Dual-band indoor distributed antenna for 5g / 6g

Abstract

The application provides a dual-frequency indoor-outdoor antenna for 5G / 6G, and relates to the technical field of communication.The dual-frequency indoor-outdoor antenna comprises a first dielectric substrate, a ground plate and a second dielectric substrate which are arranged in a stacking mode along the thickness direction.The upper surface of the first dielectric substrate is provided with an input feed line, a first output feed line group and a second output feed line group.The input feed line comprises a transmission section which couples signals to the first output feed line group and the second output feed line group, the first output feed line group is configured to transmit signals of a first frequency band, and the second output feed line group is configured to transmit signals of a second frequency band.The upper surface of the second dielectric substrate is provided with an antenna radiation group which is used for radiating signals from the first output feed line group and the second output feed line group.The dual-frequency indoor-outdoor antenna provided by the application can achieve the performance of high gain and high isolation while maintaining a low profile structure.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a dual-band indoor antenna for 5G / 6G. Background Technology

[0002] Dual-band indoor distributed antennas are wireless communication antennas used in indoor distributed scenarios. They can transmit and receive signals and provide coverage in two specific frequency bands. They are widely used in modern communication systems such as smart buildings, rail transit stations, and large stadiums to meet the needs of multi-network coexistence and deep coverage.

[0003] In the existing technology, the technical solutions for realizing dual-band indoor distributed antennas mainly include three categories: First, adopting a structure of two independent single-band antennas combined with a passive decoupling network, reducing signal interference by adding physical spacing and decoupling network; Second, using a single dual-band antenna in conjunction with a broadband feed network, using the broadband feed network to excite the dual-band antenna to process multi-band signals; Third, integrating the dual-band antenna with a duplex filter network, using the frequency selectivity of the duplex filter network to achieve signal separation.

[0004] However, existing dual-band indoor antenna solutions struggle to achieve both high isolation and good impedance matching while meeting the requirements of low profile and miniaturization. Summary of the Invention

[0005] In view of the above problems, this application provides a dual-band indoor antenna for 5G / 6G, which can achieve high gain and high isolation performance while maintaining a low profile structure.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] This application provides a dual-band indoor distributed antenna for 5G / 6G, comprising: a first dielectric substrate, wherein an input feed line, a first output feed line group, and a second output feed line group are disposed on the upper surface of the first dielectric substrate; the input feed line includes a transmission section, the first output feed line group and the second output feed line group are respectively located on both sides of the transmission section along a first direction, the first direction being perpendicular to the extension direction of the input feed line and perpendicular to the thickness direction of the first dielectric substrate; the transmission section couples signals to the first output feed line group and the second output feed line group; the first output feed line group is configured to transmit a first frequency band signal, and the second output feed line group is configured to transmit a second frequency band signal; a second dielectric substrate, wherein an antenna radiating group is disposed on the upper surface of the second dielectric substrate, the antenna radiating group being used to radiate the first frequency band signal and the second frequency band signal; and a ground plane, wherein the first dielectric substrate, the ground plane, and the second dielectric substrate are stacked along the thickness direction of the first dielectric substrate.

[0008] In one possible implementation, a first output feed group is configured to form a first metallized via, which is electrically connected to the first output feed group; a second output feed group is configured to form a second metallized via, which is electrically connected to the second output feed group; an antenna radiating group is configured to form a third and a fourth metallized via, which are electrically connected to the antenna radiating group respectively; a ground plane is configured to form a first via and a second via, which are electrically isolated from the ground plane; wherein the first metallized via, the third metallized via, and the first via are aligned along the thickness direction of the first dielectric substrate; the first metallized via is electrically connected to the third metallized via to transmit a signal of a first frequency band from the first output feed group to the antenna radiating group; the second metallized via, the fourth metallized via, and the second via are aligned along the thickness direction of the first dielectric substrate; the second metallized via is electrically connected to the fourth metallized via to transmit a signal of a second frequency band from the second output feed group to the antenna radiating group.

[0009] In one possible implementation, the first output feed group includes a first resonator and a first output feed line; the first resonator is disposed on one side of the transmission section along a first direction, and the first output feed line is disposed on the side of the first resonator away from the transmission section along the first direction; when the frequency of the input signal is within the passband of the first resonator, the first resonator couples the signal energy from the transmission section to the first output feed group, and the first output feed group transmits the signal energy to the antenna radiating group to radiate a first frequency band signal; the second output feed group includes a second resonator and a second output feed line; the second resonator is disposed on the side of the transmission section away from the first resonator along the first direction, and the second output feed line is disposed on the side of the second resonator away from the transmission section along the first direction; when the frequency of the input signal is within the passband of the second resonator, the second resonator couples the signal energy from the transmission section to the second output feed group, and the second output feed group transmits the signal energy to the antenna radiating group to radiate a second frequency band signal; wherein, the size of the second resonator is smaller than the size of the first resonator.

[0010] In one possible implementation, the first resonator is a U-shaped resonator, which includes two first coupling sections and a first connecting section. The two first coupling sections are spaced apart along a first direction and are parallel to the transmission section. The two ends of the first connecting section are respectively connected to the ends of the two first coupling sections away from the signal input of the transmission section. The second resonator is a U-shaped resonator, which includes two second coupling sections and a second connecting section. The two second coupling sections are spaced apart along the first direction and are parallel to the transmission section. The two ends of the second connecting section are respectively connected to the ends of the two second coupling sections away from the signal input of the transmission section.

[0011] In one possible implementation, the first output feed line includes a first ground portion, a first coupling portion, and a first output portion connected in sequence. The first ground portion is configured to form a seventh via, which is electrically connected to the first ground portion and to a ground plane. The seventh via is configured to generate a transmission zero in the second frequency band to suppress the transmission of the second frequency band signal to the first output feed line. The first output portion is configured to form a first metallized via, which is electrically connected to the first output portion. The second output feed line includes a second ground portion, a second coupling portion, and a second output portion connected in sequence. The second ground portion is configured to form an eighth via, which is electrically connected to the second ground portion and to a ground plane. The eighth via is configured to generate a transmission zero in the first frequency band to suppress the transmission of the first frequency band signal to the second output feed line. The second output portion is configured to form a second metallized via, which is electrically connected to the second output portion.

[0012] In one possible implementation, the first coupling portion includes a first part and a second part, the first part being parallel to the extension direction of the transmission segment, the second part being located at the end of the first part away from the signal input of the transmission segment, and the second part extending along a first direction; a first grounding portion being located at the end of the first part away from the second part, and a first output portion being disposed at the end of the second part away from the transmission segment along the first direction; the second coupling portion includes a third part and a fourth part, the third part being parallel to the extension direction of the transmission segment, the fourth part being located at the end of the third part away from the signal input of the transmission segment, and the fourth part extending along the first direction; a second grounding portion being located at the end of the third part away from the fourth part, and a second output portion being disposed at the end of the fourth part away from the transmission segment along the first direction.

