Tri-band antenna assembly and fiber-to-the-room access device

Abstract

The embodiments of the present application relate to the technical field of antennas. Disclosed are a tri-band antenna assembly and a fiber-to-the-room access device. The present application aims to improve the level of integration of antennas, and the specific solution comprises: the tri-band antenna assembly comprises a substrate, a spacer, a first dipole antenna, a second dipole antenna, and a first antenna. The first dipole antenna and the second dipole antenna share a slot. The first dipole antenna and the second dipole antenna share a feed line. The vertical projection of the spacer on the substrate is located between the slot and the first antenna. The spacer comprises a U-shaped member and an L-shaped member. The tri-band antenna assembly integrates antennas of three bands, has a high level of integration, and can cover all bands of a WLAN, thereby improving the use bandwidth and adaptation performance of the tri-band antenna assembly. The present invention can be used in FTTR scenarios.

Description

A tri-band antenna assembly and fiber-to-the-room access device

[0001] This application claims priority to Chinese Patent Application No. 202421639314.1, filed on July 11, 2024, entitled "A Three-Band Antenna Assembly and Fiber to the Room Access 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 a three-band antenna assembly and a fiber-to-the-room access device. Background Technology

[0003] Wireless local area networks (WLANs) are widely used in homes, offices, and other indoor / outdoor environments. In multi-link operation (MLO) scenarios, multiple frequencies operate and connect simultaneously during communication between the wireless communication system and the terminal, greatly improving communication stability and throughput. MLO requires multiple antennas operating in corresponding frequency bands, thus increasing the number and complexity of antennas.

[0004] Improving antenna integration is a pressing issue that needs to be addressed in multi-link operation scenarios.

[0005] Utility Model Content

[0006] This application provides a three-band antenna assembly and a fiber-to-the-room access device, aiming to improve the integration of the antenna.

[0007] To achieve the above objectives, this application adopts the following technical solution.

[0008] In a first aspect, embodiments of this application provide a three-band antenna assembly. The three-band antenna assembly includes a substrate, a first dipole antenna, a second dipole antenna, a first feed line, a first antenna, a second feed line, and a first isolator. The first dipole antenna is disposed on the substrate. The first dipole antenna includes a first stub and a second stub, with a gap between the first stub and the second stub. The second dipole antenna is disposed on the substrate. The second dipole antenna includes a third stub and a fourth stub, and the gap extends between the third stub and the fourth stub. The first feed line is used to feed the first dipole antenna and the second dipole antenna. The first antenna is disposed on the substrate. The second feed line is used to feed the first antenna, and the end of the second feed line connected to the first antenna is a connection end. The first isolator is disposed on the substrate. The vertical projection of the first isolator on the substrate is located between the gap and the connection end. The difference between any one of the center frequencies of the first antenna and the second dipole antenna and the center frequency of the first dipole antenna is greater than the difference between the center frequencies of the first antenna and the second dipole antenna.

[0009] Thus, this three-band antenna assembly integrates three antennas, enabling it to operate at multiple frequency bands and improving the integration of multiple antennas. Furthermore, compared to the center frequency of the first dipole antenna, the center frequency of the second dipole antenna is closer to that of the first antenna. Therefore, the signals from the second dipole antenna and the first antenna are more prone to mutual interference. The first isolator, vertically projected between the slot and the connection end of the second dipole antenna, effectively reduces the aforementioned interference and improves the isolation between the second dipole antenna and the first antenna. This allows the three-band antenna assembly to operate at three frequency bands while reducing adjacent channel interference, improving antenna performance. Additionally, compared to setting up three antennas independently, integrating the three frequency bands into a three-band antenna assembly is more beneficial for multi-link operation.

[0010] In conjunction with the first aspect, in some feasible embodiments, the vertical projection of any one of the first, second, third, and fourth branches onto the substrate does not overlap with the vertical projection of the first isolator onto the substrate. This is beneficial for further improving the isolation of the first isolator from the second dipole antenna and the first antenna.

[0011] In conjunction with the first aspect, in some feasible implementations, the total length of the first isolator is 0.15 times λ1 to 0.35 times λ1, where λ1 is the dielectric waveguide wavelength corresponding to the center frequency of the first antenna. Thus, the first isolator can be considered as a quarter-wavelength resonator of λ1, reducing crosstalk between the first antenna and the second dipole antenna.

[0012] In conjunction with the first aspect, in some feasible embodiments, the tri-band antenna assembly further includes a second isolator disposed on the substrate. This second isolator is not in contact with the first isolator, and its vertical projection onto the substrate lies between the slot and the connection end. Thus, the second and first isolators together improve the isolation between the second dipole antenna and the first antenna.

[0013] In conjunction with the first aspect, in some feasible implementations, the total length of the second isolator is 0.15 times λ2 to 0.35 times λ2, where λ2 is the dielectric waveguide wavelength corresponding to the center frequency of the second dipole antenna. Thus, the second isolator can be considered as a quarter-wavelength resonator of λ2, reducing crosstalk between the first antenna and the second dipole antenna.

[0014] In conjunction with the first aspect, in some feasible embodiments, the second isolator is a U-shaped element with its opening direction perpendicular to the slot and its opening direction opposite to the slot. Thus, the U-shaped element with its opening direction opposite to the slot helps reduce crosstalk between the first antenna and the second dipole antenna.

[0015] In conjunction with the first aspect, in some feasible embodiments, the first spacer includes a connected first straight arm and a second straight arm, the first straight arm and the second straight arm being perpendicular to each other; the first straight arm is parallel to the gap. Thus, the L-shaped first spacer has excellent isolation.

[0016] In conjunction with the first aspect, in some feasible arrangements, the U-shaped member and the second straight arm are both located on the same side of the first straight arm. This positional relationship can improve the isolation between the second and first spacers.

[0017] In conjunction with the first aspect, in some feasible arrangements, the U-shaped member and the first straight arm are both located on the same side of the second straight arm. This positional relationship can improve the isolation between the second and first spacers.

