Broadband Quadri-Polarized Low-Profile Magnetoelectric Dipole Antenna Array for Millimeter-Wave Band

Abstract

The present invention discloses a broadband four-polarization low-profile magnetoelectric dipole antenna array applicable to the millimeter wave band, which relates to the field of antennas. For the broadband four-polarization low-profile magnetoelectric dipole antenna array applicable to the millimeter wave band of the present invention, the first feed source of each first antenna unit is arranged at its central position and is not connected to the surrounding patches; a plurality of first antenna units are arranged in an n×n matrix form, and a second feed source is arranged at each target position. Each second feed source is arranged with a 45-degree rotation relative to the position of the first feed source. Each second feed source and the surrounding patches form a second antenna unit, and the position where each second feed source passes through the surrounding patches is hollowed out and not connected to the surrounding patches. Compared with the traditional crossed dipole, the present invention can better achieve impedance matching, reduce the number of substrate layers, and simplify the structure. Compared with the traditional magnetoelectric dipole antenna array, the present invention greatly saves the occupied space, better reduces the multipath fading effect and polarization mismatch at high frequencies.

Description

Technical Field

[0001] The present invention relates to the field of antennas, and more particularly, to a broadband four-polarization low-profile magnetoelectric dipole antenna array suitable for millimeter-wave bands. Background Art

[0002] Currently, the demand for low-latency and high-system-capacity wireless communication systems is increasing day by day, which has promoted the improvement of communication frequencies, especially the exploration of the 5G millimeter-wave (mmW) band. Among them, the research on broadband millimeter-wave antenna arrays is of great significance for achieving high system capacity and solving the increased path loss brought by high-frequency transmission in 5G millimeter waves. The magnetoelectric dipole antenna has a relatively wide impedance bandwidth and stable radiation performance, which is a good solution for realizing millimeter-wave antenna arrays. However, the multipath fading effect and polarization mismatch of the antenna are more obvious at high frequencies. Therefore, there is an urgent need for a broadband millimeter-wave antenna with a simple structure, low cost, and stable radiation performance. Summary of the Invention

[0003] In view of the above problems, the present invention proposes a broadband four-polarization low-profile magnetoelectric dipole antenna array suitable for millimeter-wave bands to overcome the deficiencies of the prior art.

[0004] An embodiment of the present invention provides a broadband four-polarization low-profile magnetoelectric dipole antenna array, where the broadband four-polarization low-profile magnetoelectric dipole antenna array includes: a plurality of first antenna units and a plurality of second antenna units;

[0005] The first feed of each of the first antenna units is disposed at its central position and is not connected to the surrounding patches;

[0006] The plurality of first antenna units are arranged in an n×n matrix form, and a second feed is provided at each target position, where the target position is the intersection position of the first antenna units in adjacent rows and the first antenna units in adjacent columns;

[0007] Each of the second feeds is disposed with a 45-degree rotation relative to the position of the first feed. Each of the second feeds forms the second antenna unit with the surrounding patches, and each of the second feeds is hollowed out at the position corresponding to passing through the surrounding patches and is not connected to the surrounding patches.

[0008] Optionally, the patches around the first feed are horizontal patches;

[0009] The patches around the second feed are the horizontal patches;

[0010] The shape of the horizontal patch is square or rectangular.

[0011] Optionally, the first feed and the horizontal patch are disposed on the top surface of a single-layer substrate, and their upper surfaces are flush;

[0012] There is a preset gap between the lower surface of the second feeder and the upper surface of the horizontal patch.

[0013] Optionally, the first feeder and the second feeder have the same structure, both including: two pairs of crossed dipole arms, a central pad, and a coaxial feeder;

[0014] Two pairs of crossed dipole arms are arranged around the central pad, and each dipole arm is connected to the central pad through a diode;

[0015] One end of each dipole arm away from the central pad is bent;

[0016] The coaxial feeder is connected to the center position of the lower surface of the central pad.