[0013] In one possible implementation, the antenna radiating group includes a first radiating element and a second radiating element; the first radiating element is configured to form a third metallized via; the first radiating element includes a first sector patch, and the third metallized via is located on the angle bisector of the first sector patch; the second radiating element is configured to form a fourth metallized via; the second radiating element includes a second sector patch, and the fourth metallized via is located on the angle bisector of the second sector patch; wherein the radius of the first sector patch is larger than the radius of the second sector patch.

[0014] In one possible implementation, the first sector patch is configured to form a plurality of fifth metallized vias, the plurality of fifth metallized vias being arranged along the arc direction of the first sector patch, and the interval between each two adjacent fifth metallized vias forming a first coupling window; the second sector patch is configured to form a plurality of sixth metallized vias, the plurality of sixth metallized vias being arranged along the arc direction of the second sector patch, and the interval between each two adjacent sixth metallized vias forming a second coupling window.

[0015] In one possible implementation, the diameters of the first metallized via, the second metallized via, the third metallized via, and the fourth metallized via are equal, and the diameters of the first via and the second via are respectively larger than the diameter of the first metallized via; the first metallized via and the third metallized via are electrically connected through a first conductor, the first conductor passing through the first via and being electrically isolated from the first via; the second metallized via and the fourth metallized via are electrically connected through a second conductor, the second conductor passing through the second via and being electrically isolated from the second via.

[0016] In one possible implementation, the input feed line further includes: a feed input section for receiving radio frequency signals from an external circuit; an impedance transformation section, which is a quarter-wavelength microstrip line, with one end connected to the output of the feed input section and the other end connected to the transmission section, for realizing impedance transformation from the feed input section to the transmission section; and a matching stub connected in parallel to the impedance transformation section; wherein the radio frequency signal enters the transmission section sequentially through the feed input section, the impedance transformation section, and the matching stub.

[0017] The dual-band indoor distributed antenna for 5G / 6G provided in this application includes a first dielectric substrate, a second dielectric substrate, and a ground plane. The upper surface of the first dielectric substrate is provided with an input feed line, a first output feed line group, and a second output feed line group. The input feed line includes a transmission section that couples signals to the first and second output feed line groups. The first output feed line group is configured to transmit a first frequency band signal, and the second output feed line group is configured to transmit a second frequency band signal. The first and second output feed line groups are located on opposite sides of the transmission section along a first direction, which is perpendicular to the extension direction of the input feed line and perpendicular to the thickness direction of the first dielectric substrate. This allows for effective separation of the first and second frequency band signals, achieving high isolation between the two frequency bands.

[0018] An antenna radiating group is disposed on the upper surface of the second dielectric substrate. The antenna radiating group is used to convert the radio frequency energy of the first output feed group and the second output feed group into electromagnetic signals of corresponding frequency bands for radiation. The first dielectric substrate, the ground plane and the second dielectric substrate are stacked along the thickness direction of the first dielectric substrate. While maintaining a compact structure, the signal transmission path can be shortened and the transmission loss can be reduced, which is beneficial to realizing the low profile and miniaturized design of the dual-band indoor distributed antenna. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a dual-band indoor distribution antenna provided in an embodiment of this application;

[0021] Figure 2 A top view of a dual-band indoor antenna provided in an embodiment of this application;

[0022] Figure 3 This application provides a schematic diagram of the dimensions of a dual-band indoor distributed antenna and a corresponding table of dimensions.

[0023] Figure 4 The S-parameter simulation curves of the dual-band indoor antenna feed network provided in the embodiments of this application are shown.

[0024] Figure 5 The S-parameter curve of the dual-band indoor distribution antenna provided in the embodiments of this application;

[0025] Figure 6 Gain characteristic curve of dual-band indoor antenna provided in the embodiments of this application;

[0026] Figure 7 The radiation patterns of the dual-band indoor distributed antenna provided in this application at two characteristic frequency points, 1.92 GHz and 2.44 GHz;

[0027] (a) is the radiation pattern of the E-plane at 1.92 GHz;

[0028] (b) is the H-plane radiation pattern at 1.92 GHz;

[0029] (c) shows the E-plane radiation pattern at 2.44 GHz;

[0030] (d) is the H-plane radiation pattern at 2.44 GHz.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10-Dual-band indoor distribution antenna;

[0033] 100 - First dielectric substrate; 200 - Second dielectric substrate; 300 - Ground plane;

[0034] 110 - Input feed line; 120 - First output feed line group; 130 - Second output feed line group; 210 - Antenna radiating group; 310 - First through hole; 320 - Second through hole;

[0035] 120a - First metallized through-hole; 120b - Seventh through-hole; 130a - Second metallized through-hole; 130b - Eighth through-hole;

[0036] 111-Transmission section; 112-Feed input section; 113-Impedance transformation section; 114-Matching stub; 121-First resonator; 122-First output feed line; 131-Second resonator; 132-Second output feed line; 211-First radiating element; 212-Second radiating element;

[0037] 1211 - First coupling section; 1212 - First connection section; 1221 - First grounding part; 1222 - First coupling part; 1223 - First output part; 1311 - Second coupling section; 1312 - Second connection section; 1321 - Second grounding part; 1322 - Second coupling part; 1323 - Second output part; 2111 - First sector patch; 2112 - Fifth metallized via; 2113 - Third metallized via; 2123 - Fourth metallized via; 2121 - Second sector patch; 2122 - Sixth metallized via;

[0038] A - Part One; B - Part Two; C - Part Three; D - Part Four;

[0039] X - First direction; Y - Thickness direction. Detailed Implementation

[0040] As described in the background section, dual-band distributed antennas (DDAs) are key components for achieving indoor signal coverage in modern wireless communication systems. Dual-band DDAs can operate simultaneously in two specific frequency bands to meet the coverage requirements of multiple communication systems coexisting in typical indoor scenarios such as smart buildings, rail transit stations, and large stadiums. With the development of indoor communication technology, dual-band DDAs need to simultaneously meet the comprehensive requirements of miniaturization, integration, low profile, and high isolation.

[0041] In existing technologies, the main solution for implementing dual-band indoor distributed antennas is to use two independent single-band antennas as signal radiating carriers. This is achieved by increasing the physical distance between the two antennas and introducing a decoupling network composed of passive components such as inductors, capacitors, or transmission lines to improve the isolation between the two bands. However, this type of solution suffers from complex structure and large overall size, making it difficult to adapt to limited indoor installation space. Furthermore, the additional design of the decoupling network significantly increases manufacturing costs.

[0042] Another common approach uses a single dual-band antenna with dual-band radiation capability as its core. This antenna is driven by a broadband feed network composed of components such as branch line couplers or power dividers to achieve multi-band signal coverage. While this approach has a relatively simple overall structure, the broadband feed network cannot perform independent performance optimization for each frequency band. This results in insufficient inter-band isolation for the dual-band indoor antenna, and limitations on the radiation efficiency and matching performance of each band, making it difficult to meet the signal integrity requirements of indoor communication.

