MIMO patch antenna with self-decoupling function

Abstract

The application belongs to the technical field of antennas, and provides a MIMO patch antenna with a self-decoupling function. The MIMO patch antenna comprises a dielectric substrate, a ground layer and a plurality of metal patches. The dielectric substrate comprises a first surface and a second surface opposite along a height direction. The ground layer is located on the second surface. The plurality of metal patches are arranged at intervals along a length direction on the first surface. A top corner metal via is arranged at a top corner of each metal patch. The metal patch comprises side edges arranged oppositely along the length direction and extending along a width direction. A slot line is arranged in a middle region of the side edge. The MIMO patch antenna with the self-decoupling function provided by the application can achieve low mutual coupling performance while having a small volume.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, and in particular to a MIMO patch antenna with self-decoupling function. BACKGROUND

[0002] With the increasing requirements for transmission rate and transmission capacity in communication process, MIMO patch antennas are widely used.

[0003] The MIMO patch antenna includes a dielectric substrate, a ground layer and a plurality of metal patches. Each metal patch can serve as an antenna unit. The antenna units are coupled to each other, resulting in a large electromagnetic interference between the antenna units, thereby affecting the working performance of the MIMO patch antenna. In the related art, a decoupling structure can be arranged in the MIMO patch antenna to reduce the electromagnetic interference between the antenna units. For example, a decoupling structure can be arranged above the metal patch; or a dielectric layer is added below the ground layer, and a decoupling network is added in the dielectric layer; or a slot is opened in the ground layer; or a decoupling structure is added between adjacent antenna units, so as to reduce the electromagnetic interference between the antenna units through the decoupling structure.

[0004] In the related art, when the decoupling structure is arranged in the MIMO patch antenna to improve the anti-interference capability, the volume of the MIMO patch antenna is often increased. SUMMARY

[0005] The present application provides a MIMO patch antenna with self-decoupling function, which can achieve low mutual coupling performance while having a small volume.

[0006] The present application provides a MIMO patch antenna with self-decoupling function, which includes a dielectric substrate, a ground layer and a plurality of metal patches. The dielectric substrate includes a first surface and a second surface opposite in the height direction. The ground layer is located on the second surface. The plurality of metal patches are arranged in the length direction on the first surface. A top corner metal via is arranged at the top corner of each metal patch. The metal patch includes side edges arranged opposite in the length direction and extending in the width direction. A slot line is arranged in the middle region of the side edge.

[0007] In a possible implementation, the MIMO patch antenna with self-decoupling function provided by the present application is characterized in that the top corner metal vias on the two adjacent metal patches are aligned in the length direction.

[0008] In a possible implementation, the MIMO patch antenna with self-decoupling function provided by the present application is characterized in that the top corner metal via at each top corner is a plurality of top corner metal vias, and the plurality of top corner metal vias are arranged in the width direction.

[0009] In a possible implementation, the MIMO patch antenna with self-decoupling function provided in the application has the same aperture of each top corner metal via.

[0010] In a possible implementation, the MIMO patch antenna with self-decoupling function provided in the application has the length direction alignment of the slot lines on the two adjacent metal patches.

[0011] In a possible implementation, the MIMO patch antenna with self-decoupling function provided in the application has two slot lines arranged on each side edge.

[0012] In a possible implementation, the MIMO patch antenna with self-decoupling function provided in the application has each slot line including a first extension arm and a second extension arm connected with the first extension arm, the two first extension arms are arranged in parallel in the length direction, and the two second extension arms extend away from each other in the width direction.

[0013] In a possible implementation, the MIMO patch antenna with self-decoupling function provided in the application has an intermediate metal via further arranged on the metal patch.

[0014] In a possible implementation, the MIMO patch antenna with self-decoupling function provided in the application has the intermediate metal via arranged between the two slot lines on the same side edge.

[0015] In a possible implementation, the MIMO patch antenna with self-decoupling function provided in the application further includes a feeding terminal, and the feeding terminal is electrically connected with the metal patch.

