An antenna system

Abstract

An antenna system is disclosed for improving the isolation of the antenna system. The antenna system includes: a first antenna, a second antenna, a decoupling structure and a reflector, the decoupling structure includes at least three interference structures of the same structure located in the same plane, the at least three interference structures of the same structure are periodically arranged on the plane, and the length period of the periodic arrangement is less than 1.3 times the size of the interference structure. The plane where the decoupling structure is located is parallel to the line between the first antenna and the second antenna, and the decoupling structure is located in the space surrounded by the first antenna, the second antenna and the reflector.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communications, and in particular, to an antenna system. Background Art

[0002] In a multiple-in multiple-out (MIMO) system, the antenna system includes multiple antennas. The antenna not only receives electromagnetic waves emitted by other devices, but also receives electromagnetic waves emitted by adjacent antennas, generating electromagnetic induction coupling and obtaining erroneous signals. The erroneous signals affect normal communication and data transmission and reduce the isolation between antennas. Summary of the invention

[0003] The present application provides an antenna system, which improves the isolation of the antenna system.

[0004] A first aspect provides an antenna system:

[0005] The antenna system comprises a first antenna of a planar dipole antenna type, a second antenna, a reflector plate serving as an isolation circuit, and a decoupling structure for cooperating with the reflector plate to eliminate electromagnetic induction coupling between antennas.

[0006] The decoupling structure includes at least three identical interference structures for destructively interfering electromagnetic waves. The at least three identical interference structures are located in the same plane. Each interference structure includes at least one ring structure, which can be a square ring structure, a circular ring structure or a regular hexagonal ring structure.

[0007] At least three identical interference structures are periodically arranged on the plane where they are located, and the length period of the periodic arrangement is less than 1.3 times the size of the interference structure. For example, when the ring structure is a square ring structure, the length period of the periodic arrangement is less than 1.3 times the side length of the largest square ring structure in at least one ring structure in the interference structure; when the ring structure is a circular ring structure, the length period of the periodic arrangement is less than 1.3 times the diameter of at least one ring structure in the interference structure; when the ring structure is a regular polygonal structure such as a regular hexagon or a regular octagon, the length period of the periodic arrangement is less than 1.3 times the distance between two parallel sides in at least one ring structure in the interference structure.

[0008] The plane where at least three identical interference structures are located is parallel to the line between the first antenna and the second antenna, and the decoupling structure is located in a space with the first antenna and the second antenna at the top and the reflector at the bottom, and the edge does not exceed the farthest side of the first antenna and the second antenna.

[0009] According to experimental results, when the length period of the periodic arrangement is less than 1.3 times the size of the largest ring structure in the interference structure, it has a strong absorption effect on electromagnetic waves whose angle with the normal of the plane in which the interference structure is located is greater than or equal to 60° and less than 80°. Since the incident angle of some electromagnetic waves that affect the isolation in the actual antenna system is 60°-80° with the normal of the plane of the decoupling structure, the electromagnetic waves reflected from the first antenna through the reflector to the second antenna can be absorbed, thereby improving the isolation between the first antenna and the second antenna.

[0010] At the same time, the space surrounded by the first antenna, the second antenna and the reflector itself exists in a conventional antenna system that does not include a decoupling structure. The decoupling structure is located in this space without increasing the volume of the conventional antenna system or the cross-sectional height of the antenna, thereby improving the miniaturization capability of the antenna system.

[0011] Based on the first aspect, in a first implementation of the first aspect:

[0012] The decoupling structure includes at least four identical interference structures.

[0013] According to experimental results, the more identical interference structural parts there are, the stronger the ability to absorb electromagnetic waves is.

[0014] Based on the first aspect or the first embodiment of the first aspect, in the second embodiment of the first aspect:

[0015] The circumference of the largest ring structure in at least one ring structure is smaller than the working wavelength of the antenna system and larger than 0.4 times the working wavelength of the antenna system. The working wavelength is the wavelength of the electromagnetic wave emitted by the first antenna or the second antenna in free space.

[0016] When the circumference of the largest ring structure in the interference structure is less than the working wavelength of the antenna system and greater than 0.4 times the working wavelength of the antenna system, it is determined according to experimental results that the interference structure can absorb electromagnetic waves of a frequency corresponding to the working wavelength of the antenna system.

[0017] Based on the first aspect, the first implementation of the first aspect, or the second implementation of the first aspect, in a third implementation of the first aspect:

[0018] The interference structure can be circular or square, can be multiple rings or one ring, the ring structure can be a gap type, that is, a ring structure is constructed on a metal base plate, and the ring structure can be a patch type, that is, a ring patch is attached to a dielectric substrate. The interference structure in this application can be a double-ring gap type structure or a double-ring patch type structure.

[0019] Based on the first aspect and the first to third implementations of the first aspect, in a fourth implementation of the first aspect:

[0020] The at least three identical interference structures include at least two columns of interference structures, wherein the size of the largest loop structure in a first column of interference structures in the two columns of interference structures is different from the size of the largest loop structure in a second column of interference structures.

[0021] According to experimental results, the size of the maximum loop structure in each column of interference structural parts is related to the frequency range of electromagnetic waves absorbed by the interference structural parts. When at least three interference structural parts include two columns of interference structural parts with different sizes of maximum loop structures, the frequency range of electromagnetic waves absorbed by each column of interference structural parts is different. The more columns of interference structural parts with different sizes of maximum loop structures included in the decoupling structure, the larger the frequency range of electromagnetic waves absorbed will be.

[0022] Based on the first aspect and the first to fourth implementations of the first aspect, in a fifth implementation of the first aspect:

[0023] The decoupling structure is located in the space surrounded by the first antenna, the second antenna and the reflector and is parallel to the line connecting the first antenna and the second antenna. There is a gap between the first antenna and the second antenna. Some interference structures in the decoupling structure may be completely or partially located below the gap between the first antenna and the second antenna. This part of the interference structure is called an intersecting interference structure, that is, the orthographic projection of the intersecting interference structure on the reflector intersects with the orthographic projection of the first antenna or the second antenna on the reflector.

[0024] When the orthographic projection of the interference structure in the decoupling structure on the reflector intersects with the first antenna or the second antenna, experimental results show that the intersecting interference structure has a strong absorption capacity for electromagnetic waves radiated from the first antenna or the second antenna in a small angle range directly below.

[0025] Based on the first aspect and the first to fifth implementations of the first aspect, in a sixth implementation of the first aspect:

[0026] The decoupling structure is located in the space surrounded by the first antenna, the second antenna and the reflector and is parallel to the line connecting the first antenna and the second antenna. There is a gap between the first antenna and the second antenna. Some interference structures in the decoupling structure are completely located below the gap between the first antenna and the second antenna. This part of the interference structure is called a separated interference structure, that is, the orthographic projection of the separated interference structure on the reflector is separated from the orthographic projection of the first antenna or the second antenna on the reflector.

