radiation stub are disposed on the first dielectric plate, the third radiation stub and one of the second antennas are disposed on one of the second dielectric plates, another one of the second antennas is disposed on another one of the second dielectric plates in a one-to-one correspondence, and the first dielectric plate and the second dielectric plate are disposed at an included angle. In this solution, the third radiation stub of the third antenna and one of the second antennas are limited to being disposed on a same plate, facilitating space compactness. In this solution, an arrangement architecture in which another first electric dipole antenna is separately disposed on the another one of the second dielectric plates is limited, to implement a specific antenna arrangement solution. The first dielectric plate and the second dielectric plate are used as substrates that bear the antennas, and are combined to form an integrated antenna assembly. This facilitates a modular design of the antenna assembly, and facilitates assembly and layout of the antenna assembly in an electronic device.

[0017] In a possible implementation, one of the second dielectric plates includes a main body part and a corner part, the main body part is configured to dispose the second antenna, the corner part is configured to dispose the third radiation stub, the corner part is connected to a corner position of the main body part, the corner part is provided with a cutting slot, the first dielectric plate includes a central region, the feed element of the first antenna is disposed in the central region, and distributed on both a top surface and a bottom surface of the central region, and a part of the central region is inserted into the cutting slot, so that a part of the third radiation stub is in contact with a part of the feed element on the top surface of the central region. In this solution, a specific structure of the second dielectric plate on which the third antenna and the second antenna that are disposed on the same plate are located is limited. The cutting slot is used to implement a connection between the first dielectric plate and the second dielectric plate. In addition, at a position of the cutting slot, it can be ensured that a part of the third radiation stub is in contact with a part of the first antenna on the top surface of the central region. In this way, an overall structure of the antenna assembly is stable, and an electrical connection is reliable.

[0018] In a possible implementation, an operating frequency band of the first radiation stub includes 2.4 GHz to 2.5 GHz, an operating frequency band of the second radiation stub includes 5.15 GHz to 5.85 GHz, and an operating frequency band of the third radiation stub includes 5.925 GHz to 7.125 GHz.

[0019] In a possible implementation, each of the second antennas includes a first radiation part, a second radiation part, and a third radiation part that are disposed on a same plate, the first radiation part is located between the second radiation part and the third radiation part, a distance between the first radiation part and the second radiation part is less than a distance between the first radiation part and the third radiation part, the third radiation part is located between the first radiation part and the first central axis, a distance between the third radiation part and the first central axis is less than a distance between the third radiation part and the first radiation part, the second feed port feeds power to the first radiation part and the second radiation part, the antenna assembly further includes a fourth feed port, and the fourth feed port feeds power to the third radiation part.

[0020] In a possible implementation, an operating frequency band of the first radiation part includes 2.4 GHz to 2.5 GHz, an operating frequency band of the second radiation part includes 5.15 GHz to 5.85 GHz, and an operating frequency band of the third radiation part includes 5.925 GHz to 7.125 GHz.

[0021] In a possible implementation, the second antenna includes a feed stub, the fourth feed port and the second feed port are disposed on the feed stub, the first radiation part, the second radiation part, and the third radiation part are all symmetrically distributed on two sides of the feed stub, one end of the feed stub is connected to the third radiation part, and the other end of the feed stub is connected to the first radiation part and the third radiation part. In this solution, the antenna assembly provided in a specific implementation is limited to being an integrated multi-antenna structure. There are totally eight feed ports: three second feed ports, three fourth feed ports, one first feed port, and one third feed port. The radiation structures of the antenna are disposed on four dielectric plates: one first dielectric plate, and other three are second dielectric plates. Two feed ports are disposed on each dielectric plate. In this implementation, a solution of integrated multi-feed eight Wi-Fi antennas is implemented, to implement a low directivity coefficient in compact space. Feeding of the first feed port and the three second feed ports can both excite electromagnetic wave signals in two frequency bands (a first frequency band and a second frequency band). Feeding of the third feed port and the three fourth feed ports can excite electromagnetic wave signals in a third frequency band. Each antenna in the antenna assembly provided in this implementation meets omnidirectional horizontal coverage.

[0022] In a possible implementation, the first radiation part includes a first section and a second section, the first section and the second section are distributed on a same side of the feed stub, the second section and the feed stub are spaced from each other, two ends of the first section are respectively connected to the feed stub and the second section, and the first section and the second section are not collinear. In this solution, a specific arrangement architecture of the first radiation part is limited.

[0023] In a possible implementation, the second section is parallel to the feed stub, and an included angle between the first section and the feed stub is an acute angle. In this solution, a relationship between the second section and the feed stub of the first radiation part and a relationship between the first section and the feed stub are limited. This helps implement relatively small occupied space when ensuring performance of the second antenna.

[0024] In a possible implementation, the second antenna further includes an extension stub, one end of the extension stub is connected to the second section, the other end of the extension stub faces the second radiation part and forms a spacing slot with the second radiation part, the extension stub, the first section, and the second radiation part are sequentially connected and form surrounded space through surrounding, the spacing slot is an opening of the surrounded space, and the extension stub is configured to optimize a pattern of an electromagnetic wave beam generated by the second radiation part. In this solution, the extension stub is disposed, to optimize the pattern of the electromagnetic wave beam generated by the second radiation part, and help the second antenna have a low directional coefficient.

[0025] In a possible implementation, a grounding structure is disposed on the feed stub, and a distance between the grounding structure and the second feed port is greater than or equal to 7 mm and less than or equal to 8 mm. For example, in a specific implementation, the distance between the grounding structure and the second feed port is 7.5 mm. The distance between the grounding structure and the second feed port is a quarter of a dielectric wavelength of an operating frequency band of the first radiation part.

[0026] In a possible implementation, a distance between the grounding structure and the fourth feed port is greater than or equal to 3 mm and less than or equal to 4 mm. For example, in a specific implementation, the distance between the grounding structure and the fourth feed port is 3.5 mm. The distance between the grounding structure and the fourth feed port is a quarter of a dielectric wavelength of an operating frequency band of the third radiation part. In this solution, the grounding structure is disposed, and a position relationship between the grounding structure and the second feed port and a position relationship between the grounding structure and the fourth feed port are limited. This helps ensure that the first radiation part, the second radiation part, and the third radiation part of the second antenna operate within a required operating frequency band range, and helps improve radiation efficiency of each radiation part.

[0027] In a possible implementation, a part of the third radiation stub is located on a top surface of the first dielectric plate and is electrically connected to the first antenna, a part of the third radiation stub passes through the first dielectric plate from the gap and is located on a side of a bottom surface of the first dielectric plate, the antenna assembly further includes a decoupling stub, a part of the decoupling stub is electrically connected to the third radiation stub, the other part of the decoupling stub is located on a side of the bottom surface of the first dielectric plate and is electrically connected to the first antenna, and the decoupling stub is configured to improve isolation between the first antenna and the third radiation stub.

[0028] Specifically, the decoupling stub is configured to improve the isolation between the first antenna and the third radiation stub. In an implementation, the decoupling stub includes a first decoupling section and a second decoupling section. The first decoupling section is on the bottom side of the first antenna, and is in contact with the feed element of the first antenna. An extension direction of the first decoupling section may be the radial direction of the first antenna. The second decoupling section passes through the first antenna, and is connected between the first decoupling section and the third radiation stub. An extension direction of the second decoupling section may be the first direction, namely, the extension direction of the first central axis of the first antenna. When the first antenna is excited, a part of a current flows to a feed port of the third antenna, namely, a position of a fourth feed port. As a result, isolation between the first antenna and the third antenna is relatively poor. When the decoupling stub is disposed, the decoupling stub has a cancellation function for the currents flowing to the third antenna. An increase of the decoupling stub is equivalent to adding one current path. It can be learned from a comparison of current distribution diagrams that, after the decoupling stub is added, currents flowing from the first antenna to the third antenna are reduced significantly. This manner of improving the isolation has a wideband advantage, can optimize the isolation by more than 10 dB across entire 5 GHz to 7 GHz wideband, and overall isolation reaches -28 dB.

[0029] According to a second aspect, this application provides a communication device, including a circuit board and the antenna assembly according to any possible implementation of a first direction. A radio frequency circuit is disposed on the circuit board, and the first feed port and the second feed port are electrically connected to the radio frequency circuit.BRIEF DESCRIPTION OF DRAWINGS