[0016] The MIMO patch antenna with self-decoupling function provided in the application has the following advantages. The MIMO patch antenna with self-decoupling function provided in the application has the same aperture of each top corner metal via, which can reduce the electrical coupling between the adjacent metal patches and will not increase the size of the MIMO patch antenna. The MIMO patch antenna with self-decoupling function provided in the application has the length direction alignment of the slot lines on the two adjacent metal patches, which can reduce the magnetic coupling between the adjacent metal patches and will not increase the size of the MIMO patch antenna. The MIMO patch antenna with self-decoupling function provided in the application has two slot lines arranged on each side edge, which can reduce the magnetic coupling between the adjacent metal patches and will not increase the size of the MIMO patch antenna. The MIMO patch antenna with self-decoupling function provided in the application has each slot line including a first extension arm and a second extension arm connected with the first extension arm, the two first extension arms are arranged in parallel in the length direction, and the two second extension arms extend away from each other in the width direction, which can reduce the magnetic coupling between the adjacent metal patches and will not increase the size of the MIMO patch antenna. The MIMO patch antenna with self-decoupling function provided in the application has an intermediate metal via further arranged on the metal patch, which can reduce the electrical coupling between the adjacent metal patches and will not increase the size of the MIMO patch antenna. The MIMO patch antenna with self-decoupling function provided in the application has the intermediate metal via arranged between the two slot lines on the same side edge, which can reduce the magnetic coupling between the adjacent metal patches and will not increase the size of the MIMO patch antenna. The MIMO patch antenna with self-decoupling function provided in the application further includes a feeding terminal, and the feeding terminal is electrically connected with the metal patch, which can reduce the electrical coupling between the adjacent metal patches and will not increase the size of the MIMO patch antenna. Thus, by arranging the top corner metal via and the slot line, the electrical coupling and the magnetic coupling between the first metal patch and the second metal patch can be reduced without increasing the size of the MIMO patch antenna, so that the MIMO patch antenna can achieve the low mutual coupling performance while having a small size. BRIEF DESCRIPTION OF DRAWINGS

[0017] 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.

[0018] Figure 1 A schematic diagram of the structure of a MIMO patch antenna with self-decoupling function provided in an embodiment of this application;

[0019] Figure 2 A side view of a MIMO patch antenna with self-decoupling function provided in an embodiment of this application;

[0020] Figure 3 A top view of a MIMO patch antenna with self-decoupling function provided in an embodiment of this application;

[0021] Figure 4 A graph showing the S-parameters of a MIMO patch antenna with self-decoupling function as a function of frequency, provided in an embodiment of this application.

[0022] Figure 5 The radiation pattern of the MIMO patch antenna with self-decoupling function provided in the embodiments of this application within the passband.

[0023] Explanation of reference numerals in the attached figures:

[0024] 100-MIMO patch antenna;

[0025] 110 - Dielectric substrate; 110a - First surface; 110b - Second surface;

[0026] 120 - Grounding layer;

[0027] 130 - Metal patch; 130a - First metal patch; 130b - Second metal patch;

[0028] 131 - Side; 131a - First side; 131b - Second side;

[0029] 132 - Groove line; 132a - First groove line; 132b - Second groove line; 1321 - First extension arm; 1322 - Second extension arm;

[0030] 133 - Vertex; 133a - First vertex; 133b - Second vertex; 133c - Third vertex; 133d - Fourth vertex;

[0031] 140 - top corner metal via; 140a - first top corner metal via; 140b - second top corner metal via; 140c - third top corner metal via; 140d - fourth top corner metal via;

[0032] 150 - middle metal via; 150a - first middle metal via; 150b - second middle metal via;

[0033] 160 - feed terminal; 160a - first feed terminal; 160b - second feed terminal;

[0034] X - length direction;

[0035] Y - width direction;

[0036] Z - height direction. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0038] In the description of the present application, it should be noted that unless specifically defined and limited, the terms “mounting”, “connection”, “connecting” should be understood in a broad sense, for example, it can be fixedly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the description of the present application, it should be understood that the terms “upper”, “lower”, “front”, “back”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0040] The terms “first”, “second”, “third” (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0041] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such as a process, method, system, product, or maintenance tool that includes a series of steps or units, not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or maintenance tool.