[0017] Optionally, in the first antenna unit, four horizontal patches are symmetrically arranged around the first feeder, and the target angle of any horizontal patch close to the first feeder is located on the side of the dipole arm;

[0018] An extension structure is arranged at the diagonal of the target angle of each horizontal patch. The extension structure is a 90-degree bent vertical metal plate, which is perpendicular to the horizontal patch and faces the bottom surface of the single-layer substrate.

[0019] Optionally, among the four horizontal patches symmetrically arranged around the first feeder, two horizontally patches that cross each other form a pair of electric dipoles;

[0020] The extension structures of the horizontal patches corresponding to the pair of electric dipoles and the upper surface of the bottom surface of the single-layer substrate jointly form a pair of magnetic dipoles. The upper surface of the bottom surface of the single-layer substrate is a metal base surface.

[0021] Optionally, when the first antenna unit is excited, it operates in a horizontal polarization mode or a vertical polarization mode;

[0022] When the second antenna unit is excited, it operates in a +45-degree polarization mode or a -45-degree polarization mode.

[0023] Optionally, the width of the part where the 90-degree bent vertical metal plate is connected to the diagonal is less than a preset length;

[0024] The preset length is less than one-fifth of the total length of the target side. The target side is the two sides that form the diagonal in the horizontal patch.

[0025] Optionally, the broadband four-polarization low-profile magnetoelectric dipole antenna array further includes: a feeding network;

[0026] The feeding network is bonded to the bottom surface of the single-layer substrate through an adhesive film.

[0027] Optionally, the feeding network includes a 1~n×n power divider;

[0028] The 1~n×n power divider is composed of 1~n equal-power dividers connected in cascade.

[0029] The broadband four-polarization low-profile magnetoelectric dipole antenna array applicable to the millimeter-wave band proposed by the present invention includes: a plurality of first antenna units and a plurality of second antenna units. The first feed of each first antenna unit is arranged at its central position and is not connected to the surrounding patches; the plurality of first antenna units are arranged in an n×n matrix form, and a second feed is arranged at each target position, and the target position is the intersection position of the first antenna units in adjacent rows and the first antenna units in adjacent columns.

[0030] Each second feed is arranged with a 45-degree rotation relative to the position of the first feed. Each second feed and the surrounding patches form a second antenna unit, and the position where each second feed passes through the surrounding patches is hollowed out and not connected to the surrounding patches.

[0031] In the broadband four-polarization low-profile magnetoelectric dipole antenna array proposed by the present invention, polarization reconfiguration is realized on one feed, and the formed antenna array realizes four polarizations. The four dipole arms of all feeds are bent, and impedance matching can be better realized compared with the traditional crossed dipole. And the distance between each feed and the adjacent feed is large, and no additional copper layer is required to avoid direct contact between two adjacent feeds. Therefore, all feeding probes can be designed on the same copper layer (i.e., on a single-layer substrate), thereby reducing the number of substrate layers and simplifying the structure. And the distance between the feeding probes realizing two different dual polarizations is increased, making it more practical to realize a four-polarization feeding network in a single layer, and greatly saving the occupied space compared with the traditional magnetoelectric dipole antenna array. And by controlling the bias voltages of the four diodes, a four-polarization antenna array is realized, which better reduces the multipath fading effect and polarization mismatch at high frequencies, and has broad application prospects and high practicability. Description of the Drawings

[0032] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0033] Figure 1 is a schematic structural diagram shown by taking a 4×4 antenna array structure as an example in an embodiment of the present application;

[0034] FIG. 2(a) is a schematic overall structural diagram of a preferred first antenna unit in an embodiment of the present application;

[0035] Figure 2(b) is a schematic structural diagram of a dipole arm in a preferred first antenna element in an embodiment of the present application;

[0036] Figure 2(c) is a top-view structural schematic diagram of a preferred first antenna element in an embodiment of the present application;

[0037] Figure 2(d) is a side-view structural schematic diagram of a preferred first antenna element in an embodiment of the present application;

[0038] Figure 3(a) is a schematic overall structural diagram of a preferred second antenna element in an embodiment of the present application;

[0039] Figure 3(b) is a top-view structural schematic diagram of a preferred second antenna element in an embodiment of the present application;

[0040] Figure 3(c) is a side-view structural schematic diagram of a preferred second antenna element in an embodiment of the present application;