[0030] To describe technical solutions in embodiments of the present invention or in the background more clearly, the following describes accompanying drawings for describing embodiments of the present invention or the background. FIG. 1 is a diagram of application of an electronic device including an antenna provided in this application as a home gateway in a home gateway system; FIG. 2 is a diagram of a specific application scenario of a communication device according to this application; FIG. 3 is a diagram of an internal structure of a communication device according to a specific implementation of this application, mainly showing a position relationship between an antenna assembly and a circuit board; FIG. 4 is a three-dimensional diagram of an antenna assembly in a direction according to a specific implementation of this application; FIG. 5 is a plane diagram of an antenna assembly in a direction (for example, a vertical direction) according to a specific implementation of this application; FIG. 6 is a plane diagram of an antenna assembly in another direction (for example, a horizontal direction) according to a specific implementation of this application; FIG. 7 is a plane diagram of a first dielectric plate and a first antenna disposed on the first dielectric plate in an antenna assembly according to a specific implementation of this application; FIG. 8A is a plane diagram of a second dielectric plate and a second antenna disposed on the second dielectric plate in an antenna assembly according to a specific implementation of this application; FIG. 8B is a diagram of a cross-sectional layered structure of a structure shown in FIG. 8A; FIG. 8C is a diagram of a cross-sectional layered structure of the second dielectric plate and the second antenna disposed on the second dielectric plate in the antenna assembly according to a specific implementation of this application; FIG. 9 is a diagram of an antenna assembly according to a specific implementation of this application; FIG. 10A is a pattern of a first antenna when an antenna assembly includes the separate first antenna according to a specific implementation of this application; FIG. 10B is a pattern of a second antenna when an antenna assembly includes four second antennas according to a specific implementation of this application; FIG. 10C is a pattern of a first antenna when an antenna assembly includes the first antenna and four second antennas according to a specific implementation of this application; FIG. 10D is a pattern of a second antenna when an antenna assembly includes a first antenna and four second antennas according to a specific implementation of this application; FIG. 11 is a three-dimensional diagram of an antenna assembly in a direction according to a specific implementation of this application; FIG. 12 is a three-dimensional diagram of an antenna assembly in another direction according to a specific implementation of this application; FIG. 13 is a plane diagram of an antenna assembly in a vertical direction according to a specific implementation of this application; FIG. 14 is a plane diagram of a front side of an antenna assembly in a horizontal direction according to a specific implementation of this application; FIG. 15 is a plane diagram of a back side of an antenna assembly in a horizontal direction according to a specific implementation of this application; FIG. 16 is a three-dimensional diagram of an antenna assembly in a direction according to a specific implementation of this application; FIG. 17 is a three-dimensional diagram of an antenna assembly in another direction according to a specific implementation of this application; FIG. 18 is a plane diagram of an antenna assembly in a vertical direction according to a specific implementation of this application; FIG. 19 is a plane diagram of a front side of an antenna assembly in a horizontal direction according to a specific implementation of this application; FIG. 20 is a plane diagram of a back side of an antenna assembly in a horizontal direction according to a specific implementation of this application; FIG. 21 is a three-dimensional diagram of an antenna assembly in a direction according to a specific implementation of this application; FIG. 22 is a three-dimensional diagram of an antenna assembly in another direction according to a specific implementation of this application; FIG. 23 is a plane diagram of a front side of an antenna assembly in a horizontal direction according to a specific implementation of this application; FIG. 24 is a plane diagram of a back side of an antenna assembly in a horizontal direction according to a specific implementation of this application; FIG. 25 is a plane diagram of an antenna assembly in a vertical direction according to a specific implementation of this application; FIG. 26 is a plane diagram of an antenna assembly in another vertical direction according to a specific implementation of this application; FIG. 27 is a diagram of a second antenna in an antenna assembly according to a specific implementation of this application; FIG. 28 is a side view of a feed stub of a second antenna in an antenna assembly according to a specific implementation of this application; FIG. 29 is a three-dimensional diagram of a position relationship between and specific structures of a first antenna and a third antenna in an antenna assembly in a direction according to a specific implementation of this application; FIG. 30 is a three-dimensional diagram of a position relationship between and specific structures of a first antenna and a third antenna in an antenna assembly in another direction according to a specific implementation of this application; FIG. 31 is a plane diagram of a position relationship between and specific structures of a first antenna and a third antenna in an antenna assembly according to a specific implementation of this application; A left diagram of FIG. 31A is a current distribution diagram of a third antenna on which no decoupling stub is disposed, and a right diagram of FIG. 31A is a current distribution diagram of the third antenna on which a decoupling stub is disposed; FIG. 31B is an isolation comparison diagram before and after adding of a decoupling stub; FIG. 32 is a diagram of a position relationship between and specific structures of two second antennas in an antenna assembly according to a specific implementation of this application; FIG. 32A, FIG. 32B, and FIG. 32C are respectively a current distribution diagram in which no additional stub is disposed between two second antennas, a current distribution diagram in which an additional stub is disposed between the two second antennas (but there is no gap on the additional stub), and a current distribution diagram in which the additional stub is disposed between the two second antennas and there is an additional stub gap on the additional stub; FIG. 32D is an isolation comparison in states shown in FIG. 32A, FIG. 32B, and FIG. 32C; FIG. 33 is a plane diagram of a second dielectric plate, and a second antenna and a third antenna on the second dielectric plate in an antenna assembly in a direction according to a specific implementation of this application; FIG. 34 is a plane diagram of a second dielectric plate, and a second antenna and a third antenna on the second dielectric plate in an antenna assembly in another direction according to a specific implementation of this application; FIG. 35 is a plane diagram of a second dielectric plate, and a second antenna on the second dielectric plate in an antenna assembly in a direction according to a specific implementation of this application; FIG. 36 is a plane diagram of a second dielectric plate, and a second antenna on the second dielectric plate in an antenna assembly in another direction according to a specific implementation of this application; FIG. 37 is a diagram of a first dielectric plate and a first antenna on the first dielectric plate in an antenna assembly in a direction according to a specific implementation of this application; FIG. 38 is a three-dimensional diagram of an antenna assembly in a direction according to a specific implementation of this application; FIG. 39 is a three-dimensional diagram of an antenna assembly in another direction according to a specific implementation of this application; FIG. 40 is a plane diagram of an antenna assembly in a direction according to a specific implementation of this application; FIG. 41 is a plane diagram of an antenna assembly in another direction according to a specific implementation of this application; A left diagram of FIG. 42 shows that an antenna assembly includes only three second antennas, and a right diagram of FIG. 42 shows a 2.45 GHz current distribution diagram in an architecture including the only three second antennas; A left diagram of FIG. 43 shows that an antenna assembly includes three second antennas and one first antenna, and a right diagram of FIG. 43 shows a 2.45 GHz current distribution diagram when the first antenna is added on the basis of the three second antennas; FIG. 44 is an isolation curve diagram when one first antenna is added on the basis of three second antennas; FIG. 45 is an S parameter diagram of a tri-band antenna architecture including a second antenna in a working state in three frequency bands; FIG. 46 is a current distribution diagram of three second antennas in three frequency bands; FIG. 47 is a pattern of three second antennas in three frequency bands; FIG. 48 is an S parameter diagram of a tri-band antenna architecture including a first antenna and a third antenna in a working state in three frequency bands; FIG. 49 is a current distribution diagram of a first antenna in a first frequency band and a second frequency band, and a current distribution diagram of a third antenna in a third frequency band; and FIG. 50 is a pattern of a first antenna in a first frequency band and a second frequency band, and a pattern of a third antenna in a third frequency band. DESCRIPTION OF EMBODIMENTS Explanation of some terms

[0031] MIMO technologies: multiple-input multiple-output, in which a transmitter and a receiver respectively use a plurality of transmit antennas and a plurality of receive antennas, to transmit and receive signals by using the plurality of antennas at the transmitter and the receiver, to improve communication quality. In the MIMO technologies, space resources can be fully utilized, and multiple transmissions and receptions are implemented by using the plurality of antennas. A system channel capacity can be multiplied without increasing a spectrum resource and antenna transmit power. The MIMO technologies present a significant advantage and are considered as core technologies for next-generation mobile communication.

[0032] Wireless AP: an access point, namely, a wireless access point. In brief, the wireless AP is a wireless switch in a wireless network, and is an access point for a mobile terminal user to access a wired network. The wireless AP is widely used for network coverage in various scenarios, including enterprise-level customer scenarios such as education and healthcare. The wireless AP may be used for deployment of home broadband, an internal enterprise network, and the like, and a wireless coverage distance is tens of meters to 100-odd meters. A common wireless AP further has an access point client mode, that is, a wireless link may be established between APs, to expand a coverage area of a wireless network.

[0033] Home gateway: The home gateway is a network device located in a modern home. A function of the home gateway is to enable a home user to connect to the Internet, so that various smart devices located in the home can obtain an Internet service, or these smart devices communicate with each other. In brief, the home gateway is a bridge that connects the plurality of smart devices in the home to each other and connects an internal network in the home to an external network. From a technical perspective, the home gateway implements bridging / routing, protocol conversion, and address management and translation in the home and from the internal network to the external network, functions as a firewall, and provides possible services such as VoIP / Video over IP.

[0034] Parallelism: Parallelism defined in this application is not limited to absolute parallelism. A definition of the parallelism may be understood as basic parallelism, a non-absolute parallelism case caused by factors such as an assembly tolerance, a design tolerance, and a structural flatness is allowed, and an error within a small angle range is allowed. For example, a relationship within an assembly error range within 10 degrees may be understood as a parallel relationship.

[0035] Verticality: Verticality defined in this application is not limited to an absolute vertical intersection (an included angle is 90 degrees) relationship, a non-absolute vertical intersection relationship caused by factors such as an assembly tolerance, a design tolerance, and a structural flatness is allowed, and an error within a small angle range is allowed. For example, a relationship within an assembly error range of 80 degrees to 100 degrees may be understood as the vertical relationship.

[0036] Coupling: The coupling may be understood as direct coupling and / or indirect coupling, and a "coupling connection" may be understood as a direct coupling connection and / or an indirect coupling connection. The direct coupling may also be referred to as an "electrical connection", which may be understood as physical contact and electrical conductivity of components; or may be understood as a form in which different components in a line structure are connected by using a physical line that can transmit an electrical signal, like printed circuit board (printed circuit board, PCB) copper foil or a conducting wire. The "indirect coupling" may be understood as electrical conductivity of two conductors through space or a non-contact manner. In an embodiment, the indirect coupling may also be referred to as capacitive coupling. For example, signal transmission is implemented by forming an equivalent capacitor through coupling of a gap spaced between two conductive components. Connection: Two or more components are conducted or connected through "electrical connection" or "coupling connection" to perform signal / energy transmission, which may be referred to as connection.

[0037] Antenna pattern: The antenna pattern is also referred to as a radiation pattern. The antenna pattern means a pattern in which relative field strength (a normalized modulus value) of an antenna radiation field changes with a direction at a specific distance from an antenna. The antenna pattern is usually indicated by two plane patterns that are perpendicular to each other in a maximum radiation direction of the antenna.

[0038] Antenna return loss: The antenna return loss may be understood as a ratio of power of a signal reflected back to an antenna port through an antenna circuit to transmit power of the antenna port. A smaller reflected signal indicates a larger signal radiated by the antenna to space and higher radiation efficiency of the antenna. A larger reflected signal indicates a smaller signal radiated by the antenna to space and lower radiation efficiency of the antenna.

[0039] The antenna return loss may be indicated by an S11 parameter, and the S11 parameter is usually a negative number. A smaller S11 parameter indicates a smaller return loss of the antenna and higher radiation efficiency of the antenna. A larger S11 parameter indicates a larger return loss of the antenna and lower radiation efficiency of the antenna.

[0040] Isolation: The isolation means a ratio of a signal received by another antenna from a transmit antenna to a signal of the transmit antenna. The isolation is a physical quantity used to measure a degree of mutual coupling between antennas. Assuming two antennas form a two-port network, isolation between the two antennas is S21 and S12 between the antennas. The antenna isolation may be indicated by parameters S21 and S12. The parameters S21 and S12 are usually negative numbers. Smaller parameters S21 and S12 indicate higher isolation between the antennas and a lower degree of mutual coupling between the antennas. Larger parameters S21 and S12 indicate lower isolation between the antennas and a higher degree of mutual coupling between the antennas. The antenna isolation depends on an antenna radiation pattern, a spatial distance between antennas, an antenna gain, and the like.

[0041] Radiation efficiency: The radiation efficiency is a ratio of power radiated by an antenna to space (namely, power that is effectively converted into an electromagnetic wave) to active power input to the antenna. Active power input to an antenna = Input power of an antenna - Antenna loss. The antenna loss mainly includes a metallic ohmic loss and / or a dielectric loss.

[0042] Ground plane (reference ground): The ground plane may generally mean at least a part of any ground plane, grounding plate, ground metal plane, or the like in an electronic device (for example, a mobile phone), or at least a part of any combination of the any ground plane, grounding plate, ground component, or the like. The "ground / ground plane" may be configured to ground a component in the electronic device. In an embodiment, the "ground / ground plane" may include any one or more of the following: a ground plane of a circuit board of the electronic device, a grounding plate formed by a middle frame of the electronic device, a ground metal plane formed by a metal film below a display, a conductive ground plane of a battery, and a conductive member or a metal member that is electrically connected to the ground plane / grounding plate / metal plane. In an embodiment, the circuit board may be a printed circuit board (printed circuit board, PCB), for example, an 8-layer board, a 10-layer board, or a 12-layer board, a 13-layer board, or a 14-layer board respectively having 8, 10, 12, 13, or 14 layers of conductive materials, or a component that is separated and electrically insulated by a dielectric layer or an insulation layer, for example, glass fiber or polymer. In an embodiment, the circuit board includes a dielectric substrate, a ground plane, and a trace layer, where the trace layer and the ground plane are electrically connected through a via hole. In an embodiment, components such as a display 120, a touchscreen, an input button, a transmitter, a processor, a memory, a battery 140, a charging circuit, and a system on chip (system on chip, SoC) structure may be mounted on or connected to the circuit board, or electrically connected to the trace layer and / or the ground plane in the circuit board. For example, a radio frequency source is disposed at the trace layer.

[0043] Any one of the foregoing ground plane, grounding plate, or ground metal plane is made of conductive materials. In an embodiment, the conductive material may be any one of the following materials: copper, aluminum, stainless steel, brass and alloys thereof, copper foil on insulation laminates, aluminum foil on insulation laminates, gold foil on insulation laminates, silver-plated copper, silver-plated copper foil on insulation laminates, silver foil on insulation laminates and tin-plated copper, cloth impregnated with graphite powder, graphite-coated laminates, copper-plated laminates, brass-plated laminates, and aluminum-plated laminates. A person skilled in the art may understand that the ground plane / grounding plate / ground metal plane may alternatively be made of other conductive materials.

[0044] Operating frequency band: Any type of antenna always operates within a specific frequency range (frequency band width). For example, an operating frequency band of an antenna supporting a B40 frequency band includes a frequency ranging from 2300 MHz to 2400 MHz. In other words, the operating frequency band of the antenna includes the B40 frequency band. A frequency range that meets a specification requirement can be considered as the operating frequency band of the antenna.

[0045] Gain: The gain represents a degree to which an antenna intensively radiates input power. Usually, a narrower main lobe of the antenna pattern indicates a smaller minor lobe, and a higher antenna gain.