[0043] Another approach utilizes the frequency selectivity of the bandpass filter in a duplex filtering network to effectively separate dual-band signals and reduce inter-band interference. However, this approach has several drawbacks: the duplexer requires a highly selective filtering structure, leading to high design complexity; impedance matching between the duplexer and the dual-band antenna is difficult, easily resulting in signal insertion loss and reducing the overall signal transmission efficiency of the antenna; furthermore, the complex manufacturing process makes it impossible to achieve a low-profile integrated design for dual-band indoor distributed antennas, which is difficult to meet the spatial aesthetic requirements for equipment installation indoors.

[0044] Therefore, existing dual-band indoor antennas cannot simultaneously meet the comprehensive requirements of high isolation, high performance, low cost, and low profile within a limited space.

[0045] In view of this, embodiments of this application provide a dual-band indoor antenna for 5G / 6G.

[0046] The dual-band indoor distributed antenna for 5G / 6G of this application integrates a feeding unit consisting of an input feed line, a first output feed line group, and a second output feed line group on the upper surface of a first dielectric substrate, and integrates an antenna radiating group for signal radiation on the upper surface of a second dielectric substrate. A ground plane is used in between to achieve electromagnetic shielding and provide a reference potential between the two. The first dielectric substrate, the ground plane, and the second dielectric substrate are stacked along the thickness direction of the first dielectric substrate, so that the signal transmission path from the feeding unit to the radiating unit does not need to extend a long distance in the plane, which can shorten the signal transmission path, reduce transmission loss, and facilitate the low profile and miniaturization design of the dual-band indoor distributed antenna.

[0047] In addition, to address the issue that existing solutions require additional components to ensure isolation, resulting in complex structures, those skilled in the art can physically partition the first output feeder group and the second output feeder group responsible for transmitting signals in different frequency bands. The first output feeder group used for transmitting signals in the first frequency band and the second output feeder group used for transmitting signals in the second frequency band are respectively set on both sides of the transmission segment along the first direction, thereby achieving effective separation of the first frequency band signal and the second frequency band signal and achieving high isolation between the first frequency band and the second frequency band.

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] Figure 1 This is a schematic diagram of the structure of a dual-band indoor antenna provided in an embodiment of this application. Figure 2 This is a top view of a dual-band indoor antenna provided in an embodiment of this application.

[0050] Reference Figure 1 and Figure 2 This application provides a dual-band indoor distributed antenna (hereinafter referred to as dual-band indoor antenna) 10 for 5G / 6G. The dual-band indoor antenna 10 provided by this application can be applied to modern wireless communication indoor distribution scenarios with strict requirements for spatial layout and signal quality. For example, the dual-band indoor antenna 10 can be applied to scenarios such as 5G / 6G indoor coverage, smart buildings, and rail transit stations, meeting the deep coverage requirements of office buildings and commercial complexes for the coexistence of multiple generations of communication systems, and facilitating conformal installation with the building environment.

[0051] The above is merely an illustrative description of the application scenarios of the dual-band indoor distributed antenna 10 in the embodiments of this application, and is not intended to limit the application scenarios of the dual-band indoor distributed antenna 10 in the embodiments of this application.

[0052] Reference Figure 1 and Figure 2 The dual-band indoor distributed antenna 10 provided in this application includes a first dielectric substrate 100, a second dielectric substrate 200, and a ground plane 300, wherein the first dielectric substrate 100 and the second dielectric substrate 200 are made of insulating dielectric material, and the ground plane 300 is made of metallic conductive material.

[0053] In some embodiments, the first dielectric substrate 100 and the second dielectric substrate 200 may use the same dielectric material to simplify the manufacturing process and ensure structural consistency.

[0054] In other embodiments, the first dielectric substrate 100 and the second dielectric substrate 200 may also employ dielectric materials with different dielectric constants or loss characteristics. For example, the first dielectric substrate 100 may be selected from low-loss high-frequency circuit board materials to optimize signal transmission efficiency. The second dielectric substrate 200 may be selected from the more cost-effective standard FR-4 material to achieve a balance between performance and cost.

[0055] The first dielectric substrate 100, the ground plane 300, and the second dielectric substrate 200 are stacked along the thickness direction Y of the first dielectric substrate 100. For example, the first dielectric substrate 100, the ground plane 300, and the second dielectric substrate 200 can be integrally bonded by hot pressing or bonding processes, ensuring structural stability and low profile characteristics while providing reliable mechanical support and electromagnetic shielding for the dual-band indoor antenna 10.

[0056] Reference Figure 2 An input feed line 110, a first output feed line group 120, and a second output feed line group 130 are disposed on the upper surface of the first dielectric substrate 100. The input feed line 110 includes a transmission section 111, which is connected to a signal input terminal and can transfer the input signal energy to the first output feed line group 120 and the second output feed line group 130 through electromagnetic coupling.

[0057] The first output feeder group 120 can transmit a first frequency band signal, and the second output feeder group 130 can transmit a second frequency band signal, thereby realizing the separation and directional transmission of dual-frequency signals. In this embodiment, the first frequency band signal corresponds to a low-frequency band signal, and the second frequency band signal corresponds to a high-frequency band signal.

[0058] The first output feed group 120 and the second output feed group 130 are located on both sides of the transmission section 111 along the first direction X. In this embodiment, the first direction X is perpendicular to the extension direction of the input feed line 110 and perpendicular to the thickness direction Y of the first dielectric substrate 100. In this way, the first frequency band signal and the second frequency band signal can be effectively separated, achieving a high degree of isolation between the first frequency band and the second frequency band.

[0059] In some possible embodiments, the input feed line 110 may further include a feed input section 112 and an impedance transformation section 113 connected in sequence, and integrate a matching stub 114. The feed input section 112 serves as a radio frequency interface for receiving radio frequency signals from external circuits. The impedance transformation section 113 employs a quarter-wavelength microstrip line structure, with one end connected to the output of the feed input section 112 and the other end connected to the transmission section 111. Impedance matching between the feed input section 112 and the transmission section 111 is achieved through periodic changes in characteristic impedance.

[0060] Matching stub 114 is connected in parallel to impedance transformation section 113. By introducing a controllable reactance component, the impedance matching characteristics between the first and second frequency bands can be optimized. After the signal is input from the port circuit, it enters the transmission section 111 through the feed input section 112, impedance transformation section 113, and matching stub 114. Then, the energy is simultaneously transferred to the first resonator 121 and the second resonator 131 via electromagnetic coupling.

[0061] Based on the frequency selectivity of the first resonator 121 and the second resonator 131, the signal can be further transmitted to the corresponding first output feed line 122 or second output feed line 132 through the electromagnetic coupling mechanism only when the signal frequency is in the neighborhood of the resonant frequency of the first resonator 121 or the second resonator 131.

[0062] In this way, through the coordinated operation of the power input section 112, impedance transformation section 113, matching stub 114 and transmission section 111, low-loss transmission of radio frequency signals, wideband impedance matching and dual-channel energy distribution can be achieved, ensuring the stable operation of the dual-band indoor antenna 10.