[0041] Figure 4 is a schematic structural diagram of an exemplary feed network in an embodiment of the present application;

[0042] Figure 5 is a schematic structural diagram of the feed network bonded to the bottom surface of the single-layer substrate through an adhesive film in an embodiment of the present application;

[0043] In the figure: 10 is the feed of the first first-antenna unit; 101 is patch A of the first first-antenna unit; 102 is patch B of the first first-antenna unit; 103 is patch C of the first first-antenna unit; 104 is patch D of the first first-antenna unit; 20 is the feed of the second first-antenna unit; 201 is patch A of the second first-antenna unit; 202 is patch B of the second first-antenna unit; 203 is patch C of the second first-antenna unit; 204 is patch D of the second first-antenna unit; 30 is the feed of the third first-antenna unit; 301 is patch A of the third first-antenna unit; 302 is patch B of the third first-antenna unit; 303 is patch C of the third first-antenna unit; 304 is patch D of the third first-antenna unit; 40 is the feed of the fourth first-antenna unit; 401 is patch A of the fourth first-antenna unit; 402 is patch B of the fourth first-antenna unit; 403 is patch C of the fourth first-antenna unit; 404 is patch D of the fourth first-antenna unit; 50 is the feed of the second-antenna unit; 105 is an extension structure; 106, 107 are a pair of dipole arms in two pairs of crossed dipole arms; 108, 109 are the other pair of dipole arms in two pairs of crossed dipole arms; D1, D2, D3, D4 are diodes; 110 is a central pad; 111 is a coaxial feeder; 600 is a feeding network; 700 is an adhesive film; 800 is an antenna array; E is the target angle of patch A101 of the first first-antenna unit; F is the diagonal angle of the target angle of patch B102 of the first first-antenna unit; G is a hollow position; H is a preset gap. Detailed implementation manners

[0044] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are only a part of the embodiments of the present invention, rather than all the embodiments, and are not used to limit the present invention.

[0045] The inventor found that although the current magnetoelectric dipole antenna has a relatively wide impedance bandwidth and stable radiation performance, it is a good solution for realizing a millimeter-wave antenna array. However, the multipath fading effect and polarization mismatch of the antenna are more obvious at high frequencies.

[0046] Taking a current traditional magnetoelectric dipole antenna as an example, it uses two crossed-position Γ-shaped probes with different heights for feeding, which can provide ±45-degree polarization, and a director is loaded to improve the antenna gain. However, this magnetoelectric dipole antenna is not suitable for being designed into an array, and the director increases the antenna height and has a relatively high profile. The key is that the feeding ports are too close, and a multi-layer feeding network is required. It only has two polarization modes, which reduces the multipath fading effect compared to four polarizations, and has a weaker polarization mismatch ability.

[0047] Another traditional magnetoelectric dipole antenna can form an antenna array and has a compact structure. However, it separately feeds the cross-feeders to achieve dual polarization, fails to achieve quadrupole polarization, and cannot effectively reduce the multipath fading effect and polarization mismatch.

[0048] Based on the problems existing in the above-mentioned traditional magnetoelectric dipole antennas and antenna arrays, the inventor creatively proposed a broadband quadrupole-polarized low-profile magnetoelectric dipole antenna array applicable to the millimeter wave band of the present invention. The technical solution of the present invention will be explained and described in detail below.

[0049] A broadband quadrupole-polarized low-profile magnetoelectric dipole antenna array applicable to the millimeter wave band proposed by the present invention includes a plurality of first antenna units and a plurality of second antenna units.

[0050] The first feeder of each first antenna unit is arranged at its central position and is not connected to the surrounding patches; a plurality of first antenna units are arranged in an n×n matrix form, and a second feeder is arranged at each target position, which is the position where the first antenna units in adjacent rows and the first antenna units in adjacent columns intersect.

[0051] Each second feeder is arranged with a 45-degree rotation relative to the position of the first feeder. Each second feeder and the surrounding patches form a second antenna unit, and the position where each second feeder passes through the surrounding patches is hollowed out and not connected to the surrounding patches.