[0018] In conjunction with the first aspect, in some feasible implementations, the number of the first dipole antennas is two, and the number of the second dipole antennas is two. A gap is provided between one of the first dipole antennas and one of the second dipole antennas, with the gap closest to the connection end being the first gap. The vertical projection of the first isolator on the substrate lies between the first gap and the connection end. This is beneficial for improving gain.

[0019] In conjunction with the first aspect, in some feasible embodiments, the first feed line and the second feed line are respectively disposed on opposite sides of the substrate. This provides a larger distribution space for the first feed line and the second feed line, which is beneficial for antenna structure design.

[0020] In conjunction with the first aspect, in some feasible implementations, the first antenna is a dipole antenna; or, the first antenna is a monopole antenna. The three-band antenna assembly provided in the embodiments of this application is applicable to different types of first antennas.

[0021] Secondly, embodiments of this application provide a fiber-to-the-room access device. The fiber-to-the-room access device includes a housing and any of the three-band antenna assemblies provided in the first aspect. The housing encloses a mounting cavity, and the three-band antenna assembly is disposed within the mounting cavity. Because the three-band antenna assembly has high integration and excellent isolation, it helps to reduce the size of the fiber-to-the-room access device and improve its communication performance. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the structure of the optical communication network provided in an embodiment of this application.

[0023] Figure 2 is a schematic diagram of the structure of the three-band antenna assembly provided in the embodiment of this application.

[0024] Figure 3 is a distribution diagram of various components on the first and second surfaces provided in the embodiments of this application.

[0025] Figure 4 shows the relationship between the first separator, the connecting end, and the gap projected vertically onto the first surface.

[0026] Figure 5 is a schematic diagram of the structure of the first and second isolation components provided in the embodiments of this application.

[0027] Figure 6 is a schematic diagram of the structure of the first feeder wire provided in an embodiment of this application.

[0028] Figure 7 is an enlarged schematic diagram of point F1 in Figure 3.

[0029] Figure 8 is an enlarged schematic diagram of point F2 in Figure 3.

[0030] Figure 9 is another distribution diagram of the components on the first and second surfaces provided in the embodiments of this application.

[0031] Figure 10 shows the S-parameters of the three-band antenna assembly in the 2.3GHz-2.6GHz frequency band.

[0032] Figure 11 shows the S-parameters of the three-band antenna assembly in the 5.0 GHz-6.0 GHz frequency band.

[0033] Figure 12 shows the antenna radiation pattern of the three-band antenna assembly in the 2.4 GHz band.

[0034] Figure 13 shows the antenna radiation pattern of the three-band antenna assembly in the 5.2 GHz band.

[0035] Figure 14 shows the antenna radiation pattern of the three-band antenna assembly in the 5.8 GHz band.

[0036] In the diagram: 100 - Tri-band antenna assembly; 101 - First dipole antenna; 102 - Second dipole antenna; 103 - First antenna; 211 - Outer conductor; 212 - Inner conductor; 110 - Substrate; 111 - First surface; 112 - Second surface; 200 - Slot; 210 - First feed line; 220 - Second feed line; 230 - Connector; 201 - First stub; 202 - Second stub; 203 - Third stub; 204 - Fourth stub; 301 - First L-shaped microstrip line; 302 - Second L-shaped microstrip line; 303- First straight microstrip line; 304- Second straight microstrip line; 401- Feed section; 402- First monopole arm; 403- Phase inverter; 404- Second monopole arm; 405- First oscillator arm; 406- Second oscillator arm; 407- Third oscillator arm; 408- Fourth oscillator arm; 120- First isolator; 121- First straight arm; 122- Second straight arm; 130- Second isolator; 409- First microstrip line; 410- Second microstrip line; 030- First slot. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] Antenna return loss can be expressed as S 11 To represent by parameters, S 11 It belongs to one type of S-parameter. 11 The reflection coefficient is a parameter that characterizes the efficiency of an antenna's transmission.

[0040] In some embodiments, the characterization S can be... 11 The diagram is interpreted as a schematic representation of the resonance produced by the antenna. In some embodiments, S is characterized 11 The resonance shown in the figure, in the portion less than -10dB, can be interpreted as the resonant frequency range generated by the antenna. 11 The parameter is usually negative, S 11 The smaller the parameter, the lower the antenna return loss, the less energy the antenna reflects back, which means more energy actually enters the antenna, and the higher the system efficiency; S11 The larger the parameter, the greater the antenna return loss and the lower the antenna system efficiency.

[0041] 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.

[0042] It should be noted that in engineering, S is generally used. 11 The value is -8dB as the standard, when the S of the line 11 When the value is less than -8dB, the antenna can be considered to be working normally, or its transmission efficiency can be considered to be good. It should be understood that, in engineering practice, S is generally used as a benchmark. 11 A value of -10dB is used as the standard for the S value of the day line. 11 When the value is less than -10dB, the antenna can be considered to be working normally, or the antenna can be considered to have good transmission efficiency.

[0043] Isolation: Isolation is 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 the two antennas is S_interval between them. 21 S 12 Antenna isolation can be expressed as S. 21 S 12 Parameter representation. S 21 S 12 The parameter is usually negative. S 21 S 12 The smaller the parameter, the greater the isolation between antennas and the smaller the mutual coupling between antennas; S 21 S 12 A larger parameter indicates lower isolation between antennas and greater mutual coupling. Antenna isolation depends on factors such as antenna radiation pattern, spatial distance between antennas, and antenna gain.

[0044] The feed section is the combination of all components of an antenna used for receiving and transmitting radio frequency (RF) waves. In the case of a receiving antenna, the feed section can be considered the antenna section from the first amplifier to the front-end transmitter. In a transmitting antenna, the feed section can be seen as the section after the last power amplifier. In some cases, the term "feed section" is narrowly interpreted as the RF chip, or the transmission path including the RF chip to the feed point on the radiator or transmission line. The feed unit has the function of converting radio waves into electrical signals and sending them to the receiver components. Generally, it is considered part of the antenna used to convert radio waves into electrical signals and vice versa. Antenna design should consider the maximum power transfer possibility and efficiency. For this purpose, the antenna feed impedance must be matched with the load resistance. The antenna feed impedance is a combination of resistance, capacitance, and inductance. To ensure maximum power transfer conditions, the two impedances (load resistance and feed impedance) should be matched. Matching can be achieved by considering frequency requirements and antenna design parameters such as gain, directivity, and radiation efficiency.

