Antenna assembly and network device

Abstract

Embodiments of the present application relate to the technical field of antennas. Disclosed are an antenna assembly and a network device, aiming at improving the performance of the antenna assembly. The specific solution is as follows: an antenna assembly comprises a monopole antenna used for radiating electromagnetic waves of a first center frequency and a second center frequency, wherein the monopole antenna comprises a first branch and a second branch; the first branch is connected to a signal line; the second branch comprises a main arm, two first secondary arms, and two second secondary arms; one end of each first secondary arm is connected to the main arm, one end of each second secondary arm is connected to the main arm, and the main arm is connected to a ground line; the length of each first secondary arm ranges from 0.35λ1 to 0.55λ1, λ1 being a dielectric waveguide wavelength corresponding to the first center frequency; and the length of each second secondary arm ranges from 0.45λ2 to 0.65λ2, λ2 being a dielectric waveguide wavelength corresponding to the second center frequency. The antenna assembly can improve the stability of multi-link operations of a WiFi7 system, and optimize the radiation pattern.

Description

An antenna assembly and a network device

[0001] This application claims priority to Chinese Patent Application No. 202411960041.5, filed with the State Intellectual Property Office of China on December 25, 2024, entitled “An Antenna Assembly and Network Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of antenna technology, and more particularly to an antenna assembly and a network device. Background Technology

[0003] Multi-frequency antenna co-location design is beneficial for improving antenna integration. It is applied in various scenarios, such as 4G / 5G, Wi-Fi 6, Wi-Fi 6E, Wi-Fi 7, Wi-Fi 8, and Fiber to the Room (FTTR). Especially in Wi-Fi 7 Multi-Link Operation (MLO), multiple frequencies operate and connect simultaneously, significantly improving communication stability and throughput.

[0004] The performance of the antenna components directly affects the communication quality. Summary of the Invention

[0005] This application provides an antenna assembly and a network device designed to optimize the performance of the antenna assembly.

[0006] To achieve the above objectives, this application adopts the following technical solution.

[0007] In a first aspect, this application provides an antenna assembly. The antenna assembly includes a first feed line and a monopole antenna. The first feed line includes a first signal line and a first ground line. The monopole antenna radiates electromagnetic waves with a first center frequency and a second center frequency, the second center frequency being greater than the first center frequency. The monopole antenna includes a first stub and a second stub, the first stub being connected to the first signal line. The second stub includes a main arm, two first arms, and two second arms, one end of each first arm being connected to the main arm, and one end of each second arm being connected to the main arm, the main arm being connected to the first ground line. The length of the first arm is 0.35 to 0.55 times λ1, where λ1 is the dielectric waveguide wavelength corresponding to the first center frequency; the length of the second arm is 0.45 to 0.65 times λ2, where λ2 is the dielectric waveguide wavelength corresponding to the second center frequency.

[0008] Thus, the main arm, the first stub, and the two first-stage arms are primarily used to radiate electromagnetic waves at the first center frequency. The main arm, the first stub, and the two second-stage arms are primarily used to radiate electromagnetic waves at the second center frequency. This arrangement of the main arm, the two first-stage arms, and the two second-stage arms allows for horizontal omnidirectional radiation in a monopole form, and also helps to improve the problems of non-circular and tilted radiation patterns in the antenna assembly. Furthermore, the second stub helps to improve the balance of the feed current into the first feed line, thereby enhancing the performance of the antenna assembly.

[0009] In conjunction with the first aspect, in some feasible embodiments, the two secondary arms are respectively connected to the opposite ends of the main arm, and the two primary arms are disposed between the two secondary arms. Thus, the space between the two primary arms can be used to accommodate other components.

[0010] In conjunction with the first aspect, in some feasible embodiments, the monopole antenna further includes a parasitic radiating stub. The first stub includes a first conductive portion, an inverter, and a second conductive portion connected in sequence, with the end of the first conductive portion away from the inverter used to connect to the first signal line; the vertical projection of the parasitic radiating stub onto the second conductive portion overlaps with the second conductive portion.

[0011] Thus, the inverter is used to reverse the phase of the electromagnetic wave at the first center frequency by 180°. Since the first and second center frequencies are not equal, the phase adjustment of the inverter for the electromagnetic wave at the second center frequency is not 180°. This may result in poor phase adjustment performance for both the first and second center frequencies. Parasitic stubs effectively correct this problem, thereby improving the gain of the monopole antenna.

[0012] In conjunction with the first aspect, in some feasible implementations, the length of the parasitic radiating stub is 0.45 to 0.65 times λ². Thus, the arrangement of the parasitic radiating stub can significantly improve the gain of the electromagnetic wave at the second center frequency.

[0013] In conjunction with the first aspect, in some feasible implementations, the antenna assembly further includes a dipole antenna and a substrate. The dipole antenna radiates electromagnetic waves at a third center frequency, which is greater than the first center frequency and greater than or less than the second center frequency. Both the dipole antenna and the monopole antenna are disposed on the substrate. On the substrate, the first stub, the second stub, and the dipole antenna are distributed along a first direction. Thus, the antenna assembly can radiate electromagnetic waves at the first, second, and third center frequencies. This expands the application scenarios of the antenna assembly. For example, the antenna assembly can be used in a three-band MLO scenario.

[0014] In conjunction with the first aspect, in some implementable ways, the antenna assembly further includes a second feed line, the second feed line including a second signal line and a second ground line.

[0015] The dipole antenna includes a third stub, a fourth stub, and a fifth stub. The fourth stub is coupled to the third stub, and the third stub is connected to the second signal line. The fifth stub is connected to the second ground line; the fourth stub is connected to the first ground line.

[0016] Thus, the fourth stub can suppress the current on the first ground wire, reducing the interference of the first ground wire on the current on the dipole antenna. This is beneficial for improving the gain of the antenna assembly and optimizing the antenna pattern. The gain of the radiated signal at the first center frequency is significant.

[0017] In conjunction with the first aspect, in some implementable embodiments, the antenna assembly further includes an isolator disposed on the substrate. Along the first direction, the isolator is located between the second stub and the dipole antenna.

[0018] In this way, the isolator can reduce mutual interference between dipole and monopole antennas, and improve the isolation between them. This allows the antenna assembly to operate in three frequency bands, while reducing adjacent channel interference and improving antenna performance.

[0019] In conjunction with the first aspect, in some feasible embodiments, the projection of the isolator in the extension direction of the main arm overlaps with the main arm. Thus, the isolator can effectively reduce interference from the second stub to the dipole antenna.

[0020] In conjunction with the first aspect, in some feasible ways, the isolator is connected to the first ground wire. Thus, the isolator can suppress the current on the first ground wire, reducing the impact and interference of this current on the dipole antenna. This improves the gain of the monopole antenna and optimizes the radiation pattern of the antenna assembly.

[0021] In conjunction with the first aspect, in some feasible implementations, the isolator is a U-shaped structure with the opening of the U-shape facing the monopole antenna. This can improve the gain of the antenna assembly and reduce interference between the dipole antenna and the monopole antenna.

[0022] In conjunction with the first aspect, in some feasible ways, the first direction is perpendicular to the extension direction of the main arm.

