CN218770092U - Dual-polarization MIMO antenna array - Google Patents
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Abstract
The utility model is suitable for an antenna technical field provides a dual polarization MIMO antenna array, including four antenna element, four said antenna element are two pairs of mirror image mode settings; the antenna unit at least comprises a dielectric substrate, an antenna patch, a feed microstrip line and a feed gap; the number of the dielectric substrates is two or more, and the two or more dielectric substrates are sequentially stacked; the utility model adopts four antenna units, which realizes multiple input and multiple output, and the arrangement of two symmetrical antenna units keeps enough space between the antenna units, thereby having high isolation; wherein antenna paster, the feed microstrip line that the interlayer set up, the feed gap of cooperation setting on the ground plate, the utility model discloses a plurality of antenna element can improve radiant efficiency, and is adjacent distance through control antenna between the antenna element has increased the isolation of antenna.
Description
Technical Field
The utility model belongs to the technical field of the antenna, especially, relate to a dual polarization MIMO antenna array.
Background
With the strong demand of people for higher and higher wireless communication rate and more wireless mobile communication users, the available frequency resources of the mobile communication system are very limited, which leads to a new technology, i.e. MIMO (multiple input multiple output) technology, which can more effectively utilize the spectrum resources in the wireless communication field and improve the communication rate. The MIMO technology divides a data stream to be transmitted into a plurality of sub-data streams for parallel transmission, a plurality of receiving subsystems of a receiving end respectively receive the plurality of sub-data streams and then integrate the plurality of sub-data streams into an original data stream, and the wireless communication rate is greatly improved. In addition, the data stream to be transmitted is divided into a plurality of sub-data streams for independent parallel transmission, a plurality of independent samples are provided for a receiver, the signal to noise ratio is improved, and the wireless communication distance can be increased while the wireless communication speed is improved.
Due to the complexity of the natural environment, the electromagnetic wave can generate multipath fading in the transmission process. For mobile communication systems, multipath fading may degrade the transmission quality of the signal, but prior art correlation techniques may be used to suppress multipath fading. However, with the rapid development of wireless communication, the required operating bandwidth of wireless communication is relatively wide, and the narrow operating bandwidth of the MIMO antenna limits its application in the rapidly-developed wireless communication field. In addition, the dual-polarized antenna has the advantage of an electric tuning antenna, and the dual-polarized antenna is used in a mobile communication network as the electric tuning antenna, so that call loss can be reduced, interference can be reduced, and the service quality of the whole network can be improved.
The MIMO antenna utilizes spatial multiplexing, beam forming and space-time coding techniques, can greatly improve corresponding communication space capacity, and enlarge the coverage area of a wireless communication system. The MIMO technique refers to transmitting signals through various antennas and then receiving signals through a plurality of antennas at the same time. But with the accompanying mutual coupling between signals, the key to MIMO technology is to effectively avoid interference between MIMO antennas to distinguish multiple parallel data streams. Therefore, it is desirable to design a MIMO antenna with high isolation.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a dual polarization MIMO antenna array aims at solving traditional MIMO antenna and can not avoid the interference problem between the MIMO antenna well.
The embodiment of the utility model provides a so realize, a dual polarization MIMO antenna array, dual polarization MIMO antenna array includes four antenna element, four antenna element are two pairwise mirror image mode setting;
the antenna unit at least comprises a dielectric substrate, an antenna patch, a feed microstrip line and a feed gap;
the number of the dielectric substrates is two or more, and the two or more dielectric substrates are sequentially stacked;
when the number of the dielectric substrates is two, a grounding plate is arranged on the surface of one side, close to the first layer of the dielectric substrate, of the second layer of the dielectric substrate; the two feed gaps are arranged on the grounding plate in a T shape; the projections of the two feed gaps on the surface of the second layer of dielectric substrate do not intersect; the antenna patch is arranged on the surface of one side of the first layer of dielectric substrate, which is far away from the second layer of dielectric substrate, and is used as an antenna main body to radiate electromagnetic waves; the two feed microstrip lines are respectively arranged on the surface of one side of the second layer of dielectric substrate far away from the first layer of dielectric substrate, the two feed microstrip lines are respectively and vertically intersected with the corresponding feed gap space interlayer, and one end of the feed microstrip line far away from the feed gap extends to the side of the outer edge of the second layer of dielectric substrate to form a feed port.