[0042] With the increasing demands for transmission rate and capacity in communication processes, MIMO patch antennas have been widely used. MIMO (Multiple-input Multiple-output) refers to the use of multiple transmit and receive antennas at both the transmitting and receiving ends, enabling signals to be transmitted and received through multiple antennas at both ends, thereby improving transmission rate and capacity.

[0043] A MIMO patch antenna comprises a dielectric substrate, a ground layer, and multiple metal patches, each of which can function as an antenna element. The antenna elements are coupled to each other, resulting in significant electromagnetic interference (EMI) and thus affecting the antenna's performance. Related technologies utilize decoupling structures within the MIMO patch antenna to reduce EMI between antenna elements.

[0044] For example, multiple antenna decoupling surfaces (ADSs) composed of metal reflective patches can be placed above the metal patch. The distance between the ADSs and the patch antenna should be greater than 0.25λ0 (where λ0 is the wavelength corresponding to the center frequency of the antenna's operation). This creates a new path for reflected signals to cancel signal coupling between adjacent antenna elements, thereby improving isolation between antenna elements. Alternatively, multiple open-loop resonators can be placed above the metal patch to form a near-field resonator. The distance between the near-field resonator and the patch antenna also needs to be greater than 0.25λ0. Therefore, the near-field resonator also increases the height of the MIMO patch antenna.

[0045] Alternatively, a dielectric layer can be added below the ground plane, and a decoupling network can be added within this dielectric layer. The decoupling network can deploy the compensated transmission lines on the feed lines of each pair of metal patches, achieving a purely imaginary transmission admittance. This transmission admittance is then canceled out by the parallel reaction between the two introduced transmission lines, ultimately enhancing isolation. Increasing the dielectric layer also increases the height of the MIMO patch antenna. However, the design of the decoupling network is relatively complex.

[0046] A defected ground structure (DGS) can also be introduced by slotting the ground plane, which reduces the interference between the antenna elements. However, slotting the ground plane increases the size of the ground plane. In addition, slotting the ground plane also causes back radiation.

[0047] An electromagnetic band gap (EBG) can also be provided between adjacent antenna elements, but the EBG increases the spacing between adjacent antenna elements, thereby increasing the length or width of the MIMO patch antenna.

[0048] In related technologies, when a decoupling structure is provided in a MIMO patch antenna to improve the mutual coupling suppression capability, the volume of the MIMO patch antenna is increased.

[0049] Therefore, the present application provides a MIMO patch antenna with a self-decoupling function, which can achieve low mutual coupling performance while having a small volume.

[0050] Figure 1 A structure diagram of the MIMO patch antenna with a self-decoupling function provided by the embodiments of the present application is provided; Figure 2 A side view of the MIMO patch antenna with a self-decoupling function provided by the embodiments of the present application is provided; Figure 3 A top view of the MIMO patch antenna with a self-decoupling function provided by the embodiments of the present application is provided.

[0051] Referring to Figures 1 to 3 As shown in the drawings, the MIMO patch antenna 100 provided by the present application includes a dielectric substrate 110, a ground plane 120, and a plurality of metal patches 130. The dielectric substrate 110 includes a first surface 110a and a second surface 110b opposite along the height direction Z. The ground plane 120 is located on the second surface 110b. The plurality of metal patches 130 are arranged at intervals along the length direction X on the first surface 110a. Each metal patch 130 is provided with a top corner metal via 140 at the top corner. The metal patch 130 includes side edges 131 arranged opposite along the length direction X and extending along the width direction Y. The side edges 131 are provided with slot lines 132 in the middle region.