[0063] Reference Figure 1 An antenna radiating group 210 is provided on the upper surface of the second dielectric substrate 200. The antenna radiating group 210 can receive and radiate electromagnetic energy from the first output feed group 120 and the second output feed group 130 to form a radiation field pattern covering two operating frequency bands.

[0064] The dual-band indoor distributed antenna 10 provided in this application integrates the input feed line 110, the first output feed line group 120 and the second output feed line group 130 on the first dielectric substrate 100, integrates the antenna radiating group 210 on the second dielectric substrate 200, and stacks the first dielectric substrate 100, the ground plane 300 and the second dielectric substrate 200. This avoids the complex connection and matching links between independent duplex devices and discrete antenna units in traditional solutions, reduces the overall cross-sectional height of the dual-band indoor distributed antenna 10, achieves miniaturization of the dual-band indoor distributed antenna 10 structure, and reduces manufacturing costs.

[0065] In some embodiments, the first output feed group 120 may be configured to form a first metallized via 120a, which is electrically connected to the first output feed group 120.

[0066] The second output feed group 130 can be configured to form a second metallized via 130a, which is electrically connected to the second output feed group 130.

[0067] The antenna radiating group 210 can be constructed to form a third metallized through-hole 2113 and a fourth metallized through-hole 2123, which are electrically connected to the antenna radiating group 210 respectively.

[0068] The grounding plate 300 is constructed to form a first through hole 310 and a second through hole 320, which are electrically isolated from the grounding plate 300 respectively.

[0069] The first metallized via 120a, the third metallized via 2113, and the first via 310 are aligned along the thickness direction Y of the first dielectric substrate 100. The first metallized via 120a and the third metallized via 2113 are electrically connected so that the low-frequency signal of the first output feed line group 120 is transmitted to the antenna radiation group 210.

[0070] The second metallized via 130a, the fourth metallized via 2123, and the second via 320 are aligned along the thickness direction Y of the first dielectric substrate 100. The second metallized via 130a and the fourth metallized via 2123 are electrically connected so that the high-frequency signal of the second output feed line group 130 is transmitted to the antenna radiating group 210.

[0071] In some possible embodiments, the first metallized via 120a and the third metallized via 2113 can be electrically connected by a first conductor (not shown in the figure). The first conductor passes through the first via 310 and is electrically isolated from the first via 310. The first conductor can form a conductive path between the first output feed line group 120 and the antenna radiation group 210 to realize electrical signal transmission and electrical interconnection.

[0072] The second metallized via 130a and the fourth metallized via 2123 can be electrically connected by a second conductor (not shown in the figure). The second conductor passes through the second via 320 and is electrically isolated from the second via 320. The second conductor can form a conductive path between the second output feed line group 130 and the antenna radiation group 210 to realize electrical signal transmission and electrical interconnection.

[0073] It should be noted that the diameters of the first metallized through hole 120a, the second metallized through hole 130a, the third metallized through hole 2113, and the fourth metallized through hole 2123 are equal, and the diameters of the first through hole 310 and the second through hole 320 are larger than the diameter of the first metallized through hole 120a.

[0074] In this way, the diameters of the first through hole 310 and the second through hole 320 are larger than the diameter of the first metallized through hole 120a, which can provide sufficient space and insulation gaps for the first conductor and the second conductor passing through them on the ground plane 300, respectively. This avoids accidental electrical contact or unnecessary high-frequency parasitic coupling between the first conductor and the second conductor and the ground plane 300, ensures the isolation between high-frequency signals and low-frequency signals during transmission, and is conducive to achieving good impedance matching.

[0075] In some possible embodiments, the first conductor can be implemented by integrally depositing a metallization layer on the inner walls of aligned first metallized vias 120a and third metallized vias 2113. The second conductor can be implemented by integrally depositing a metallization layer on the inner walls of aligned second metallized vias 130a and fourth metallized vias 2123.

[0076] Alternatively, the first conductor can be a separately mounted metal conductor, such as a copper pillar or probe. The outer surface of the first conductor can be welded or crimped to the inner walls of the first metallized through-hole 120a and the third metallized through-hole 2113 to achieve a reliable electrical connection.

[0077] The second conductor can also be a separately mounted metal conductor, such as a copper pillar or probe. The outer surface of the second conductor can be welded or crimped to the inner walls of the second metallized through-hole 130a and the fourth metallized through-hole 2123 to achieve a reliable electrical connection.

[0078] In this embodiment, as long as the first conductor and the second conductor can respectively achieve stable signal transmission and electrical interconnection between the first output feed line group 120 and the antenna radiation group 210, and between the second output feed line group 130 and the antenna radiation group 210, the specific structure of the first conductor and the second conductor is not limited in this embodiment.

[0079] Reference Figure 2 The first output feed line group 120 includes a first resonator 121 and a first output feed line 122. The first resonator 121 is disposed on one side of the transmission section 111 along the first direction X, and the first output feed line 122 is disposed on the side of the first resonator 121 along the first direction X away from the transmission section 111. The second output feed line group 130 includes a second resonator 131 and a second output feed line 132; the second resonator 131 is disposed on the side of the transmission section 111 along the first direction X away from the first resonator 121, and the second output feed line 132 is disposed on the side of the second resonator 131 along the first direction X away from the transmission section 111.

[0080] The second resonator 131 has a fundamental frequency resonance physical length that is smaller than the corresponding physical length of the first resonator 121. In the microwave frequency band, the physical length of a resonator is usually inversely proportional to its resonant frequency; a shorter resonator corresponds to a higher resonant frequency, and a longer resonator corresponds to a lower resonant frequency.

[0081] Therefore, in this embodiment, by controlling the size parameters of the first resonator 121 and the second resonator 131, the size of the first resonator 121 is matched with the electrical half-wavelength or quarter-wavelength of the first frequency band, and the size of the second resonator 131 is matched with the electrical half-wavelength or quarter-wavelength of the second frequency band. This allows the first resonator 121 to resonate with signals in the lower frequency band, while the second resonator 131 resonates with signals in the higher frequency band. Thus, frequency-selective coupling and separation of dual-frequency signals can be achieved, ensuring that signals in different frequency bands can be transmitted efficiently through their respective corresponding paths, while avoiding mutual interference between frequency bands.

[0082] In some possible embodiments, the first resonator 121 can be a U-shaped resonator, which may include two first coupling sections 1211 and a first connecting section 1212. The two first coupling sections 1211 are spaced apart along a first direction X and are parallel to the transmission section 111. The two ends of the first connecting section 1212 are respectively connected to the ends of the two first coupling sections 1211 that are away from the signal input of the transmission section 111.

[0083] The second resonator 131 can be a U-shaped resonator, which includes two second coupling sections 1311 and a second connecting section 1312. The two second coupling sections 1311 are spaced apart along the first direction X and are parallel to the transmission section 111. The two ends of the second connecting section 1312 are respectively connected to the ends of the two second coupling sections 1311 that are away from the signal input of the transmission section 111.