[0027] When the interference structure in the decoupling structure is separated from the first antenna or the second antenna by its orthographic projection on the reflecting plate, according to experimental results, the separated interference structure has a strong absorption capacity for electromagnetic waves radiated downward by the first antenna and reflected by the reflecting plate to reach the second antenna over a large angle range.

[0028] Based on the first aspect and the first to sixth implementations of the first aspect, in the seventh implementation of the first aspect:

[0029] The distance between the plane where at least three interference structures in the decoupling structure are located and the reflector is greater than or equal to 0.1 times the working wavelength of the antenna system, the distance between the plane where at least three interference structures are located and the reflector is less than the distance between the first antenna or the second antenna and the reflector, and the difference between the two distances is less than 0.25 times the working wavelength.

[0030] A second aspect provides a wireless device:

[0031] The wireless device includes the antenna system of the first aspect and the first to eighth embodiments of the first aspect, and the wireless device includes a radio frequency chip, which is used to send and receive radio frequency signals according to the antenna system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Provides a multi-antenna wireless device architecture;

[0033] Figure 2 It is a schematic diagram of the principle of electromagnetic induction coupling of the antenna system;

[0034] Figure 3A A schematic diagram of the principle of eliminating electromagnetic induction coupling in the antenna system in an embodiment of the present application;

[0035] Figure 3B This is a schematic diagram of the principle of the arrangement period of the decoupling structural components in the embodiment of the present application;

[0036] Figure 3C This is a schematic diagram of the types of periodic units in the embodiments of the present application;

[0037] Figure 3D This is a schematic diagram of the dimensions of the periodic unit in the embodiment of the present application;

[0038] Figure 4 A schematic diagram of the structure of an antenna system in an embodiment of the present application;

[0039] Figure 5 This is an isolation simulation data diagram of the antenna system in the embodiment of the present application;

[0040] Figure 6 A return loss simulation data diagram of the antenna system in the embodiment of the present application;

[0041] Figure 7 Another schematic diagram of the structure of the antenna system in the embodiment of the present application;

[0042] Figure 8 Another schematic diagram of the structure of the antenna system in the embodiment of the present application;

[0043] Fig. 9 Another isolation simulation data diagram of the antenna system in the embodiment of the present application;

[0044] Fig.10 Another return loss simulation data diagram of the antenna system in the embodiment of the present application;

[0045] Fig.11 Another schematic diagram of the structure of the antenna system in the embodiment of the present application;

[0046] Fig.12 Another schematic diagram of the structure of the antenna system in the embodiment of the present application;

[0047] Fig.13 Another schematic diagram of the structure of the antenna system in the embodiment of the present application;

[0048] Fig.14 Another isolation simulation data diagram of the antenna system in the embodiment of the present application;

[0049] Fig.15A Another return loss simulation data diagram of the antenna system in the embodiment of the present application;

[0050] Fig. 15B A gain simulation data diagram of the antenna system in the embodiment of the present application;

[0051] Fig.16 Another schematic diagram of the structure of the antenna system in the embodiment of the present application;

[0052] Fig.17 Another isolation simulation data diagram of the antenna system in the embodiment of the present application;

[0053] Fig.18A Another return loss simulation data diagram of the antenna system in the embodiment of the present application;

[0054] Fig.18B FIG. 4 is another gain simulation data diagram of the antenna system in the embodiment of the present application. DETAILED DESCRIPTION

[0055] An embodiment of the present application provides an antenna system for absorbing electromagnetic waves in a specific propagation path between multiple antennas, thereby improving the isolation of the antenna system, reducing the cross-sectional height of the antenna system, and improving the miniaturization capability of the antenna system.

[0056] The embodiments of the present application can be applied to Figure 1 Multi-antenna wireless device architecture shown:

[0057] The multi-antenna wireless device architecture includes a first network device and a second network device. The first network device includes n antennas from S1 to Sn, and the second network device includes n antennas from R1 to Rn. The first network device and the second network device communicate with each other through multiple antennas.

[0058] Figure 1 The multiple antennas in the multi-antenna wireless device architecture shown in the figure may have MIMO functions or other functions, which are not limited here. The following only takes the multiple antennas having MIMO functions as an example. Figure 1 The multi-antenna wireless device architecture shown is introduced: the antenna in the first network device or the second network device has the functions of receiving and transmitting. For the convenience of description, only the first network device is used as the transmitting end and the second network device is used as the receiving end.

[0059] In the first network device, the information data stream from the information source, after reaching the space-time encoder, forms a vector output that is simultaneously transmitted from antenna S1 to antenna Sn. These modulation symbols are called space-time vector symbols. The space-time vector symbol with the direction from antenna S1 to antenna R1 is h 11 , the direction is the space-time vector from antenna Sn to antenna Rn, and the symbol is h nn .

[0060] In the second network device, after antenna R1 to antenna Rn receive the space-time vector symbols sent by antenna S1 to antenna Sn, the space-time encoder maps the received space-time vector symbols according to space-time mapping to obtain a data information stream.

[0061] The antenna is a dipole antenna. There are many types of dipole antennas, including a linear dipole antenna and a planar dipole antenna, which are not specifically limited here.

[0062] In combination with the above introduction, the principle of improving the isolation in the antenna system in the embodiment of the present application is briefly introduced below. Figure 2 and Figure 3A ;

[0063] It should be noted that a multi-antenna wireless device may include multiple antennas. For ease of understanding, the present embodiment of the application only takes two antennas as an example to introduce the principle of improving isolation between the two antennas:

[0064] First, the principle of how electromagnetic waves affect the isolation of the antenna system in the existing antenna system is introduced. Figure 2 :

[0065] The existing antenna system includes a first antenna, a second antenna and a reflector. The first antenna and the second antenna are planar dipole antennas, wherein the electromagnetic waves that affect the isolation between the two antennas include two types, one type is the electromagnetic waves that the first antenna directly radiates to the second antenna, such as Figure 2 The other type is the electromagnetic wave emitted by the first antenna and reflected by the reflector to the second antenna. The electromagnetic wave emitted by the first antenna and reflected by the reflector includes two paths. One propagation path is the electromagnetic wave emitted by the first antenna and reflected by the reflector once to the second antenna. Figure 2 The other propagation path is the electromagnetic wave transmitted by the first antenna and reaching the second antenna through a complex propagation mode such as multiple reflections or refractions, as shown in the path 2 in FIG. Figure 2 As shown in path 3.

[0066] The distance between the centers of the first antenna and the second antenna is d, and the height from the upper surface of the first antenna or the second antenna to the surface of the reflector is h. Figure 2 In the electromagnetic waves of path 2, the electromagnetic waves passing through the reflection point on the reflector and having the same distance from the first antenna and the second antenna are selected as typical electromagnetic waves in path 2 for analysis and calculation, and it can be obtained that the tangent value of the angle θ between the incident electromagnetic wave and the normal line of the reflector is tanθ=d / 2h.