[0046] Dipole (dipole) antenna: The dipole antenna is an antenna formed by using two conductors placed opposite to each other as radiators and feeding power at each of two ends that are of the conductors and that are close to each other. A common dipole antenna includes two coaxial straight conductors. It should be understood that, in some embodiments, the two conductors forming the dipole antenna radiators may be non-coaxial, or non-coplanar, but have a specific offset. In some embodiments, the two conductors forming the dipole antenna radiators may not be in a straight line shape, for example, may be in an arc shape or a bent shape. The dipole antenna includes an electric dipole (electric dipole) antenna and a magnetic dipole (magnetic dipole) antenna. An electric dipole is two equal and opposite charges that are separated by a distance. A magnetic dipole is a closed loop of current, for example, a coil with a constant current. The magnetic dipole antenna is a physical model established by analogy with the electric dipole, and a current of the magnetic dipole antenna may be equivalent to a closed loop of current. For example, a radiation element of the magnetic dipole antenna is distributed in a ring shape, a feed element of the magnetic dipole antenna is located in a middle position of a region surrounded by the radiation element, and a current is distributed between the feed element and the radiation element by using a power division element.

[0047] The terms "first" and "second" are merely intended for a purpose of description, and shall not be understood as an indication or implication of relative importance or an implicit indication of a quantity of indicated technical features. Therefore, a feature limited by "first", "second", or the like may explicitly or implicitly include one or more features.

[0048] The following describes examples of solutions of this application by using embodiments.

[0049] An antenna assembly and a communication device that are provided in this application may be used in a WLAN system. The communication device may be a home gateway, for example, a router, a wireless AP (Access Point, wireless access point), or CPE (Customer Premises Equipment, customer premises equipment).

[0050] FIG. 1 shows an example in which a communication device including an antenna assembly provided in this application is used as a home gateway. In an implementation shown in FIG. 1, the communication device provided in this application is the home gateway. The home gateway is connected between an optical line terminal and a terminal device. The optical line terminal is connected to a wide area network (the Internet). The optical line terminal obtains a signal from the wide area network (the Internet), and transmits the signal to the home gateway. Then, an antenna disposed in the home gateway transmits the signal to each terminal device. The home gateway includes a digital module, a radio frequency module, and the antenna. The digital module is connected between the optical line terminal and the radio frequency module. The radio frequency module is configured to send a radio frequency signal to the antenna. With development of home intelligence, various smart terminal devices are configured in a home, and more antennas need to be configured in the home gateway, to provide signals for the various terminal devices. For example, the antenna may include an antenna 1, an antenna 2, an antenna 3, an antenna 4, and an antenna 5. The antenna 1 may be a low-frequency antenna. For example, the low-frequency antenna may be a 2 GHz antenna or a 3 GHz antenna. The antenna 2, the antenna 3, the antenna 4, and the antenna 5 may be high-frequency antennas. For example, the high-frequency antenna may be a 5 GHz antenna or a 6 GHz antenna. In another implementation, the antenna may have another configuration. For example, there may be at least two or three low-frequency antennas, and there may be one or two or more high-frequency antennas.

[0051] In an implementation, the terminal device may include a smartphone, a smart home (for example, an air conditioner, an electric fan, a washing machine, or a refrigerator), a smart television, and intelligent security (for example, a camera). The smartphone may be used within a low frequency range, or a high frequency range. For example, the smartphone may support signals of two frequencies: 2 GHz and 5 GHz. Therefore, as shown in FIG. 1, both the antenna 1 and the antenna 2 provide signals for the smartphone. The antenna 3 provides a signal for the smart home. For the smart home, a user may view and control statuses of a remote smart appliance, a remote lighting system, a remote power supply system, and the like by using a mobile phone, a PC, or the like based on a smart home gateway system platform. The antenna 4 provides a signal for the smart television, and the user may also remotely control the smart television by using the terminal device. The smart television may have functions of a web television and a video conference. The antenna 5 provides a signal for the intelligent security, and an intelligent security system may include functions of fire prevention, theft prevention, leakage prevention, and remote monitoring. The user can use the mobile phone or the Internet to remotely view and configure a home security protection system. In addition, the user can remotely monitor a home status. If an abnormal condition is detected, the security protection system can notify the user by making a call, sending an SMS message, sending an email, or the like.

[0052] In a specific application scenario, the antenna assembly in the communication device provided in this application needs to implement relatively good horizontal full coverage. FIG. 2 is a diagram of a communication device according to an implementation. The communication device 100 includes a housing 1001. The housing 1001 may be in a barrel shape, or another shape, for example, a square box shape or a round box shape. In this implementation, a top cover 1002 is disposed on a top of the barrel-shaped housing 1001. The top cover 1002 is made of a non-shielding material, for example, plastic. An antenna assembly is disposed inside the top cover 1002. A plurality of through holes 1003 are provided in the top cover 1002. The through holes 1003 are disposed to facilitate signal radiation of the antenna assembly in the communication device 100 and ventilation and heat dissipation inside the communication device 100.

[0053] FIG. 3 is a diagram of an internal structure of a communication device according to a specific implementation of this application, mainly showing a position relationship between an antenna assembly and a circuit board. Refer to FIG. 3. In an implementation, the antenna assembly 10 is disposed inside a housing 1001 of the communication device 100, a circuit board is disposed inside the housing 1001 of the communication device 100, and the antenna assembly 10 is located in top space of the circuit board. Specifically, the antenna assembly 10 is located between a top edge of the circuit board and a top cover 1002 of the housing 1001. A radio frequency circuit 1005 is disposed on the circuit board. The radio frequency circuit 1005 is configured to electrically connect to the antenna assembly 10, and may feed to the antenna assembly 10. The antenna assembly 10 includes a first antenna 20 and a second antenna 30. In an implementation, the first antenna 20 is horizontally placed, and the second antenna 30 is vertically placed. In this application, the first antenna 20 spatially intersects with the second antenna 30. To be specific, a part of the second antenna 30 is located between the first antenna 20 and the top edge of the circuit board, and a part of the second antenna 30 is located between the first antenna 20 and the top cover 1002. This implements an architecture in which a plurality of antennas are arranged in compact space, facilitates a small-size design of the communication device 100, and can still ensure radiation performance of each antenna in the antenna assembly 10.

[0054] The antenna assembly provided in a specific implementation of this application is an architecture that integrates a plurality of antennas. Each antenna needs to have a low directivity coefficient, and relatively high isolation needs to be provided between antennas, so that the plurality of antennas can be arranged in compact space, and the low directivity coefficient and the high isolation can be implemented.

[0055] FIG. 4, FIG. 5, and FIG. 6 are diagrams of position relationships between a first antenna and a second antenna of an antenna assembly according to an implementation of this application. FIG. 4 is a three-dimensional diagram of an antenna assembly 10 in a direction. FIG. 5 is a plane diagram of an antenna assembly 10 in a direction (for example, a vertical direction). FIG. 6 is a plane diagram of an antenna assembly 10 in another direction (for example, a horizontal direction). Refer to FIG. 4, FIG. 5, and FIG. 6. The antenna assembly 10 includes one first antenna 20 and four second antennas 30. In another implementation, there may be one, two, three, or more second antennas 30.

[0056] In an implementation, the first antenna 20 is formed on at least one first surface S1. Refer to FIG. 5. In an implementation, the first antenna 20 is formed on two first surfaces S1, and the two first surfaces S1 may be parallel to each other. In FIG. 5, the two first surfaces S1 are indicated by dashed lines. In an actual product, the first surfaces S1 may be two surfaces of a dielectric plate or two surfaces of another dielectric body. When there is one first surface S1 and the first surface S1 is in a planar shape (which means that an extension direction of the first surface S1 is approximately in a planar shape, not an absolute plane, and local concave-convex deformation or a microstructure characteristic caused by factors such as a manufacturing process tolerance is allowed), a direction perpendicular to the first surface S1 is a first direction A1. The first surface S1 may alternatively be a non-planar surface, for example, an arc-shaped surface or a surface in a bent form. For a non-planar first surface, a direction perpendicular to a central region of the first surface S1 is a first direction A1. For an arc-shaped first surface S1, a normal direction of the first surface S1 may be equivalent to a direction perpendicular to the first surface S1, namely, the first direction A1. When there are two or more first surfaces S1, a direction in which the first surfaces S1 are stacked is the first direction A1. In implementations shown in FIG. 4 and FIG. 5, there are two first surfaces S1, and the two first surfaces S1 are planes that are parallel to each other.

[0057] In an implementation, both the first antenna 20 and the second antenna 30 are dipole antennas.

[0058] The first antenna 20 is a magnetic dipole antenna, and the second antenna 30 is an electric dipole antenna. Both the first antenna 20 and the second antenna 30 can implement omnidirectional horizontal coverage of an electromagnetic wave.

[0059] In an implementation, the first antenna 20 is a rotationally symmetric structure with a first central axis X1 as a center. In FIG. 4, a dashed line that passes through the first antenna 20 schematically represents the first central axis X1. An extension direction of the first central axis X1 is the first direction A1, that is, the first central axis X1 is perpendicular to the first surface S1. In another implementation, the first antenna 20 may alternatively be a non-rotationally symmetric structure. As shown in FIG. 6, a radiator of the first antenna 20 is distributed in an annular region R, and a center of the annular region R is located on the first central axis X1. An area between two dashed circles in FIG. 6 is schematically represented as the annular region R. The annular region R is not limited to a circular region, and may alternatively be an annular region with a square contour or an annular region with a polygon contour.

[0060] Specifically, as shown in FIG. 4, the first antenna 20 includes a feed element 21, a power division element 22, and a radiation element 23. The power division element 22 is connected between the feed element 21 and the radiation element 23. The feed element 21 is configured to dispose a first feed port P1, or the feed element 21 may be the first feed port P1. The first feed port P1 is configured to electrically connect to a radio frequency cable. The radio frequency cable is configured to transmit a signal on a radio frequency chip to the first antenna 20. In the accompanying drawing of the specification provided in this application, a black solid circle is used to schematically represent a feed port, and does not represent a specific structural form and a specific position of the feed port. The power division element 22 is configured to transmit a signal to the radiation element 23. A detailed structure of each part of the first antenna 20 is described below.

[0061] The feed element 21 is located in a central region of the first antenna 20. In an implementation, an extended form of the feed element 21 on the first surface S1 is any form like a circle, a square, or a polygon, and a central position of the feed element 21 may be located on the first central axis X1. In an implementation, the feed element 21 includes two parts: a first feed patch 211 located on one first surface S1, and a second feed patch 212 located on the other first surface S1. The first feed patch 211 and the second feed patch 212 may be parallel to each other, and are disposed opposite to each other in the first direction A1. Structural forms and sizes of the first feed patch 211 and the second feed patch 212 may be the same or different. In an implementation, a feed architecture at the first feed port P1 is: An outer conductor of the radio frequency cable is electrically connected to one of the first feed patch 211 and the second feed patch 212, and an inner conductor of the radio frequency cable is electrically connected to the other one of the first feed patch 211 and the second feed patch 212, to transmit a signal in the radio frequency cable to the first antenna 20.

[0062] The radiation element 23 is located in a peripheral region of the feed element 21 and the power division element 22. The radiation element 23 surrounds the power division element 22 and the feed element 21. The radiation element 23 is distributed in the annular region R, where the annular region R surrounds the power division element 22 and the feed element 21. The radiation element 23 may include a plurality of subelements 231 that are spaced from each other, and a gap 24 is formed between adjacent subelements 231 (the second antenna 30 is disposed in the gap 24). The first antenna 20 has a radial direction and a circumferential direction, the radial direction is a direction that points from the feed element 21 to the radiation element 23, the circumferential direction is an extension direction of a surrounding path formed by the radiation element 23, and a vertical projection of the second antenna 30 on the first surface in the first direction is located within a range of the gap 24 in the circumferential direction. In this solution, a specific position relationship between the second antenna 30 and the gap 24 is limited. The second antenna 30 is disposed within the range of the gap in the circumferential direction of the first antenna 20, so that the second antenna 30 does not affect radiation efficiency of the first antenna 20. This implements decoupling between antennas and meets an isolation requirement.