[0023] Secondly, this application provides an antenna assembly. The antenna assembly includes a substrate, a monopole antenna, a first feed line, a second feed line, and a dipole antenna. The monopole antenna is disposed on the substrate and is used to radiate electromagnetic waves at a first center frequency and a second center frequency, wherein the first center frequency is less than the second center frequency. The first feed line includes a first signal line and a first ground line, used to feed the monopole antenna. The second feed line includes a second signal line and a second ground line. The dipole antenna is disposed on the substrate and is used to radiate electromagnetic waves at a third center frequency, wherein the third center frequency is greater than the first center frequency, and the third center frequency is greater than or less than the second center frequency. The dipole antenna includes a first arm, a second arm, and a third arm; the second arm is coupled to the first arm, and the first arm is connected to the second signal line; the third arm is connected to the second ground line. The second arm is connected to the first ground line.

[0024] In this way, connecting the second arm to the first ground wire helps reduce the impact of the current on the first ground wire on the dipole antenna. It also helps improve the gain of the monopole antenna and improve the radiation pattern of the antenna assembly.

[0025] In conjunction with the second aspect, in some feasible implementations, the monopole antenna further includes a parasitic radiating stub. The first stub includes a first conductive portion, an inverter, and a second conductive portion connected in sequence, with the end of the first conductive portion away from the inverter used to connect to the first signal line; the vertical projection of the parasitic radiating stub onto the second conductive portion overlaps with the second conductive portion.

[0026] In conjunction with the second aspect, in some feasible ways, the length of the parasitic radiating branch is 0.45 to 0.65 times λ2.

[0027] In conjunction with the second aspect, in some implementable embodiments, the antenna assembly further includes an isolator disposed on the substrate. The isolator is located between the monopole antenna and the dipole antenna.

[0028] In conjunction with the second aspect, in some feasible ways, the isolator is connected to the first ground wire.

[0029] In conjunction with the second aspect, in some feasible ways, the isolator is a U-shaped structure with the opening of the U-shaped structure facing the monopole antenna.

[0030] Thirdly, this application provides a network device. The network device includes a housing and an antenna assembly as described in either the first or second aspect above, the antenna assembly being disposed within the housing. Because the antenna assembly has excellent performance, the performance of the network device including the antenna assembly is correspondingly improved.

[0031] Regarding the beneficial effects of the second and third aspects, please refer to the description of any optional implementation method in the first aspect, which will not be repeated here. Based on the implementation methods provided in the above aspects, this application can also be further combined to provide more implementation methods. Attached Figure Description

[0032] Figure 1 is a schematic diagram of the structure of a communication system.

[0033] Figure 2 shows a usage scenario of a network device.

[0034] Figure 3 is an exploded view of an antenna assembly provided in an embodiment of this application.

[0035] Figure 4 is an exploded view of another antenna assembly provided in an embodiment of this application.

[0036] Figure 5 is an exploded structural diagram of the substrate, dipole antenna, and second feed line provided in the embodiment of this application.

[0037] Figure 6 is an exploded view of another antenna assembly provided in an embodiment of this application.

[0038] Figure 7 is an exploded view of another antenna assembly provided in an embodiment of this application.

[0039] Figure 8 shows the S-parameters of the antenna assembly in the 2GHz-7GHz frequency band.

[0040] Figure 9a shows the antenna radiation pattern of the antenna assembly in the 2.45 GHz band.

[0041] Figure 9b shows the antenna radiation pattern of the antenna assembly in the 5.2 GHz band.

[0042] Figure 9c shows the antenna radiation pattern of the antenna assembly in the 5.8 GHz band.

[0043] In the diagram: 10 - Network equipment; 100 - Antenna assembly; 110 - First feed line; 120 - Monopole antenna; 111 - First signal line; 112 - First ground line; 121 - First stub; 122 - Second stub; 123 - Main arm; 124 - First arm; 125 - Second arm; 126 - Parasitic radiating stub; 101 - First conductive part; 103 - Phase inverter; 102 - Second conductive part; 130 - Substrate; 131 - First surface; 132 - Second surface; 140 - Dipole antenna; 141 - Third stub; 142 - Fourth stub; 143 - Fifth stub; 150 - Second feed line; 151 - Second signal line; 152 - Second ground line Line; 301-First branch; 302-Second branch; 401-First main branch; 402-Second main branch; 303-Third branch; 304-Fourth branch; 305-Fifth branch; 306-Sixth branch; 160-Isolator; 200-Antenna assembly; 210-First feed line; 220-Second feed line; 230-Monopole antenna; 240-Dipole antenna; 211-First signal line; 212-First ground line; 221-Second signal line; 222-Second ground line; 241-First arm; 242-Second arm; 243-Third arm; 231-First stub; 232-Second stub; 233-Parasitic radiating stub; 250-Isolator. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0045] In the following description, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0046] Furthermore, in this application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0047] Antenna return loss: This can be understood as the ratio of the signal power reflected back to the antenna port after passing through the antenna circuit to the transmit power at the antenna port. The smaller the reflected signal, the larger the signal radiated into space through the antenna, and the higher the antenna's radiation efficiency. Conversely, the larger the reflected signal, the smaller the signal radiated into space through the antenna, and the lower the antenna's radiation efficiency.

[0048] Antenna return loss can be represented by the S11 parameter, which is one of the S-parameters. S11 represents the reflection coefficient, and this parameter characterizes the antenna's transmission efficiency.

[0049] In some embodiments, the S11 diagram can be understood as a schematic diagram representing the resonance generated by the antenna. In some embodiments, the resonance range shown in the S11 diagram within -4dB can be understood as the resonant frequency range generated by the antenna. The S11 parameter is usually negative. The smaller the S11 parameter, the smaller the antenna return loss, the less energy reflected back by the antenna itself, which means more energy actually enters the antenna, and the higher the system efficiency of the antenna; the larger the S11 parameter, the greater the antenna return loss, and the lower the system efficiency of the antenna.

[0050] Isolation: Isolation refers to the ratio of the signal received by one antenna through another to the signal received by the transmitting antenna. It's a physical quantity used to measure the degree of mutual coupling between antennas. Assuming two antennas form a two-port network, the isolation between them is represented by their S21 and S12 parameters. Antenna isolation can be expressed using S21 and S12 parameters, which are also types of S-parameters. S21 and S12 parameters are usually negative. Smaller S21 and S12 parameters indicate greater isolation and less mutual coupling between antennas; larger parameters indicate less isolation and greater mutual coupling. Antenna isolation depends on factors such as the antenna radiation pattern, the spatial distance between antennas, and antenna gain.

[0051] Communication band / operating band: Regardless of the type of antenna, it always operates within a certain frequency range (bandwidth). For example, an antenna that supports the B40 band operates within the frequency range of 2300MHz to 2400MHz, or in other words, the antenna's operating band includes the B40 band.

[0052] The resonant frequency range or resonant frequency band may be the same as or may partially overlap with the operating frequency band. In one embodiment, one or more resonant frequency bands of the antenna may cover one or more operating frequency bands of the antenna.

[0053] It should be noted that in engineering, an S11 value of -4dB is generally used as the standard. When the S11 value of an antenna is less than -4dB, the antenna is considered to be operating normally, or its transmission efficiency is considered to be good. It should be understood that in engineering, an S11 value of -6dB can also be used as the standard. When the S11 value of an antenna is less than -6dB, the antenna is considered to be operating normally, or its transmission efficiency is considered to be good.