[0067] According to further analysis of actual antenna products, it can be concluded that in actual antenna products, the angle between the incident angle of the electromagnetic wave of path 2 and the normal of the reflector is in the range of 60°-80°.

[0068] It should be noted that the shape of the reflective plate can be a whole plate or divided into several parts. Here, only the whole plate is introduced without specific limitation.

[0069] Combination Figure 2 The principle of electromagnetic wave influence isolation in the existing antenna system is introduced in the following. The principle of eliminating electromagnetic induction coupling in the antenna system by setting a decoupling structure in the embodiment of the present application is introduced below. Figure 3A :

[0070] In the antenna system including the decoupling structure in the embodiment of the present application, the decoupling structure is arranged in the space surrounded by the first antenna, the second antenna and the reflector, and the plane where the decoupling structure is located is parallel to the line connecting the centers of the first antenna and the second antenna.

[0071] It should be noted that the decoupling structural member may be a whole or may be composed of multiple parts. In this embodiment, the decoupling structural member is taken as a whole as an example, and the specific structure of the decoupling structural member is not limited.

[0072] In the embodiment of the present application, the decoupling structure has an absorption effect on the electromagnetic waves emitted from the first antenna and reflected by the reflector to the second antenna, that is, Figure 2 Electromagnetic waves shown in paths 2 and 3. As it is concluded through analysis that in actual antenna products, the angle between the incident angle of the electromagnetic wave shown in path 2 and the plane of the reflector is 60°-80°, the decoupling structure in the embodiment of the present application has a strong absorption effect on electromagnetic waves whose incident angle is 60°-80° to the normal of the plane where the decoupling structure is located, and also has an absorption effect on electromagnetic waves whose incident angle is at other angles to the normal of the plane where the decoupling structure is located, but the absorption effect is relatively weaker than the absorption effect of electromagnetic waves whose incident angle is 60°-80° to the normal of the plane where the decoupling structure is located.

[0073] It should be noted that the decoupling structure in the embodiment of the present application can not only absorb electromagnetic waves with an incident angle of 60°-80° to the normal of the decoupling structure, but all decoupling structures used to absorb electromagnetic waves shown in path 2 in the antenna system are within the protection scope of the present application.

[0074] When the electromagnetic wave with propagation path 2 reaches the upper surface of the decoupling structure, its incident angle is 60°-80° with the normal of the plane where the decoupling structure is located, and will be absorbed by the decoupling structure; the electromagnetic wave with propagation path 3, after being emitted from the first antenna and reaching the reflector, is reflected multiple times between the decoupling structure and the reflector, and the absorption effect of the electromagnetic wave with propagation path 3 is achieved through the destructive interference between the transmitted wave and the reflected wave passing through the decoupling structure and the loss in the propagation path.

[0075] based on Figure 3A The principle of eliminating electromagnetic induction coupling in the antenna system by setting a decoupling structure in the embodiment of the present application is introduced below. The electromagnetic principle in the structural design of the decoupling structure in the embodiment of the present application is introduced as follows:

[0076] When the electromagnetic wave emitted by the antenna is incident on the decoupling structure, a portion of the incident electromagnetic wave is directly reflected by the decoupling structure to obtain a first reflected wave. How much of the incident electromagnetic wave is reflected is determined by the specific structure of the decoupling structure. In the embodiment of the present application, about half of the incident electromagnetic wave is directly reflected by the decoupling structure. Under the action of the decoupling structure, the first reflected wave undergoes a phase change relative to the incident electromagnetic wave, resulting in a phase difference.

[0077] Another part of the incident electromagnetic wave passes through the decoupling structure to obtain a first transmitted wave. Under the action of the decoupling structure, the first transmitted wave undergoes a phase change relative to the incident electromagnetic wave, thereby generating a phase difference.

[0078] The first transmitted wave is reflected by the metal reflector to obtain a second reflected wave. When the second reflected wave reaches the decoupling structure, it passes through the periodic unit in the decoupling structure to obtain a second transmitted wave. Under the action of the decoupling structure, the second transmitted wave further undergoes a phase change relative to the first transmitted wave, resulting in a phase difference. When the phase difference between the second transmitted wave and the first reflected wave is 180°, the second transmitted wave and the first reflected wave undergo destructive interference, causing the electromagnetic wave to be canceled out.

[0079] The decoupling structure controls the reflected and transmitted parts of the incident electromagnetic waves, and causes the electromagnetic waves that pass through the decoupling structure to have a phase difference and the accumulated phase difference reaches 180°, thereby achieving the effect of "absorbing" the electromagnetic waves.

[0080] Combination Figure 3A The electromagnetic principle of the decoupling structure to eliminate the electromagnetic induction coupling of the antenna system is introduced below. The electromagnetic principle of the specific structure of the decoupling structure in the embodiment of the present application is introduced as follows:

[0081] In the embodiment of the present application, the decoupling structure includes at least three interference structures, and the interference structures are called periodic units due to their periodic arrangement characteristics. The types of some periodic units in the embodiment of the present application are as follows: Figure 3B shown.

[0082] It should be noted that the periodic unit in the decoupling structure includes at least one ring structure, the shape of the ring can be circular, square, regular hexagon or regular octagon, and the periodic unit can also include two types: patch type or slot type according to material classification. The number of patch rings or slot rings in the patch type or slot type can be one or more, and the specific number is not limited here.

[0083] In combination with the above introduction, the structural design principle of the periodic unit in the embodiment of the present application is introduced below:

[0084] According to experimental results, the length period size of the periodic arrangement of the periodic unit in the decoupling structure is related to the incident angle of the absorbed electromagnetic wave. When the size of the ring structure in the periodic unit remains unchanged, the smaller the arrangement size of the periodic unit, the larger the incident angle of the absorbed electromagnetic wave. Figure 3C :

[0085] Figure 3C The decoupling structure shown is composed of a dielectric substrate and four double-ring patch-type periodic units. The size of the ring structure in each periodic unit is the same, where the size of the largest ring structure is a. The arrangement period of the periodic units in the decoupling structure refers to the distance b between the centers of two adjacent periodic units. Under the condition that a remains unchanged, the smaller b is, the larger the angle between the electromagnetic wave that the decoupling structure composed of the periodic unit can absorb and the normal line of the plane of the decoupling structure.

[0086] Since the actual antenna products Figure 2 The angle between the incident angle of the electromagnetic wave affecting the isolation shown in path 2 and the normal line of the decoupling structure is 60°-80°, so the angle between the incident angle of the electromagnetic wave absorbed by the decoupling structure and the plane normal line of the decoupling structure is also set to 60°-80°.

[0087] According to further experimental results, it can be determined that when b is less than 1.3a, that is, the arrangement period of the periodic units in the decoupling structure is less than 1.3 times the size of the largest ring structure in the periodic unit, the decoupling structure can achieve strong absorption of electromagnetic waves with an incident angle of 60° to 80° to the normal of the decoupling structure.