Preferably, the antenna unit further includes a metal reflector plate, and the metal reflector plate is disposed on a side of the second dielectric substrate far from the first dielectric substrate.
Preferably, the input impedance of the antenna unit is 50 ohms with a center frequency of 3.5GHz; the dielectric constant of the dielectric substrate is 3.6-3.7, and the thickness h is 0.507-0.509mm.
Preferably, the feed slot is an H-shaped aperture slot, and the opening directions of the two H-shaped aperture slots are perpendicular to each other; the length directions of the two feed microstrip lines are mutually vertical.
Preferably, the two H-shaped aperture slots have different apertures and sizes, and the two feed microstrip lines have different lengths.
Preferably, the two H-shaped aperture slots are a first H-shaped slot and a second H-shaped slot respectively, wherein the length C1 of the two first slot segments of the first H-shaped slot is 4.85-4.95mm, and the length T1 of the second slot segment of the first H-shaped slot is 11.90-11.99mm; the length C2 of the two first groove sections of the second H-shaped groove is 5.38-5.42mm, and the length T2 of the second groove section of the second H-shaped groove is 11.62-11.68mm.
Preferably, the distance between any two adjacent antenna patches is 90mm.
Preferably, the antenna patch is a square structure; the four sides of the square structure are respectively parallel to the four sides of the medium substrate, and the side length of the square structure is 29.80-29.90mm.
Preferably, the number of the dielectric substrates is more than two, and the more than two dielectric substrates are sequentially stacked; the antenna patch, the feed microstrip line and the feed gap are respectively arranged on the dielectric substrates on different layers, and the distance between the antenna patch and the feed microstrip line is positively correlated with the layer number of the dielectric substrate; and a ground plate is arranged on one layer of dielectric substrate between the antenna patch and the feed microstrip line, and the feed gap is formed in the ground plate.
Preferably, the feed microstrip line is a strip microstrip line; or the feed microstrip line is a variable-diameter microstrip line, and the diameter of one end of the variable-diameter microstrip line, which is close to the feed gap, is smaller than that of the other end of the variable-diameter microstrip line.
The embodiment of the utility model provides a dual polarization MIMO antenna array, four antenna elements that adopt, when realizing the multiple input multiple output, two bisymmetry mode sets up, has kept possessing enough intervals between each antenna element, and then has high isolation; the antenna patch and the feed microstrip line which are arranged on the interlayer are matched with the feed gap arranged on the ground plate, so that the isolation between the antenna units is improved.
Drawings
Fig. 1 is a schematic structural diagram of a dual-polarization MIMO antenna array according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of a dual-polarization MIMO antenna array according to an embodiment of the present invention;
fig. 3 is a schematic front view of an antenna unit according to an embodiment of the present invention;
fig. 4 is an S parameter diagram according to an embodiment of the present invention;
fig. 5 is a signal correlation coefficient diagram of a homopolarized port according to an embodiment of the present invention;
fig. 6 is a polarization level parameter diagram of an antenna unit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an antenna unit according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an H-shaped slot and a feed microstrip line in an antenna unit according to an embodiment of the present invention;
fig. 9 is an S11 parameter diagram of an antenna unit according to an embodiment of the present invention;
fig. 10 shows-45 ° and +45 ° polarization patterns of an antenna unit according to an embodiment of the present invention;
fig. 11 is a two-dimensional gain diagram of an antenna unit according to an embodiment of the present invention.
In the drawings: a 10-dual polarization MIMO antenna array; 11-a first feeding port; 12-a second feeding port; 13-a third feeding port; 14-a fourth feeding port; 15-a fifth feeding port; 16-a sixth feeding port; 17-a seventh feed port; 18-an eighth feed port; 100-an antenna element; 101-a first layer of dielectric substrate; 102-an antenna patch; 110-feed slot; 111-a first H-shaped groove; 112-a second H-shaped groove; 201-a second layer dielectric substrate; 202-ground plane; 203-feed microstrip line; 2031-a first feed microstrip line; 2032-a second feed microstrip line; 301-metal reflector plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description is provided to illustrate specific embodiments of the present invention.