[0045] 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.

[0046] 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.

[0047] 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 decibels. 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-decibel difference between two quantities is a 10-fold difference, a 20-decibel difference is a 100-fold difference, and so on. A 3-decibel difference is a 2-fold difference between the two quantities.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Medium wavelength: Due to the presence of a medium, the electromagnetic parameters of the medium (e.g., dielectric constant and permeability) are different from those in a vacuum. The propagation speed of electromagnetic waves in a medium is different from that in a vacuum, that is, their wavelengths are different. The propagation wavelength in a medium is called the medium wavelength.

[0052] Figure 1 is a schematic diagram of the structure of an optical communication network provided in an embodiment of this application. This optical communication network can also be called an optical transmission network. The optical communication network includes multiple network devices, one or more of which are used to connect to user terminals. A terminal can also be called a terminal device, user equipment (UE), mobile station (MS), mobile terminal (MT), or station (STA), etc.

[0053] 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.

[0054] Network devices can be routing and forwarding devices with optical communication capabilities, such as routers or switches. Network devices can also be broadband network gateways (BNGs) or broadband remote access servers (BRASs) with optical communication capabilities.

[0055] Terminals can access the server using network devices. In room 1 as shown in Figure 1, users can use their terminals to establish a communication connection with the network devices using wireless-fidelity (WIFI) technology, enabling the terminals to send data packets to the server. The same applies to room 2 in Figure 1. For example, the network devices communicate with each terminal via WIFI, and the network devices are interconnected via fiber optic cables.

[0056] 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.

[0057] Network devices connect to the server wirelessly or via wired connections. The embodiments of this application do not limit the number of terminal devices, network devices, and servers included in the optical communication network.

[0058] For example, this application can be applied to fiber-to-the-room (FTTR) scenarios.

[0059] 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. A whole-house fiber optic scenario can be achieved through FTTR technology. FTTR refers to a networking technology that uses optical fiber instead of network cables, laying optical fiber to every room, deploying optical network equipment to interconnect with the home gateway, and combining it with wireless communication to ensure whole-house network coverage.

[0060] In the embodiments of this application applied to fiber-to-the-room, the aforementioned network device can be a fiber-to-the-room access device.

[0061] For example, the network device includes a housing and a tri-band antenna assembly, the housing enclosing a mounting cavity, and the tri-band antenna assembly disposed within the mounting cavity. The tri-band antenna assembly is used for receiving and transmitting signals.

[0062] In scenarios where multiple frequencies operate simultaneously, such as in multi-link operation (MLO) scenarios, multiple frequencies work and connect simultaneously during communication between the wireless communication system and the terminal, greatly improving communication stability and throughput.

[0063] To achieve communication across n frequency bands (where n is a natural number greater than or equal to 2), n antennas operating in the corresponding frequency bands are required, significantly increasing the number and complexity of antennas in network equipment. While integrating antennas across multiple frequency bands can improve the integration level of network equipment, the problem of crosstalk between antennas in multiple frequency bands also becomes increasingly apparent.

[0064] The three-band antenna assembly provided in this application integrates antennas of multiple frequency bands, which improves the integration level and reduces crosstalk between antennas.

[0065] Figure 2 is a schematic diagram of the structure of a three-band antenna assembly 100 provided in an embodiment of this application. Referring to Figure 2, the three-band antenna assembly 100 includes a substrate 110, a first dipole antenna 101, a second dipole antenna 102, a first antenna 103, a first feed line 210, and a second feed line 220. The first dipole antenna 101, the second dipole antenna 102, and the first antenna 103 are all disposed on the substrate 110. The first feed line 210 is used to feed the first dipole antenna 101 and the second dipole antenna 102, and the second feed line 220 is used to feed the first antenna 103.

[0066] For example, the substrate 110 can be an insulating board or a plate with a certain dielectric constant. In one embodiment, the substrate 110 can be a circuit board, such as a printed circuit board (PCB). For example, the substrate 110 can also include an epoxy glass cloth laminate (FR-4), an epoxy resin board, etc. The shape of the substrate 110 can be arbitrary, such as a square plate, a circular plate, an elliptical plate, and an irregularly shaped plate.

[0067] The substrate 110 has a first surface 111 and a second surface 112 disposed opposite to each other. In the embodiments of this application, the first dipole antenna 101 may be disposed on the first surface 111 or the second surface 112, or a portion of the structure of the first dipole antenna 101 may be disposed on the first surface 111 and a portion of the structure may be disposed on the second surface 112. The second dipole antenna 102 and the first antenna 103 are disposed similarly. In other words, the embodiments of this application do not limit the distribution relationship of the first dipole antenna 101, the second dipole antenna 102, and the first antenna 103 on the first surface 111 and the second surface 112.

[0068] In the embodiments of this application, the difference between the center frequency of either the first antenna 103 or the center frequency of the second dipole antenna 102 and the center frequency of the first dipole antenna 101 is greater than the difference between the center frequencies of the first antenna 103 and the second dipole antenna 102. In other words, the difference between the center frequencies of the first dipole antenna 101 and the first antenna 103 is greater than the difference between the center frequencies of the first antenna 103 and the second dipole antenna 102. Furthermore, the difference between the center frequencies of the first dipole antenna 101 and the second dipole antenna 102 is greater than the difference between the center frequencies of the first antenna 103 and the second dipole antenna 102. It is understood that the aforementioned differences are positive numbers; if the difference is negative, the absolute value of the negative number is taken.

[0069] The aforementioned "center frequency" refers to the median of the antenna's operating frequency band.

[0070] In this embodiment, the center frequencies of the first dipole antenna 101, the second dipole antenna 102, and the first antenna 103 are not limited, but are set according to the working scenario of the three-band antenna assembly 100.