[0088] The decoupling structure may include multiple columns of periodic units. The number of columns of periodic units is related to the frequency range of electromagnetic waves that the decoupling structure can absorb. When the multiple columns of periodic units include at least two columns of periodic units with different sizes, the more columns of periodic units there are, the larger the frequency range of electromagnetic waves that can be absorbed.

[0089] The number of periodic units included in each column of periodic units in the decoupling structure is related to the absorption effect. The more the number of periodic units in each column is, the stronger the absorption effect is.

[0090] The size of the ring structure in the periodic unit is related to the frequency range of electromagnetic waves absorbed by the decoupling structure. When the size of the largest ring structure in the periodic unit is smaller than the operating wavelength of the antenna system and larger than 0.4 times the operating wavelength, the decoupling structure can absorb electromagnetic waves with a wavelength equal to the operating wavelength of the antenna system.

[0091] It should be noted that the lower limit of the size of the largest ring structure in the periodic unit is related to the dielectric constant of the dielectric substrate or the metal base plate, the distance between multiple ring structures and the length period of the periodic arrangement of the periodic unit.

[0092] In the double-ring periodic unit, the distance between the inner ring structure and the outer ring structure will also affect the electromagnetic wave absorption frequency of the decoupling structure formed by the periodic unit. When the edge distance between the inner ring structure and the outer ring structure decreases, the electromagnetic wave absorption frequency will be reduced. The following takes the double-ring patch periodic unit and the double-ring gap periodic unit as examples to introduce the influence of the edge distance between the inner ring structure and the outer ring structure on the electromagnetic wave absorption frequency. Please refer to Figure 3D :

[0093] The size of the outer square ring patch or the outer square ring gap is smaller than the working wavelength of the antenna system and larger than 0.4 times the working wavelength of the antenna system; according to experimental results, it is determined that the edge distance between the inner square ring patch and the outer square ring patch is related to the electromagnetic wave absorption frequency of the decoupling structure. When the edge distance between the inner square ring patch and the outer square ring patch decreases, the absorption frequency of the electromagnetic wave will decrease.

[0094] According to the above electromagnetic principles, the structures of the decoupling structural components and the antenna system in the embodiment of the present application are designed to obtain multiple antenna systems with good isolation improvement effects. The structure of the antenna system in the embodiment of the present application is introduced below:

[0095] In the embodiment of the present application, the position of the decoupling structure in the antenna system is parallel to the line connecting the first antenna and the second antenna, and can be located directly below the first antenna or the second antenna, that is, the decoupling structure intersects with the projection of the first antenna or the second antenna, or can be located in the interval space between the first antenna and the second antenna, that is, the decoupling structure does not intersect with the projection of the first antenna or the second antenna, which are described below respectively:

[0096] 1. The decoupling structure intersects with the projection of the first antenna or the second antenna onto the reflector.

[0097] In this embodiment, the decoupling structure is parallel to the line connecting the first antenna and the second antenna. The decoupling structure is located in a space surrounded by the first antenna, the second antenna and the reflector. The decoupling structure intersects with the projection of the first antenna or the second antenna.

[0098] In this embodiment, the decoupling structure may include a single-row periodic unit or multiple-row periodic units, which are described below respectively:

[0099] 1. The decoupling mechanism includes a single-row periodic unit:

[0100] In this embodiment, the decoupling structure only includes a single row of periodic units, wherein the single row of periodic units includes at least 4 periodic units.

[0101] In this embodiment, the periodic unit in the decoupling structure can have a variety of shapes, which can be square ring or circular, single ring or double ring, and the type of the periodic unit can be gap type or patch type. The following only takes the periodic unit of double ring gap type and double ring patch type as examples for introduction:

[0102] (1) The periodic unit in the decoupling structure is a double-ring patch type:

[0103] See also Figure 4 In this embodiment, the antenna system includes a first antenna, a second antenna, a reflector, and a decoupling structure, wherein the decoupling structure includes four periodic units in a single row, and each periodic unit is a double-ring patch type periodic unit.

[0104] A plurality of interference structural members are arranged periodically in a certain manner to form a periodic structure, wherein each interference structural member is referred to as a periodic unit of the periodic structure. In this embodiment, the antenna system has good isolation and small return loss between the first antenna and the second antenna.

[0105] By simulating the structure in this embodiment, specific dimensions of various structural components of the antenna system in this embodiment and performance indicators of isolation and return loss can be obtained.

[0106] The specific dimensions of the various structural components of the antenna system in this embodiment are shown in Table 1 below:

[0107] Table 1

[0108]

[0109] In this embodiment, the first antenna and the second antenna of the antenna system are both planar dipole antennas, each dipole antenna is a dipole ring array including four units and includes two directors, the distance between the feeding center of the first antenna and the feeding center of the second antenna is 113 mm, and the decoupling structure includes 4 periodic units in a single row, each periodic unit is square, and the type of the periodic unit is a double square ring / patch type, that is, two square ring-shaped metal patches are attached to a dielectric substrate.

[0110] In order to achieve a strong absorption ability for electromagnetic waves in the frequency range of 5.65GHz-6.05GHz, of the two square ring patches in each periodic unit, the side length of the outer square ring patch is 10.2mm, the width of the outer square ring patch is 0.4mm, the width of the inner square ring patch is the same as the width of the outer square ring patch, which is also 0.4mm, and the edge spacing between the outer square ring patch and the inner square ring patch is 0.4mm.

[0111] In order to achieve large-angle absorption of the decoupling structure, the length period of the periodic unit arrangement is less than 1.3 times the side length of the outer square ring. In this embodiment, the arrangement period of the periodic unit is 11.5 mm as an example, that is, the side length of the dielectric substrate in the periodic unit is 11.5 mm, that is, the center distance between the two periodic units is 11.5 mm.

[0112] In addition to the functional structure, the first antenna, the second antenna and the decoupling structure also include a dielectric substrate for bearing. The dielectric substrates of the first antenna, the second antenna and the decoupling structure are the same, made of FR4 and 1 mm thick.

[0113] In the cross section of the antenna system in this embodiment, the cross section height of the reflector is the lowest, the cross section heights of the first antenna and the second antenna are the same, and the cross section height of the decoupling structure is lower than the first antenna or the second antenna and higher than the reflector. The height between the lower surface of the dielectric substrate of the first antenna or the second antenna and the reflector is 14 mm, and the height between the lower surface of the dielectric substrate of the decoupling structure and the reflector is 8 mm.

[0114] It should be noted that the director is used to adjust the roundness of the first antenna or the second antenna in the horizontal direction. In this embodiment, each of the first antenna or the second antenna may include two directors or may not include a director, which is not specifically limited here.

[0115] Based on the antenna system structure shown in Table 1 above, the simulation effect diagram of various performances of the antenna system is obtained. Please refer to Figures 5 and 6 ;

[0116] It should be noted that when simulating the performance of the antenna system, in order to simulate the actual antenna product, a shell dielectric substrate is added to the simulated antenna system model.