[0054] Coupling can be understood as direct coupling or indirect coupling. "Coupled connection" can be understood as direct coupling connection and / or indirect coupling connection. Direct coupling can also be called "electrical connection," which can be understood as components physically contacting and conducting electricity; it can also be understood as the form of connection between different components in a circuit structure through physical lines that can transmit electrical signals, such as printed circuit boards (PCBs), copper foil, or wires. "Indirect coupling" can be understood as two conductors conducting electricity through a gap / non-contact method. In one embodiment, indirect coupling can also be called capacitive coupling, for example, signal transmission is achieved by forming an equivalent capacitance through coupling between the gaps between two conductive parts.

[0055] Antenna pattern: also known as radiation pattern. It refers to the graph showing the relative field strength (normalized modulus) of the antenna radiation field as a function of direction at a fixed distance from the low-frequency antenna. It is usually represented by two mutually perpendicular planar patterns passing through the direction of maximum radiation of the antenna.

[0056] Antenna radiation patterns typically have multiple radiating beams. The beam with the highest radiating intensity is called the main lobe, and the remaining beams are called side lobes. Among the side lobes, the side lobe in the opposite direction to the main lobe is also called the back lobe.

[0057] dB: This stands for decibel, a logarithmic concept with base 10. Decibels are used to evaluate the proportional relationship between two physical quantities; they themselves have no physical dimensions. For every 10-fold increase in the ratio between two quantities, their difference can be expressed as 10 dB. For example: A = 100, B = 10, C = 5, D = 1, then A / D = 20 dB; B / D = 10 dB; C / D = 7 dB; B / C = 3 dB. In other words, a 10 dB difference between two quantities is a 10-fold difference, a 20 dB difference is a 100-fold difference, and so on. A 3 dB difference is a 2-fold difference between the two quantities.

[0058] dBi: Usually mentioned together with dBd. dBi and dBd are units of power gain, both relative values, but with different reference points. The reference point for dBi is an omnidirectional antenna; the reference point for dBd is a dipole. Generally, dBi and dBd are considered to represent the same gain, but the value expressed in dBi is 2.15 dBi larger than that expressed in dBd. For example, for an antenna with a gain of 16 dBd, its gain converted to dBi is 18.15 dBi, generally ignoring the decimal places, hence 18 dBi.

[0059] Electric plane (E-plane): Also known as the E-plane, for linearly polarized antennas, the electric plane is the plane containing the electric field vector (also called the E-aperture) and the direction of maximum radiation. The electric field, or "E" plane, determines the polarization or direction of radio waves. For vertically polarized antennas, the E-plane typically coincides with the vertical / elevation plane. For horizontally polarized antennas, the E-plane typically coincides with the horizontal / azimuth plane. The E-plane and the H-plane should be 90 degrees apart.

[0060] Magnetic Plane (H-Plane): Also known as the H-plane, the magnetic plane is the plane containing the magnetic field vector (also called the H-aperture) and the direction of maximum radiation. In a linearly polarized antenna, the magnetizing field, or "H" plane, is perpendicular to the "E" plane. For vertically polarized antennas, the H-plane typically coincides with the horizontal / azimuth plane. For horizontally polarized antennas, the H-plane typically coincides with the vertical / elevation plane.

[0061] Operating bandwidth: The operating bandwidth of an antenna element refers to the frequency range in which it is effective. In engineering, the frequency band where the S11 parameter is less than -10dB or less than -5dB is usually referred to as the operating bandwidth.

[0062] The feed section, or feed terminal, is the combination of all components of an antenna used for receiving and transmitting radio frequency waves. In the case of a receiving antenna, the feed section can be considered as the antenna section from the first amplifier to the front-end transmitter. In a transmitting antenna, the feed section can be considered as the section after the last power amplifier.

[0063] Antenna pattern: also known as radiation pattern. It refers to the graph showing the relative field strength (normalized modulus) of the antenna radiation field as a function of direction at a fixed distance from the low-frequency antenna. It is usually represented by two mutually perpendicular planar patterns passing through the direction of maximum radiation of the antenna.

[0064] Antenna array: An antenna array consists of multiple identical (or different) antenna elements arranged according to a certain pattern. Controlled by a controller, the radiation pattern of the array antenna is controlled by the amplitude and phase of the current fed to each antenna element. This method is also known as beamforming. Beamforming achieved through a phased array antenna control system can obtain high gain in a directional manner or enable scanning of the array antenna beam.

[0065] Figure 1 is a schematic diagram of a communication system, which can also be called an optical transmission network. The communication system includes one or more network devices 10, which are used to communicate with user terminals.

[0066] A terminal can also be called a terminal device, user equipment (UE), mobile station (MS), mobile terminal (MT), or station (STA), etc.

[0067] In some embodiments, the terminal may be a mobile phone, tablet computer, computer with wireless transceiver function, personal communication service (PCS) telephone, desktop computer, virtual reality (VR) terminal device, augmented reality (AR) terminal device, wireless terminal in industrial control, wireless terminal in smart home, etc.

[0068] Network device 10 can be a routing and forwarding device with optical communication capabilities, such as a router or switch. Network device 10 can also be a broadband network gateway (BNG) or a broadband remote access server (BRAS) with optical communication capabilities.

[0069] The terminal can access the server using network device 10. In room 1 as shown in Figure 1, the user can use the terminal to establish a communication connection with network device 10 using wireless local area network (WLAN) technology, so that the terminal can send data packets to the server. The same applies to room 2 in Figure 1.

[0070] In some possible scenarios, the terminal may also use optical communication technology to establish a communication connection with the radio access network (RAN) (not shown in Figure 1) and access the server.

[0071] Network device 10 connects to the server wirelessly or via a wired connection. The embodiments of this application do not limit the number of terminal devices, network device 10, and servers included in the optical communication network.

[0072] For example, this application can be applied to fiber-to-the-room (FTTR) scenarios.

[0073] This embodiment uses a whole-house fiber optic scenario as an example to illustrate the bandwidth allocation method of the optical communication network provided in this application. The whole-house fiber optic scenario can be achieved through FTTR technology. FTTR refers to using optical fiber instead of network cables, laying optical fiber to every room, deploying optical network equipment 10 to interconnect with the home gateway, and combining it with dual-band Wi-Fi to ensure whole-house network coverage.

[0074] For example, network device 10 includes a housing and an antenna assembly 100 disposed within the housing. The antenna assembly 100 is used to receive and transmit signals. To complete communication across n frequency bands (n is a natural number greater than or equal to 2), n antennas operating in the corresponding frequency bands are required.

[0075] This application does not limit the usage scenarios of the network device 10. The network device 10 can be used for external antenna masts or built-in gateways.

[0076] Figure 2 illustrates a usage scenario for a network device 10. Referring to Figure 2, this network device 10 can be applied to multi-link operation. Both dual-band and tri-band multi-link operation can improve the communication rate of the entire communication system.

[0077] Taking multi-link operation in three frequency bands as an example, the three frequency bands can be the 2.4 GHz band, the 5.2 GHz band, and the 5.8 GHz band. If the 2.4 GHz band link is combined with either the 5.2 GHz band or the 5.8 GHz band link, then either the 5.2 GHz band or the 5.8 GHz band link needs to be combined with the 2.4 GHz band link. For example, in Figure 2, a combiner is used to combine the 2.4 GHz band and the 5.8 GHz band link.

[0078] Each link includes: a switch (SW), a power amplifier (PA), a low-frequency noise amplifier (LNA), a transmitting device (Tx), and a receiving device (Rx).