[0084] In this way, the open structure of the U-shaped resonator can form an efficient edge coupling mechanism with the transmission section 111, and the two parallel first coupling sections 1211 or second coupling sections 1311 can participate in energy exchange simultaneously, enhancing the electromagnetic coupling efficiency. In addition, the structure of the U-shaped resonator can realize a longer current path in a finite plane, which is beneficial to obtaining the required resonant frequency in a compact size, thereby realizing the miniaturization design of the dual-band indoor antenna 10.

[0085] When the frequency of the input signal is within the passband of the first resonator 121, the first resonator 121 selectively couples the signal energy in the transmission section 111 to the first output feed line group 120 through the electromagnetic coupling mechanism, and then transmits the energy to the antenna radiation group 210 through the first metallized via 120a, the first via 310 and the third metallized via 2113, and finally radiates the first frequency band signal.

[0086] Similarly, when the input signal frequency is within the passband of the second resonator 131, the second resonator 131 selectively couples the signal energy in the transmission section 111 to the second output feed line group 130 through the electromagnetic coupling mechanism, and then transmits the energy to the antenna radiation group 210 through the second metallized via 130a, the second via 320 and the fourth metallized via 2123, ultimately realizing the radiation of the second frequency band signal.

[0087] This configuration not only enables effective separation and independent transmission of dual-band signals, but also ensures efficient coupling and transmission of signals in each band through the size optimization of the first resonator 121 and the second resonator 131. At the same time, the compact structural arrangement is conducive to the miniaturization and integration design of the dual-band indoor antenna 10.

[0088] Continue to refer to Figure 2 The first output feed line 122 may include a first grounding portion 1221, a first coupling portion 1222, and a first output portion 1223 connected in sequence. The first output portion 1223 is configured to form a first metallized via 120a, and the first metallized via 120a is electrically connected to the first output portion 1223.

[0089] The first grounding portion 1221 is configured to form a seventh through-hole 120b, which is electrically connected to the first grounding portion 1221 and the ground plane 300. Thus, the seventh through-hole 120b, the first grounding portion 1221, and the ground plane 300 form an LC resonant circuit, which is connected in parallel with the first output portion 1223. When the signal energy of the second frequency band is transmitted to this LC resonant circuit, it exhibits extremely low impedance at the resonant frequency point of the second frequency band. Most of the signal energy is short-circuited to the ground plane 300 through this path and cannot continue to be transmitted, thereby forming a transmission zero point at the operating frequency point of the second frequency band. This suppresses the transmission of the second frequency band signal to the first output portion 1223, improving the isolation performance between the dual-frequency signals and avoiding mutual interference between signals of different frequency bands. Simultaneously, the use of additional filtering components is eliminated, helping to maintain the compact structure of the dual-frequency indoor distributed antenna 10.

[0090] Similarly, the second output feed line 132 may include a second grounding portion 1321, a second coupling portion 1322 and a second output portion 1323 connected in sequence. The second output portion 1323 is configured to form a second metallized via 130a, and the second metallized via 130a is electrically connected to the second output portion 1323.

[0091] The second grounding portion 1321 is configured to form an eighth through-hole 130b, which is electrically connected to the second grounding portion 1321 and to the ground plane 300. The eighth through-hole 130b, the second grounding portion 1321, and the ground plane 300 together form an LC resonant circuit and are connected in parallel with the second output portion 1323. When the signal energy of the first frequency band is transmitted to this LC resonant circuit, it exhibits extremely low impedance at the resonant frequency point of the first frequency band. The signal energy is short-circuited to the ground plane 300, thereby forming a transmission zero point at the operating frequency point of the first frequency band, suppressing the transmission of the first frequency band signal to the second output portion 1323, and thus suppressing the transmission of the first frequency band signal to the second output feeder 132.

[0092] In some embodiments, the first coupling portion 1222 may include a first portion A and a second portion B, and a first grounding portion 1221 is located at the end of the first portion A opposite to the second portion B. A first output portion 1223 is disposed at the end of the second portion B opposite to the transmission segment 111 along the first direction X.

[0093] The first part A is parallel to the extension direction of the transmission segment 111 and maintains stable electromagnetic coupling with it. The second part B is located at the end of the first part A away from the signal input of the transmission segment 111, and extends along the first direction X to provide path guidance for the transmission of low-frequency signals. In this way, the first part A and the second part B can form an L-shaped structure, which can improve the coupling path within a limited space, thereby improving energy transmission efficiency.

[0094] The second coupling part 1322 may include a third part C and a fourth part D. The second grounding part 1321 is located at one end of the third part C away from the fourth part D. The second output part 1323 is disposed at one end of the fourth part D away from the transmission section 111 along the first direction X.

[0095] The third part C is parallel to the extension direction of the transmission segment 111 and maintains stable electromagnetic coupling with the transmission segment 111. The fourth part D is located at the end of the third part C away from the signal input of the transmission segment 111, and the fourth part D extends along the first direction X to provide path guidance for the transmission of high-frequency signals.

[0096] Reference Figure 1 The antenna radiating group 210 includes a first radiating element 211 and a second radiating element 212. The first radiating element 211 is used to receive and radiate low-frequency signals from the first output feed line group 120. The second radiating element 212 is used to receive and radiate high-frequency signals from the second output feed line group 130. The first radiating element 211 and the second radiating element 212 can form a stable radiation field distribution within their respective operating frequency bands, ensuring the independent radiation characteristics of the dual-frequency signals.

[0097] The first radiating unit 211 includes a first sector-shaped patch 2111, and the first radiating unit 211 is configured to form a third metallized via 2113. The third metallized via 2113 serves as a feed point and can receive low-frequency signals from the first output feed line group 120. The first sector-shaped patch 2111, the second dielectric substrate 200, and the ground plane 300 together constitute the first patch resonator.

[0098] The third metallized via 2113 can be located on the angle bisector of the first sector patch 2111. This ensures that the excitation signal can excite the TM on the first sector patch 2111. 02 The mode suppresses other unnecessary resonant modes, thereby forming a symmetrical current distribution on the surface of the first sector patch 2111, avoiding radiation pattern distortion caused by asymmetrical current distribution, and ensuring the symmetry and stability of the beam of the dual-frequency indoor antenna 10 in the radiation direction.

[0099] The second radiating unit 212 includes a second sector patch 2121. The second radiating unit 212 is configured to form a fourth metallized via 2123, which serves as a feed point to receive high-frequency signals from the second output feed line group 130. The fourth metallized via 2123 can be located on the angle bisector of the second sector patch 2121, thus ensuring that the excitation signal can excite the TM on the second sector patch 2121. 02 The current distribution is symmetrical on the surface of the second sector patch 2121, while suppressing other unnecessary resonant modes.