[0063] Each subelement 231 includes two subelement stubs 2311 and 2312. In an implementation, one subelement stub 2311 is located on one first surface S1, and the other subelement stub 2312 is located on the other first surface S1. In an implementation, the two subelement stubs 2311 and 2312 in each subelement 231 are in a splicing relationship (or a partially overlapping relationship or a lapping relationship) in the circumferential direction. In the implementation shown in FIG. 4, four subelements 231 are formed in the radiation element 23. Subelement stubs 2311 and 2312 each are in an arc shape. Alternatively, the subelement stubs 2311 and 2312 may be in any form like a straight line shape or a sawtooth shape. Specific forms and sizes of the subelement stubs 2311 and 2312 are not limited in this application.

[0064] The power division element 22 also includes two parts: a first power division group 221 located on one first surface S1, and a second power division group 222 located on the other first surface S1. The first power division group 221 and the second power division group 222 may be parallel to each other, and are disposed opposite to each other in the first direction A1. Structural forms and sizes of the first power division group 221 and the second power division group 222 may be the same or different. In the implementation shown in FIG. 4, the first power division group 221 includes four first power division stubs 2212, one end of each of the four first power division stubs 2212 is connected to the first feed patch 211 of the feed element 21, and the other end of each of the four first power division stubs 2212 is connected to a subelement stub 2311 that is of the radiation element 23 and that is disposed on one first surface S1. Each first power division stub 2212 may be in a straight line shape, a curve shape, or another extended form. The second power division group 222 includes four second power division stubs 2222, and a connection relationship between the four second power division stubs 2222 and each of the feed element 21 and the radiation element 23 is the same as that between the first power division stub 2212 in the first power division group 221 and each of the feed element 21 and the radiation element 23.

[0065] In a specific implementation of this application, the gap 24 is formed in the first antenna 20, and the gap 24 passes through the first surface S1 in the first direction A1. In the specific implementation, the gap 24 is formed between adjacent subelements 231 of the radiation element 23. There may be a plurality of gaps 24, and the gaps are distributed at a spacing in the circumferential direction with the first central axis X1 as a center. In the implementation shown in FIG. 4, the antenna assembly 10 has four gaps 24. In another implementation, there may be one, two, three, or more gaps 24.

[0066] As shown in FIG. 6, the diagram provided in FIG. 6 may be understood as a distribution diagram of the antenna assembly 10 on one first surface S1. In this implementation, a vertical projection of the second antenna 30 on the first surface S1 is located inside the gap 24. As shown in FIG. 4 and FIG. 5, for each second antenna 30 of the four second antennas 30, a partial region of the second antenna 30 is located on a top side of the first antenna 20, and a partial region of the second antenna 30 is located on a bottom side of the first antenna 20. In an implementation, each second antenna 30 includes two radiation branch sections 31, and the two radiation branch sections 31 are spaced from each other on a same plane, that is, the second antenna 30 is of a coplanar structure. Two radiation branch sections 31 of one second antenna 30 may be designed with a same structural form and size. A spacing region between the two radiation branch sections 31 is used to dispose a second feed port P2, or a spacing between the two radiation branch sections 31 forms the second feed port P2. The second feed port P2 is used to electrically connect to the radio frequency cable. Specifically, the outer conductor of the radio frequency cable is electrically connected to one of the two radiation branch sections 31, and the inner conductor of the radio frequency cable is electrically connected to the other one of the two radiation branch sections 31.

[0067] In an implementation, both the two radiation branch sections 31 of the second antenna 30 may be of an L-shaped microstrip structure, the second feed port P2 between the two radiation branch sections 31 may be disposed in the gap 24 formed by the first antenna 20, and the second feed port P2 between the two radiation branch sections 31 may alternatively be disposed on a side of the first antenna 20, for example, disposed on a bottom side.

[0068] FIG. 7, FIG. 8A, FIG. 8B, FIG. 8C, and FIG. 9 are diagrams of specific implementations of the antenna assembly 10 disposed on a dielectric plate (which may be understood as an insulation support of the antenna assembly) according to the implementation shown in FIG. 4. It may be understood that the dielectric plate is a carrier for bearing the first antenna 20 and the second antenna 30, and the dielectric plate is further configured to mount the antenna assembly 10 inside a housing of a communication device. This application is not limited to a case in which the dielectric plate provided in the specific embodiment is used as the insulation support of the antenna assembly 10. The insulation support of the antenna assembly 10 may alternatively be another dielectric base, for example, a dielectric block structure or a dielectric cylindrical structure.

[0069] With reference to FIG. 4 and FIG. 7, in an implementation, the first antenna 20 is disposed on the first dielectric plate 40, and the first antenna 20 is distributed on a top surface and a bottom surface of the first dielectric plate 40. Specifically, the first feed patch 211 of the feed element 21 of the first antenna 20 is located on the top surface of the first dielectric plate 40, and the second feed patch 212 of the feed element 21 of the first antenna 20 is located on the bottom surface of the first dielectric plate 40. The first power division group 221 of the power division element 22 is located on the top surface of the first dielectric plate 40, and the second power division group 222 of the power division element 22 is located on the bottom surface of the first dielectric plate 40. In FIG. 7, only the first feed patch 211 and the first power division group 221 can be seen. The second feed patch 212 and the second power division group 222 are located on the bottom surface of the first dielectric plate 40, and are respectively blocked by the first feed patch 211 and the first power division group 221. One subelement stub 2311 of each subelement 231 of the radiation element 23 of the first antenna 20 is located on the top surface, and the other subelement stub 2312 of each subelement 231 is located on the bottom surface. In FIG. 7, graphs indicated by dashed lines represent subelement stub 2312 located on the bottom surface, and graphs filled with cross-sectional lines represent the subelement stub 2311, the first feed patch 211, and the first power division group 221, and are parts disposed on the top surface.

[0070] As shown in FIG. 7, the first dielectric plate 40 is provided with a plurality of gaps 24, and the gaps 24 extend radially from an outer edge of the first dielectric plate 40 to a central position of the first dielectric plate 40. For example, in the implementation shown in FIG. 7, the first dielectric plate 40 is of a circular plate structure, the gap 24 is formed by cutting a part of a material on the first dielectric plate 40, an opening of the gap 24 is located at the outer edge of the first dielectric plate 40, and the gap 24 is in a straight line shape or a rectangular slot shape. A quantity of the gaps 24 and a quantity of subelements 231 of the radiation element 23 are in a one-to-one correspondence, and the gap 24 is formed between two adjacent subelements 231. A quantity of gaps 24 and a quantity of second antennas 30 are also in a one-to-one correspondence, and each gap 24 is used to mount one corresponding second antenna 30. In this application, a gap 24 disposed on the first dielectric plate 40 is used to form a gap that is of the first antenna 20 and that is used to dispose the second antenna 30. In the implementation shown in FIG. 7, the first dielectric plate 40 includes a central dielectric part 41 and a plurality of peripheral dielectric parts 42, and the plurality of peripheral dielectric parts 42 surround a periphery of the central dielectric part 41. The gap 24 includes an opening end 241 and a bottom end 242 that are disposed opposite to each other. The bottom end 242 is located between the opening end 241 and the feed element 21, and the central dielectric part 41 is located between the bottom end 242 and the feed element 21. It may be understood that the feed element 21 is located at a central position of the central dielectric part 41, and the central dielectric part 41 allows the first dielectric plate 40 to form an integrated structure. Adjacent peripheral dielectric parts 42 are separated by using a cutting slot. Each peripheral dielectric part 42 corresponds to one subelement 231 of one radiation element 23. A part of the power division element 22 is formed on the central dielectric part 41, and the other part of the power division element 22 is formed on the peripheral dielectric part 42.

[0071] Refer to FIG. 8A and FIG. 8B. In an implementation, the second antenna 30 is disposed on a second dielectric plate 50, and the second antenna 30 is distributed on a same surface of the second dielectric plate 50. The second dielectric plate 50 may be of a rectangular plate structure. The second antenna 30 is a microstrip architecture extending along an edge of the second dielectric plate 50. The second feed port P2 may be located at a central position of a long edge of the rectangular second dielectric plate 50. In another implementation, refer to FIG. 8C. The second antenna 30 may alternatively be distributed on different surfaces of the second dielectric plate 50. For example, one section of the two radiation branch sections 31 of the second antenna 30 is located on a top surface of the second dielectric plate 50, and the other section of the two radiation branch sections 31 of the second antenna 30 is located on a bottom of the second dielectric plate 50.

[0072] Refer to FIG. 9. That the second dielectric plate 50 is assembled in the gap 24 of the first dielectric plate 40 may also be understood as that the second dielectric plate 50 is disposed in the gap 24 formed by the first antenna 20. In an implementation of this application, a thickness of the second dielectric plate 50 is the same as or approximately the same as a width of the cutting slot in the first dielectric plate 40, and the second dielectric plate 50 is inserted into the gap 24 and assembled with the first dielectric plate 40 into an integrated architecture. In an implementation, the first dielectric plate 40 is perpendicular to the second dielectric plate 50. In an implementation shown in FIG. 9, there are four second dielectric plates 50, every two of the four second dielectric plates 50 are disposed opposite to each other in a radial direction of the first dielectric plate 40, and two oppositely disposed second dielectric plates 50 may be coplanar. It may also be understood that an included angle between two adjacent second dielectric plates 50 is 90 degrees by using the first central axis X1 of the first antenna 20 as the center. In the implementation shown in FIG. 9, the second dielectric plate 50 includes a front surface and a back surface that are disposed opposite to each other, and the second antenna 30 is located on the front surface of the second dielectric plate 50. In the two adjacent second dielectric plates 50, a front surface of one second dielectric plate 50 faces a back surface of the other second dielectric plate 50.

[0073] Refer to FIG. 10A, FIG. 10B, FIG. 10C, and FIG. 10D. FIG. 10A is a pattern of a first antenna when an antenna assembly includes the separate first antenna. FIG. 10B is a pattern of a second antenna when an antenna assembly includes four second antennas. FIG. 10C is a pattern of a first antenna when an antenna assembly includes the first antenna and four second antennas. FIG. 10D is a pattern of a second antenna when an antenna assembly includes a first antenna and four second antennas. It can be learned by comparing FIG. 10A and FIG. 10C that, in this application, the first antenna and the four second antennas are integrated, and an architecture in which a part of the second antenna is located on a top side of the first antenna, and a part of the second antenna is located on a bottom side of the first antenna. There is almost no impact on a pattern of the first antenna. This helps ensure fidelity of the pattern of the first antenna and implement a low directional coefficient of the first antenna. It can be learned by comparing FIG. 10B and FIG. 10D that, in this application, the first antenna and the four second antennas are integrated, and an architecture in which a part of the second antenna is located on a top side of the first antenna, and a part of the second antenna is located on a bottom side of the first antenna. There is almost no impact on a pattern of the second antenna either. This helps ensure fidelity of the pattern of the second antenna and implement a low directional coefficient of the second antenna.

[0074] FIG. 11 to FIG. 15 are diagrams of position relationships between a first antenna 20 and a second antenna 30 of an antenna assembly 10 according to an implementation of this application. FIG. 11 and FIG. 12 are respectively three-dimensional diagrams of the antenna assembly 10 in two directions. FIG. 13 is a plane diagram of the antenna assembly 10 in a direction (for example, a vertical direction). FIG. 14 and FIG. 15 are a top plane diagram and a bottom plane diagram of the antenna assembly 10 in another direction (for example, a horizontal direction). Refer to FIG. 11, FIG. 12, FIG. 13, FIG. 14, and FIG. 15. In this implementation, the antenna assembly 10 includes one first antenna 20 and three second antennas 30.