[0079] In this system, the uplink signal is received by the receiving device Rx, and the downlink signal is transmitted by the transmitting device Tx. When the receiving device Rx receives a signal, the switch sw is connected to the receiving device Rx; when the transmitting device Tx transmits a signal, the switch SW is connected to the transmitting device Tx.

[0080] It is understood that in some embodiments, antenna assembly 100 may be a dual-band antenna. For example, a dual-band antenna combining the 2.4 GHz band and the 5.8 GHz band.

[0081] The performance of the antenna assembly 100 directly affects the communication quality of the network device 10. The antenna assembly 100 provided in this application embodiment has excellent performance, which is beneficial to improving the communication quality of the network device 10.

[0082] Figure 3 is an exploded structural diagram of an antenna assembly 100 provided in an embodiment of this application. Referring to Figure 3, the antenna assembly 100 includes a first feed line 110 and a monopole antenna 120. The first feed line 110 is used to feed the monopole antenna 120. The monopole antenna 120 is used to radiate electromagnetic waves with a first center frequency and a second center frequency, the second center frequency being greater than the first center frequency. In some scenarios, the monopole antenna 120 can be referred to as a dual-fed antenna.

[0083] The first feeder line 110 includes a first signal line 111 and a first ground line 112.

[0084] The monopole antenna 120 includes a first stub 121 and a second stub 122, with the first stub 121 connected to a first signal line 111. Exemplarily, region A of the first signal line 111 and the first stub 121 is connected.

[0085] The second branch 122 includes a main arm 123, two primary arms 124, and two secondary arms 125. One end of each primary arm 124 is connected to the main arm 123, and one end of each secondary arm 125 is connected to the main arm 123. The main arm 123 is connected to the first ground wire 112. For example, region B of the main arm 123 is connected to the first ground wire 112.

[0086] The first arm 124 has a length of 0.35 to 0.55 times λ1, where λ1 is the wavelength of the dielectric waveguide corresponding to the first center frequency. The second arm 125 has a length of 0.45 to 0.65 times λ2, where λ2 is the wavelength of the dielectric waveguide corresponding to the second center frequency.

[0087] The end of the first ground wire 112 furthest from the main arm 123 is used for grounding, for example, for connecting to the ground layer or ground electrode of the network device.

[0088] Thus, the main arm 123, the first branch 121, and the two first arms 124 are primarily used to radiate electromagnetic waves at the first center frequency. The main arm 123, the first branch 121, and the two second arms 125 are primarily used to radiate electromagnetic waves at the second center frequency. The arrangement of the main arm 123, the two first arms 124, and the two second arms 125 allows for horizontal omnidirectional radiation in a monopole form, and also helps to improve the non-circular and tilted radiation patterns of the antenna assembly 100. Furthermore, the second branch 122 also helps to improve the balance of the feed current into the first feed line 110, thereby enhancing the performance of the antenna assembly 100.

[0089] In some embodiments of this application, the second branch 122 can be considered as a four-branch balun structure. In some embodiments, the first ground wire 112 is connected to the midpoint of the extension direction of the main arm 123. In other words, the first ground wire 112 is connected to the midpoint of the balun structure. In the example of FIG3, the first ground wire 112 is connected to region B of the main arm 123.

[0090] In the example of Figure 3, the two first arms 124 and the two second arms 125 are located on one side of the main arm 123, and the first stub 121 is located on the other side of the main arm 123. In this way, reducing the influence of the current on the first arms 124 and the second arms 125 on the first stub 121 is beneficial to improving the roundness of the radiation pattern of the antenna assembly 100.

[0091] In the embodiments of this application, the aforementioned "first center frequency" refers to the median of the first operating frequency band. The first operating frequency band is a communication frequency band that includes 2.4 GHz. For example, the first operating frequency band can be 2.4 GHz to 2.5 GHz.

[0092] The aforementioned "second center frequency" refers to the median of the second operating frequency band. The second operating frequency band is a communication band encompassing 5.2 GHz. For example, the second operating frequency band could be 5.15 GHz - 5.4 GHz. Alternatively, it could be 5.17 GHz - 5.33 GHz. Or, the second operating frequency band could be a communication band encompassing 5.8 GHz, for example, 5.7 GHz - 5.85 GHz. For example, it could be 5.735 GHz - 5.835 GHz.

[0093] In some embodiments, the first direction is perpendicular to the extension direction of the main arm. This is beneficial for increasing the gain of electromagnetic waves in the first operating frequency band.

[0094] The embodiments of this application do not limit the structure of the first feeder line 110. In Figure 3, the first feeder line 110 includes a conductor and an inner conductor, with an outer conductor disposed outside the inner conductor, and an insulating layer disposed between the outer conductor and the inner conductor. The first feeder line 110 can be regarded as a coaxial cable, with the inner conductor being the first signal line 111 and the outer conductor being the first ground line 112.

[0095] In some embodiments of this application, the length of the first arm 124 is 0.35-0.42 times λ1, and the length of the second arm 125 is 0.50-0.65 times λ2. Thus, the gain of the monopole antenna 120 is significantly improved, and the radiation pattern circularity is good.

[0096] For example, the length of the first arm 124 is 0.35 times λ1, 0.38 times λ1, 0.40 times λ1, 0.42 times λ1, 0.45 times λ1, 0.48 times λ1, 0.50 times λ1, 0.51 times λ1, 0.52 times λ1, or 0.55 times λ1, etc.

[0097] For example, the length of the second arm 125 is 0.45 times λ2, 0.48 times λ2, 0.50 times λ2, 0.52 times λ2, 0.55 times λ2, 0.58 times λ2, 0.60 times λ2, 0.62 times λ2, or 0.65 times λ2, etc.

[0098] In some embodiments of this application, the length of the second arm 125 is less than the length of the first arm 124.

[0099] This application does not limit the length of the main arm 123. Exemplarily, the length of the main arm 123 can be 0.22 times λ1 to 0.28 times λ1. For example, the length of the main arm 123 can be 0.22 times λ1, 0.23 times λ1, 0.24 times λ1, 0.25 times λ1, 0.26 times λ1, 0.27 times λ1, or 0.28 times λ1, etc.

[0100] The embodiments of this application do not limit the arrangement of the two primary arms 124 and the two secondary arms 125. In the example of Figure 3, the two primary arms 124 are respectively connected to the opposite ends of the main arm 123, and the two secondary arms 125 are disposed between the two primary arms 124. In this way, the space between the two primary arms 124 can be used to accommodate other components.

[0101] In some embodiments of this application, two secondary arms 125 are respectively connected to the opposite ends of the main arm 123, and two primary arms 124 are disposed between the two secondary arms 125. Alternatively, one primary arm 124 and one secondary arm 125 are respectively connected to the opposite ends of the main arm 123, and another primary arm 124 and another secondary arm 125 are connected to the middle of the main arm 123.

[0102] It is understood that, in the embodiments of this application, both first arms 124 and both second arms 125 can be connected to the middle of the main arm 123. In other words, the opposite ends of the main arm 123 can be open circuit ends, and the opposite ends of the main arm 123 can be not directly connected to other conductive structures.

[0103] In the example of Figure 3, the two first arms 124 are of equal length. It is understood that in some embodiments, the lengths of the two first arms 124 may not be equal; for example, the ratio of the lengths of the two first arms 124 may be 1 ± 0.06. Similarly, in some embodiments, the ratio of the lengths of the two second arms 125 may be 1 ± 0.06.