[0117] The shell dielectric substrate in the antenna system of this embodiment is located above the first antenna and the second antenna, is the same size as the reflector and is parallel to the line connecting the first antenna and the second antenna. The parameters of the shell dielectric substrate are: the relative dielectric constant of the dielectric substrate is set to 3.2, the loss tangent is 0.003, the thickness of the shell dielectric substrate is 2.5 mm, and the lower surface of the shell dielectric substrate is 2 mm away from the upper surface of the dielectric substrate of the first antenna or the second antenna.

[0118] It should be noted that the antenna system in the embodiment of the present application may include a shell dielectric substrate or may not include a shell dielectric substrate. The parameters of the above shell dielectric substrate are merely examples and are not limited here.

[0119] In this embodiment, the isolation improvement effect of the antenna system, that is, the S21 parameter of the antenna system is as follows: Figure 5 As shown in the "decoupling structure (miniaturization)" in FIG. 1 , the return loss performance index of the antenna system in this embodiment, that is, the S11 parameter of the antenna system is as follows: Figure 6 As shown in "With decoupling structure (miniaturization)".

[0120] When the frequency range supported by the first antenna or the second antenna is 5 GHz-6 GHz, Figure 5 It can be seen from the “decoupling structure (miniaturization)” that the isolation of the antenna system in this embodiment is improved by at least 5dB at 5.65GHz-6.05GHz; Figure 6 From the “decoupling structure (miniaturization)”, it can be seen that the return loss of the antenna system in this embodiment is small, and the impact on the reflection coefficient of the antenna itself is small, and good impedance matching can still be obtained under the premise that the original antenna size remains unchanged.

[0121] (2) The periodic unit in the decoupling structure is a double-ring gap type.

[0122] See also Figure 7In this embodiment, the antenna system includes a first antenna, a second antenna, a reflector, and a decoupling structure, wherein the decoupling structure includes four periodic units in a single row, and each periodic unit is a double-ring gap periodic unit. The double-ring gap periodic unit is to construct two square ring-shaped gaps on a metal panel. The main function of the two square ring-shaped gaps is the same as Figure 4 The two square ring patches in the embodiment shown are identical. Figure 4 The simulation idea and simulation method of the illustrated embodiment can obtain the dimensions of each structural component of the antenna system in this embodiment when achieving an ideal isolation improvement effect and return loss.

[0123] 2. The decoupling structure includes multiple columns of periodic units:

[0124] In this embodiment, the decoupling structure includes multiple columns of periodic units, each column of the multiple columns of periodic units includes at least 4 periodic units, the number of periodic units included in each column of periodic units can be the same or different, and this embodiment is only introduced by taking the example that the number of periodic units included in each column of periodic units is the same.

[0125] The multi-column periodic unit can be an integral decoupling structure or multiple independent parts, such as two independent parts, which are described below:

[0126] (1) The multi-column periodic unit is an integral decoupling structure:

[0127] In this embodiment, the decoupling structure is a whole and may include multiple columns of periodic units. In this embodiment, the decoupling structure includes 4 columns of periodic units, and each column of periodic units includes 4 periodic units. Figure 8 :

[0128] It should be noted that the periodic unit in the embodiment of the present application may also be a double ring / slot type or a double ring / patch type. In this embodiment, only the double ring / patch type periodic unit is used as an example for introduction.

[0129] For example Figure 8 By simulating the structure in the illustrated embodiment, the specific dimensions of the various structural components of the antenna system in this embodiment as well as the performance indicators of isolation and return loss can be obtained.

[0130] The specific dimensions of the various structural components of the antenna system in this embodiment are shown in Table 2 below:

[0131] Table 2

[0132]

[0133] In this embodiment, the first antenna and the second antenna of the antenna system are both planar dipole antennas, each dipole antenna is a dipole ring array including four units and includes two directors, the distance between the feeding center of the first antenna and the feeding center of the second antenna is 55 mm, the decoupling structure includes 4 columns of periodic units, each column of periodic units includes 4 periodic units, and the type of the periodic unit is a double square ring / patch type, that is, two square ring-shaped metal patches are attached to a dielectric substrate.

[0134] In order to achieve a stronger absorption capability for electromagnetic waves in the frequency range of 5.55GHz-6.05GHz, the outer square ring patches in the first and fourth columns have the same side length of 10.2mm, the outer square ring patches in the second and third columns have the same side length of 9.8mm, the width of the outer square ring patches is 0.4mm, the width of the inner square ring patches is the same as that of the outer square ring patches, also 0.4mm, and the edge spacing between the outer square ring patches and the inner square ring patches is 0.4mm.

[0135] In order to achieve large-angle absorption of the decoupling structure, the length period of the periodic unit arrangement is less than 1.3 times the side length of the outer square ring. In this embodiment, the arrangement period of the periodic unit is 11.5 mm as an example, that is, the side length of the dielectric substrate in the periodic unit is 11.5 mm, that is, the center distance between the two periodic units is 11.5 mm.

[0136] In the cross section of the antenna system in this embodiment, the cross section height of the reflector is the lowest, the cross section heights of the first antenna and the second antenna are the same, and the cross section height of the decoupling structure is lower than the first antenna or the second antenna and higher than the reflector. The height between the lower surface of the dielectric substrate of the first antenna or the second antenna and the reflector is 14 mm, and the height between the lower surface of the dielectric substrate of the decoupling structure and the reflector is 8 mm.

[0137] It should be noted that the director is used to adjust the roundness of the first antenna or the second antenna in the horizontal direction. In this embodiment, each of the first antenna or the second antenna may include two directors or may not include a director, which is not specifically limited here.

[0138] Based on the detailed dimensions of each structure in the antenna system in Table 2 above, the simulation effect diagram of each performance of the antenna system is obtained. Please refer to Figures 9 and 10 :

[0139] It should be noted that when simulating the performance of the antenna system, in order to simulate the actual antenna product, a shell dielectric substrate is added to the simulated antenna system model. The shell dielectric substrate in this embodiment is the same as the shell dielectric substrate of the antenna system shown in Table 1 during simulation, and will not be described in detail here.

[0140] In this embodiment, the isolation improvement effect of the antenna system, that is, the S21 parameter of the antenna system is as follows: Fig. 9 As shown in the "Decoupling Structure (Close-Range Antenna)" section, the return loss performance index, i.e. the S11 parameter of the antenna system, is as follows: Fig.10 As shown in "With decoupling structure (close distance antenna)".

[0141] When the frequency range supported by the first antenna or the second antenna is 5 GHz-6 GHz, Fig. 9 It can be seen from the “decoupling structure (close-range antenna)” that the isolation of the antenna system in this embodiment is improved by at least 5dB at 5.55GHz-6.05GHz; Fig.10 From the “with decoupling structure (short-range antenna)”, it can be seen that the return loss of the antenna system in this embodiment is small, and the impact on the reflection coefficient of the antenna itself is small, and good impedance matching can still be obtained under the premise that the original antenna size remains unchanged.