[0052] For a better understanding of the broadband quadrupole-polarized low-profile magnetoelectric dipole antenna array proposed by the present invention, refer to Figure 1 the structural schematic diagram shown by taking a 4×4 antenna array structure as an example. Figure 1 On the left side of the horizontal line is the overall schematic diagram, and on the right side of the horizontal line is the top view. Taking a first antenna unit in the upper left corner as an example: the feeder 10 of the first first antenna unit, the four patches of the first first antenna unit: the center positions of the patch A101, the patch B102, the patch C103, and the patch D104 of the first first antenna unit, and the feeder 10 of the first first antenna unit is not connected to the four patches: the patch A101, the patch C103, and the patch D104 of the first first antenna unit.

[0053] The row where the first first - antenna unit is located and the row where the adjacent second first - antenna unit (formed by the feed 20 of the second first - antenna unit and the four patches of the second first - antenna unit: patch A201 of the second first - antenna unit, patch B202 of the second first - antenna unit, patch C203 of the second first - antenna unit, patch D204 of the second first - antenna unit) is located, and the column where the first first - antenna unit is located and the column where the adjacent third first - antenna unit (formed by the feed 30 of the third first - antenna unit and the four patches of the third first - antenna unit: patch A301 of the third first - antenna unit, patch B302 of the third first - antenna unit, patch C303 of the third first - antenna unit, patch D304 of the third first - antenna unit) is located. The intersection position between them is a target position. A feed, that is, the feed 50 of the second - antenna unit, is set at this target position. The feed 50 of the second - antenna unit is set at 45 degrees relative to the feeds 10 of the first first - antenna unit, 20 of the second first - antenna unit, 30 of the third first - antenna unit, and 40 of the fourth first - antenna unit. It forms the second - antenna unit with the surrounding patches: patch D104 of the first first - antenna unit, patch B202 of the second first - antenna unit, patch C303 of the third first - antenna unit, and patch A401 of the fourth first - antenna unit. And the feed 50 of the second - antenna unit correspondingly passes through the positions of the surrounding patches: patch D104 of the first first - antenna unit, patch B202 of the second first - antenna unit, patch C303 of the third first - antenna unit, and patch A401 of the fourth first - antenna unit which are hollowed out and not connected to the surrounding patches. That is, the second - antenna unit is formed by taking the feed 50 of the second - antenna unit as the center and four patches of the four first - antenna units respectively, that is: patch D104 of the first first - antenna unit, patch B202 of the second first - antenna unit, patch C303 of the third first - antenna unit, and patch A401 of the fourth first - antenna unit, which are dispersed around.

[0054] Preferably, the patches around the first feed are horizontal patches; naturally, the patches around the second feed are also horizontal patches; the shape of the horizontal patch is optimally square or rectangular. Of course, it can be understood that it can also be other shapes: such as circular, oval, irregular polygon, etc. However, the antenna array formed by such shapes may occupy a larger volume than the antenna array formed by square or rectangular patches. Which shape to choose specifically can be determined according to actual needs.

[0055] For the first - antenna unit and the second - antenna unit, both can be fabricated on a single - layer substrate instead of on a multi - layer substrate, greatly reducing the profile of the antenna array.

[0056] To better understand the first antenna element, refer to the schematic diagram of the overall structure of a preferred first antenna element shown in Fig. 2(a). In Fig. 2(a), the feed 10 of the first antenna element and four patches: patch A101 of the first antenna element, patch B102 of the first antenna element, patch C103 of the first antenna element, and patch D104 of the first antenna element are arranged on the top surface of a single-layer substrate, and their upper surfaces are flush, as exemplarily shown in the schematic side view structure diagram of a preferred first antenna element shown in Fig. 2(d).

[0057] In the first antenna element, referring to the schematic top view structure diagram of a preferred first antenna element shown in Fig. 2(c), four patches: patch A101 of the first antenna element, patch B102 of the first antenna element, patch C103 of the first antenna element, and patch D104 of the first antenna element are symmetrically arranged around the feed 10 of the first antenna element, and any patch is close to the target corner of the first feed. For example: in Fig. 2(c), the target corner E of patch A101 of the first antenna element is exemplarily marked on the side of the dipole arm.