[0104] In the example of Figure 3, the extension path of the first arm 124 is a straight line. In some embodiments, the path of the first arm 124 can be a curve, or the first arm 124 can be L-shaped, etc.

[0105] In the example of Figure 3, the extension direction of the first arm 124 is the first direction. In some embodiments of this application, the extension direction of the first arm 124 can be other, for example, the first arm 124 extends in a direction away from the first branch 121.

[0106] Similarly, the extension path of the second arm 125 can be a straight line, a curve, an L-shape, etc. The second arm 125 extends in a direction away from the first branch 121. The extension direction of the second arm 125 can be the first direction.

[0107] In the embodiments of this application, the extension direction of the first arm 124 is parallel to the extension direction of the second arm 125. In other embodiments, where the first arm 124 and the second arm 125 do not contact each other, the extension directions of the first arm 124 and the second arm 125 may not be parallel.

[0108] In some embodiments of this application, to improve the gain of the monopole antenna 120, the monopole antenna 120 further includes a parasitic radiating stub 126. The parasitic radiating stub 126 is coupled to the first stub 121.

[0109] For example, the first stub 121 includes a first conductive portion 101, an inverter 103, and a second conductive portion 102 connected in sequence. The end of the first conductive portion 101 away from the inverter 103 is used to connect to the first signal line 111. The vertical projection of the parasitic radiating stub 126 onto the second conductive portion 102 overlaps with the second conductive portion 102. The parasitic radiating stub 126 and the second conductive portion 102 are coupled, and the distance from the parasitic radiating stub 126 to the second conductive portion 102 is less than the distance from the parasitic radiating stub 126 to the inverter 103.

[0110] In some scenarios, the inverter 103 can also be called an inductive inverter. The inverter 103 makes the currents in the corresponding operating frequency bands on the first conductive part 101, the second conductive part 102 and the parasitic radiating branch 126 approximately in phase.

[0111] The parasitic radiating branch 126 is excited and radiated by the radio frequency current coupled from the second conductive part 102, which can improve the gain and improve the shape of the radiation pattern.

[0112] The aforementioned "vertical projection of parasitic radiating branch 126 on the second conductive part 102" refers to the projection of the parasitic radiating branch 126 as a projection object on the surface of the second conductive part 102 along the thickness direction of the second conductive part 102.

[0113] Thus, the inverter 103 is used to reverse the phase of the electromagnetic wave at the first center frequency by 180°. Since the first and second center frequencies are not equal, the phase adjustment of the inverter 103 for the electromagnetic wave at the second center frequency is not 180°. This may result in poor performance of the inverter 103 in balancing phase adjustment for both the first and second center frequencies. The parasitic radiating stub 126 effectively corrects this problem to improve the gain of the monopole antenna 120.

[0114] In an embodiment of this application, the parasitic radiating branch 126 has a U-shaped structure, with the opening of the U-shaped structure facing away from the first branch 121. In other embodiments of this application, the parasitic radiating branch 126 can be of other shapes.

[0115] For example, the length of the parasitic radiating stub 126 is 0.45 to 0.65 times λ². Thus, the arrangement of the parasitic radiating stub 126 can significantly improve the gain of the electromagnetic wave at the second center frequency. For example, the length of the parasitic radiating stub 126 is 0.51 to 0.55 times λ². Thus, the parasitic radiating stub 126 can further improve the gain of the electromagnetic wave at the second center frequency.

[0116] For example, the length of parasitic radiating branch 126 is 0.45 times λ2, 0.48 times λ2, 0.50 times λ2, 0.51 times λ2, 0.53 times λ2, 0.55 times λ2, 0.58 times λ2, 0.60 times λ2, or 0.65 times λ2.

[0117] In Figure 3, the antenna assembly 100 may further include a substrate 130. All monopole antennas 120 are disposed on the substrate 130. The substrate 130 is used to support the monopole antennas 120.

[0118] For example, the material of the substrate 130 may include epoxy glass cloth laminate (FR-4), epoxy resin board, etc. The shape of the substrate 130 can be arbitrary, such as square plate, circular plate, elliptical plate, and irregular plate.

[0119] The substrate 130 includes a first surface 131 and a second surface 132 disposed opposite to each other. In the example of FIG3, parasitic radiating branches 126 are disposed on the second surface 132, and the first branches 121 and the second branches 122 are disposed on the first surface 131.

[0120] It is understood that in other embodiments of this application, the substrate 130 is not necessary, and the antenna assembly 100 can be supported by other structures. For example, the antenna assembly 100 can be disposed on the mid-frame or rear cover of the network device.

[0121] In embodiments of this application, the second branch 122 may be disposed on the second surface 132. Alternatively, a portion of the second branch 122 may be disposed on the second surface 132, and another portion of the second branch 122 may be disposed on the first surface 131, with the two portions connected by a conductive via penetrating the substrate 130.

[0122] In an embodiment where the antenna assembly 100 includes a substrate 130, the vertical projection of the parasitic radiating branch 126 on the first surface 131 overlaps with the vertical projection of the second conductive portion 102 on the first surface 131.

[0123] As shown in Figure 2 above, in some embodiments of this application, the antenna assembly 100 is a tri-band antenna, enabling network devices including the antenna assembly 100 to operate in tri-band multi-link mode.

[0124] The embodiments of this application do not limit the material of the monopole antenna 120. For example, the material of the monopole antenna 120 includes copper, aluminum, stainless steel, brass, gold foil, silver-plated copper, etc.

[0125] In some embodiments of this application, the antenna assembly 100 may also include a dipole antenna.

[0126] Figure 4 is an exploded view of another antenna assembly 100 provided in an embodiment of this application. The difference between Figure 4 and Figure 3 is that the antenna assembly 100 further includes a dipole antenna 140. The dipole antenna 140 is disposed on the substrate 130.

[0127] The dipole antenna 140 is used to radiate electromagnetic waves at a third center frequency, which is greater than the first center frequency and is greater than or less than the second center frequency.

[0128] For example, the third center frequency refers to the median of the third operating frequency band. The third operating frequency band is a communication band that includes 5.2 GHz. For example, the third operating frequency band could be 5.15 GHz - 5.4 GHz. Alternatively, the third operating frequency band is a communication band that includes 5.8 GHz. For example, the third operating frequency band could be 5.7 GHz - 5.85 GHz.

[0129] For example, the first operating frequency band is 2.4GHz-2.5GHz, the second operating frequency band is 5.15GHz-5.4GHz, and the third operating frequency band is 5.7GHz-5.85GHz. Alternatively, the first operating frequency band is 2.4GHz-2.5GHz, the second operating frequency band is 5.7GHz-5.85GHz, and the third operating frequency band is 5.15GHz-5.4GHz.

[0130] In this configuration, a first stub 121, a second stub 122, and a dipole antenna 140 are distributed along a first direction on the substrate 130. It is understood that the first direction can be any direction perpendicular to the thickness of the substrate 130, and can be configured according to the size and shape of the substrate 130. In other words, the first stub 121, the second stub 122, and the dipole antenna 140 are spaced apart along the first direction, with the second stub 122 located between the first stub 121 and the dipole antenna 140 in the first direction.

[0131] Thus, antenna assembly 100 can radiate electromagnetic waves at a first center frequency, a second center frequency, and a third center frequency. This expands the application scenarios of antenna assembly 100. For example, antenna assembly 100 can be used in a three-band MLO scenario.

[0132] In the example of Figure 4, the antenna assembly 100 also includes a second feed line 150. The second feed line 150 includes a second signal line 151 and a second ground line 152.