As shown in fig. 1, for the embodiment of the present invention provides a structure diagram of a dual-polarization MIMO antenna array, including: the antenna comprises four antenna units 100, wherein the four antenna units 100 are arranged in a pairwise mirror image mode;
the antenna unit 100 at least includes a dielectric substrate, an antenna patch 102, a feed microstrip line 203 and a feed slot 110, see fig. 7-8;
the number of the dielectric substrates is two or more, and the two or more dielectric substrates are sequentially stacked;
when the number of the dielectric substrates is two, a grounding plate 202 is arranged on the surface of one side of the second dielectric substrate 201 close to the first dielectric substrate 101; the two feed gaps 110 are arranged on the ground plate 202 in a T shape; and the projections of the two feed slots 110 on the surface of the second layer dielectric substrate 201 do not intersect; the antenna patch 102 is arranged on the surface of one side of the first layer dielectric substrate 101 away from the second layer dielectric substrate 201, and is used as an antenna main body to radiate electromagnetic waves; the two feed microstrip lines 203 are respectively arranged on the surface of one side of the second-layer dielectric substrate 201 away from the first-layer dielectric substrate 101, the two feed microstrip lines 203 are respectively vertically intersected with the corresponding feed gap 110 space interlayer, and one end of the feed microstrip line 203 away from the feed gap 110 extends to the outer edge side of the second-layer dielectric substrate 201 to form a feed port.
In this embodiment, the dual-polarization MIMO antenna array 10 includes eight feeding ports, and the eight feeding ports greatly increase the corresponding communication space capacity; the antenna units 100 are arranged in a pairwise symmetric manner to form a 2 x 2MIMO antenna array, so that the design performance is met; the antenna units 100 can be kept to have enough distance conveniently, and the distance between the two antenna units 100 can be changed to improve the isolation between the two antenna units 100; the design of the antenna is completed by carrying out two ways of placing H-shaped aperture slots in a T shape through the slot feed and the grounding plate 202, and the isolation between unit ports is improved. The antenna unit 100 adopts a feeding mode of slot feeding, and the working frequency of the antenna is determined by the size of the antenna; the larger the antenna size, the higher the frequency; the center frequency of the antenna is 3.5GHz, and the reflection coefficient S11 of the antenna is lower than-20 dB in an operating frequency band.
In one example, eight feed ports are respectively represented as: a first feed port 11, a second feed port 12, a third feed port 13, a fourth feed port 14, a fifth feed port 15, a sixth feed port 16, a seventh feed port 17 and an eighth feed port 18, see fig. 2.
As shown in fig. 2, in an example of an embodiment, the four antenna units 100 are arranged in a two-by-two mirror image manner, specifically, two antenna units 100 are arranged in a mirror image symmetry manner at a set distance (which may be 90 mm), and then two antenna units 100 are continuously arranged in a downward mirror image symmetry manner, so as to form a 2 × 2mimo antenna array, and since each antenna unit 100 is a dual-polarized antenna, a dual-polarized MIMO antenna array 10 is obtained.
In an example of an embodiment, the distance between any two adjacent antenna patches 102 is 90mm.
As shown in fig. 1, in an example of an embodiment, the number of the dielectric substrates is two or more, and the two or more dielectric substrates are sequentially stacked; the antenna patch 102, the feed microstrip line 203 and the feed slot 110 are respectively arranged on different layers of dielectric substrates, and the distance between the antenna patch 102 and the feed microstrip line 203 is positively correlated with the number of layers of the dielectric substrates, i.e., the larger the number of layers of the dielectric substrates is, the larger the distance between the antenna patch 102 and the feed microstrip line 203 is; and a ground plate 202 is arranged on one of the dielectric substrates between the antenna patch 102 and the feed microstrip line 203, and the feed slot 110 is opened on the ground plate 202. Specifically, the number of the dielectric substrates may be three, four, five, six, or the like.
In an example of an embodiment, a dielectric layer may be filled between the antenna patch 102 and the feeding microstrip line 203 to adjust a distance between the two, and a material of the dielectric layer may be teflon, or may be another insulating material.