[0142] (2) The multi-column periodic unit is divided into two parts with a certain distance of the decoupling structure.

[0143] In this embodiment, the decoupling structure includes a plurality of identical parts with a certain distance, each part may include a plurality of columns of periodic units. In this embodiment, the decoupling structure includes two identical parts with a certain distance, each part may include two or three columns of periodic units, and each column of periodic units includes four periodic units, which are described below:

[0144] It should be noted that the periodic unit in the embodiment of the present application may also be a double ring / slot type or a double ring / patch type. In this embodiment, only the double ring / patch type periodic unit is used as an example for introduction.

[0145] a. Each part of the decoupling structure consists of 2 columns of periodic units:

[0146] See also Fig.11 In this embodiment, the decoupling structure includes two parts, each part includes two columns of periodic units, and each column of periodic units includes four periodic units.

[0147] For example Fig.11 By simulating the structure in the illustrated embodiment, the specific dimensions of the various structural components of the antenna system in this embodiment as well as the performance indicators of isolation and return loss can be obtained.

[0148] The specific dimensions of the various structural components of the antenna system in this embodiment are shown in Table 3 below:

[0149] Table 3

[0150]

[0151] In this embodiment, the first antenna and the second antenna of the antenna system are both planar dipole antennas, each dipole antenna is a dipole ring array including four units and includes two directors, the distance between the feeding center of the first antenna and the feeding center of the second antenna is 113 mm, and the decoupling structure is divided into two parts, each part includes 2 columns of periodic units, a total of 4 columns, each column of periodic units includes 4 periodic units, and the type of the periodic unit is a double square ring / patch type, that is, two square ring-shaped metal patches are attached to a dielectric substrate.

[0152] In order to achieve a strong absorption ability for electromagnetic waves in the frequency range of 5.635-6.135GHz, the outer square ring patches in the first and fourth columns have the same side length of 10.4mm, the outer square ring patches in the second and third columns have the same side length of 9.8mm, the width of the outer square ring patch is 0.4mm, the width of the inner square ring patch is the same as the width of the outer square ring patch, also 0.4mm, and the edge spacing between the outer square ring patch and the inner square ring patch is 0.4mm.

[0153] In order to achieve large-angle absorption of the decoupling structure, the length period of the periodic unit arrangement is less than 1.3 times the side length of the outer square ring. In this embodiment, the arrangement period of the periodic unit is 11.5 mm as an example, that is, the side length of the dielectric substrate in the periodic unit is 11.5 mm, that is, the center distance between the two periodic units is 11.5 mm.

[0154] In the cross section of the antenna system in this embodiment, the cross section height of the reflector is the lowest, the cross section heights of the first antenna and the second antenna are the same, and the cross section height of the decoupling structure is lower than the first antenna or the second antenna and higher than the reflector. The height between the lower surface of the dielectric substrate of the first antenna or the second antenna and the reflector is 14 mm, and the height between the lower surface of the dielectric substrate of the decoupling structure and the reflector is 8 mm.

[0155] It should be noted that the director is used to adjust the roundness of the first antenna or the second antenna in the horizontal direction. In this embodiment, each of the first antenna or the second antenna may include two directors or may not include a director, which is not specifically limited here.

[0156] Based on the detailed dimensions of each structure in the antenna system in Table 3 above, the simulation effect diagram of each performance of the antenna system is obtained. Please refer to Figures 5 and 6 :

[0157] It should be noted that when simulating the performance of the antenna system, in order to simulate the actual antenna product, a shell dielectric substrate is added to the simulated antenna system model. The shell dielectric substrate in this embodiment is the same as the shell dielectric substrate of the antenna system shown in Table 1 during simulation, and will not be described in detail here.

[0158] In this embodiment, the isolation improvement effect of the antenna system, that is, the S21 parameter of the antenna system is as follows: Figure 5 As shown in the “decoupling structure (overlapping with the antenna)”, the return loss performance index, that is, the S11 parameter of the antenna system is as follows Figure 6 As shown in “With decoupling structure (overlapping with antenna)”.

[0159] When the frequency range supported by the first antenna or the second antenna is 5 GHz-6 GHz, Figure 5 From the “decoupling structure (overlapping with the antenna)”, it can be seen that the isolation between 5.635-6.135GHz is improved by at least 15dB; Figure 6 From the “decoupling structure (overlapping with the antenna)”, it can be seen that the return loss of the antenna system in this embodiment is small, the impact on the reflection coefficient of the antenna itself is small, and good impedance matching can still be obtained under the premise that the original antenna size remains unchanged.

[0160] b. Each part of the decoupling structure includes 3 columns of periodic units:

[0161] See also Fig.12 The decoupling structure includes two parts with a certain distance, each part includes 3 columns of periodic units, and each column of periodic units includes 4 periodic units.

[0162] For example Fig.12 By simulating the structure in the illustrated embodiment, the specific dimensions of the various structural components of the antenna system in this embodiment as well as the performance indicators of isolation and return loss can be obtained.

[0163] The specific dimensions of the various structural components of the antenna system in this embodiment are shown in Table 4 below:

[0164] Table 4

[0165]

[0166] In this embodiment, the first antenna and the second antenna of the antenna system are both planar dipole antennas, each dipole antenna is a dipole ring array including four units and includes two directors, the distance between the feeding center of the first antenna and the feeding center of the second antenna is 113 mm, and the decoupling structure is divided into two parts, each part includes 3 columns of periodic units, a total of 6 columns, each column of periodic units includes 4 periodic units, and the type of the periodic unit is a double square ring / patch type, that is, two square ring-shaped metal patches are attached to a dielectric substrate.

[0167] In order to absorb electromagnetic waves of a specific frequency, the outer square ring patches in the first and sixth columns have the same side length of 10.4 mm, the outer square ring patches in the second and fifth columns have the same side length of 9.8 mm, the outer square ring patches in the third and fourth columns have the same side length of 9 mm, the width of the outer square ring patches is 0.4 mm, the width of the inner square ring patches is the same as that of the outer square ring patches, also 0.4 mm, and the edge spacing between the outer square ring patches and the inner square ring patches is 0.4 mm.

[0168] In order to achieve large-angle absorption of the decoupling structure, the length period of the periodic unit arrangement is less than 1.3 times the side length of the outer square ring. In this embodiment, the arrangement period of the periodic unit is 11.5 mm as an example, that is, the side length of the dielectric substrate in the periodic unit is 11.5 mm, that is, the center distance between the two periodic units is 11.5 mm.

[0169] In the cross section of the antenna system in this embodiment, the cross section height of the reflector is the lowest, the cross section heights of the first antenna and the second antenna are the same, and the cross section height of the decoupling structure is lower than the first antenna or the second antenna and higher than the reflector. The height between the lower surface of the dielectric substrate of the first antenna or the second antenna and the reflector is 14 mm, and the height between the lower surface of the dielectric substrate of the decoupling structure and the reflector is 8 mm.