[0052] The dielectric substrate 110 is a carrier plate of the MIMO patch antenna, and the thickness of the dielectric substrate 110 is much smaller than λ0. The two surfaces of the dielectric substrate 110 opposite along the height direction Z are the first surface 110a and the second surface 110b, respectively. The ground plane 120 is arranged on one side of the second surface 110b, and the ground plane 120 is also a metal layer.

[0053] The first surface 110a is provided with a plurality of metal patches 130, and each metal patch 130 is an antenna element. InFigures 1 to 3 The illustrated embodiment schematically shows two metal patches 130, both of which are rectangular, forming two antenna elements. These two metal patches 130 are designated as a first metal patch 130a and a second metal patch 130b.

[0054] The first metal patch 130a and the second metal patch 130b have the same structure. The structure of the metal patch 130 will be described below using the first metal patch 130a as an example. The first metal patch 130a includes four apex corners 133, namely the first apex corner 133a, the second apex corner 133b, the third apex corner 133c, and the fourth apex corner 133d. Each apex corner is provided with a apex metal via 140. The apex metal via 140 extends along the height direction Z. One end of the apex metal via 140 is connected to the metal patch 130, and the other end is connected to the ground layer 120.

[0055] The corner metal vias 140 are respectively the first corner metal via 140a, the second corner metal via 140b, the third corner metal via 140c, and the fourth corner metal via 140d.

[0056] The third apex metal via 140c of the first metal patch 130a is adjacent to the first apex metal via 140a of the second metal patch 130b; the fourth apex metal via 140d of the first metal patch 130a is adjacent to the second apex metal via 140b of the second metal patch.

[0057] When the power supply excites the TM of the first metal patch 130a 01 During molding, mutual coupling is formed with the second metal patch 130b. Electrical coupling occurs between the third apex 133c of the first metal patch 130a and the first apex 133a of the second metal patch 130b (electrical coupling is dominant at apex 133). Grounding current exists on both the third apex metal via 140c on the first metal patch 130a and the first apex metal via 140a on the second metal patch 130b, thus generating magnetic coupling between the metal vias 140c and 140a. At the fourth apex 133d of the first metal patch 130a... Electrical coupling occurs between the second apex 133b of the first metal patch and the second metal patch. Grounding current will exist on the fourth apex metal via 140d on the first metal patch 130a and the second apex metal via 140b on the second metal patch 130b, thereby generating magnetic coupling between the metal vias 140d and 140b. Due to the antiphase characteristic between the electrical coupling signal and the magnetic coupling signal, this antiphase characteristic will cause the electrical coupling signal and the magnetic coupling signal to cancel each other out, thereby reducing the electrical coupling between the first metal patch 130a and the second metal patch 130b.

[0058] The projections of the corner metal vias 140 onto the dielectric substrate 110 are all within the range of the projections of the metal patches 130 onto the dielectric substrate 110. Therefore, providing the corner metal vias 140 does not increase the size of the MIMO patch antenna 100 along the length direction X and the width direction Y. The size of the corner metal vias 140 along the height direction Z is equal to the spacing between the metal patches 130 and the ground layer 120. Therefore, providing the corner metal vias 140 does not increase the size of the MIMO patch antenna 100 along the height direction Z. Thus, by providing the corner metal vias 140, the electrical coupling between the first metal patch 130a and the second metal patch 130b can be reduced without increasing the size of the MIMO patch antenna 100.

[0059] The metal patch 130 has two sides 131 that are disposed opposite each other along the length direction X and extend along the width direction Y. These two sides 131 are a first side 131a and a second side 131b, respectively. The second side 131b of the first metal patch 130a is adjacent to the first side 131a of the second metal patch 130b.

[0060] A groove line 132 is provided in the middle area of ​​the first side 131a and the second side 131b along the width direction Y. The groove line 132 extending from the first side 131a toward the interior of the metal patch 130 is the first groove line 132a, and the groove line 132 extending from the second side 131b toward the interior of the metal patch 130 is the second groove line 132b.