[0075] Some differences between the first antenna 20 provided in this implementation and the first antenna 20 provided in the implementation shown in FIG. 4 lie in that: A specific architecture of a power division element 22 is different, a quantity and distribution of subelements 231 of a radiation element 23 are different, and a quantity of gaps 24 formed by the first antenna 20 is different. Refer to FIG. 11, FIG. 12, FIG. 14, and FIG. 15. Each power division group (including a first power division group 221 and a second power division group 222) of the power division element 22 of the first antenna 20 has three power division stubs, and an included angle between two adjacent power division stubs in the three power division stubs is 120 degrees. Correspondingly, there are three subelements 231 of the radiation element 23, and a gap 24 is formed between two adjacent subelements 231 of the three subelements 231. Therefore, there are three gaps 24. There are three second antennas 30, and the three second antennas 30 are respectively located at positions of the three gaps 24 of the first antenna 20.

[0076] In this implementation, the antenna assembly 10 further includes an additional stub 60, where the additional stub 60 is connected between two adjacent second antennas 30, and is configured to implement decoupling between the two second antennas 30. A distance D1 between a second feed port P2 and a connection position between the additional stub 60 and the second antenna 30 ranges from 0 mm to 3 mm. In an implementation, as shown in FIG. 12, the distance D1 may be a distance between a center point of the second feed port P2 and a center point of the connection position between the additional stub 60 and the second antenna 30. Refer to FIG. 11 and FIG. 12. In an implementation, the additional stub 60 of the antenna assembly 10 includes a first additional stub section 61, a second additional stub section 62, and a third additional stub section 63 that are respectively connected to the three second antennas 30. The first additional stub section 61 is connected to a position of a second feed port P2 of a 1 st< second antenna 30 (or close to the second feed port). The second additional stub section 62 is connected to a position of a second feed port P2 of a 2 nd< second antenna 30 (or close to the second feed port), and the third additional stub section 63 is connected to a position of a second feed port P2 of a third second antenna 30 (or close to the second feed port). In an implementation, the first additional stub section 61, the second additional stub section 62, and the third additional stub section 63 are all in a straight line shape. In another implementation, the first additional stub section 61, the second additional stub section 62, and the third additional stub section 63 may alternatively be in any form like a curve shape or a bent line shape. This is not specifically limited in this application. The first additional stub section 61 and the second additional stub section 62 form an additional stub between the 1 st< second antenna 30 and the 2 nd< second antenna 30. The first additional stub section 61 and the second additional stub section 62 may be interconnected as a whole. In an implementation of this application, decoupling between two second antennas 30 may be implemented by interconnecting two additional stubs as a whole. Specifically, in a process of a current flowing to the second antenna 30, a current flowing from the additional stub 60 counteracts an original coupling current, to improve isolation between the two second antennas 30. For example, in this solution, the isolation between the two second antennas 30 is optimized to -13 dB, implementing decoupling between the two second antennas 30.

[0077] As shown in FIG. 13, the first additional stub section 61 and the second additional stub section 62 may alternatively be separated by using an additional stub gap 601. The second additional stub section 62 and the third additional stub section 63 may alternatively be separated by using an additional stub gap. The first additional stub section 61 and the third additional stub section 63 may alternatively be separated by using an additional stub gap. A size of the additional stub gap 601 ranges from 0.1 mm to 2 mm. In this solution, the additional stub gap is provided, which is equivalent to a function of serially connecting a capacitor between the first additional stub section 61 and the second additional stub section 62. Within an operating frequency band range of the second antenna 30, this solution can improve isolation. For example, in this solution, isolation between the two second antennas 30 can be optimized to more than -18 dB. Therefore, this solution helps improve decoupling efficiency between the two second antennas 30.

[0078] Refer to FIG. 11, FIG. 12, and FIG. 15. That a tail end that is of the first additional stub section and that is far away from the second antenna, a tail end that is of the second additional stub section and that is far away from the second antenna, and a tail end that is of the third additional stub section and that is far away from the second antenna are all opposite to the feed element 21 of the first antenna in a first direction may also be understood as follows: The end that is of the first additional stub section 61 and that is far away from the second antenna 30, the end that is of the second additional stub section 63 and that is far away from the second antenna 30, and the end that is of the third additional stub section 63 and that is far away from the second antenna are all located within a vertical projection range of the feed element 21 of the first antenna in the first direction A1. As shown in FIG. 14, the tail end that is of the first additional stub section 61 and that is far away from the second antenna 30, the tail end that is of the second additional stub section 62 and that is far away from the second antenna 30, and the tail end that is of the third additional stub section 63 and that is far away from the second antenna 30 are blocked by the feed element 21, as shown in FIG. 15. The tail end that is of the first additional stub section 61 and that is far away from the second antenna 30, the tail end that is of the second additional stub section 62 and that is far away from the second antenna 30, and the tail end that is of the third additional stub section 63 and that is far away from the second antenna 30 are located within an outer profile range of the feed element 21.

[0079] Refer to FIG. 13. An area of a part that is of the second antenna 30 and that is located on a top side of the first antenna 20 is less than an area of a part that is of the second antenna 30 and that is located on ta bottom side of the first antenna 20. In FIG. 13, space above the first antenna 20 is the top side of the first antenna 20, and space below the first antenna 20 is the bottom side of the first antenna 20. The additional stub 60 is located on the bottom side of the first antenna 20. The additional stub 60 and the first antenna 20 are spaced from each other to form spacing space. The spacing space is used as reserved avoidance space for assembling a radio frequency cable at the first feed port P1.

[0080] FIG. 16, FIG. 17, FIG. 18, FIG. 19, and FIG. 20 are diagrams of the antenna assembly disposed on a dielectric plate (which may be understood as an insulation support of the antenna assembly) according to the implementation shown in FIG. 11. It may be understood that the dielectric plate is a carrier for bearing the first antenna and the second antenna, and the dielectric plate is further configured to mount the antenna assembly inside a housing of a communication device. This application is not limited to a case in which the dielectric plate provided in the specific embodiment is used as the insulation support of the antenna assembly. The insulation support of the antenna assembly may alternatively be another dielectric base, for example, a dielectric block structure or a dielectric cylindrical structure.

[0081] A difference between the implementation shown in FIG. 16 and the implementation shown in FIG. 9 lies in that a quantity of gaps on the first dielectric plate 40 used to bear the first antenna 20 is different. In the implementation shown in FIG. 16, the first dielectric plate 40 has three gaps 24, the three gaps 24 are used to mount three second dielectric plates 50 in a one-to-one correspondence, and one second antenna 30 is disposed on each second dielectric plate 50. A manner of disposing the second antenna 30 on the second dielectric plate 50 is the same as the implementation shown in FIG. 8A, that is, the second antenna 30 is disposed on one surface of the second dielectric plate 50. Certainly, in another implementation, the second antenna 30 may alternatively be disposed on two or more layers of the second dielectric plate 50.

[0082] In the implementations shown in FIG. 16 and FIG. 17, the three second dielectric plates 50 are interconnected as a whole, and an intersection joint between the three second dielectric plates 50 forms a connection structure 501. The connection structure 501 is arranged on a bottom side of the feed element 21 of the first antenna 20 in the first direction A1, and spacing space 502 is provided between the connection structure 501 and the feed element 21. The spacing space 502 is used to accommodate the radio frequency cable connected to the first feed port P1. It may also be understood as follows: The spacing space 502 is formed between the first dielectric plate 40 and the connection structure 501 at the joint between the three second dielectric plates 50, to avoid the radio frequency cable at the first feed port P1.

[0083] Refer to FIG. 16, FIG. 17, and FIG. 18. In an implementation, the second dielectric plate 50 intersects with the first dielectric plate 40, a top edge region of the second dielectric plate 50 is located on the top side of the first dielectric plate 40, and a large partial region of the second dielectric plate 50 are located on the bottom side of the first dielectric plate 40. There is spacing space between a position of the second feed port P2 and a bottom surface of the first dielectric plate 40. A position of the first feed port P1 may be on the bottom surface of the first dielectric plate 40. Therefore, in this solution, the second feed port P2 and the first feed port P1 are disposed in a staggered manner in the first direction A1, to facilitate wiring. This solution can avoid a tight wiring space arrangement that is easily caused when the second feed port P2 and the first feed port P1 are on a same surface, which may result in poor factors such as poor isolation between the first feed port P1 and the second feed port P2, or disordered radio frequency cable routing.

[0084] Implementations shown in FIG. 11 to FIG. 20 are variants of the implementations shown in FIG. 4 to FIG. 6. In these implementations, the first antenna 20 and the second antenna 30 are cross-arranged, that is, a part of the second antenna 30 is located on the top side of the first antenna 20, and a part of the second antenna 30 is located on the bottom side of the first antenna 20. This implements an overall small-size design of the antenna assembly 10 formed by a plurality of antennas, and implements an antenna layout with a low-direction system and high isolation in compact space. This saves space, ensures fidelity of a pattern of each antenna by using a spatial arrangement relationship between the first antenna 20 and the second antenna 30, and implements the low directional coefficient. In addition, isolation between antennas can also meet a design requirement.

[0085] FIG. 21 to FIG. 26 are diagrams of position relationships between a first antenna 20, a second antenna 30, and a third antenna 70 of an antenna assembly 10 according to an implementation of this application. FIG. 21 and FIG. 22 are respectively three-dimensional diagrams of the antenna assembly 10 in two directions. FIG. 23 and FIG. 24 are respectively a top plane diagram and a bottom plane diagram of the antenna assembly 10. FIG. 25 and FIG. 26 are respectively side views of the antenna assembly 10 in two different directions. Refer to FIG. 21, FIG. 22, FIG. 23, FIG. 24, FIG. 25, and FIG. 26. In this implementation, the antenna assembly 10 includes one first antenna 20, three second antennas 30, and one third antenna 70. In an implementation, an operating frequency that is of the first antenna 20 and in which an electromagnetic wave signal can be excited by using one first feed port P1 is a first frequency band and a second frequency band. For example, the first frequency band includes 2.4 GHz to 2.5 GHz, and the second frequency band includes 5.15 GHz to 5.85 GHz. An operating frequency that is of each second antenna 30 and in which an electromagnetic wave signal can be excited by using a second feed port P2 is the first frequency band and the second frequency band. Similarly, the first frequency band may include 2.4 GHz to 2.5 GHz, and the second frequency band may include 5.15 GHz to 5.85 GHz. A third feed port P3 is further disposed on each second antenna 30, and an operating frequency that is of some radiation parts of the second antenna 30 and in which an electromagnetic wave signal is excited by using the third feed port P3 is a third frequency band. For example, the third frequency band includes 5.925 GHz to 7.125 GHz. In an implementation, the antenna assembly 10 further includes a fourth feed port P4, and an operating frequency band that is of the third antenna 70 and in which excitation is performed by using the fourth feed port P4 is the third frequency band. For example, the third frequency band includes 5.925 GHz to 7.125 GHz.

[0086] Refer to FIG. 21 and FIG. 22. In an implementation, one first antenna 20, three second antennas 30, and one third antenna 70 are interconnected as a whole, to implement structural integration and compactness of the antenna assembly 10. Refer to FIG. 23 and FIG. 24. The three second antennas 30 are disposed at gaps 24 formed by the first antenna 20. As shown in FIG. 25 and FIG. 26, a part of the second antenna 30 is located on a top side of the first antenna 20, a part of the second antenna 30 is located on a bottom side of the first antenna 20, and the third antenna 70 is also designed in a similar way. A part of the third antenna 70 is located on the top side of the first antenna 20, and a part of the third antenna 70 is located on the bottom side of the first antenna 20. For the second antenna 30, a large partial region is distributed on the bottom side of the first antenna 20, and a small partial region is distributed on the top side of the first antenna 20. For the third antenna 70, a large partial region is distributed on the top side of the first antenna 20, and a small partial region is distributed on the bottom side of the first antenna 20. The third antenna 70 is connected to the first antenna 20, and may be integrally designed with the first antenna 20. A plurality of antennas are integrally designed in such a relatively high density manner, so that an advantage of saving space is more obvious. In addition, radiation efficiency, low directivity coefficients, and isolation of each antenna can still be ensured in a compact spatial layout architecture.