[0058] And at the diagonal of the target corner in each patch, for example: in Fig. 2(c), the diagonal F of the target corner of patch B102 of the first antenna element is exemplarily marked, and an extension structure is provided. The extension structure is a 90-degree bent vertical metal plate. For example: in Fig. 2(c), the extension structure 105 of the diagonal F of patch B102 of the first antenna element is exemplarily marked, which is perpendicular to the patch. For example: the extension structure 105 of diagonal F in Fig. 2(c): the 90-degree bent vertical metal plate is perpendicular to patch B102 of the first antenna element and faces the bottom surface of the single-layer substrate. And the width of the part where the 90-degree bent vertical metal plate is connected to the diagonal is less than a preset length. The preset length refers to: less than one-fifth of the total length of the target side. The so-called target side is the two sides that form the diagonal in the patch.

[0059] Based on the above structure, among the four patches symmetrically arranged around the feed 10 of the first antenna element: patch A101 of the first antenna element, patch B102 of the first antenna element, patch C103 of the first antenna element, and patch D104 of the first antenna element, two cross-opposite patches form a pair of electric dipoles; that is, patch A101 of the first antenna element and patch D104 of the first antenna element form a pair of electric dipoles; patch B102 of the first antenna element and patch C103 of the first antenna element form another pair of electric dipoles.

[0060] The extended structures of the patches corresponding to a pair of electric dipoles, that is: the extended structures corresponding to the patch A101 of the first first antenna unit and the patch D104 of the first first antenna unit, together with the bottom and top surfaces of the single-layer substrate, form a pair of magnetic dipoles; the extended structures corresponding to the patch B102 of the first first antenna unit and the patch C103 of the first first antenna unit, together with the bottom and top surfaces of the single-layer substrate, form a pair of magnetic dipoles. Among them, the bottom and top surfaces of the single-layer substrate are metal base surfaces.

[0061] For the first feed source and the second feed source, their structures are exactly the same, both including two pairs of crossed dipole arms, a central pad, and a coaxial feeder. As shown in Figure 2(b), it is a schematic diagram of a preferred dipole arm structure of the first antenna unit: among the two pairs of crossed dipole arms, 106 and 107 are a pair of dipole arms, 108 and 109 are the other pair of dipole arms, which are arranged around the central pad 110, and each dipole arm is connected to the central pad through a diode; for example, in Figure 2(b), one pair of dipole arms 106 and 107 among the two pairs of crossed dipole arms are respectively connected to the central pad 110 through diodes D1 and D3; the other pair of dipole arms 108 and 109 among the two pairs of crossed dipole arms are respectively connected to the central pad 110 through diodes D2 and D4. The end of each dipole arm far from the central pad is bent. The coaxial feeder 111 is connected to the center position of the lower surface of the central pad 110.

[0062] The second antenna unit has two differences compared with the first antenna unit. One is that the position of its second feed source is rotated 45 degrees relative to the first feed source. The other is that due to the change in the position of the second feed source, if the upper surface of the second feed source is flush with the upper surface of the patch, there will be an overlapping area between the dipole arms and the surrounding patches, affecting the antenna polarization. To overcome this problem, the second feed source is hollowed out at the position corresponding to passing through its surrounding patches and is not connected to the surrounding patches, and there is a preset gap between the lower surface of the second feed source and the upper surface of the patch.

[0063] Referring to Fig. 3 (a), a schematic diagram of the overall structure of a preferred second antenna unit is shown. The feed source 50 of the second antenna unit, that is, the second feed source is rotated 45 degrees relative to the feed source 10 of the first first antenna unit and is arranged at the center of the patch D104 of the first first antenna unit, the patch B202 of the second first antenna unit, the patch C303 of the third first antenna unit, and the patch A401 of the fourth first antenna unit, as shown in Fig. 3 (a). The feed source 50 of the second antenna unit passes through the patches around it: the patch D104 of the first first antenna unit, the patch B202 of the second first antenna unit, the patch C303 of the third first antenna unit, and the patch A401 of the fourth first antenna unit are hollowed out, for example: in the schematic diagram of the top view structure of a preferred second antenna unit shown in Figure 3 (b), G is exemplarily represented by hollowing out, and it is not connected to the surrounding patches, and there is a preset gap between the lower surface of the feed source 50 of the second antenna unit and the upper surfaces of the four patches, for example: in the schematic diagram of the side view structure of a preferred second antenna unit shown in Figure 3 (c), H is exemplarily represented by a preset gap, and the smaller the preset gap, the better, preferably not exceeding 0.2 mm.