[0133] In the embodiments of this application, the second feeder line 150 may also be a coaxial cable. For a structural description of the second feeder line 150, please refer to the aforementioned description of the first feeder line 110; it will not be repeated here.

[0134] In the example of Figure 4, the dipole antenna 140 includes a third stub 141, a fourth stub 142, and a fifth stub 143. The fourth stub 142 is coupled to the third stub 141, and the third stub 141 is connected to the second signal line 151. The fifth stub 143 is connected to the second ground line 152; the fourth stub 142 is connected to the first ground line 112. For example, region C of the fourth stub 142 is connected to the first ground line 112.

[0135] The fourth branch 142 is not directly connected to the second signal line 151, nor is it directly connected to the second signal line 151 through any other conductive structure. The signal from the second signal line 151 is coupled to the fourth branch 142 through the third branch 141.

[0136] Because the fourth stub 142 is connected to the first ground wire 112, the fourth stub 142 can suppress the current on the first ground wire 112, reducing the interference of the first ground wire 112 on the current on the dipole antenna 140. This is beneficial for improving the gain of the antenna assembly 100 and optimizing the radiation pattern of the antenna assembly 100. The gain of the radiated signal at the first center frequency is significant.

[0137] For example, the fourth branch 142 and the first ground wire 112 are electrically connected by a solder layer or conductive adhesive. The fourth branch 142 and the first ground wire 112 may have one, two, three, or more connection points. In other words, the fourth branch 142 and the first ground wire 112 may be electrically connected at one or more locations.

[0138] In the example of Figure 4, the third branch 141 and the fifth branch 143 are located on the second surface 132. The fourth branch 142 is located on the first surface 131. Thus, the second feed line 150 is connected to the third branch 141 and the fifth branch 143 located on the second surface 132. The first feed line 110 is connected to the first branch 121 and the second branch 122 located on the first surface 131. The first feed line 110 and the second feed line 150 can avoid each other effectively, making efficient use of the space on the substrate 130.

[0139] In some embodiments of this application, a portion of the third branch 141 may be located on the first surface 131, and another portion of the third branch 141 may be located on the second surface 132. The aforementioned two portions of the third branch 141 are electrically connected through conductive vias penetrating the substrate 130. The fourth branch 142 and the fifth branch 143 are similarly described, and will not be repeated here.

[0140] In the example of Figure 4, the antenna assembly 100 is fed by two feed lines (first feed line 110 and second feed line 150). Improving the isolation of the electrical signals of the two feed lines can reduce the interference between the electromagnetic waves radiated by the dipole antenna 140 and the electromagnetic waves radiated by the monopole antenna 120, thereby optimizing the performance of the antenna assembly 100.

[0141] For the remaining structure in Figure 4, please refer to the description in Figure 3 above.

[0142] The embodiments of this application do not limit the shape of the third branch 141, the fourth branch 142 and the fifth branch 143, and can be set according to the space size of the substrate 130.

[0143] Figure 5 is an exploded view of the substrate 130, dipole antenna 140, and second feed line 150 provided in an embodiment of this application. Referring to Figure 5, the third branch 141 includes a first branch 301, a second branch 302, and a first main branch 401. One end of the first branch 301 and one end of the second branch 302 are both connected to the first main branch 401. The end of the first main branch 401 away from the first branch 301 is connected to the second signal line 151.

[0144] In the example of Figure 5, both the first branch 301 and the second branch 302 are L-shaped, and the first branch 301 and the second branch 302 are symmetrical about the extension direction of the first main branch 401. In some embodiments of this application, the third branch 141 can be Y-shaped.

[0145] The fourth branch 142 includes a second main branch 402, a third branch 303, a fourth branch 304, a fifth branch 305, and a sixth branch 306. One end of the third branch 303 and one end of the fourth branch 304 are connected to one end of the fourth branch 142. One end of the fifth branch 305 and one end of the sixth branch 306 are connected to the other end of the fourth branch 142.

[0146] In the example of Figure 5, the third branch 303, the fourth branch 304, the fifth branch 305, and the sixth branch 306 are all L-shaped. The third branch 303 and the fourth branch 304 are symmetrical about the extension direction of the second main branch 402. The fourth branch 304 and the fifth branch 305 are symmetrical about the extension direction of the second main branch 402. In some embodiments of this application, the fourth branch 142 can be I-shaped.

[0147] In the example of Figure 5, the second main branch 402 is connected to the second ground wire 152. In some embodiments of this application, the third branch 303, the fourth branch 304, the fifth branch 305, or the sixth branch 306 may be connected to the second ground wire 152.

[0148] In some embodiments, the third branch 141 and the fourth branch 142 can also be regarded as two H-shaped arrays.

[0149] In some embodiments, the vertical projection of the first main branch 401 on the first surface 131 and the vertical projection of the second main branch 402 on the first surface 131 overlap.

[0150] Thus, the first main branch 401 and the second main branch 402 can be regarded as a parallel double line. The second signal line 151 feeds the first branch 301, the second branch 302, the third branch 303, the fourth branch 304, the fifth branch 305 and the sixth branch 306 through this parallel double line, which can ensure the stability of the antenna assembly pattern.

[0151] In the example in Figure 5, the fifth branch 143 is M-shaped.

[0152] It is understood that in other embodiments of this application, the third branch 141, the fourth branch 142 and the fifth branch 143 are not limited to the shape shown in FIG5, and can be other shapes.

[0153] Figure 6 is an exploded structural diagram of another antenna assembly 100 provided in an embodiment of this application. The difference between Figure 6 and Figure 4 is that the antenna assembly 100 may further include a spacer 160, which is disposed on the substrate 130. Along the first direction, the spacer 160 is located between the second stub 122 and the dipole antenna 140.

[0154] Thus, the isolator 160 can reduce mutual interference between the dipole antenna 140 and the monopole antenna 120, and improve the isolation between them. This enables the antenna assembly 100 to have three operating frequency bands, while reducing adjacent channel interference and improving antenna performance.

[0155] For example, the isolator 160 can be considered as a quarter-wavelength resonator, the wavelength of which is 0.5 times the sum of the second center frequency and the third center frequency. This effectively reduces interference between electromagnetic waves at the second center frequency and electromagnetic waves at the third center frequency. For example, the total length of the isolator 160 is 0.22 times λ4 - 0.28 times λ4. λ4 = (λ2 + λ3) / 2. For example, the total length of the isolator 160 can be 0.22 times λ4, 0.23 times λ4, 0.24 times λ4, 0.25 times λ4, 0.26 times λ4, 0.27 times λ4, or 0.28 times λ4, etc.

[0156] The high isolation between the dipole antenna 140 and the monopole antenna 120 reduces the isolation requirements of the front-end filter, thus lowering the filter cost. In other words, the lower the isolation of the signal transmitted from the filter to the dipole antenna 140 or the monopole antenna 120, the lower the cost of the filter.

[0157] In the example of Figure 6, the spacer 160 is disposed on the first surface 131 of the substrate 130. In other embodiments, the spacer 160 may also be disposed on the second surface 132 of the substrate 130. Alternatively, a portion of the spacer 160 may be located on the first surface 131, and another portion may be located on the second surface 132. The portion located on the first surface 131 and the portion located on the second surface 132 are electrically connected through a conductive via.