In this embodiment, as shown in fig. 8, two feed microstrip lines 203 in the antenna unit 100 form a feed network on a single layer, the antenna patch 102 and the feed microstrip line 203 are not on the same layer, and the middle is isolated by the ground plate 202, so that the additional radiation influence of the feed network is reduced to a great extent; the two feeding slots 110 on the ground plate 202 are perpendicular to each other and are arranged in a T shape, which enables the two polarized feeding ports to generate a better isolation.
In one embodiment, since the feed microstrip line 203 generates backward radiation, the radiation performance of the antenna is negatively affected;
as shown in fig. 1 and fig. 2, in an embodiment, the antenna unit 100 further includes a metal reflector 301, where the metal reflector 301 is disposed on a side of the second dielectric substrate 201 away from the first dielectric substrate 101.
In the embodiment, the metal reflecting plate 301 is arranged, so that the backward radiation can be reduced, and the radiation efficiency can be improved; the feed microstrip line 203 is arranged on a single layer, provides a large space for the design of the feed microstrip line 203, is easy to integrate with a radio frequency circuit, and has wide market prospect.
As shown in fig. 2, in one embodiment, the input impedance of the antenna unit 100 is 50 ohms with a center frequency of 3.5GHz; the dielectric constant of the dielectric substrate is 3.6-3.7, and the thickness h is 0.507-0.509mm.
In an example of an embodiment, the dielectric substrate has a dielectric constant of 3.6;
in an example of an embodiment, the dielectric substrate has a dielectric constant of 3.66;
in an example of an embodiment, the dielectric substrate has a dielectric constant of 3.7;
in an example of an embodiment, the dielectric substrate has a thickness h of 0.507mm, 0.508mm or 0.509mm; preferably 0.508mm.
As shown in fig. 7, the antenna unit 100 (or called antenna main body, antenna for short) adopts a slot feeding mode, the dielectric substrate of the antenna unit 100 selects RO4350 (65mm x 65mm), the antenna size is 29.9, 29.9 х 29.9.9 mm, and the ground plane is 65mm x 65mm; the height of the first layer dielectric substrate 101 and the second layer dielectric substrate 201 is determined to be 5.1mm through simulation optimization, and the height between the second layer dielectric substrate 201 and the metal reflecting plate 301 is determined to be 8.5mm. The center frequency of the antenna is 3.5GHz, and the reflection coefficient S11 of the antenna is lower than-20 dB in an operating frequency band.
The simulation was performed using an antenna unit 100 of RO4350 (65mm x 65mm) as an example. As a result, as shown in fig. 4 to fig. 6, both the isolation and the antenna gain of the dual-polarized MIMO antenna array 10 satisfy the engineering design index.
The RO4350 dielectric substrate in the example has high mechanical property and dielectric property, good heat resistance and good mechanical processing property with moisture resistance.
In one embodiment, the dual-polarized MIMO antenna array 10 includes eight feeding ports, and the eight feeding ports greatly increase the corresponding communication space capacity.
Typically, the MIMO project specification S21 given in the project requires less than-15 dB. However, when designing an antenna, the performance of the antenna may be affected for various reasons. Therefore, simulations require that the isolation S21 should be below-20 dB, leaving room for appropriate choices for subsequent processing and testing. S21 reflects the energy transfer coefficient, which is also the isolation coefficient or degree of isolation of the antenna, transferred from one antenna to another. The smaller the isolation, i.e. the less energy is transferred from one port to the other, the higher the corresponding isolation. The distance between the two antenna elements 100 is changed to improve the isolation between the two antenna elements 100, and the signal correlation coefficient of the ports in engineering is less than 0.2, as shown in fig. 5, which is the correlation coefficient of the same-polarization ports of the feed port 2, the feed port 4, the feed port 6, and the feed port 8, respectively, and far meets the engineering requirements. In addition, the input impedance of the antenna port is 50 ohms, and the center frequency is 3.5GHz; the radiation characteristic is excellent, and the size of the whole antenna is reduced.
As shown in fig. 3, in an embodiment, the feeding slot 110 is an H-shaped aperture slot, two H-shaped aperture slots are a first H-shaped slot 111 and a second H-shaped slot 112, and the opening directions of the first H-shaped slot 111 and the second H-shaped slot 112 are perpendicular to each other; the length directions of the two feed microstrip lines 203 are perpendicular to each other; the two feeding microstrip lines 203 are a first feeding microstrip line 2031 and a second feeding microstrip line 2032.