[0071] For example, the first dipole antenna 101 operates in a communication frequency band including 2.4 GHz. For instance, the operating frequency band of the first dipole antenna 101 can be 2.4 GHz to 2.5 GHz. The second dipole antenna 102 operates in a communication frequency band including 5.2 GHz; for example, the operating frequency band of the second dipole antenna 102 is 5.15 GHz to 5.4 GHz. The first antenna 103 operates in a communication frequency band including 5.8 GHz; for example, the operating frequency band of the first antenna 103 is 5.7 GHz to 5.85 GHz. Thus, the three-band antenna assembly can cover all frequency bands of the WLAN, thereby improving the bandwidth and adaptability of the three-band antenna assembly and communication equipment. This can improve the throughput performance and stability of the three-band antenna assembly 100.

[0072] In some embodiments, the second dipole antenna 102 operates in the frequency band of 5.15 GHz to 5.85 GHz, and the first antenna 103 operates in the frequency band of 5.925 GHz to 7.125 GHz.

[0073] Alternatively, in some embodiments, the operating frequency bands of the second dipole antenna 102 and the first antenna 103 can be interchanged. This application embodiment uses the example of the second dipole antenna 102 operating in a communication frequency band including 5.2 GHz and the first antenna 103 operating in a communication frequency band including 5.8 GHz for illustrative purposes.

[0074] In the example of Figure 2, the first dipole antenna 101 and the second dipole antenna 102 are disposed on the first surface 111, and the first antenna 103 is disposed on the second surface 112. This makes efficient use of both surfaces of the substrate 110, resulting in a more compact tri-band antenna assembly 100. Furthermore, both the first dipole antenna 101 and the second dipole antenna 102 are fed by the first feed line 210, and the first dipole antenna 101 and the second dipole antenna 102 are disposed on the same surface, simplifying the wiring of the first feed line 210.

[0075] In some embodiments, the first antenna 103 is a dipole antenna. In some embodiments, the first antenna 103 is a monopole antenna.

[0076] Figure 3 is a distribution diagram of various components on the first surface 111 and the second surface 112 provided in an embodiment of this application. Referring to Figure 3, the first dipole antenna 101 includes a first stub 201 and a second stub 202, with a gap 200 between the first stub 201 and the second stub 202. Similarly, the second dipole antenna 102 includes a third stub 203 and a fourth stub 204; the gap 200 extends between the third stub 203 and the fourth stub 204. In other words, the first dipole antenna 101 and the second dipole antenna 102 share the gap 200. Alternatively, the gap 200 can be viewed as follows: a portion is located between the first stub 201 and the second stub 202, and another portion is located between the third stub 203 and the fourth stub 204.

[0077] The width of the slit 200 is not limited in this embodiment. The coupling capacitance between the first dipole antenna 101 and the second dipole antenna 102 can be adjusted by setting the width of the slit 200.

[0078] The end of the second feed line 220 that connects to the first antenna 103 is the connection end 230. In other words, the connection end 230 of the second feed line 220 is directly connected to the first antenna 103. In some embodiments, the connection end 230 can be regarded as the feed end of the first antenna 103.

[0079] In some embodiments of this application, the tri-band antenna assembly 100 may further include a first isolator 120. The first isolator 120 is disposed on the substrate 110, and the vertical projection of the first isolator 120 on the substrate 110 is located between the slot 200 and the connection end 230.

[0080] The aforementioned "vertical projection of the first spacer 120 on the substrate 110" refers to the projection of the first spacer 120 onto the substrate 110 in a direction perpendicular to the surface of the substrate 110. The rest of the descriptions of "vertical projection" in this document are similar. It is understood that the vertical projection of the first spacer 120 onto the substrate 110 and the vertical projection of the first spacer 120 onto the first surface 111 have the same shape and size.

[0081] The vertical projection of the first spacer 120 on the substrate 110 is located between the gap 200 and the connection end 230. This means that, in embodiments where the gap 200 and the connection end 230 are on the same surface of the substrate 110, the projection of the first spacer 120 on that surface of the substrate 110 is located between the gap 200 and the connection end 230. In embodiments where the gap 200 and the connection end 230 are on different surfaces of the substrate 110, on the same surface of the substrate 110, the vertical projection of the first spacer 120 is located between the vertical projection of the gap 200 and the vertical projection of the connection end 230.

[0082] Figure 4 shows the relationship between the first spacer, the connecting end, and the gap projected vertically onto the first surface 111. Referring to Figure 4, the vertical projection of the connecting end onto the first surface 111 is region B. The vertical projection of the gap onto the first surface 111 is region C.

[0083] Region A exists between region C and region B along a direction perpendicular to the direction of the gap extension. The vertical projection of the first separator onto the first surface 111 is region D, which lies within region A.

[0084] It is understood that region B in Figure 4 is merely an example of the location of the vertical projection of the connecting end on the first surface 111, and does not restrict the shape of the vertical projection of the connecting end on the first surface 111 to the shape shown in region B. Similarly, region C in Figure 4 is merely an example of the location of the vertical projection of the gap on the first surface 111, and does not restrict the shape of the vertical projection of the gap on the first surface 111 to the shape shown in region C.

[0085] Compared to the center frequency of the first dipole antenna 101, the center frequency of the second dipole antenna 102 is closer to the center frequency of the first antenna 103. Therefore, the signals from the second dipole antenna 102 and the first antenna 103 are more prone to mutual interference. The first isolator 120, with its vertical projection located between the slot 200 and the connection end 230 of the second dipole antenna 102, can effectively reduce the aforementioned interference and improve the isolation between the second dipole antenna 102 and the first antenna 103. This allows the tri-band antenna assembly 100 to have three operating frequency bands, while reducing adjacent channel interference and improving antenna performance. Furthermore, compared to setting three antennas independently, integrating the three frequency bands into the tri-band antenna assembly 100 is more beneficial for multi-link operation. It also helps reduce the performance requirements of devices such as RF front-end filters and duplexers.