[0087] In the implementation shown in FIG. 21 and FIG. 22, the first antenna 20 is rotationally symmetrically distributed on a first surface S1 by using a first central axis X1 as a center. Similar to the foregoing implementations, the first antenna 20 in this implementation is also distributed on two first surfaces S1, and an extension direction of the first central axis X1 is a first direction A1. Refer to FIG. 23 and FIG. 24. The first antenna 20 includes a feed element 21, a power division element 22, and a radiation element 23. The power division element 22 is connected between the feed element 21 and the radiation element 23. The feed element 21 is located in a central region of the first antenna 20. The first central axis X1 is a central axis of the feed element 21. The radiation element 23 includes a first radiation stub 23A and a second radiation stub 23B. The first radiation stub 23A is located on a periphery of the second radiation stub 23B. A distance between the first radiation stub 23A and the first central axis X1 is greater than a distance between the second radiation stub 23B and the first central axis X1. An electrical length of the first radiation stub 23A is greater than an electrical length of the second radiation stub 23B. The first radiation stub 23A and the second radiation stub 23B are distributed at a spacing in a radial direction. In the implementation shown in FIG. 21, the first antenna 20 forms three gaps 24, the gap 24 is used to dispose the second antenna 30, the radiation element 23 includes three subelements 231, the first radiation stub 23A forms a part of the three subelements 231, and the second radiation stub 23B forms a part of the three subelements 231. A first feed port P1 feeds power to the first antenna 20 at a position of the feed element 21, and feeding of the first feed port P1 can excite both the first radiation stub 23A and the second radiation stub 23B, so that the first radiation stub 23A operates in a first frequency band, and the second radiation stub 23B operates in a second frequency band. A frequency of the first frequency band is lower than a frequency of the second frequency band. For example, the first frequency band may include 2.4 GHz to 2.5 GHz, and the second frequency band may include 5.15 GHz to 5.85 GHz.

[0088] In the implementation shown in FIG. 21, there are three second antennas 30, and each second antenna 30 includes a first radiation part 30A, a second radiation part 30B, and a third radiation part 30C. In an implementation, the first radiation part 30A, the second radiation part 30B, and the third radiation part 30C may be disposed on a same plate. This same plate arrangement may be understood as that the three radiation parts are disposed on different surfaces of the same plate, or disposed on a same surface of the same plate. In the implementation shown in FIG. 21, the first radiation part 30A, the second radiation part 30B, and the third radiation part 30C are all disposed on two surfaces. Compared with a manner in which the second antenna 30 is disposed on the same surface, this implementation facilitates an overall small-size design of the second antenna 30. The first radiation part 30A is located between the second radiation part 30B and the third radiation part 30C. A distance between the first radiation part 30A and the second radiation part 30B is less than a distance between the first radiation part 30A and the third radiation part 30C. The third radiation part 30C is located between the first radiation part 30A and the first central axis X1. In addition, a distance between the third radiation part 30C and the first central axis X1 is less than a distance between the third radiation part 30C and the first radiation part 30A. The second feed port P2 feeds power to the first radiation part 30A and the second radiation part 30B. The antenna assembly 10 further includes a fourth feed port P4, and the fourth feed port P4 feeds power to the third radiation part 30C. In an implementation, an operating frequency band of the first radiation part 30A may include 2.4 GHz to 2.5 GHz, an operating frequency band of the second radiation part 30B may include 5.15 GHz to 5.85 GHz, and an operating frequency band of the third radiation part 30C includes 5.925 GHz to 7.125 GHz.

[0089] FIG. 27 is a diagram of a second antenna 30 in an antenna assembly according to a specific implementation of this application. Refer to FIG. 27. In an implementation, the second antenna includes a first radiation part 30A, a second radiation part 30B, a third radiation part 30C, and a feed stub 30D. The feed stub 30D may be a transmission line part between a second feed port P2 and a fourth feed port P4, or may be understood as that the fourth feed port P4 and the second feed port P2 are disposed on the feed stub 30D. The first radiation part 30A, the second radiation part 30B, and the third radiation part 30C are all symmetrically distributed on two sides of the feed stub 30D. One end of the feed stub 30D is connected to the third radiation part 30C, and the other end of the feed stub 30D is connected to the first radiation part 30A and the third radiation part 30C.

[0090] The first radiation part 30A includes a first section 30A1 and a second section 30A2. The first section 30A1 and the second section 30A2 are distributed on a same side of the feed stub 30D. The second section 30A2 and the feed stub 30D are spaced from each other. Two ends of the first section 30A1 are respectively connected to the feed stub 30D and the second section 30A2. The first section 30A1 and the second section 30A2 are not collinear. There are two first sections 30A1, and the two first sections 30A1 are symmetrically distributed on two sides of the feed stub 30D. There are also two second sections 30A2, and the two second sections 30A2 are symmetrically distributed on the two sides of the feed stub 30D. In an implementation, the second section 30A2 is parallel to the feed stub 30D, and an included angle between the first section 30A1 and the feed stub 30D is an acute angle. The second section 30A2 is located on a side that is of the first section 30A1 and that is away from the second radiation part 30B. The second section 30A2 is located on a side that is of the first section 30A1 and that faces the third radiation part 30C. In the implementation shown in FIG. 27, the second radiation part 30B includes L-shaped stubs symmetrically distributed on the two sides of the feed stub 30D, the third radiation part 30C includes two sub-stubs symmetrically distributed on the two sides of the feed stub 30D, and each sub-stub includes two line-shaped structure sections that are perpendicular to each other. A specific form of each radiation stub in the antenna assembly is not limited in this application, and specific forms of the first radiation part 30A, the second radiation part 30B, and the third radiation part 30C of the second antenna 30 are not limited to the foregoing content.

[0091] Refer to FIG. 27. The second antenna 30 further includes an extension stub 30E. There are two extension stubs 30E, and the extension stubs 30E are symmetrically distributed on the two sides of the feed stub 30D. One end of the extension stub 30E is connected to the second section 30A2 of the first radiation part 30A. The other end of the extension stub 30E faces the second radiation part 30B and forms a spacing slot with the second radiation part 30B. The extension stub 30E, the first section 30A1, and the second radiation part 30B are sequentially connected and form surrounded space through surrounding, and the spacing slot is an opening of the surrounded space. The extension stub 30E is configured to optimize a pattern of an electromagnetic wave beam generated by the second radiation part 30B. In a specific implementation, the extension stub 30E and the second section 30A2 are collinear.

[0092] In a specific implementation, refer to FIG. 28. FIG. 28 schematically shows a side view of the feed stub 30D. The feed stub 30D includes two feed lines 30D1 and 30D2 that are spaced from each other. The two feed lines 30D1 and 30D2 may be parallel to each other. A leftmost end of the feed stub 30D may be a second feed port P2, and is configured to connect to the first radiation part 30A. A rightmost end of the feed stub 30D may be the fourth feed port P4, and is configured to connect to the third radiation part 30C. A grounding structure 30D3 is disposed on the feed stub 30D. A distance between the grounding structure 30D3 and the second feed port P2 is a quarter of a dielectric wavelength of an operating frequency band of the first radiation part 30A. A distance between the grounding structure 30D3 and the fourth feed port P4 is a quarter of a dielectric wavelength of an operating frequency band of the third radiation part 30C. In a specific implementation, the antenna assembly provided in this embodiment of this application is a Wi-Fi antenna, and a distance between the grounding structure and the second feed port is greater than or equal to 7 mm and less than or equal to 8 mm. For example, in a specific implementation, the distance between the grounding structure and the second feed port is 7.5 mm. A distance between the grounding structure and the fourth feed port is greater than or equal to 3 mm and less than or equal to 4 mm. For example, in a specific implementation, the distance between the grounding structure and the fourth feed port is 3.5 mm.

[0093] The grounding structure 30D3 in FIG. 28 includes two grounding posts, the second feed port P2 is located at a position of a leftmost end of the feed stub 30D, and the fourth feed port P4 is located at a position of a rightmost end the feed stub 30D. A distance L1 between a left-side grounding structure 30D3 and the leftmost end of the feed stub 30D is a quarter of a wavelength of the operating frequency band of the first radiation part 30A, and a distance L2 between a rightside grounding structure 30D3 and the rightmost end of the feed stub 30D is a quarter of a wavelength of the operating frequency band of the third radiation part 30C. In another implementation, there may be one or more grounding structures 30D3.

[0094] In the implementations shown in FIG. 21 and FIG. 22, the antenna assembly 10 further includes a third antenna 70, a radiator of the third antenna 70 is a third radiation stub 70A, and the third radiation stub 70A is connected to the first antenna 20.

[0095] FIG. 29 and FIG. 30 are diagrams of a position relationship between and specific structures of a first antenna 20 and a third antenna 70. Refer to FIG. 29 and FIG. 30. In a radial direction of the first antenna 20, a radiator of the third antenna 70, namely, a third radiation stub 70A, is located in a region surrounded by a second radiation stub 23B of the first antenna 20, and the third radiation stub 70A and a feed element 21 of the first antenna 20 partially overlap. Refer to FIG. 29, FIG. 30, and FIG. 31. In an extension direction of a first central axis X1 of the first antenna 20 (namely, in a first direction A1), a part of the third radiation stub 70A is located on a top side of the first antenna 20, and a part of the third radiation stub 70A is located on a bottom side of the first antenna 20. The antenna assembly 10 further includes a third feed port P3, and the third feed port P3 feeds power to the third radiation stub 70A. FIG. 29 is a diagram of space on a top side of the first antenna 20, and FIG. 30 is a diagram of space on a bottom side of the first antenna 20. A large partial region of the third radiation stub 70A of the third antenna 70 is distributed on the top side of the first antenna 20, and a small partial region extends to the bottom side of the first antenna 20. However, in FIG. 21 and FIG. 22, a large partial region of the second antenna 30 is distributed on the bottom side of the first antenna 20, and a small partial region extends to the top side of the first antenna 20. In a specific implementation of this application, this asymmetric distribution direction is used to appropriately arrange positions of the second antenna 30 and the third antenna 70. This helps implement miniaturization of an overall size of the antenna assembly 10, helps ensure low directional coefficients of patterns of the second antenna 30, the third antenna 70, and the first antenna 20, ensures full horizontal coverage of the antennas, and ensure balance of radiation performance.

[0096] Refer to FIG. 29, FIG. 30, and FIG. 31. The third radiation stub 70A located on the top side of the first antenna 20 is in contact with the feed element 21 of the first antenna 20. Starting from a gap 24 of the first antenna 20, the third radiation stub 70A passes through the gap 24 and extends to the bottom side of the first antenna 20. A part of the third radiation stub 70A on the bottom side of the first antenna 20 and the feed element 21 are spaced from each other with, that is, are not in contact. The antenna assembly 10 further includes a decoupling stub 80. A part of the decoupling stub 80 is electrically connected to the third radiation stub 70A on the top side of the first antenna 20, and the other part of the decoupling stub 80 is electrically connected to the feed element 21 of the first antenna 20 on the bottom side of the first antenna 20. The decoupling stub 80 is configured to improve isolation between the first antenna 20 and the third radiation stub 70A. In a specific implementation shown in FIG. 31, the decoupling stub 80 is in an L shape. In an implementation, the decoupling stub 80 includes a first decoupling section 81 and a second decoupling section 82. The first decoupling section 81 is on the bottom side of the first antenna 20, and is in contact with the feed element 21 of the first antenna 20. An extension direction of the first decoupling section 81 may be the radial direction of the first antenna 20. The second decoupling section 82 passes through the first antenna 20, and is connected between the first decoupling section 81 and the third radiation stub 70A. An extension direction of the second decoupling section 82 may be the first direction A1, namely, the extension direction of the first central axis X1 of the first antenna 20.

[0097] In an implementation, a vertical spacing between the first decoupling section 81 and the third radiation stub 70A in the first direction A1 is equal to a thickness of the first antenna 20 in the first direction, and both the first decoupling section 81 and the third radiation stub 70A are in contact with the first antenna 20. In an implementation, the vertical spacing between the first decoupling section 81 and the third radiation stub 70A in the first direction A1 is slightly less than the thickness of the first antenna 20 in the first direction A1. In this way, the first decoupling section 81 and the third radiation stub 70A have a clamping force on the first antenna 20, so that reliability of an electrical connection between the first antenna 20 and the third antenna 70 can be ensured.