[0158] In the embodiments of this application, the vertical projections of the dipole antenna 140 on the first surface 131 and the vertical projections of the isolator 160 on the first surface 131 do not overlap. Similarly, the vertical projections of the monopole antenna 120 and the isolator 160 on the first surface 131 do not overlap. This further improves the isolation effect of the isolator 160.

[0159] The isolator 160 and the dipole antenna 140 do not make contact, nor do the isolator 160 and the monopole antenna 120.

[0160] For example, the material of the insulating member 160 includes a conductive material. For instance, the material of the insulating member 160 includes copper, aluminum, stainless steel, brass, gold foil, silver-plated copper, etc.

[0161] In the embodiments of this application, the total length of the isolator 160 is 0.15 times λ3 to 0.35 times λ3, where λ3 is the wavelength of the dielectric waveguide corresponding to the third center frequency. For example, the total length of the isolator 160 is 0.15 times λ3, 0.18 times λ3, 0.19 times λ3, 0.2 times λ3, 0.21 times λ3, 0.22 times λ3, 0.25 times λ3, 0.28 times λ3, 0.3 times λ3, 0.31 times λ3, 0.32 times λ3, or 0.35 times λ3, etc. In this way, the isolator 160 can effectively reduce the crosstalk between the dipole antenna 140 and the monopole antenna 120. The isolator 160 can be regarded as a quarter-wavelength resonator of λ3.

[0162] This application embodiment does not limit the extension path of the isolation member 160. For example, the extension path can be a straight line, a broken line, a curve, or an irregular line. The aforementioned "total length of the isolation member 160" refers to the total length of the extension path of the isolation member 160.

[0163] In some embodiments of this application, the projection of the isolator 160 in the extension direction of the main arm 123 overlaps with the main arm 123. In other words, in a direction perpendicular to the extension direction of the main arm 123, the projection of the isolator 160 overlaps with the main arm 123. Thus, the isolator 160 can effectively reduce the interference of the second stub 122 on the dipole antenna 140.

[0164] In some embodiments of this application, the projection of the isolator 160 in the extension direction of the main arm 123 is located within the main arm 123. Alternatively, the projection of the isolator 160 in the extension direction of the main arm 123 is located between one end of the main arm 123 and the other end of the main arm 123. Thus, the isolator 160 can further reduce the interference of the second stub 122 on the dipole antenna 140.

[0165] In an embodiment where the two secondary arms 125 are connected to the opposite ends of the main arm 123, the spacer 160 is located between the two secondary arms 125 along the extension direction of the main arm 123. This allows the two secondary arms 125 to better avoid the spacer 160. The space of the substrate 130 can be fully utilized, reducing the space occupied by the antenna assembly 100.

[0166] In some embodiments of this application, a portion of the spacer 160 may be located outside the space enclosed by the two secondary arms 125.

[0167] In Figure 6, the isolator 160 has a U-shaped structure, with the opening of the U-shape facing the monopole antenna 120. In this way, the isolator 160 can further reduce the interference of the second stub 122 on the dipole antenna 140, which is beneficial for optimizing the radiation pattern of the antenna assembly 100.

[0168] In Figure 6, the two straight sides of the U-shaped structure are parallel to the first direction. This improves the gain of the antenna assembly 100 and reduces interference between the dipole antenna 140 and the monopole antenna 120.

[0169] In other embodiments of this application, the spacer 160 may be of other shapes, such as an L-shaped shape.

[0170] In some embodiments, the isolator 160 is connected to the first ground line 112. For example, region D on the isolator 160 is connected to the first ground line 112. Thus, the isolator 160 can suppress the current on the first ground line 112, reducing the impact and interference of this current on the dipole antenna 140. This improves the gain of the monopole antenna 120 and optimizes the radiation pattern of the antenna assembly 100.

[0171] For example, the isolator 160 is electrically connected to the first ground wire 112 via a solder layer or conductive adhesive. In some embodiments, the isolator 160 may have multiple electrical connection points to the first ground wire 112.

[0172] In some embodiments of this application, the isolator 160 is in contact with the first ground wire 112, and the isolator 160 can also suppress the current on the first ground wire 112.

[0173] In some embodiments, it is not necessary for the isolator 160 to be connected to the first ground wire 112, and the isolator 160 may not be connected to the first ground wire 112.

[0174] In some embodiments of this application, the second branch 122 may not adopt the structure shown in FIG3.

[0175] Figure 7 is an exploded structural diagram of another antenna assembly 200 provided in an embodiment of this application. The difference between Figure 7 and Figure 6 includes the different structures of the monopole antenna.

[0176] Referring to Figure 7, the antenna assembly 200 includes a substrate 130, a first feed line 210, a second feed line 220, a monopole antenna 230, and a dipole antenna 240. The substrate 130 includes a first surface 131 and a second surface 132 disposed opposite to each other. Both the monopole antenna 230 and the dipole antenna 240 are disposed on the substrate 130. The first feed line 210 is used to feed the monopole antenna 230. The monopole antenna 230 radiates electromagnetic waves at a first center frequency and an electromagnetic wave at a second center frequency. The second feed line 220 is used to feed the dipole antenna 240. The dipole antenna 240 radiates electromagnetic waves at a third center frequency.

[0177] The first feeder line 210 includes a first signal line 211 and a first ground line 212, and the second feeder line 220 includes a second signal line 221 and a second ground line 222.

[0178] The third center frequency is greater than the first center frequency, and the third center frequency is either greater than or less than the second center frequency. The first center frequency is less than the second center frequency.

[0179] The first center frequency, second center frequency, and third center frequency are the same as those in Figure 6 above, and will not be repeated here. Similarly, the first feeder line 210 and the second feeder line 220 are described in Figure 6 above.

[0180] In the example of Figure 7, the dipole antenna 240 includes a first arm 241, a second arm 242, and a third arm 243. The second arm 242 and the third arm 243 are coupled. The first arm 241 is connected to the second signal line 221, and the third arm 243 is connected to the second ground line 222. The second arm 242 is connected to the first ground line 212.

[0181] Thus, in the example of Figure 7, the connection between the second arm 242 and the first ground wire 212 helps to reduce the influence of the current on the first ground wire 212 on the dipole antenna 240. It also helps to improve the gain of the monopole antenna 230 and improve the radiation pattern of the antenna assembly 200.

[0182] For a description of the dipole antenna 240 in Figure 7, please refer to the description of the dipole antenna 140 in Figure 6 above. For the description of the first arm 241, please refer to the description of the third stub in Figure 6 above; for the description of the second arm 242, please refer to the description of the fourth stub in Figure 6 above; and for the description of the third arm 243, please refer to the description of the fifth stub in Figure 6 above.

[0183] In the example of Figure 7, the monopole antenna 230 includes a first stub 231 and a second stub 232. The first stub 231 is connected to the first signal line 211, and the second stub 232 is connected to the first ground line 212. For the description of the first stub 231, please refer to the description of the first stub 121 in Figure 6 above.

[0184] In the example of Figure 7, the shape of the second branch 232 is not limited. For example, in some embodiments, the second branch 232 is a two-branched balun structure.

[0185] In some embodiments of this application, the monopole antenna 230 may further include parasitic radiating stubs 233. The shape and location of the parasitic radiating stubs 233 are described in the preceding description of the parasitic radiating stub 126 in FIG. 6. It is understood that in some examples of the embodiment of FIG. 7, the parasitic radiating stubs 233 are not necessary and may be omitted.