[0086] In the embodiments of this application, the first isolator 120 may be disposed on the first surface 111 of the substrate 110 or on the second surface 112 of the substrate 110. Alternatively, a portion of the first isolator 120 may be located on the first surface 111, and another portion may be located on the second surface 112 of the substrate 110, with the portion on the first surface 111 and the portion on the second surface 112 electrically connected through a conductive via. Furthermore, the first isolator 120 may be located on the same surface of the substrate 110 as the second dipole antenna 102, and the first isolator 120 may be located on the same surface of the substrate 110 as the first antenna 103; this embodiment of the application does not impose any limitations on this.

[0087] In some embodiments of this application, the vertical projection of any one of the first branch 201, the second branch 202, the third branch 203, and the fourth branch 204 onto the substrate 110 does not overlap with the vertical projection of the first spacer 120 onto the substrate 110. Thus, the first spacer 120 provides better isolation.

[0088] It is understood that, in some embodiments of this application, based on the condition that the vertical projection of the first isolation member 120 is located between the vertical projection of the gap 200 and the vertical projection of the connecting end 230, the vertical projections of some branches of the first branch 201, the second branch 202, the third branch 203 and the fourth branch 204 on the substrate 110 may overlap with the vertical projection of the first isolation member 120 on the substrate 110.

[0089] In some embodiments of this application, the first isolator 120 includes a conductive material. For example, the material of the first isolator 120 includes copper, aluminum, stainless steel, brass, gold foil, silver-plated copper, etc. The first dipole antenna 101, the second dipole antenna 102, and the first antenna 103 are all not in contact with the first isolator 120.

[0090] For example, the total length of the first isolator 120 is 0.15 times λ1 to 0.35 times λ1, where λ1 is the dielectric waveguide wavelength corresponding to the center frequency of the first antenna 103. For instance, the total length of the first isolator 120 can be 0.15 times λ1, 0.18 times λ1, 0.19 times λ1, 0.2 times λ1, 0.21 times λ1, 0.22 times λ1, 0.25 times λ1, 0.28 times λ1, 0.3 times λ1, 0.31 times λ1, 0.32 times λ1, or 0.35 times λ1, etc. In this way, the first isolator 120 can effectively reduce the crosstalk between the first antenna 103 and the second dipole antenna 102. The first isolator 120 can be considered as a quarter-wavelength resonator of λ1.

[0091] The embodiments of this application do not limit the extension path of the first isolation member 120. 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 first isolation member 120" refers to the total length of the extension path of the first isolation member 120.

[0092] Figure 5 is a schematic diagram of the structure of the first isolation member 120 and the second isolation member 130 provided in the embodiments of this application. Referring to Figure 5, the first isolation member 120 includes a first straight arm 121 and a second straight arm 122 connected together. The first straight arm 121 and the second straight arm 122 are perpendicular to each other, and the first straight arm 121 is parallel to the gap 200 (as shown in Figure 3). Thus, the first isolation member 120 has excellent isolation. The total length of the aforementioned first isolation member 120 refers to the sum of the lengths of the first straight arm 121 and the second straight arm 122. The embodiments of this application do not limit the ratio of the lengths of the first straight arm 121 and the second straight arm 122.

[0093] It is understood that the aforementioned perpendicularity between the first straight arm 121 and the second straight arm 122 allows for the existence of manufacturing and assembly errors. For example, the angle between the extension direction of the first straight arm 121 and the extension direction of the second straight arm 122 can be 88° (degrees) to 92°, and the angle between the extension direction of the first straight arm 121 and the extension direction of the second straight arm 122 can be, for example, 88°, 89°, 90°, 91° or 92°, etc.

[0094] Please refer back to Figure 3. In some embodiments of this application, the tri-band antenna assembly 100 may further include a second isolator 130, which is disposed on the substrate 110 and does not contact the first isolator 120. The vertical projection of the second isolator 130 on the substrate 110 is located between the slot 200 and the connection end 230.

[0095] Thus, the second isolator 130 and the first isolator 120 can together improve the isolation between the second dipole antenna 102 and the first antenna 103, and the second isolator 130 and the first isolator 120 have the function of decoupling.

[0096] The phrase "the vertical projection of the second isolator 130 on the substrate 110 is located between the gap 200 and the connection end 230" is similar to the description of "the vertical projection of the first isolator 120 on the substrate 110 is located between the gap 200 and the connection end 230" mentioned above, and will not be repeated here.

[0097] In embodiments of this application, the second spacer 130 and the first spacer 120 may be located on the same surface of the substrate 110 (e.g., the second surface 112). Alternatively, the second spacer 130 and the first spacer 120 may be located on different surfaces of the substrate 110. Obviously, when the second spacer 130 and the first spacer 120 are located on different surfaces of the substrate 110, they do not contact each other, and the vertical projections of the second spacer 130 and the first spacer 120 on the substrate 110 may overlap.

[0098] The total length of the second isolator 130 is 0.15 times λ2 to 0.35 times λ2, where λ2 is the dielectric waveguide wavelength corresponding to the center frequency of the second dipole antenna 102.

[0099] For example, the total length of the second isolator 130 can be 0.15 times λ², 0.18 times λ², 0.19 times λ², 0.2 times λ², 0.21 times λ², 0.22 times λ², 0.25 times λ², 0.28 times λ², 0.3 times λ², 0.31 times λ², 0.32 times λ², or 0.35 times λ². In this way, the second isolator 130 can effectively reduce the crosstalk between the first antenna 103 and the second dipole antenna 102. The second isolator 130 can be considered as a quarter-wavelength resonator of λ².

[0100] Similar to the first isolation member 120 mentioned above, the extension path of the second isolation member 130 is not limited in this embodiment. 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 second isolation member 130" refers to the second isolation member 130 being the total length of the extension path of the first isolation member 120.

[0101] For example, the vertical projection of the second spacer 130 onto the first surface 111 may also be located in region A of FIG4 above.

[0102] Please refer back to Figure 5. The second isolator 130 is a U-shaped component. The opening direction of the U-shaped component is perpendicular to the slot 200 (as shown in Figure 3), and the opening direction of the U-shaped component is opposite to the slot 200. Thus, the second isolator 130 can further improve the isolation between the second dipole antenna 102 and the first antenna 103. The total length of the second isolator 130 is the total length of the U-shaped component.