[0098] Refer to FIG. 31A and FIG. 31B. A left diagram of FIG. 31A is a current distribution diagram of the third antenna 70 on which no decoupling stub 80 is disposed. A right diagram of FIG. 31A is a current distribution diagram of the third antenna 70 on which a decoupling stub 80 is disposed. FIG. 31B is an isolation comparison diagram before and after adding of a decoupling stub. It can be learned from FIG. 31A that, when the first antenna is excited, a part of a current flows to a feed port of the third antenna, namely, a position of a fourth feed port. As a result, isolation between the first antenna and the third antenna is relatively poor. When the decoupling stub is disposed, the decoupling stub has a cancellation function for the currents flowing to the third antenna. An increase of the decoupling stub is equivalent to adding one current path. It can be learned from a comparison of current distribution diagrams that, after the decoupling stub is added, currents flowing from the first antenna to the third antenna are obviously reduced. This manner of improving the isolation has a wideband advantage, can optimize the isolation by more than 10 dB across entire 5 GHz to 7 GHz wideband, and overall isolation reaches -28 dB.

[0099] Refer to FIG. 32. In an implementation, the antenna assembly 10 further includes an additional stub 60, where the additional stub 60 is connected between two second antennas 30, to implement decoupling between the two second antennas 30. The additional stub 60 connected between the two second antennas 30 includes a first additional stub section 61 and a second additional stub section 62. The first additional stub section 61 and the second additional stub section 62 are separated by an additional stub gap 601. The first additional stub section 61 is connected to one second antenna 30, and the second additional stub section 62 is connected to the other second antenna 30. A size of the additional stub gap 601 ranges from 0.1 mm to 2 mm. The size of the additional stub gap 601 may be understood as a shortest straight-line distance between a free end of the first additional stub section 61 and a free end of the second additional stub section 62. The first additional stub section 61 and the second additional stub section 62 may be any one or a combination of the following: a straight line shape, a curve shape, or a bent line shape. A centralized device, like a capacitor or an inductor, may be disposed on the first additional stub section 61 and / or the second additional stub section 62.

[0100] In this implementation, a connection position between the additional stub 60 and the second antenna 30 is close to a fourth feed port P4, and a vertical distance between the fourth feed port P4 and the connection position between the additional stub 60 and the second antenna 30 may be 0 mm to 3 mm. In a specific implementation, the additional stub 60 and a feed stub 30D are collinear, and are both in a straight line shape. In another implementation, the additional stub 60 may alternatively be in another form, for example, a curve shape, or a bent line shape.

[0101] Refer to FIG. 32A, FIG. 32B, and FIG. 32C. The three diagrams are respectively a current distribution diagram in which no additional stub is disposed between two second antennas, a current distribution diagram in which an additional stub is disposed between the two second antennas (but there is no gap on the additional stub), and a current distribution diagram in which the additional stub is disposed between the two second antennas and there is an additional stub gap on the additional stub. It can be learned from the figures that, in this application, the additional stub is disposed between two second antennas, so that a current flowing from the additional stub counteracts an original coupling current, to improve isolation between the second antennas. The additional stub gap is provided, which is equivalent to serially connecting a capacitor structure to the additional stub. This can improve isolation within an operating frequency band range.

[0102] FIG. 32D is an isolation comparison in states shown in FIG. 32A, FIG. 32B, and FIG. 32C. It can be learned from FIG. 32D that, when no additional stub is disposed, isolation between adjacent antennas is only -13 dB. When the additional stub is disposed, the isolation between the antennas can reach -15 dB. When the additional stub gap is disposed on the additional stub, the isolation between the antennas can reach more than -18 dB.

[0103] In an implementation shown in FIG. 21, there are three second antennas 30 in the antenna assembly 10. In another implementation, there may be one, two, or more second antennas 30. An example in which the antenna assembly 10 has three second antennas 30 is used for description. In a specific implementation, each second antenna 30 is disposed on one separate second dielectric plate, one second antenna 30 and one third antenna 70 are disposed on second dielectric plate, and only one second antenna 30 is disposed on a remaining second dielectric plate. The second dielectric plate shared by one second antenna 30 and one third antenna 70 is referred to as a plate 1, and the second dielectric plate on which only one second antenna 30 is disposed is referred to as a plate 2.

[0104] FIG. 33 and FIG. 34 show a front view and a rear view of the second dielectric plate (namely, the plate 1) in a solution in which one second antenna and one third antenna are disposed on the same plate. Refer to FIG. 33 and FIG. 34. The second dielectric plate 50 (plate 1) includes a main body part 51 and a corner part 52. The main body part 51 is configured to dispose the second antenna 30. The corner part 52 is configured to dispose the third antenna 70, namely, a third radiation stub 70A. The corner part 52 is connected to a corner position of the main body part 51, and the corner part 52 is provided with a cutting slot 521. The cutting slot 521 is used to accommodate a central region of a first dielectric plate 40. The cutting slot 521 is formed between a part of the third radiation stub 70A and a part of the decoupling stub 80.

[0105] An extension path of the feed stub 30D of the second antenna 30 that is disposed on the same plate as the third antenna 70 includes a bent form. In the implementations shown in FIG. 33 and FIG. 34, the feed stub 30D includes three transmission sections that are sequentially connected between the second feed port P2 and the fourth feed port P4: a first transmission section 30D1, a second transmission section 30D2, and a third transmission section 30D3. The second transmission section 30D2 bends and extends relative to the first transmission section 30D1, and the third transmission section 30D3 bends and extends relative to the second transmission section 30D2. For example, the second transmission section 30D2 is vertically connected between the first transmission section 30D1 and the third transmission section 30D3, and the first transmission section 30D1 and the third transmission section 30D3 may be parallel to each other. The feed stub 30D is disposed in the bent form, to help isolate the third radiation part 30C of the second antenna 30 from the third antenna 70, and maintain a safe distance range between the fourth feed port P4 and the third feed port P3. For example, the third antenna 70 is disposed in an upper right corner of the second dielectric plate 50 (plate 1), and the third radiation part 30C is close to a lower right corner of the second dielectric plate 50 (plate 1). Because operating frequency bands of the third radiation part 30C and the third antenna 70 are both a third frequency band, to ensure that the third radiation part 30C and the third antenna 70 are independent of each other, the feed stub 30D is disposed in the bent form, to increase a physical distance between the third radiation part 30C and the third antenna 70. This can ensure that radiation performance of the two antennas can both meet a use requirement.

[0106] Refer to FIG. 33 and FIG. 34. In an implementation, the second antenna 30 is distributed on a front side and a back side of the second dielectric plate 50 (plate 1), and the third antenna 70 is disposed only on one surface of the second dielectric plate 50 (plate 1). As shown in FIG. 34, the third antenna 70 is located on a back side of a corner part 52 of the second dielectric plate 50 (plate 1), and neither transmission line nor radiation stub may be disposed on a front side of the corner part 52. In another implementation, the third antennas 70 may alternatively be distributed on both front and back sides of the corner part 52.

[0107] FIG. 35 and FIG. 36 are diagrams of a front side and a back side of a second dielectric plate 50 (plate 2). Refer to FIG. 35 and FIG. 36. The plate 2 is a rectangular plate-shaped structure, a form of a feed stub 30D of a second antenna 30 disposed on the plate 2 is different from a form of the feed stub 30D of the second antenna 30 disposed on the plate 1, and the feed stub 30D of the second antenna 30 disposed on the plate 2 is in a straight line shape and is located at a central position of the plate 2 in a width direction. An extension direction of the feed stub 30D on the plate 2 is a length direction of the plate 2. A recess 522 is provided at a corner position of the plate 2, and the recess 522 is configured to match a central region of the first dielectric plate 40, to implement assembly and connection between the second dielectric plate 50 (plate 2) and the first dielectric plate 40. After the second dielectric plate 50 (plate 2) and the first dielectric plate 40 are assembled, the second dielectric plate 50 (plate 2) is inserted into the gap 24 of the first dielectric plate 40, and the central region of the first dielectric plate 40 laps over a position of the recess 522 of the second dielectric plate 50 (plate 2), to form a stable connection relationship.

[0108] Refer to FIG. 37. In an implementation, the first antenna 20 is disposed on the first dielectric plate 40, and the gap 24 is provided on the first dielectric plate 40. For example, there are three gaps 24. In an implementation, the first dielectric plate 40 is in a circular plate shape, the gap 24 extends from an outer edge of the first dielectric plate 40 to the central region, an opening end of the gap 24 is located at the outer edge of the first dielectric plate 40, and a bottom end of the gap 24 and the feed element 21 of the first antenna 20 are spaced from each other.

[0109] Refer to FIG. 38 and FIG. 39. The second dielectric plate 50 is mounted at a position of the gap 24 of the first dielectric plate 40. For the plate 1, the cutting slot 521 in the plate 1 matches the central region of the first dielectric plate 40, that is, the central region of the first dielectric plate 40 is inserted into the cutting slot 521, to implement a connection between the plate 1 and the first dielectric plate 40. The feed element of the first antenna 20 is distributed on both a top surface and a bottom surface of the central region. A part of the central region is inserted into the cutting slot 521, so that a part of the third radiation stub 70A is in contact with a part of the feed element of the first antenna on the top surface of the central region. For the plate 2, the recess 522 of the plate 2 matches the central region of the first dielectric plate 40, so that the central region of the first dielectric plate 40 laps over the position of the recess 522, to implement a connection between the plate 2 and the first dielectric plate 40.

[0110] Refer to FIG. 40. A partial region of the second dielectric plate 50 (plate 1) extends to an inside of the feed element 21 of the first antenna 20 in the central region of the first dielectric plate 40, and the other two second dielectric plates 50 (plate 2) are located at a periphery of the feed element 21 of the first antenna 20. Refer to FIG. 41. Partial regions of the three second dielectric plates 50 (including the plate 1 and the plates 2) all extend to the inside of the feed element 21 of the first antenna 20 in the central region of the first dielectric plate 40.

[0111] Refer to FIG. 42 and FIG. 43. In an implementation shown in FIG. 42, a left diagram of FIG. 42 shows that an antenna assembly includes only three second antennas, and a right diagram of FIG. 42 shows a 2.45 GHz current distribution diagram in an architecture including the only three second antennas. In an implementation shown in FIG. 43, a left diagram of FIG. 43 shows that an antenna assembly includes three second antennas and one first antenna, and a right diagram of FIG. 43 shows a 2.45 GHz current distribution diagram when the first antenna is added on the basis of the three second antennas. FIG. 44 is an isolation curve diagram when one first antenna is added on the basis of three second antennas. It can be learned from FIG. 44 that, the first antenna is introduced into the second antenna, the first antenna is located close to a second section of a first radiation part of a second antenna, and isolation can be improved to more than - 15 dB. A main reason is that a part of a current from the first radiation part of 2.4 GHz is coupled to the first antenna, and a part of a current coupled to an adjacent second antenna is blocked, improving isolation between adjacent second antennas.

[0112] The antenna assembly provided in the implementations shown in FIG. 21 to FIG. 41 is an integrated multi-antenna structure. The second antenna, the third antenna, and the first antenna are vertically placed in space, to implement high-isolation tri-band Wi-Fi 4*4 MIMO coverage. In this application, the solution adds a 6E frequency band when maintaining a spatial size design range of the dual-band antenna (for example, 2.4 GHz and 5 GHz) solution. This implements an architecture in which more antennas are arranged in limited space, and facilitates overall structural compactness of the antenna assembly. In a specific design architecture, the three second antennas are spaced 120 degrees from each other, and are overall placed vertically with the first antenna. Specifically, the second antenna is inserted into the gap formed by the first antenna, that is, the second antenna and the first antenna are disposed orthogonally. A part of the second antenna is located on the top side of the first antenna, and a part of the second antenna is located on the bottom side of the first antenna. This design solution can save space more significantly and obtain a miniaturized antenna assembly. In a specific implementation of this application, the third antenna is added, the third antenna and one second antennas are disposed on a same plate, the third antenna is electrically connected to the feed element 21 of the first antenna, and the antenna in the 6E frequency band is added, so that a total quantity of antennas in the 6E frequency band is the same as a quantity of antennas in another frequency band. Signals in the three frequency bands that can be covered by the antenna assembly provided in this application have a relatively stable and balanced signal coverage capability.