In this embodiment, in the antenna unit 100, the feeding modes of the two feeding microstrip lines 203 are both aperture coupling feeding, and the characteristic impedance is 50 Ω; the feed microstrip line 203 is open-ended, and the impedance matching can be adjusted by adjusting the length of the feed microstrip line 203; the purposes of expanding the working bandwidth of the antenna and improving the gain of the antenna are achieved by adopting methods that two H-shaped aperture slots are perpendicular to each other and are arranged in a T shape, aperture coupling feeding is carried out, the antenna works in a frequency band of 3.4GHz-3.6GHz, the center frequency is 3.5GHz, and the antenna has the characteristics of low side lobe and low cross polarization.
In one embodiment, the two H-shaped aperture slots have different apertures and sizes, and the two feed microstrip lines 203 have different lengths.
In an example of an embodiment, the two feeding microstrip lines 203 are a first feeding microstrip line 2031 and a second feeding microstrip line 2032 respectively, the length Ha of the first feeding microstrip line 2031 is 27.25mm, and the length Hb of the second feeding microstrip line 2032 is 23.9mm;
in an example of an embodiment, the two H-shaped aperture slots are a first H-shaped slot 111 and a second H-shaped slot 112, respectively, wherein the two first slot segment lengths C1 of the first H-shaped slot 111 are 4.85-4.95mm, and the length T1 of the second slot segment of the first H-shaped slot 111 is 11.90-11.99mm; the two first channel section lengths C2 of the second H-shaped channel 112 are 5.38-5.42mm and the second channel section length T2 of the second H-shaped channel 112 is 11.62-11.68mm.
The simulation of the antenna unit 100 resulted in fig. 9-11, fig. 9 is a diagram of S11 of the antenna unit, and it can be seen from fig. 9 that the bandwidth of the antenna unit below-10 dB is 3.32GHz-3.65GHz, and the center frequency thereof is 3.5GHz. Fig. 10 is the polarization patterns of-45 ° and +45 ° of the antenna unit at 3.5GHz, and it can be seen from fig. 10 that the gain of two ports of the antenna unit reaches 9.2dB at the frequency point of 3.5GHz, and the cross polarization level of the E plane and the H plane of the two ports is less than-40 dB in the main radiation direction of the antenna, so that good isolation is achieved. Fig. 11 is a plane gain diagram of the antenna unit, and as can be seen from fig. 11, the gain of the dual-polarized slot-coupled antenna is 9.29dB; and the engineering design requirements are met.
In one embodiment, the antenna patch 102 is a square structure; the four sides of the square structure are respectively parallel to the four sides of the medium substrate, and the side length of the square structure is 29.80-29.90mm.
In one example, the sides of the square structure are 29.80mm, 29.85mm, or 29.90mm.
In one example, antenna patch 102 may also be a rectangular structure, without limitation.
In one example, the ground plate 202 is a metal plate, a metal foil, or a metal sheet. The metal plate and the dielectric substrate are equal in size, are located on the upper surface of the second-layer dielectric substrate 201 and are in contact with the lower surface of the first-layer dielectric substrate 101, and are made of copper, so that cost can be reduced.
As shown in fig. 3, in one embodiment, the feeding microstrip line 203 is a strip microstrip line; or the feed microstrip line 203 is a variable-diameter microstrip line, and the diameter of one end of the variable-diameter microstrip line close to the feed gap 110 is smaller than that of the other end.
In one example, the strip-shaped microstrip lines are metal microstrip lines, and the line widths of the metal microstrip lines are equal;
in one example, the feeding microstrip line 203 is a tapered microstrip line, which may also be a metal microstrip line, such as: copper wire, copper alloy wire; the diameter-variable microstrip line can be two sections of diameter-variable lines, or three sections of diameter-variable lines, more than three sections of diameter-variable lines and the like.