[0103] In Figure 5, the opening of the U-shaped component faces the first straight arm 121, and the second straight arm 122 and the U-shaped component are both located on the same side of the first straight arm 121. The first straight arm 121 and the U-shaped component are both located on the same side of the second straight arm 122.

[0104] Furthermore, the U-shaped component is located within the square area enclosed by the first straight arm 121 and the second straight arm 122.

[0105] In some embodiments of this application, the second isolator 130 is not necessary and may be omitted. In some embodiments, the first isolator 120 may also be a U-shaped element. The structure of this U-shaped element is described in the preceding description of the structure of the U-shaped element in the second isolator 130. In other words, in embodiments where the tri-band antenna assembly 100 has only one isolator, this isolator may be the structure of the first isolator 120 in FIG. 5, or it may be the U-shaped element shown in the second isolator 130.

[0106] In the embodiments of this application, the number of first dipole antennas 101 can be one or two. Similarly, the number of second dipole antennas 102 can be one or two.

[0107] In Figure 3, there are two of each of the first dipole antenna 101 and the second dipole antenna 102. A gap 200 exists between one first dipole antenna 101 and one second dipole antenna 102, with the gap closest to the connection end 230 being the first gap 030. The vertical projection of the aforementioned first isolator 120 onto the substrate 110 lies between the gap 200 and the connection end 230.

[0108] For example, a first dipole antenna 101 has a first stub 201 and a second stub 202, and a second dipole antenna 102 has a third stub 203 and a fourth stub 204. The two first stubs 201 and the two fourth stubs 204 are connected in a one-to-one correspondence. The two second stubs 202 and the two third stubs 203 are connected in a one-to-one correspondence.

[0109] In the example of Figure 3, the opening directions of the two first dipole antennas 101 are opposite, which makes the signal distribution of the two first dipole antennas 101 more uniform. The signal of the first dipole antenna 101 can be received well in multiple directions. The opening direction of the first dipole antenna 101 mentioned above refers to the direction in which the slit of the first dipole antenna 101 extends towards the two branches of the dipole (first branch 201 and second branch 202).

[0110] Similarly, in some embodiments, the openings of the two second dipole antennas 102 are oriented in opposite directions.

[0111] As described above, the first feed line 210 is used to feed the first dipole antenna 101 and the second dipole antenna 102. In embodiments where there are two first dipole antennas 101 and two second dipole antennas 102, the first feed line 210 feeds both first dipole antennas 101 and both second dipole antennas 102.

[0112] In Figure 3, the tri-band antenna assembly 100 also includes a first L-shaped microstrip line 301, a second L-shaped microstrip line 302, a first straight microstrip line 303, and a second straight microstrip line 304.

[0113] The aforementioned "microstrip line" is a type of microwave transmission line. This microstrip line is a conductor structure that can be manufactured using thin-film technology.

[0114] For example, the first L-shaped microstrip line 301 and the first straight microstrip line 303 are connected. For instance, the first L-shaped microstrip line 301 and the first straight microstrip line 303 are connected via conductive vias. The conductive vias penetrate the substrate.

[0115] Similarly, the second L-shaped microstrip line 302 and the second straight microstrip line 304 are connected. Exemplarily, the second L-shaped microstrip line 302 and the second straight microstrip line 304 are connected via conductive vias.

[0116] This application does not limit the formation process of the first L-shaped microstrip line 301, the second L-shaped microstrip line 302, the first straight microstrip line 303, and the second straight microstrip line 304. For example, the first L-shaped microstrip line 301, the second L-shaped microstrip line 302, the first straight microstrip line 303, and the second straight microstrip line 304 can be formed by printing.

[0117] This application embodiment does not limit the materials of the first L-shaped microstrip line 301, the second L-shaped microstrip line 302, the first straight microstrip line 303, and the second straight microstrip line 304. For example, the materials of the first L-shaped microstrip line 301, the second L-shaped microstrip line 302, the first straight microstrip line 303, and the second straight microstrip line 304 can be nickel, copper, aluminum, copper alloys, or aluminum alloys, etc.

[0118] The first feed line 210 is connected to a first L-shaped microstrip line 301 and a first stub 201 of a first dipole antenna 101 (as shown in Figure 3). The first L-shaped microstrip line 301 is connected to a first straight microstrip line 303 and a first stub 201 of another first dipole antenna 101. Since the first stub 201 and the fourth stub 204 are connected, it is clear that there is also a circuit connection between the first L-shaped microstrip line 301 and the fourth stub 204.

[0119] The first feed line 210 is also connected to a second stub 202 of a first dipole antenna 101 via a second L-shaped microstrip line 302 (as shown in Figure 3). The second L-shaped microstrip line 302 is connected to a second stub 202 of another first dipole antenna 101 via a second straight microstrip line 304. Similarly, since the second stub 202 is connected to the third stub 203, the second L-shaped microstrip line 302 and the fourth stub 204 are also electrically connected. In this way, the first feed line 210 feeds the two first dipole antennas 101 and the two second dipole antennas 102.

[0120] In other words, after the signal from the first feed line 210 is transmitted to the first L-shaped microstrip line 301, it is divided into two parts. One part is transmitted to the first stub 201 of a first dipole antenna 101, and the other part is transmitted through the first straight microstrip line 303 to the second stub 202 of another first dipole antenna 101. Similarly, after the signal from the first feed line 210 is transmitted to the second L-shaped microstrip line 302, it is divided into two parts. One part is transmitted to the second stub 202 of a first dipole antenna 101, and the other part is transmitted through the second straight microstrip line 304 to the first stub 201 of another first dipole antenna 101.

[0121] Thus, the second L-shaped microstrip line 302, the second straight microstrip line 304, the first L-shaped microstrip line 301, and the first straight microstrip line 303 can be regarded as power dividers, distributing the signal of the first feed line 210 to the two first dipole antennas 101 with relatively low signal loss.