[0113] The antenna assembly provided in the implementations shown in FIG. 21 to FIG. 41 is an integrated multi-antenna structure. There are totally eight feed ports: three second feed ports P2, three fourth feed ports P4, one first feed port P1, and one third feed port P3. The radiation structures of the antenna are disposed on four dielectric plates: one first dielectric plate 40, and other three are second dielectric plates 50. Two feed ports are disposed on each dielectric plate. In this implementation, a solution of integrated multi-feed eight Wi-Fi antennas is implemented, to implement a low directivity coefficient in compact space. Feeding of the first feed port P1 and the three second feed ports P2 can both excite electromagnetic wave signals in two frequency bands (a first frequency band and a second frequency band). Feeding of the third feed port P3 and the three fourth feed ports P4 can excite electromagnetic wave signals in a third frequency band. Each antenna in the antenna assembly provided in this implementation meets omnidirectional horizontal coverage. A specific structure of the antenna assembly provided in this implementation is not limited to the foregoing content, and may be expanded to a structure of N antennas, that is, N second antennas are inserted by using N gaps of the first antenna, to form overall coverage of N+1 MIMO antennas.

[0114] FIG. 45 is an S parameter diagram of a tri-band antenna architecture including a second antenna in a working state in three frequency bands. It can be learned from FIG. 45 that the second antenna in a first frequency band, a second frequency band, and a third frequency band all meets a use requirement.

[0115] FIG. 46 is a current distribution diagram of three second antennas in three frequency bands. It can be learned from FIG. 46 that the second antenna can excite electromagnetic wave signals in three frequency bands, and isolation between different radiation parts is relatively good.

[0116] FIG. 47 is a pattern of three second antennas in three frequency bands. It can be learned from FIG. 47 that directivity of the patterns of the second antennas in the three frequency bands meets requirements. In particular, in two operating frequency bands, namely, 2.45 GHz and 5.3 GHz, patterns have no pit and have a low directional coefficient. In a 6.5 GHz operating frequency band, although there is a pit in a local region, an overall omnidirectional coverage requirement is met.

[0117] FIG. 48 is an S parameter diagram of a tri-band antenna architecture including a first antenna and a third antenna in a working state in three frequency bands. It can be learned from FIG. 48 that the first antenna in a first frequency band and a second frequency band, and the third antenna in a third frequency band all meets a use requirement.

[0118] FIG. 49 is a current distribution diagram of a first antenna in a first frequency band and a second frequency band, and a current distribution diagram of a third antenna in a third frequency band. It can be learned from FIG. 49 that isolation between the first antenna and the third antenna is relatively good.

[0119] FIG. 50 is a pattern of a first antenna in a first frequency band and a second frequency band, and a pattern of a third antenna in a third frequency band. It can be learned from FIG. 50 that directivity of the patterns of the first antenna in the first frequency band and the second frequency band and the third antenna in the third frequency band meet a requirement. In particular, when the first antenna is in a 2.45 GHz operating frequency band and the third antenna is in a 6.5 GHz operating frequency band, patterns have no pit and have a low directional coefficient. For the first antenna in the 5.3 GHz operating frequency band, although there is a pit in a local region, an overall omnidirectional coverage requirement is met.

[0120] In another implementation, the second antenna may alternatively have only the first radiation part 30A, the second radiation part 30B, and the second feed port for feeding, that is, the antenna assembly does not include the fourth feed port and the third radiation part 30C. The antenna assembly does not include the third antenna either. Such antenna assembly forms dual-band Wi-Fi 4*4 MIMO coverage.

[0121] According to the antenna assembly provided in this application, the following can be implemented: 1. A combined gain of the antenna assembly is 0 dBi both in the first frequency band and the second frequency band, and power backoff does not need to be performed on an actual product. 2. The directional coefficient of the antenna operating in the first frequency band and the second frequency band is less than 3.5 dBi. 3. The patterns of the antenna assembly have relatively good fidelity, and pit on the horizontal plane can be avoided. 4. Isolation between a plurality of antennas of the same or adjacent frequencies that are distributed at a short distance meets the design requirement (greater than 15 dBi). The communication device to which the antenna assembly provided in embodiments of this application is specifically applied may be but is not limited to an IoT (Internet of things) related product (for example, a CPE wireless gateway device), or may be expanded to another antenna scenario in which omnidirectional coverage of a horizontal pattern needs to be used.

[0122] The foregoing has described embodiments of this application. The foregoing descriptions are examples, not exhaustive, and are not limited to the disclosed embodiments. Many modifications and changes are apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments. Selection of terms used in this specification is intended to best explain the principles of embodiments, actual application, or improvements to technologies in the market, or to enable another person of ordinary skill in the art to understand embodiments disclosed in this specification.

Claims

1. An antenna assembly, comprising: a first antenna, formed on at least one first surface, wherein a direction perpendicular to the first surface is a first direction, the first antenna comprises a feed element, a power division element, and a radiation element, the power division element is connected between the feed element and the radiation element, the radiation element surrounds the power division element and the feed element, the radiation element comprises a plurality of subelements that are spaced from each other, a gap is formed between the adjacent subelements, and the gap passes through the first surface in the first direction; a first feed port, connected to the feed element, and configured to feed to the first antenna; a second antenna, disposed at a position of the gap, wherein a part of the second antenna is located on a top side of the first antenna in the first direction, and a part of the second antenna is located on a bottom side of the first antenna in the first direction; and a second feed port, configured to feed to the second antenna.

2. The antenna assembly according to claim 1, wherein the first antenna has a radial direction and a circumferential direction, the radial direction is a direction that points from the feed element to the radiation element, the circumferential direction is an extension direction of a surrounding path formed by the radiation element, and a vertical projection of the second antenna on the first surface in the first direction is located within a range of the gap in the circumferential direction.

3. The antenna assembly according to claim 1 or 2, wherein the first antenna is a dipole antenna, and the second antenna is a dipole antenna.

4. The antenna assembly according to any one of claims 1 to 3, wherein there are a plurality of second antennas, the second antenna and the gap are disposed in a one-to-one correspondence, there are a plurality of second feed ports, and the second feed port and the second antenna are disposed in a one-to-one correspondence.

5. The antenna assembly according to claim 4, wherein the antenna assembly comprises an additional stub, and the additional stub is connected between the two adjacent second antennas.

6. The antenna assembly according to claim 5, wherein a distance between the second feed port and a connection position between the additional stub and the second antenna ranges from 0 mm to 3 mm.

7. The antenna assembly according to claim 5 or 6, wherein the additional stub comprises a first additional stub section and a second additional stub section, the first additional stub section and the second additional stub section are separated by an additional stub gap, the first additional stub section is connected to one of the second antennas, and the second additional stub section is connected to another one of the second antennas.

8. The antenna assembly according to claim 7, wherein a size of the additional stub gap ranges from 0.1 mm to 2 mm.

9. The antenna assembly according to any one of claims 1 to 8, wherein the first antenna is rotationally symmetrically distributed on the first surface by using a first central axis as a center, an extension direction of the first central axis is the first direction, the radiation element of the first antenna comprises a first radiation stub and a second radiation stub, the antenna assembly further comprises a third antenna, a radiator of the third antenna is a third radiation stub, the third radiation stub is connected to the feed element of the first antenna, a distance between the first radiation stub and the first central axis is greater than a distance between the second radiation stub and the first central axis, a distance between the third radiation stub and the first central axis is less than the distance between the second radiation stub and the first central axis, the antenna assembly further comprises a third feed port, and the third feed port feeds power to the third radiation stub.

10. The antenna assembly according to claim 9, wherein the antenna assembly comprises one first dielectric plate and a plurality of second dielectric plates, the first radiation stub and the second radiation stub are disposed on the first dielectric plate, the third radiation stub and one of the second antennas are disposed on one of the second dielectric plates, another one of the second antennas is disposed on another one of the second dielectric plates in a one-to-one correspondence, and the first dielectric plate and the second dielectric plate are disposed at an included angle.

11. The antenna assembly according to claim 9, wherein one of the second dielectric plates comprises a main body part and a corner part, the main body part is configured to dispose the second antenna, the corner part is configured to dispose the third radiation stub, the corner part is connected to a corner position of the main body part, the corner part is provided with a cutting slot, the first dielectric plate comprises a central region, the feed element of the first antenna is disposed in the central region, and distributed on both a top surface and a bottom surface of the central region, and a part of the central region is inserted into the cutting slot, so that a part of the third radiation stub is in contact with a part of the feed element on the top surface of the central region.

12. The antenna assembly according to any one of claims 9 to 11, wherein each of the second antennas comprises a first radiation part, a second radiation part, and a third radiation part that are disposed on a same plate, the first radiation part is located between the second radiation part and the third radiation part, a distance between the first radiation part and the second radiation part is less than a distance between the first radiation part and the third radiation part, the third radiation part is located between the first radiation part and the first central axis, a distance between the third radiation part and the first central axis is less than a distance between the third radiation part and the first radiation part, the second feed port feeds power to the first radiation part and the second radiation part, the antenna assembly further comprises a fourth feed port, and the fourth feed port feeds power to the third radiation part.

13. The antenna assembly according to claim 12, wherein the second antenna comprises a feed stub, the fourth feed port and the second feed port are disposed on the feed stub, the first radiation part, the second radiation part, and the third radiation part are all symmetrically distributed on two sides of the feed stub, one end of the feed stub is connected to the third radiation part, and the other end of the feed stub is connected to the first radiation part and the third radiation part.

14. The antenna assembly according to claim 13, wherein the first radiation part comprises a first section and a second section, the first section and the second section are distributed on a same side of the feed stub, the second section and the feed stub are spaced from each other, two ends of the first section are respectively connected to the feed stub and the second section, and the first section and the second section are not collinear.

15. The antenna assembly according to claim 14, wherein the second section is parallel to the feed stub, and an included angle between the first section and the feed stub is an acute angle.

16. The antenna assembly according to claim 14 or 15, wherein the second antenna further comprises an extension stub, one end of the extension stub is connected to the second section, the other end of the extension stub faces the second radiation part and forms a spacing slot with the second radiation part, the extension stub, the first section, and the second radiation part are sequentially connected and form surrounded space through surrounding, the spacing slot is an opening of the surrounded space, and the extension stub is configured to optimize a pattern of an electromagnetic wave beam generated by the second radiation part.

17. The antenna assembly according to any one of claims 13 to 16, wherein a grounding structure is disposed on the feed stub, a distance between the grounding structure and the second feed port is greater than or equal to 7 mm and less than or equal to 8 mm, and a distance between the grounding structure and the fourth feed port is greater than or equal to 3 mm and less than or equal to 4 mm.

18. The antenna assembly according to any one of claims 12 to 17, wherein a part of the third radiation stub is located on a top surface of the first dielectric plate and is electrically connected to the first antenna, a part of the third radiation stub passes through the first dielectric plate from the gap and is located on a side of a bottom surface of the first dielectric plate, the antenna assembly further comprises a decoupling stub, a part of the decoupling stub is electrically connected to the third radiation stub, the other part of the decoupling stub is located on a side of the bottom surface of the first dielectric plate and is electrically connected to the first antenna, and the decoupling stub is configured to improve isolation between the first antenna and the third radiation stub.

19. A communication device, comprising a circuit board and the antenna assembly according to any one of claims 1 to 18, wherein a radio frequency circuit is disposed on the circuit board, and the first feed port and the second feed port are electrically connected to the radio frequency circuit.

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