[0061] When the power supply excites the TM of the first metal patch 130a 01 When the first metal patch 130a and the second metal patch 130b are mutually coupled, magnetic coupling occurs in the middle region between the second side 131b of the first metal patch 130a and the first side 131a of the second metal patch 130b (magnetic coupling is dominant in the middle region). The second slot line 132b on the first metal patch 130a and the first slot line 132a on the second metal patch 130b can cancel the magnetic coupling in the middle region, thereby reducing the coupling current between the first metal patch 130a and the second metal patch 130b. Since the slot line 132 extends from the side 131 of the metal patch 130a into the interior of the metal patch 130a, setting the slot line 132 does not increase the size of the MIMO patch antenna. Therefore, by setting the slot line 132, the magnetic coupling between the first metal patch 130a and the second metal patch 130b can be reduced without increasing the size of the MIMO patch antenna 100.

[0062] The MIMO patch antenna 100 provided by the embodiment of the present application is configured by a dielectric substrate 110, a ground layer 120 and a plurality of metal patches 130. The dielectric substrate 110 comprises a first surface 110a and a second surface 110b opposite along a height direction Z. The ground layer 120 is located on the second surface 110b. The plurality of metal patches 130 are arranged on the first surface 110a along a length direction X. A top corner metal via 140 is arranged at a top corner of each metal patch 130. The top corner metal via 140 can reduce the electric coupling between adjacent metal patches 130, and the top corner metal via 140 does not increase the size of the MIMO patch antenna 100. The metal patch 130 comprises a side edge 131 arranged opposite along the length direction X and extending along a width direction Y. A slot line 132 is arranged at a middle region of the side edge 131. The slot line 132 can reduce the magnetic coupling between adjacent metal patches 130, and the slot line 132 does not increase the size of the MIMO patch antenna. Thus, by arranging the top corner metal via 140 and the slot line 132, the electric coupling and the magnetic coupling between the first metal patch 130a and the second metal patch 130b can be reduced without increasing the size of the MIMO patch antenna 100, so that the MIMO patch antenna 100 can have a small volume while achieving a low mutual coupling performance.

[0063] Next, the structure of the top corner metal via 140 is described.

[0064] Please continue to refer to Figure 3 As shown in the figure, the top corner metal vias 140 on the two adjacent metal patches 130 are aligned along the length direction X.

[0065] The third top corner metal via 140c on the first metal patch 130a is aligned with the first top corner metal via 140a on the second metal patch 130b along the length direction X. The fourth top corner metal via 140d on the first metal patch 130a is aligned with the second top corner metal via 140b on the second metal patch 130b along the length direction X. Thus, the electric coupling between the first metal patch 130a and the second metal patch 130b can be reduced more effectively.

[0066] Please continue to refer to Figure 1 and Figure 3 As shown in the figure, the top corner metal vias 140 at each top corner 133 are a plurality of, and the plurality of top corner metal vias 140 are arranged along the width direction Y.

[0067] The top corner metal via 140 at each top corner 133 can be two or more than two, in Figure 1 and Figure 3In the embodiment shown, each top corner 133 is shown with two top corner metal vias 140. The plurality of top corner metal vias 140 can adjust the magnetic coupling strength between the first metal patch 130a and the second metal patch 130b, and thus can more effectively reduce the electric coupling between the first metal patch 130a and the second metal patch 130b.

[0068] Since the side edges 131 of the two adjacent metal patches 130 are adjacent, the coupling interference at the side edges 131 is greater, and the side edges 131 extend along the width direction Y, therefore, the plurality of top corner metal vias 140 can be arranged along the width direction Y.

[0069] In a possible implementation, the hole diameters of the plurality of top corner metal vias 140 are the same.