[0122] Figure 6 is a schematic diagram of the structure of the first feeder line 210 provided in an embodiment of this application. Referring to Figure 6, the first feeder line 210 includes an outer conductor 211 and an inner conductor 212. The outer conductor 211 is disposed outside the inner conductor 212, and an insulating layer is disposed between the outer conductor 211 and the inner conductor 212. The inner conductor 212 is electrically connected to the first L-shaped microstrip line 301 (as shown in Figure 3), and the outer conductor 211 is electrically connected to the second L-shaped microstrip line 302 (as shown in Figure 3). Exemplarily, the inner conductor 212 and the first L-shaped microstrip line 301 can be connected by a solder layer, conductive adhesive, etc. The outer conductor 211 and the second L-shaped microstrip line 302 can be connected by a solder layer, conductive adhesive, etc. In some embodiments, the first feeder line 210 can be considered as a coaxial cable.

[0123] In the embodiment of Figure 3, the first antenna 103 is a monopole antenna. Exemplarily, the first antenna 103 includes a feed section 401, a first monopole arm 402, an inverter 403, and a second monopole arm 404. The structure of the second feed line 220 is described in the preceding figure 6 for the first feed line 210.

[0124] One end of the first monopole arm 402 is connected to the inner conductor of the second feed line 220, and the other end of the first monopole arm 402 is connected to the phase inverter 403. The end of the phase inverter 403 away from the first monopole arm 402 is connected to the second monopole arm 404. The outer conductor of the second feed line 220 is connected to the feed section 401. The feed section 401 has a U-shaped structure, with the opening of the U-shape facing the first isolator 120.

[0125] In the example of Figure 3, the power supply unit 401, the first monopole arm 402, the phase inverter 403, and the second monopole arm 404 are all disposed on the second surface 112.

[0126] Figure 7 is an enlarged schematic diagram of point F1 in Figure 3. Referring to Figure 7, the first feed line 210 at positions G1 and G2 in Figure 7 is not in direct electrical contact with the first dipole antenna. Position G3 is the location where the outer conductor of the first feed line 210 connects to the second L-shaped microstrip line 302. Position G4 is the location where the inner conductor of the first feed line 210 connects to the first L-shaped microstrip line 301.

[0127] Figure 8 is an enlarged schematic diagram of point F2 in Figure 3. Referring to Figure 8, the second feed line 220 at position G5 is not in direct electrical contact with the first antenna. Position G6 is the connection point between the outer conductor of the second feed line 220 and the feed section 401. Position G7 is the connection point between the inner conductor of the second feed line 220 and the first monopole arm 402.

[0128] The aforementioned connection end 230 (as shown in Figure 3) is the position closer to the gap 200 (as shown in Figure 3) between positions G7 and G6. Connection end 230 is the end of the outer conductor of the second feed line 220 in Figure 3 that is close to the first antenna 103, that is, the second feed line 220 at position G6 in Figure 8.

[0129] In some embodiments of this application, the first antenna 103 may be a dipole antenna.

[0130] Figure 9 is another distribution diagram of the various components on the first surface 111 and the second surface 112 provided in the embodiment of this application. The difference between Figure 9 and Figure 3 includes that the structure of the first antenna 103 is different. For the remaining structures, please refer to the description in the example shown in Figure 3 above, and will not be repeated here.

[0131] In the embodiment shown in Figure 9, the first antenna 103 includes two dipole antennas connected in series. The first antenna 103 includes a first dipole arm 405, a second dipole arm 406, a third dipole arm 407, and a fourth dipole arm 408. The first dipole arm 405 and the second dipole arm 406 can be considered as the first element of the dipole antenna. The third dipole arm 407 and the fourth dipole arm 408 can be considered as the second element of the dipole antenna.

[0132] The first vibrating arm 405 and the third vibrating arm 407 are disposed on the first surface 111. The second vibrating arm 406 and the fourth vibrating arm 408 are disposed on the second surface 112. The first antenna 103 also includes a first microstrip line 409 and a second microstrip line 410. One end of the fourth vibrating arm 408 is connected to the first microstrip line 409, and the second vibrating arm 406 is not in contact with the first microstrip line 409. The first vibrating arm 405 and the third vibrating arm 407 are connected through the second microstrip line 410; the extension directions of the first microstrip line 409 and the second microstrip line 410 are parallel, and the vertical projections of the first microstrip line 409 and the second microstrip line 410 on the first surface 111 overlap. The aforementioned first microstrip line 409 and the second microstrip line 410 can be regarded as parallel double lines.

[0133] The outer conductor of the second feed line 220 is connected to the second vibrator arm 406. The inner conductor of the second feed line 220 is connected to the first microstrip line 409.

[0134] It is understood that in other embodiments, the first antenna 103 may be other antenna structures, and this application does not limit this.

[0135] The tri-band antenna assembly 100 with three operating frequency bands provided in this application has advantages such as high integration, high isolation, and low adjacent channel interference. It can effectively improve the system throughput performance and stability of network devices.

[0136] The performance of the three-band antenna assembly 100 shown in Figure 3 will be described below with reference to Figures 10-14.

[0137] Figure 10 shows the S-parameters of the three-band antenna assembly in the 2.3GHz-2.6GHz frequency band. In Figure 10, port 1 is the port connected to the first feed line. Port 2 is the port connected to the second feed line. As can be seen from Figure 10, when S... 11 When the parameter is less than -10dB, it indicates that port 1 is impedance matched; therefore, the operating frequency of the first dipole antenna is 2.38GHz-2.51GHz. 22 A parameter greater than -10dB indicates an impedance mismatch at port 2, therefore the first antenna is inoperable in the 2.3GHz-2.6GHz frequency band. 21 A parameter less than -14dB indicates that the isolation between port 1 and port 2 is greater than 14dB within the 2.4GHz-2.5GHz frequency band.

[0138] Figure 11 shows the S-parameters of the three-band antenna assembly in the 5.0 GHz-6.0 GHz frequency band. Port 1 of the S-parameters is the port connected to the first feed line. Port 2 is the port connected to the second feed line. As mentioned above, the first dipole antenna and the second dipole antenna share the first feed line.