The embodiment of the utility model provides a dual polarization MIMO antenna array, four antenna elements that adopt, when realizing the multiple input multiple output, two bisymmetry mode sets up, has kept possessing enough intervals between each antenna element, and then has high isolation; the antenna patch 102 and the feed microstrip line 203 which are arranged on the interlayer are matched with the feed gap 110 arranged on the ground plate 202, and are fed by the feed microstrip line 203, so that the transmission speed and the frequency spectrum utilization rate can be improved under the condition of keeping the transmitting power of the antenna unchanged, and the reliability of the antenna is improved; the isolation between the antenna elements is improved by means of slotting, slot feeding and the like. Simulation results show that the isolation between the antenna units and the antenna gain meet engineering requirements.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A dual-polarization MIMO antenna array is characterized in that the dual-polarization MIMO antenna array comprises four antenna units, and the four antenna units are arranged in a pairwise mirror image manner;
the antenna unit at least comprises a dielectric substrate, an antenna patch, a feed microstrip line and a feed gap;
the number of the dielectric substrates is two or more, and the two or more dielectric substrates are sequentially stacked;
when the number of the dielectric substrates is two, a grounding plate is arranged on the surface of one side, close to the first layer of dielectric substrate, of the second layer of dielectric substrate; the two feed gaps are arranged on the grounding plate in a T shape; the projections of the two feed gaps on the surface of the second layer of dielectric substrate do not intersect; the antenna patch is arranged on the surface of one side, away from the second layer of dielectric substrate, of the first layer of dielectric substrate and used as an antenna main body to radiate electromagnetic waves; the two feed microstrip lines are respectively arranged on the surface of one side of the second layer of dielectric substrate far away from the first layer of dielectric substrate, the two feed microstrip lines are respectively and vertically intersected with the corresponding feed gap space interlayer, and one end of the feed microstrip line far away from the feed gap extends to the side of the outer edge of the second layer of dielectric substrate to form a feed port.
2. The dual polarized MIMO antenna array of claim 1, wherein the antenna elements further comprise a metallic reflector plate disposed on a side of the second layer dielectric substrate remote from the first layer dielectric substrate.
3. A dual polarized MIMO antenna array according to claim 1 or 2, wherein the input impedance of the antenna elements is 50 ohms, with a center frequency of 3.5GHz; the dielectric constant of the dielectric substrate is 3.6-3.7, and the thickness h is 0.507-0.509mm.
4. The dual-polarized MIMO antenna array of claim 1, wherein the feed slots are H-shaped aperture slots, and the opening directions of the two H-shaped aperture slots are perpendicular to each other; the length directions of the two feed microstrip lines are mutually vertical.
5. The dual polarized MIMO antenna array of claim 4, wherein the apertures and sizes of the two H-shaped aperture slots are different, and the lengths of the two feed microstrip lines are different.
6. A dual polarized MIMO antenna array as claimed in claim 4 wherein the two H-shaped aperture slots are a first H-shaped slot and a second H-shaped slot respectively, wherein the two first slot segment lengths C1 of the first H-shaped slot are in the range of 4.85-4.95mm and the length T1 of the second slot segment of the first H-shaped slot is in the range of 11.90-11.99mm; the length C2 of the two first groove sections of the second H-shaped groove is 5.38-5.42mm, and the length T2 of the second groove section of the second H-shaped groove is 11.62-11.68mm.
7. The dual polarized MIMO antenna array of claim 1, wherein any two adjacent antenna patches are 90mm apart.
8. The dual polarized MIMO antenna array of claim 1, wherein the antenna patches are square in configuration; the four sides of the square structure are respectively parallel to the four sides of the medium substrate, and the side length of the square structure is 29.80-29.90mm.
9. The dual-polarized MIMO antenna array of claim 1, wherein the number of the dielectric substrates is two or more, and the two or more dielectric substrates are sequentially stacked; the antenna patch, the feed microstrip line and the feed gap are respectively arranged on the dielectric substrates on different layers, and the distance between the antenna patch and the feed microstrip line is positively correlated with the layer number of the dielectric substrate; and a ground plate is arranged on one layer of the dielectric substrate between the antenna patch and the feed microstrip line, and the feed gap is arranged on the ground plate.
10. The dual polarized MIMO antenna array of claim 1, wherein the feed microstrip line is a strip microstrip line; or the feed microstrip line is a variable-diameter microstrip line, and the diameter of one end of the variable-diameter microstrip line, which is close to the feed gap, is smaller than that of the other end of the variable-diameter microstrip line.
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