[0070] The same hole diameters of the plurality of top corner metal vias 140 can facilitate the processing of the MIMO patch antenna 100, and make the layout on the metal patch 130 more orderly. In addition, by changing the hole diameters of the top corner metal vias 140, the operating frequency of the MIMO patch antenna 100 can also be changed.

[0071] Next, the specific structure of the slot line 132 will be described.

[0072] Please continue to refer to Figure 1 and Figure 3 As shown, the slot lines 132 on the two adjacent metal patches 130 are aligned along the length direction X.

[0073] The second slot line 132b on the first metal patch 130a is aligned with the first slot line 132a on the second metal patch 130b along the length direction X, and thus the magnetic coupling between the first metal patch 130a and the second metal patch 130b can be more effectively reduced.

[0074] Please continue to refer to Figure 1 and Figure 3 As shown, two slot lines 132 are arranged at each side edge 131.

[0075] When the number of slot lines 132 is set to be larger, the effective area of the metal patch 130 will be reduced, and when the number of slot lines 132 is set to be smaller, the effect of reducing the magnetic coupling between the first metal patch 130a and the second metal patch 130b is limited. Therefore, in the embodiment of the present application, two slot lines 132 can be arranged.

[0076] In a possible implementation, each slot line 132 includes a first extension arm 1321 and a second extension arm 1322 connected to the first extension arm 1321, the two first extension arms 1321 are arranged in parallel along the length direction X, and the two second extension arms 1322 extend away from each other along the width direction Y.

[0077] The structures of the first slot line 132a, the second slot line 132b on the first metal patch 130a and the first slot line 132a, the second slot line 132b on the second metal patch 130b are the same, and the structure of the first slot line 132a on the first metal patch 130a is taken as an example for description.

[0078] Please continue to see Figure 3 As shown, the first slot line 132a includes a first extension arm 1321 and a second extension arm 1322, and the first extension arm 1321 and the second extension arm 1322 form an “L-shaped” structure. The first extension arms 1321 of the two first slot lines 132a extend from the first side edge 131a along the length direction X towards the inside of the first metal patch 130a, and the two second extension arms 1322 extend away from each other along the width direction Y, so that the two first extension arms 1321 can be closer to each other, thereby saving space on the first metal patch 130a.

[0079] Please continue to see Figure 1 And Figure 3 As shown, the metal patch 130 is also provided with an intermediate metal via 150.

[0080] The intermediate metal via 150 extends along the height direction Z, one end of the intermediate metal via 150 is connected with the metal patch 130, and the other end of the intermediate metal via 150 is connected with the ground layer 120.

[0081] The intermediate metal via 150 located at the first side edge 131a is a first intermediate metal via 150a, and the intermediate metal via 150 located at the second side edge 131b is a second intermediate metal via 150b. The second intermediate metal via 150b on the first metal patch 130a is adjacent to the first intermediate metal via 150a on the second metal patch 130b.

[0082] By introducing the intermediate metal via 150 in the middle of the first side edge 131a of the first metal patch 130a, the cross-polarization ratio of the antenna is reduced, and finally the isolation between the antenna ports is improved and the radiation performance of the MIMO patch antenna 100 is improved.

[0083] It should be noted that the aperture of the intermediate metal via 150 and the top corner metal via 140 can be the same or different.

[0084] Since the projections of the intermediate metal via holes 150 on the dielectric substrate 110 are all located within the projection of the metal patch 130 on the dielectric substrate 110, the intermediate metal via holes 150 do not increase the size of the MIMO patch antenna 100 in the length direction X and the width direction Y. The size of the intermediate metal via holes 150 in the height direction Z is equal to the spacing between the metal patch 130 and the ground layer 120, so the intermediate metal via holes 150 do not increase the size of the MIMO patch antenna 100 in the height direction Z.

[0085] Please continue to refer to Figure 1 and Figure 3 As shown in FIG. 6, in a possible implementation, the intermediate metal via holes 150 are arranged between two slot lines 132 located at the same side edge 131.