[0139] In Figure 11, S 11 This refers to the operating bandwidth curve of the second dipole antenna, within the 5.15GHz-5.4GHz frequency band, S 11 The parameter being less than -10dB indicates that the second dipole antenna operates in the frequency band of 5.15GHz-5.4GHz. 22 This refers to the operating bandwidth curve of the first antenna, within the 5.7GHz-5.85GHz frequency band, S 22 A parameter less than -10dB indicates that the first antenna operates in the 5.7GHz-5.85GHz frequency band. 21 This refers to the isolation curve between the second dipole antenna and the first antenna. Within the 5.0GHz-6.0GHz frequency band, S... 21 The parameter is less than -30dB. Therefore, the isolation between port 1 and port 2 is greater than 30dB in the 5.0GHz-6.0GHz frequency band.

[0140] Figure 12 shows the antenna radiation pattern of the three-band antenna assembly in the 2.4 GHz band. The dashed line represents the magnetic plane (H-plane), and the solid line represents the electric plane (E-plane). In Figure 12, the radial coordinates represent the antenna gain, in dBi; the radial coordinate scales are -25.0 dBi, -20.0 dBi, -15.0 dBi, -10.0 dBi, -5.0 dBi, and 0.0 dBi, as shown in Figure 12. The circumferential coordinates represent the antenna azimuth, in degrees (°). The circumferential coordinate scales are 0°, 30°, 60°, 90°, 120°, 150°, -180°, -150°, -120°, -90°, -60°, and -30°, as shown in Figure 12.

[0141] Figure 13 shows the antenna radiation pattern of the three-band antenna assembly in the 5.2 GHz band. Similarly, in Figure 13, the dashed line represents the magnetic plane (H-plane), and the solid line represents the electrical plane (E-plane). The radial coordinates represent the antenna gain, measured in dBi. The radial coordinate scales are -15 dBi, -10 dBi, -5 dBi, 0 dBi, and 5 dBi, as shown in Figure 13. The circumferential coordinates represent the antenna azimuth, measured in degrees (°). The circumferential coordinate scales are 0°, 30°, 60°, 90°, 120°, 150°, -180°, -150°, -120°, -90°, -60°, and -30°, as shown in Figure 13.

[0142] Figure 14 shows the antenna radiation pattern of the three-band antenna assembly in the 5.8 GHz band. Similarly, in Figure 14, the dashed line represents the magnetic plane (H-plane), and the solid line represents the electrical plane (E-plane). The radial coordinates represent the antenna gain, measured in dBi. The radial coordinate scales are -15 dBi, -10 dBi, -5 dBi, 0 dBi, and 5 dBi, as shown in Figure 14. The circumferential coordinates represent the antenna azimuth, measured in degrees (°). The circumferential coordinate scales are 0°, 30°, 60°, 90°, 120°, 150°, -180°, -150°, -120°, -90°, -60°, and -30°, as shown in Figure 14.

[0143] 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. A three-band antenna assembly, characterized in that, The tri-band antenna assembly includes: substrate; A first dipole antenna is disposed on the substrate. The first dipole antenna includes a first stub and a second stub, and there is a gap between the first stub and the second stub. A second dipole antenna is disposed on the substrate. The second dipole antenna includes a third stub and a fourth stub, and the slot extends between the third stub and the fourth stub. The first feed line is used to feed the first dipole antenna and the second dipole antenna; A first antenna is disposed on the substrate; A second feed line is used to feed the first antenna, and the end of the second feed line that connects to the first antenna is a connection end; and A first isolation member is disposed on the substrate, and the vertical projection of the first isolation member on the substrate is located between the gap and the connection end; The difference between the center frequency of the first antenna and the center frequency of the second dipole antenna and the center frequency of the first dipole antenna is greater than the difference between the center frequency of the first antenna and the center frequency of the second dipole antenna.

2. The three-band antenna assembly according to claim 1, characterized in that, The vertical projection of any one of the first branch, the second branch, the third branch, and the fourth branch onto the substrate does not overlap with the vertical projection of the first spacer onto the substrate.

3. The three-band antenna assembly according to claim 1, characterized in that, The total length of the first isolator is 0.15 times λ1 to 0.35 times λ1, where λ1 is the dielectric waveguide wavelength corresponding to the center frequency of the first antenna.

4. The three-band antenna assembly according to any one of claims 1-3, characterized in that, The tri-band antenna assembly further includes a second isolator disposed on the substrate. The second isolator does not contact the first isolator, and the vertical projection of the second isolator on the substrate is located between the gap and the connection end.

5. The three-band antenna assembly according to claim 4, characterized in that, The total length of the second isolator is 0.15 times λ2 to 0.35 times λ2, where λ2 is the dielectric waveguide wavelength corresponding to the center frequency of the second dipole antenna.

6. The three-band antenna assembly according to claim 4, characterized in that, The second separator is a U-shaped member, the opening direction of which is perpendicular to the gap, and the opening direction of which is opposite to the gap.

7. The three-band antenna assembly according to claim 6, characterized in that, The first isolation element includes a first straight arm and a second straight arm connected together, the first straight arm and the second straight arm being perpendicular to each other; the first straight arm is parallel to the gap.

8. The three-band antenna assembly according to claim 7, characterized in that, The U-shaped component and the second straight arm are both located on the same side of the first straight arm.

9. The three-band antenna assembly according to claim 7, characterized in that, The U-shaped component and the first straight arm are both located on the same side of the second straight arm.

10. The three-band antenna assembly according to any one of claims 1-3, characterized in that, The number of first dipole antennas is two, and the number of second dipole antennas is two; there is a gap between each of the first dipole antennas and each of the second dipole antennas, and the gap closest to the connection end is the first gap; The vertical projection of the first spacer on the substrate is located between the first gap and the connecting end.

11. The three-band antenna assembly according to any one of claims 1-3, characterized in that, The first feed line and the second feed line are respectively disposed on opposite sides of the substrate.

12. The three-band antenna assembly according to any one of claims 1-3, characterized in that, The first antenna is a dipole antenna; or, the first antenna is a monopole antenna.

13. A fiber-to-the-room access device, characterized in that, The fiber-to-the-room access device includes a housing and a three-band antenna assembly as described in any one of claims 1-12, wherein the housing is configured to form a mounting cavity, and the three-band antenna assembly is disposed within the mounting cavity.

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