[0100] It should be noted that the resonant frequency of an antenna is inversely proportional to the physical size of its radiating patch. Therefore, the first radiating element 211, operating in the low-frequency band, requires a larger radius for the first sector patch 2111 to achieve the desired low-frequency resonance. Conversely, the second radiating element 212, operating in the high-frequency band, requires a smaller radius for the second sector patch 2121 to achieve the desired high-frequency resonance. Therefore, in this embodiment, the radius of the first sector patch 2111 is larger than the radius of the second sector patch 2121.

[0101] In addition, in this embodiment, the fan-shaped shape of the first fan-shaped patch 2111 and the second fan-shaped patch 2121 can reduce the physical area occupied on the surface of the second dielectric substrate 200, thereby reducing the physical space occupied while maintaining the effective radiation area, which is beneficial to achieving the requirements of low profile and compactness of the dual-band indoor antenna 10.

[0102] The first sector patch 2111 and the second sector patch 2121 can be arranged at intervals along the first direction X. The direction of the first straight line where the center of the first sector patch 2111 and the center of the second sector patch 2121 are located is parallel to the first direction, and the arc edge of the first sector patch 2111 and the arc edge of the second sector patch 2121 are located on the same side of the first direction.

[0103] The apex angles of the first sector patch 2111 and the second sector patch 2121 are set to 90°. This allows for the guidance of surface current to form a TM while ensuring that the first radiating element 211 and the second radiating element 212 meet the electrical dimensions required for a specific frequency band. 02 The symmetrical distribution mode optimizes the phase distribution characteristics of the radiation field of the dual-frequency indoor antenna 10, thereby improving the beam symmetry and stability of the radiation pattern.

[0104] The first sector-shaped patch 2111 also forms a plurality of fifth metallized vias 2112. In this embodiment, the fifth metallized via 2112 refers to a conductive via with an inner wall covered by a metal layer that penetrates the second dielectric substrate 200. The plurality of fifth metallized vias 2112 are arranged along the arcuate direction of the first sector-shaped patch 2111 to form a quarter-moment (TM) 01 Substrate Integrated Waveguide (SIW) resonators; the spacing between every two adjacent fifth metallized vias 2112 forms a first coupling window. The distance between the first coupling windows is set between one-quarter of the guided wave wavelength and one guided wave wavelength of the first frequency band signal, thereby forming a resonant mode (TM) that can resonate with the first sector patch resonant mode. 02 A composite resonant structure that performs electromagnetic coupling.

[0105] The fifth metallized via 2112, arranged along an arc, can adjust the distance of the first coupling window to enable the patch resonant mode (TM) of the first sector patch 2111. 02 ) and SIW resonant mode (TM 01 A controllable electromagnetic coupling is formed between them. By utilizing the moderate coupling provided by the fifth metallized via 2112, two resonant modes are simultaneously excited.

[0106] Specifically, the first SIW resonator establishes an equivalent electric wall through the fifth metallized via 2112, forming a first sector-shaped SIW resonator, i.e., a quarter-mode (TM), in the second dielectric substrate 200. 01 A circular SIW resonant structure is used to primarily excite and maintain one-quarter of the first frequency band of the TM band. 01 Resonant Mode. The first sector SIW resonator and the first sector patch 2111 achieve electromagnetic coupling through the first coupling window. The first sector SIW resonator dominates the TM mode. 01The pattern is established, and the first sector patch 2111 excites TM. 02 Pattern, TM 01 Patterns and TM 02 The mode generates a composite resonance effect in the frequency domain through near-field coupling, which can extend the impedance bandwidth of the first radiating element 211 and improve the stability of the low-frequency radiation pattern.

[0107] The fifth metallized via 2112 can be evenly arranged at equal angles along the arc direction of the first sector patch 2111, forming a symmetrical coupling boundary, thereby enabling TM 01 Pattern and TM 02 The electric field distribution of the model remains centrally symmetrical, and there is no directional radiation, thus improving the stability of the radiation pattern.

[0108] The second sector patch 2121 is configured to form a plurality of sixth metallized vias 2122, which are arranged along the arcuate direction of the second sector patch 2121. In this embodiment, the sixth metallized via 2122 refers to a conductive via with an inner wall covered by a metal layer that penetrates the second dielectric substrate 200. The spacing between each pair of adjacent sixth metallized vias 2122 forms a second coupling window. The distance between the second coupling windows is set between one-quarter of the guided wave wavelength and one guided wave wavelength of the second frequency band signal, thereby forming a resonant mode (TM) that can resonate with the second sector patch 2121. 02 A composite resonant structure that performs electromagnetic coupling.

[0109] The sixth metallized via 2122, arranged along an arc-shaped direction, can adjust the distance of the second coupling window to achieve the patch resonant mode (TM) of the second sector patch 2121. 02 ) and SIW resonant mode (TM 01 A controllable electromagnetic coupling is formed between them. By utilizing the moderate coupling provided by the sixth metallized via 2122, two resonant modes are simultaneously excited.

[0110] Specifically, the second SIW resonator establishes an equivalent electric wall through the sixth metallized via 2122, forming a second sector-shaped SIW resonator, i.e., a quarter-mode (TM), in the second dielectric substrate 200. 01 A circular SIW resonant structure is used to primarily excite and maintain one-quarter of the second frequency band of the TM. 01 Resonant Mode. The second sector SIW resonator and the second sector patch 2121 are electromagnetically coupled through the second coupling window. The second sector SIW resonator dominates the TM mode. 01 The pattern is established, and the second sector patch 2121 excites TM. 02 Pattern, TM 01 Patterns and TM 02The mode generates a composite resonance effect in the frequency domain through near-field coupling, which can extend the impedance bandwidth of the second radiating element 212 and improve the stability of the low-frequency radiation pattern.

[0111] Figure 3 A schematic diagram showing partial dimensions of a dual-band indoor distributed antenna provided in this application, along with its corresponding dimensional parameter table. (Refer to...) Figure 3 In some possible embodiments, in the dual-band indoor antenna 10 of this application, the relative permittivity εr of the first dielectric substrate 100 and the second dielectric substrate 200 can be 2.2, and the loss tangent tanδ of the first dielectric substrate 100 and the second dielectric substrate 200 can be 0.0009.

[0112] An exemplary size design of the dual-band indoor distributed antenna of this application embodiment is as follows: the thickness of the first dielectric substrate 100 is 0.5 mm, and the thickness of the second dielectric substrate 200 is 3 mm.

[0113] The lengths W of the first dielectric substrate 100 and the second dielectric substrate 200 s The width W of the first dielectric substrate 100 and the second dielectric substrate 200 is 150mm. ss It is 80mm.

[0114] The length of transmission segment 111 is 31mm, and the width of transmission segment 111 is W. 14 The length l of the power input section 112 is 1.5mm. 11 The width W of the power input section 112 is 5mm. 11 The length l of impedance transformation section 113 is 3mm. 12 The width W of impedance transformation section 113 is 31mm. 12 The length is 1.8mm, matching the length of branch 114. 13 The width W is 12mm, matching the width of branch 114. 13 It is 0.9mm.