[0086] The first intermediate metal via hole 150a is located between the two first extension arms 1321, so that the space between the two first extension arms 1321 can be fully utilized, and the structure of the MIMO patch antenna 100 is more compact.

[0087] Please continue to refer to Figures 1 to 3 As shown in FIG. 6, the MIMO patch antenna 100 further includes a feeding terminal 160, and the feeding terminal 160 is electrically connected with the metal patch 130.

[0088] The feeding terminal 160 includes a first feeding terminal 160a and a second feeding terminal 160b, the first feeding terminal 160a is used to feed the first metal patch 130a, and the second feeding terminal 160b is used to feed the second metal patch 130b.

[0089] Taking the first feeding terminal 160a as an example, the ground layer 120 and the dielectric substrate 110 have aligned through holes, and the first feeding terminal 160a is sequentially passed through the through hole on the ground layer 120 and the through hole on the dielectric substrate 110 from the side of the ground layer 120 to be electrically connected with the first metal patch 130a, so as to supply power to the first metal patch 130a.

[0090] Figure 4 The S parameter curve of the MIMO patch antenna with self-decoupling function provided by the embodiment of the present application varies with frequency.

[0091] Please refer to Figure 4 As shown in FIG. 7, the operating frequency of the MIMO patch antenna 100 is in the range of 4.8 GHz to 4.9 GHz, and the isolation between the first metal patch 130a and the second metal patch 130b is increased from 9.5 dB to 17.4 dB.

[0092] Figure 5 The radiation pattern of the MIMO patch antenna with self-decoupling function provided by the embodiment of the present application in the passband.

[0093] Referring to Figure 5 As shown, by setting the top corner metal via 140, the slot line 132 and the middle metal via 150, the main polarization pattern of the yoz plane of the MIMO patch antenna 100 is returned, the gain of the radiation directly above is increased by 2dB, the xoz plane pattern beam is more concentrated, and the top corner metal via 140, the slot line 132 and the middle metal via 150 have little effect on the cross polarization of the MIMO patch antenna 100.

[0094] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A MIMO patch antenna with self-decoupling function, characterized in that, include: The device comprises a dielectric substrate, a ground layer, and a plurality of metal patches. The dielectric substrate includes a first surface and a second surface opposite to each other along the height direction. The ground layer is located on the second surface. The plurality of metal patches are spaced apart along the length direction on the first surface. Each metal patch has a corner metal via at its apex, one end of which is connected to the metal patch, and the other end of which is connected to the ground layer. Each metal patch includes sides opposite to each other along the length direction and extending along the width direction. A groove is provided in the middle region of each side. Two grooves are provided on each side, and each groove includes a first extension arm and a second extension arm connected to the first extension arm. The two first extension arms are arranged parallel to each other along the length direction, and the two second extension arms extend away from each other along the width direction.

2. The MIMO patch antenna with self-decoupling function according to claim 1, characterized in that, The apex metal vias on two adjacent metal patches are aligned along the length direction.

3. The MIMO patch antenna with self-decoupling function according to claim 2, characterized in that, There are multiple corner metal vias at each corner, and the multiple corner metal vias are arranged along the width direction.

4. The MIMO patch antenna with self-decoupling function according to claim 3, characterized in that, Each of the aforementioned corner metal vias has the same diameter.

5. The MIMO patch antenna with self-decoupling function according to any one of claims 1 to 4, characterized in that, The grooves on two adjacent metal patches are aligned along the length direction.

6. The MIMO patch antenna with self-decoupling function according to claim 5, characterized in that, The metal patch is also provided with a central metal via.

7. The MIMO patch antenna with self-decoupling function according to claim 6, characterized in that, The intermediate metal via is disposed between the two grooves located on the same side.

8. The MIMO patch antenna with self-decoupling function according to any one of claims 1 to 4, characterized in that, The MIMO patch antenna with self-decoupling function also includes a feed terminal, which is electrically connected to the metal patch.

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