[0170] It should be noted that the director is used to adjust the roundness of the first antenna or the second antenna in the horizontal direction. In this embodiment, each of the first antenna or the second antenna may include two directors or may not include a director, which is not specifically limited here.

[0171] Based on the detailed dimensions of each structure in the antenna system in Table 4 above, the simulation effect diagram of each performance of the antenna system is obtained. Please refer to Figures 5 and 6 :

[0172] It should be noted that when simulating the performance of the antenna system, in order to simulate the actual antenna product, a shell dielectric substrate is added to the simulated antenna system model. The shell dielectric substrate in this embodiment is the same as the shell dielectric substrate of the antenna system shown in Table 1 during simulation, and will not be described in detail here.

[0173] In this embodiment, the isolation improvement effect of the antenna system, that is, the S21 parameter of the antenna system is as follows: Figure 5 As shown in the "Decoupling Structure (Wideband)" section, the return loss performance index, that is, the S11 parameter of the antenna system is as follows Figure 6 As shown in “With decoupling structure (wideband)”.

[0174] When the frequency range supported by the first antenna or the second antenna is 5 GHz-6 GHz, Figure 5 From the “decoupling structure (wideband)”, it can be seen that the isolation between 5.15-6.65GHz is improved by at least 10dB; Figure 6 From “with decoupling structure (wideband)”, it can be seen that the return loss of the antenna system in this embodiment is small, and the impact on the reflection coefficient of the antenna itself is small, and good impedance matching can still be obtained under the premise that the original antenna size remains unchanged.

[0175] 2. The decoupling structure does not intersect with the projection of the first antenna or the second antenna onto the reflector.

[0176] In this embodiment, the decoupling structure is parallel to the line connecting the first antenna and the second antenna. The decoupling structure is located in the space surrounded by the first antenna, the second antenna and the reflector, and is further located in the space surrounded by the gap between the first antenna and the second antenna and the reflector. The decoupling structure does not intersect with the projection of the first antenna or the second antenna onto the reflector.

[0177] It should be noted that, in this embodiment, the decoupling structure may include a single column of periodic units or multiple columns of periodic units; the number of periodic units in each column may be the same or different; the multiple columns of periodic units in the decoupling structure may be a whole or multiple parts, which is not limited here.

[0178] In this embodiment, an example is taken in which the decoupling structure includes two parts, each part includes two columns of periodic units, and each column of periodic units includes five periodic units.

[0179] In this embodiment, the periodic unit in the decoupling structure can have a variety of shapes, which can be square ring or circular, single ring or double ring, and the type of the periodic unit can be gap type or patch type. The following only takes the periodic unit of double ring gap type and double ring patch type as examples for introduction:

[0180] 1. The periodic unit in the decoupling structure is a double-ring patch type:

[0181] See also Fig.13 In this embodiment, the antenna system includes a first antenna, a second antenna, a reflector, and a decoupling structure, wherein the decoupling structure includes two parts, each part includes two columns of periodic units, and each column of periodic units includes five periodic units. Each periodic unit is a double-ring patch type periodic unit. In this embodiment, the antenna system has good isolation and small return loss between the first antenna and the second antenna.

[0182] By simulating the structure in this embodiment, specific dimensions of various structural components of the antenna system in this embodiment and performance indicators of isolation and return loss can be obtained.

[0183] The specific dimensions of the various structural components of the antenna system in this embodiment are shown in Table 5 below:

[0184] Table 5

[0185]

[0186] In this embodiment, the first antenna and the second antenna of the antenna system are both planar dipole antennas, each dipole antenna is a dipole ring array including four units and includes two directors, the distance between the feeding center of the first antenna and the feeding center of the second antenna is 113 mm, and the decoupling structure includes two parts, each part includes 2 columns of periodic units, each column of periodic units includes 5 periodic units, each periodic unit is square, and the type of the periodic unit is a double square ring / patch type, that is, two square ring-shaped metal patches are attached to a dielectric substrate.

[0187] In order to achieve a strong absorption ability for electromagnetic waves in the frequency range of 5.635-6.135GHz, the outer square ring patches in the first and fourth columns have the same side length of 9.3mm, the outer square ring patches in the second and third columns have the same side length of 8.4mm, the width of the outer square ring patch is 0.4mm, the width of the inner square ring patch is the same as the width of the outer square ring patch, also 0.4mm, and the edge spacing between the outer square ring patch and the inner square ring patch is 0.4mm.

[0188] In order to achieve large-angle absorption of the decoupling structure, the length period of the periodic unit arrangement is less than 1.3 times the side length of the outer square ring. In this embodiment, the arrangement period of the periodic unit is 10 mm as an example, that is, the side length of the dielectric substrate in the periodic unit is 10 mm, that is, the center distance between the two periodic units is 10 mm.

[0189] In the cross section of the antenna system in this embodiment, the cross section height of the reflector is the lowest, the cross section heights of the first antenna and the second antenna are the same, and the cross section height of the decoupling structure is lower than the first antenna or the second antenna and higher than the reflector. The height between the lower surface of the dielectric substrate of the first antenna or the second antenna and the reflector is 14 mm, and the height between the lower surface of the dielectric substrate of the decoupling structure and the reflector is 9 mm.

[0190] It should be noted that the director is used to adjust the roundness of the first antenna or the second antenna in the horizontal direction. In this embodiment, each of the first antenna or the second antenna may include two directors or may not include a director, which is not specifically limited here.

[0191] Based on the detailed dimensions of each structure in the antenna system in Table 5 above, the simulation effect diagram of each performance of the antenna system is obtained. Please refer to Figures 14 to 15B :

[0192] It should be noted that when simulating the performance of the antenna system, in order to simulate the actual antenna product, a shell dielectric substrate is added to the simulated antenna system model. The shell dielectric substrate in this embodiment is the same as the shell dielectric substrate of the antenna system shown in Table 1 during simulation, and will not be described in detail here.

[0193] In this embodiment, the isolation improvement effect of the antenna system, that is, the S21 parameter of the antenna system is as follows: Fig.14 As shown in the "Decoupling Structure (Patch Type)", the return loss performance index, that is, the S11 parameter of the antenna system is as follows Fig.15A As shown in the "decoupling structure (patch type)" in FIG. 1 , the 75° average gain and peak gain of the antenna system in this embodiment are as follows: Fig. 15B shown.

[0194] When the frequency range supported by the first antenna or the second antenna is 5 GHz-6 GHz, Fig.14 From the “with decoupling structure (patch type)”, it can be seen that the isolation between 5.635-6.135GHz is improved by at least 10dB; Fig.15A It can be seen from the “with decoupling structure (patch type)” in the figure that the return loss of the antenna system in this embodiment is small, and the influence on the reflection coefficient of the antenna itself is small, and good impedance matching can still be obtained under the premise that the original antenna size remains unchanged; Fig. 15B It can be seen that the peak gain and 75° average gain of the antenna system in this embodiment have little influence, and have good performance.