[0115] The length of the first resonator 121 is 2l 21 The width W of the first resonator 121 is 60.6 mm. 21 The coupling distance g2 between the first resonator 121 and the transmission section 111 is 0.1 mm, and the length 2l of the second resonator 131 is 0.7 mm. 31 The width W of the second resonator 131 is 48mm. 31 The coupling distance g1 between the second resonator 131 and the transmission section 111 is 0.1 mm, which is 0.7 mm.

[0116] The length W of the first grounding part 1221 41 The width W of the first grounding portion 1221 is 1.5mm.41 The length is 1.5mm; the length l of the first coupling part 1222 42 -l 43 The width W of the first coupling part 1222 is 27mm. 42 The length l of the first output section 1223 is 0.3mm. 43 The width W of the first output section 1223 is 5.9mm. 43 The coupling distance g between the first output feed line 122 and the first resonator 121 is 1.2mm. 22 It is 0.5mm.

[0117] The length W of the second grounding part 1321 51 The width W of the second grounding part 1321 is 1.5mm. 51 The length of the second coupling part 1322 is 1.5mm; 52 -l 53 The width W of the second coupling part 1322 is 22.7 mm. 52 The length l of the second output section 1323 is 0.3mm. 53 The width W of the second output section 1323 is 6mm. 53 The coupling distance g between the second output feed line 132 and the second resonator 131 is 1.4mm. 11 It is 0.5mm.

[0118] The diameters of the first metallized through-hole 120a and the second metallized through-hole 130a are 0.5 mm; the diameter of the third metallized through-hole 2113 is r. 11 The diameter r of the fourth metallized through-hole 2123 is 0.5mm. 22 The diameter of the fifth metallized through hole 2112 is 0.7 mm, and the diameter of the sixth metallized through hole 2122 is 0.7 mm; the diameter of the first through hole 310 and the second through hole 320 is 1 mm; the diameter of the seventh through hole 120b is 0.5 mm, and the diameter of the eighth through hole 130b is 0.5 mm.

[0119] The radius W of the first sector patch 2111 p1 The radius W of the second sector patch 2121 is 55mm. p2The diameter is 44.1 mm. The central angle of the first sector patch 2111 is 90°, and the central angle of the second sector patch 2121 is 90°. The distance x1 between the third metallized through hole 2113 and the radial edge of the first sector patch 2111 is 10 mm, and the distance x2 between the fourth metallized through hole 2123 and the radial edge of the second sector patch 2121 is 8.4 mm. The distance d1 between the fifth metallized through hole 2112 and the center of the first sector patch 2111 is 34.1 mm, and the distance d2 between the sixth metallized through hole 2122 and the center of the second sector patch 2121 is 26.8 mm. The angle φ1 formed by the center of the first sector patch 2111 and the line connecting the centers of the two adjacent fifth metallized vias 2112 is 4.5°, and the angle φ2 formed by the center of the second sector patch 2121 and the line connecting the centers of the two adjacent sixth metallized vias 2122 is 4.5°.

[0120] Figure 4 The S-parameter simulation curves of the dual-band indoor antenna feed network provided in the embodiments of this application are shown. (Refer to...) Figure 4 The dual-band indoor distributed antenna 10 provided in this application has passband center frequencies of 1.88 GHz and 2.36 GHz for the first and second frequency bands, respectively. A transmission pole is observed within each passband, and the return loss within each passband is better than 20 dB. The insertion loss of both the first output feed group 120 and the second output feed group 130 is less than 0.3 dB, indicating extremely high signal transmission efficiency. Simultaneously, the isolation between the output ports of the first output feed group 120 and the second output feed group 130 is greater than 20 dB within the operating frequency band, indicating that the dual-band indoor distributed antenna 10 of this application can effectively suppress mutual interference between the first and second frequency band signals.

[0121] Figure 5 The S-parameter curve of the dual-band indoor distribution antenna provided in the embodiments of this application is shown in the figure. (Refer to...) Figure 5 The dual-band indoor distributed antenna 10 provided in this application embodiment exhibits three distinct radiation poles in both the low-frequency and high-frequency bands, thereby expanding the operating bandwidth. Specifically, the dual-band indoor distributed antenna 10 achieves a -10dB relative bandwidth of 7.5% in the low-frequency band (1.79-1.93GHz) and an -10dB relative bandwidth of 8.1% in the high-frequency band (2.26-2.45GHz), demonstrating excellent broadband characteristics.

[0122] Figure 6 The gain characteristic curve of the dual-band indoor distribution antenna provided in the embodiments of this application is shown. (Refer to...) Figure 6 The dual-band indoor distributed antenna 10 provided in this application embodiment can maintain stable gain performance within its respective operating frequency band, with a maximum gain of 6.9 dBi in the low-frequency band and a maximum gain of 5.4 dBi in the high-frequency band, meeting the requirements of indoor distributed systems for antenna radiation performance.

[0123] Figure 7 The radiation patterns of the dual-band indoor distributed antenna provided in this application at two characteristic frequency points, 1.92 GHz and 2.44 GHz, are shown in the figure. Figure 7 In the middle (a), the radiation pattern of the E-plane at 1.92 GHz is shown. Figure 7 (b) shows the H-plane radiation pattern at 1.92 GHz. Figure 7 In the middle (c), the radiation pattern of the E-plane is at 2.44 GHz. Figure 7 The middle (d) diagram shows the H-plane radiation pattern at 2.44 GHz. 1.92 GHz corresponds to the characteristic frequency of the low-frequency passband, and 2.44 GHz corresponds to the characteristic frequency of the high-frequency passband. The radiation pattern at each frequency point includes the radiation field distribution of two orthogonal planes: the E-plane (the plane containing the electric field vector) and the H-plane (the plane containing the magnetic field vector).

[0124] Reference Figure 7 At a frequency of 1.92 GHz, both the E-plane and H-plane radiation patterns exhibit stable directional radiation characteristics, with a clearly defined main lobe direction and low sidelobe levels. At a frequency of 2.44 GHz, the radiation pattern maintains a similar beam shape and directional characteristics to the low-frequency band. Therefore, the dual-band indoor distributed antenna 10 provided in this application embodiment has highly consistent radiation characteristics across different operating frequency bands, with a stable main lobe direction and effectively controlled sidelobe levels, thereby achieving reliable and stable radiation performance over a wide bandwidth.

[0125] It should be noted that the terms "an embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," etc., mentioned in the specification may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Additionally, when describing a specific feature, structure, or characteristic in conjunction with embodiments, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0126] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "one" can be understood to convey either singular or plural usage.