[0186] In some embodiments, the antenna assembly 200 may further include an isolator 250 disposed on the substrate 130. For a description of the isolator 250, please refer to the description of the isolator in FIG. 6. It is understood that in some examples of the embodiment of FIG. 7, the isolator 250 is not necessary and may be omitted.

[0187] The antenna assembly provided in this application has advantages such as high gain, high isolation, and regular radiation pattern. It can effectively improve the communication quality of network devices.

[0188] The performance of the antenna assembly 100 shown in Figure 6 is described below with reference to Figures 8, 9a, 9b and 9c.

[0189] Figure 8 shows the S-parameter plot of the antenna assembly in the 2GHz-7GHz frequency band. In Figure 8, curve m1 is the S11 parameter curve of the antenna assembly, curve m2 is the S12 parameter curve, curve m3 is the S21 parameter curve, and curve m4 is the S22 parameter curve. Port 1 is the port connected to the first feed line. Port 2 is the port connected to the second feed line. The values ​​1-10 in Figure 8 refer to 10 points on the curves and the coordinates of each point on the S-parameter plot.

[0190] As shown in Figure 8: When parameter S11 is less than -10dB, it indicates impedance matching at port 1, therefore the operating frequency of the monopole antenna is 2.4GHz-2.5GHz and 5.17GHz-5.33GHz. Parameter S22 is less than -10dB, indicating impedance matching at port 2, therefore the operating frequency of the dipole antenna is 5.7GHz-5.835GHz. Curves m2 and m3 represent the isolation between port 1 and port 2. In the 2.4GHz-2.5GHz band, both parameters S21 and S12 are less than -20dB, indicating that the isolation between port 1 and port 2 is greater than 20dB in this band. In the 5.17GHz-5.33GHz band, both parameters S21 and S12 are less than -38dB, indicating that the isolation between port 1 and port 2 is greater than 38dB in this band. Within the 5.7GHz-5.835GHz frequency band, both the S21 and S12 parameters are less than -36dB, indicating that the isolation between port 1 and port 2 is greater than 36dB within the 5.7GHz-5.835GHz frequency band.

[0191] Figure 9a shows the antenna pattern of the antenna assembly in the 2.45 GHz band. Figure 9b shows the antenna pattern of the antenna assembly in the 5.2 GHz band. Figure 9c shows the antenna pattern of the antenna assembly in the 5.8 GHz band. As can be seen from Figures 9a, 9b, and 9c, the antenna exhibits high gain, good circularity, and good omnidirectional characteristics at frequencies of 2.45 GHz, 5.2 GHz, and 5.8 GHz.

[0192] In summary, the antenna assembly shown in Figure 6 can radiate electromagnetic waves at the first, second, and third center frequencies, achieving tri-frequency co-location, reducing the number of antennas, and improving integration. When used in WiFi 7 devices, this antenna assembly helps improve the stability of the WiFi 7 system's MLO (Mean Allocation). Furthermore, the antenna assembly in Figure 6 helps improve the gain of the monopole antenna and mitigates pattern warping and sidelobe issues. The isolator improves isolation between 5.2GHz and 5.8GHz, reduces filter performance requirements, and lowers costs. Connecting the first ground wire to the isolator and the fourth stub effectively suppresses current on the first ground wire, reducing interference from the first ground wire to the dipole antenna, while also improving the gain and pattern of the monopole antenna.

[0193] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0194] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An antenna assembly, characterized by The antenna assembly includes: The first feeder line includes a first signal line and a first ground line; and A monopole antenna is used to radiate electromagnetic waves with a first center frequency and a second center frequency, wherein the second center frequency is greater than the first center frequency. The monopole antenna includes a first stub and a second stub. The first stub is connected to the first signal line. The second stub includes a main arm, two first arms and two second arms. One end of each first arm is connected to the main arm, and one end of each second arm is connected to the main arm. The main arm is connected to the first ground line. Wherein, the length of the first arm is 0.35 times to 0.55 times λ1, where λ1 is the dielectric waveguide wavelength corresponding to the first center frequency; the length of the second arm is 0.45 times to 0.65 times λ2, where λ2 is the dielectric waveguide wavelength corresponding to the second center frequency.

2. The antenna assembly of claim 1, wherein, The two first arms are respectively connected to the opposite ends of the main arm, and the two second arms are disposed between the two first arms.

3. The antenna assembly of claim 1 or 2, wherein, The monopole antenna also includes parasitic radiating stubs; The first stub includes a first conductive part, an inverter, and a second conductive part connected in sequence. The end of the first conductive part away from the inverter is used to connect the first signal line. The vertical projection of the parasitic radiating stub on the second conductive part overlaps with the second conductive part.

4. The antenna assembly of claim 3, wherein, The length of the parasitic radiating branch is 0.45 to 0.65 times λ2.

5. The antenna assembly of any of claims 1-4, wherein, The antenna assembly further includes: a dipole antenna for radiating electromagnetic waves at a third center frequency, wherein the third center frequency is greater than the first center frequency, and the third center frequency is greater than or less than the second center frequency; The antenna assembly further includes: a substrate, wherein both the dipole antenna and the monopole antenna are disposed on the substrate; On the substrate, the first stub, the second stub, and the dipole antenna are distributed along a first direction.

6. The antenna assembly of claim 5, wherein, The antenna assembly further includes: a second feed line, the second feed line including a second signal line and a second ground line; The dipole antenna includes a third stub, a fourth stub, and a fifth stub. The fourth stub is coupled to the third stub, and the third stub is connected to the second signal line. The fifth stub is connected to the second ground line, and the fourth stub is connected to the first ground line.

7. The antenna assembly of claim 5 or 6, wherein, The antenna assembly further includes: an isolator disposed on the substrate; Along the first direction, the isolator is located between the second stub and the dipole antenna.

8. The antenna assembly of claim 7, wherein, The projection of the isolator in the extension direction of the main arm overlaps with the main arm.

9. The antenna assembly of claim 7 or 8, wherein, The isolator is connected to the first ground wire.

10. The antenna assembly according to any one of claims 7-9, characterized in that, The isolator is a U-shaped structure, with the opening of the U-shaped structure facing the monopole antenna.

11. The antenna assembly according to any one of claims 5-10, characterized in that, The first direction is perpendicular to the extension direction of the main arm.

12. An antenna assembly, characterized in that, The antenna assembly includes: substrate; A monopole antenna is disposed on the substrate for radiating electromagnetic waves with a first center frequency and a second center frequency, wherein the first center frequency is less than the second center frequency. The first feed line includes a first signal line and a first ground line, used to feed the monopole antenna; The second feeder line includes a second signal line and a second ground line; and A dipole antenna is disposed on the substrate for radiating electromagnetic waves at a third center frequency, wherein the third center frequency is greater than the first center frequency and the third center frequency is greater than or less than the second center frequency. The dipole antenna includes a first arm, a second arm, and a third arm. The second arm is coupled to the first arm, and the first arm is connected to the second signal line. The third arm is connected to the second ground line. The second arm is connected to the first ground wire.

13. The antenna assembly according to claim 12, characterized in that, The antenna assembly further includes: an isolator disposed on the substrate; the isolator is located between the monopole antenna and the dipole antenna.

14. The antenna assembly according to claim 13, characterized in that, The isolator is connected to the first ground wire.

15. A network device, characterized in that, The network device includes a housing and an antenna assembly as described in any one of claims 1-14, the antenna assembly being disposed within the housing.

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