[0195] 2. The periodic unit in the decoupling structure is a double ring gap type:

[0196] See also Fig.16 In this embodiment, the antenna system includes a first antenna, a second antenna, a reflector, and a decoupling structure, wherein the decoupling structure includes two parts, each part includes two columns of periodic units, and each column of periodic units includes five periodic units. Each periodic unit is a double-ring slot-type periodic unit. In this embodiment, the antenna system has good isolation and small return loss between the first antenna and the second antenna.

[0197] By simulating the structure in this embodiment, specific dimensions of various structural components of the antenna system in this embodiment and performance indicators of isolation and return loss can be obtained.

[0198] The specific dimensions of the various structural components of the antenna system in this embodiment are shown in Table 6 below:

[0199] Table 6

[0200]

[0201] In this embodiment, the first antenna and the second antenna of the antenna system are both planar dipole antennas, each dipole antenna is a dipole ring array including four units and includes two directors, the distance between the feeding center of the first antenna and the feeding center of the second antenna is 113 mm, and the decoupling structure includes two parts, each part includes 2 columns of periodic units, each column of periodic units includes 5 periodic units, each periodic unit is square, and the type of the periodic unit is a double square ring / slot type, that is, two square ring-shaped metal slots are constructed on a metal panel.

[0202] In order to achieve a strong absorption ability for electromagnetic waves in the frequency range of 5.635-6.135GHz, the outer square ring patches in the first and fourth columns have the same side length of 9.3mm, the outer square ring patches in the second and third columns have the same side length of 8.7mm, the width of the outer square ring patch is 0.4mm, the width of the inner square ring patch is the same as the width of the outer square ring patch, also 0.4mm, and the edge spacing between the outer square ring patch and the inner square ring patch is 0.4mm.

[0203] In order to achieve large-angle absorption of the decoupling structure, the length period of the periodic unit arrangement is less than 1.3 times the side length of the outer square ring. In this embodiment, the arrangement period of the periodic unit is 10 mm as an example, that is, the side length of the dielectric substrate in the periodic unit is 10 mm, that is, the center distance between the two periodic units is 10 mm.

[0204] In the cross section of the antenna system in this embodiment, the cross section height of the reflector is the lowest, the cross section heights of the first antenna and the second antenna are the same, and the cross section height of the decoupling structure is lower than the first antenna or the second antenna and higher than the reflector. The height between the lower surface of the dielectric substrate of the first antenna or the second antenna and the reflector is 14 mm, and the height between the lower surface of the dielectric substrate of the decoupling structure and the reflector is 9 mm.

[0205] It should be noted that the director is used to adjust the roundness of the first antenna or the second antenna in the horizontal direction. In this embodiment, each of the first antenna or the second antenna may include two directors or may not include a director, which is not specifically limited here.

[0206] Based on the detailed dimensions of each structure in the antenna system in Table 6 above, the simulation effect diagram of each performance of the antenna system is obtained. Please refer to Figures 17 to 18B :

[0207] It should be noted that when simulating the performance of the antenna system, in order to simulate the actual antenna product, a shell dielectric substrate is added to the simulated antenna system model. The shell dielectric substrate in this embodiment is the same as the shell dielectric substrate of the antenna system shown in Table 1 during simulation, and will not be described in detail here.

[0208] In this embodiment, the isolation improvement effect of the antenna system, that is, the S21 parameter of the antenna system is as follows: Fig.17 As shown in the "decoupling structure (slot type)", the return loss performance index, that is, the S11 parameter of the antenna system is as follows Fig.18A As shown in the "decoupling structure (slot type)", the 75° average gain and peak gain of the antenna system in this embodiment are as follows Fig.18B shown.

[0209] When the frequency range supported by the first antenna or the second antenna is 5 GHz-6 GHz, Fig.17 From the “with decoupling structure (patch type)”, it can be seen that the isolation between 5.635-6.135GHz is improved by at least 10dB; Fig.18A It can be seen from the “with decoupling structure (patch type)” in the figure that the return loss of the antenna system in this embodiment is small, and the influence on the reflection coefficient of the antenna itself is small, and good impedance matching can still be obtained under the premise that the original antenna size remains unchanged; Fig.18B It can be seen that the peak gain and 75° average gain of the antenna system in this embodiment have little influence, and have good performance.

Claims

1. An antenna system, characterized in that: include: A first antenna, a second antenna, a decoupling structure and a reflector; The decoupling structure includes at least three interference structures, the at least three interference structures are located in the same plane, the at least three interference structures have the same structure, the interference structure includes at least one ring structure, and the decoupling structure has an absorption effect on the electromagnetic wave emitted from the first antenna and reflected by the reflector to reach the second antenna, and the electromagnetic wave emitted from the second antenna and reflected by the reflector to reach the first antenna; The at least three interference structural members are periodically arranged on the plane, and the length period of the periodic arrangement is less than 1.3 times the size of the interference structural member; The plane is parallel to a line connecting the first antenna and the second antenna, and the decoupling structure is located in a space surrounded by the first antenna, the second antenna and the reflector.

2. The antenna system according to claim 1, characterized in that The decoupling structure includes at least four interference structures.

3. The antenna system according to claim 1 or 2, characterized in that: The circumference of the largest ring structure in the at least one ring structure is less than the working wavelength of the antenna system and greater than 0.4 times the working wavelength, where the working wavelength is the wavelength of the electromagnetic wave in free space corresponding to the working frequency band of the antenna system.

4. The antenna system according to any one of claims 1 to 3, characterized in that: The interference structural component is a double-ring gap type structural component or a double-ring patch type structural component.

5. The antenna system according to any one of claims 1 to 4, characterized in that: The at least three interference structures are in a first column of interference structures, and the decoupling structure also includes a second column of interference structures. The interference structures in the second column of interference structures have the same structure, and the size of the interference structures in the first column of interference structures is different from the size of the interference structures in the second column of interference structures.

6. The antenna system according to any one of claims 1 to 5, characterized in that: The decoupling structure includes an intersecting interference structure, and an orthographic projection of the intersecting interference structure on the reflection plate intersects with an orthographic projection of the first antenna or the second antenna on the reflection plate.

7. The antenna system according to any one of claims 1 to 6, characterized in that: The decoupling structure includes a separation interference structure, and an orthographic projection of the separation interference structure on the reflection plate is separated from an orthographic projection of the first antenna or the second antenna on the reflection plate.

8. The antenna system according to any one of claims 1 to 7, characterized in that: The distance between the plane and the reflector is greater than or equal to 0.1 times the working wavelength of the antenna system, the distance is less than the height between the first antenna or the second antenna and the reflector, and the difference between the height and the distance is less than or equal to 0.25 times the working wavelength, where the working wavelength is the wavelength of the electromagnetic wave in free space corresponding to the working frequency band of the antenna system.

9. A wireless device, characterized in that: A radio frequency chip and an antenna system as claimed in any one of claims 1 to 8; The radio frequency chip is used to send and receive radio frequency signals using the antenna system.

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