[0127] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0128] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90° or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A dual-band indoor distributed antenna for 5G / 6G, characterized in that, include: A first dielectric substrate has an input feed line, a first output feed line group, and a second output feed line group disposed on its upper surface. The input feed line includes a transmission segment. The first and second output feed line groups are located on opposite sides of the transmission segment along a first direction, which is perpendicular to the extension direction of the input feed line and perpendicular to the thickness direction of the first dielectric substrate. The transmission segment couples signals to the first and second output feed line groups. The first output feed line group is configured to transmit a first frequency band signal, and the second output feed line group is configured to transmit a second frequency band signal. The first output feed line group includes a first resonator and a first output feed line. The first resonator is disposed on one side of the transmission segment along the first direction, and the first output feed line is disposed on the side of the first resonator opposite to the transmission segment along the first direction. The second output feed line group includes a second resonator and a second output feed line. The second resonator is disposed on the side of the transmission segment opposite to the first resonator along the first direction, and the second output feed line is disposed on the side of the second resonator opposite to the transmission segment along the first direction. The size of the second resonator is smaller than the size of the first resonator. A second dielectric substrate has an antenna radiating group disposed on its upper surface. The antenna radiating group is used to radiate the first frequency band signal and the second frequency band signal. The antenna radiating group includes a first radiating element and a second radiating element arranged at intervals. The ground plane, the first dielectric substrate, the ground plane and the second dielectric substrate are stacked along the thickness direction of the first dielectric substrate.

2. The dual-frequency indoor distribution antenna according to claim 1, characterized in that, The first output feed group is configured to form a first metallized via, which is electrically connected to the first output feed group; the second output feed group is configured to form a second metallized via, which is electrically connected to the second output feed group. The antenna radiating group is configured to form a third metallized via and a fourth metallized via, which are electrically connected to the antenna radiating group respectively. The ground plane is configured to form a first through hole and a second through hole, the first through hole and the second through hole being electrically isolated from the ground plane; Wherein, the first metallized via, the third metallized via, and the first via are aligned along the thickness direction of the first dielectric substrate; the first metallized via and the third metallized via are electrically connected to enable the signal of the first frequency band of the first output feed line group to be transmitted to the antenna radiating group. The second metallized via, the fourth metallized via, and the second via are aligned along the thickness direction of the first dielectric substrate; the second metallized via and the fourth metallized via are electrically connected to transmit the signal of the second frequency band of the second output feed line group to the antenna radiating group.

3. The dual-frequency indoor distribution antenna according to claim 1, characterized in that, When the frequency of the input signal is within the passband of the first resonator, the first resonator couples the signal energy from the transmission section to the first output feed group, and the first output feed group transmits the signal energy to the first radiating unit to radiate the first frequency band signal. When the frequency of the input signal is within the passband of the second resonator, the second resonator couples the signal energy from the transmission section to the second output feed group, and the second output feed group transmits the signal energy to the second radiation unit to radiate the second frequency band signal; The size of the second resonator is smaller than that of the first resonator.

4. The dual-frequency indoor distribution antenna according to claim 3, characterized in that, The first resonator is a U-shaped resonator, which includes two first coupling sections and a first connecting section. The two first coupling sections are spaced apart along the first direction and are parallel to the transmission section. The two ends of the first connecting section are respectively connected to the ends of the two first coupling sections that are away from the signal input of the transmission section. The second resonator is a U-shaped resonator, which includes two second coupling sections and a second connecting section. The two second coupling sections are spaced apart along the first direction and are parallel to the transmission section. The two ends of the second connecting section are respectively connected to the ends of the two second coupling sections that are away from the signal input of the transmission section.

5. The dual-frequency indoor distribution antenna according to claim 2, characterized in that, The first output feed line includes a first grounding portion, a first coupling portion, and a first output portion connected in sequence. The first grounding portion is configured to form a seventh via, which is electrically connected to the first grounding portion and to the ground plane. The seventh via is configured to generate a transmission null point in the second frequency band to suppress the transmission of the second frequency band signal to the first output feed line. The first output portion is configured to form a first metallized via, which is electrically connected to the first output portion. The second output feed line includes a second grounding portion, a second coupling portion, and a second output portion connected in sequence. The second grounding portion is configured to form an eighth via, which is electrically connected to the second grounding portion and to the ground plane. The eighth via is configured to generate a transmission zero in the first frequency band to suppress the transmission of the first frequency band signal to the second output feed line. The second output portion is configured to form a second metallized via, which is electrically connected to the second output portion.

6. The dual-frequency indoor distribution antenna according to claim 5, characterized in that, The first coupling portion includes a first part and a second part. The first part is parallel to the extension direction of the transmission segment, and the second part is located at the end of the first part away from the signal input of the transmission segment, and the second part extends along the first direction. The first grounding portion is located at one end of the first portion away from the second portion, and the first output portion is located at one end of the second portion away from the transmission segment along the first direction; The second coupling portion includes a third portion and a fourth portion. The third portion is parallel to the extension direction of the transmission segment, and the fourth portion is located at the end of the third portion away from the signal input of the transmission segment, and the fourth portion extends along the first direction. The second grounding portion is located at one end of the third portion away from the fourth portion, and the second output portion is located at one end of the fourth portion away from the transmission segment along the first direction.

7. The dual-frequency indoor distribution antenna according to claim 2, characterized in that, The first radiating unit is configured to form the third metallized via; the first radiating unit includes a first sector patch, and the third metallized via is located on the angle bisector of the first sector patch; The second radiating unit is configured to form the fourth metallized via; the second radiating unit includes a second sector patch, and the fourth metallized via is located on the angle bisector of the second sector patch; The radius of the first sector patch is larger than the radius of the second sector patch.

8. The dual-frequency indoor distribution antenna according to claim 7, characterized in that, The first sector patch is constructed to form a plurality of fifth metallized vias, which are arranged along the arc direction of the first sector patch, and the interval between each two adjacent fifth metallized vias forms a first coupling window. The second sector patch is constructed to form a plurality of sixth metallized vias, which are arranged along the arc direction of the second sector patch. The interval between each two adjacent sixth metallized vias is constructed to form a second coupling window.

9. The dual-frequency indoor distribution antenna according to claim 2, characterized in that, The diameters of the first metallized through-hole, the second metallized through-hole, the third metallized through-hole, and the fourth metallized through-hole are equal, and the diameters of the first through-hole and the second through-hole are respectively larger than the diameter of the first metallized through-hole. The first metallized via and the third metallized via are electrically connected through a first conductor, which passes through the first via and is electrically isolated from the first via. The second metallized via is electrically connected to the fourth metallized via through a second conductor, which passes through the second via and is electrically isolated from the second via.

10. The dual-frequency indoor distribution antenna according to any one of claims 1-5, characterized in that, The input feed line also includes: A power input section, wherein the power input section is used to receive radio frequency signals from an external circuit; An impedance transformation section, which is a quarter-wavelength microstrip line, is provided. One end of the impedance transformation section is connected to the output end of the feed input section, and the other end is connected to the transmission section, thereby realizing impedance transformation from the feed input section to the transmission section. Matching stubs, wherein the matching stubs are connected in parallel to the impedance transformation section; The radio frequency signal sequentially passes through the power input section, the impedance transformation section, and the matching stub before entering the transmission section.

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