[0064] For a broadband quadruple-polarized low-profile magneto-electric dipole antenna array, it also needs to include: a feeding network; the feeding network is bonded to the bottom surface of the single-layer substrate through an adhesive film. Figure 4 The schematic diagram of the structure of an exemplary feeding network is shown, which has two ports: port 1 and port 2. Theoretically, the feeding network includes 1~n×n power dividers; the 1~n×n power divider can be composed of 1~n equal power dividers in cascade. Figure 4 The feeding network corresponding to a 4×4 antenna array is shown schematically in FIG.

[0065] Reference Figure 5 The schematic diagram shows the structure of the feed network 600 bonded to the bottom surface of the single-layer substrate (i.e., the antenna array 800) through the adhesive film 700. Due to the staggered arrangement of the probes (i.e., the coaxial feed lines), two identical feed networks emitting different polarizations can be implemented on the same layer. For a 4×4 antenna array, 16 probes are used to excite the elements in each polarization mode, and a quad-polarized antenna array is realized by controlling the bias voltage of four diodes, which better mitigates the multipath fading effect and polarization mismatch at high frequencies.

[0066] In summary, the broadband four-polarization low-profile magnetoelectric dipole antenna array proposed by the present invention and applicable to the millimeter wave band includes: a plurality of first antenna units and a plurality of second antenna units. The first feed of each first antenna unit is disposed at its central position and is not connected to the surrounding patches; the plurality of first antenna units are arranged in an n×n matrix form, and a second feed is disposed at each target position, which is the position where the first antenna units in adjacent rows intersect with the first antenna units in adjacent columns.

[0067] Each second feed is disposed with a 45-degree rotation relative to the position of the first feed. Each second feed and the surrounding patches form a second antenna unit, and the position where each second feed passes through the surrounding patches is hollowed out and not connected to the surrounding patches.

[0068] The broadband four-polarization low-profile magnetoelectric dipole antenna array proposed by the present invention realizes polarization reconfiguration on one feed, and the formed antenna array realizes four polarizations. The four dipole arms of all feeds are bent, and impedance matching can be better achieved compared with traditional crossed dipoles. Moreover, the distance between each feed and the adjacent feed is relatively large, and no additional copper layer is required to avoid direct contact between two adjacent feeds. Therefore, all feeding probes can be designed on the same copper layer (i.e., a single-layer substrate), thereby reducing the number of substrate layers and simplifying the structure. And the distance between the feeding probes for realizing two different dual polarizations is increased, making it more practical to realize a four-polarization feeding network in a single layer, and greatly saving the occupied space compared with traditional magnetoelectric dipole antenna arrays. And by controlling the bias voltages of the four diodes, a four-polarization antenna array is realized, which better alleviates the multipath fading effect and polarization mismatch at high frequencies, and has broad application prospects and high practicality.

[0069] Although the preferred embodiments of the embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

[0070] Finally, it should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or terminal device comprising said element.

[0071] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the purpose of the present invention and the scope protected by the claims. All of these are within the protection scope of the present invention.

Claims

1. A broadband quad-polarized low-profile magneto-electric dipole antenna array suitable for the millimeter wave band, characterized in that: The broadband quad-polarized low-profile magneto-electric dipole antenna array comprises: a plurality of first antenna units, a plurality of second antenna units; The first feed source of each first antenna unit is set at the center position thereof and is not connected to the four patches around it; wherein, the four patches of the first first antenna unit among the plurality of first antenna units include: patch A101, patch B102, patch C103, patch D104; the four patches of the second first antenna unit include: patch A201, patch B202, patch C203, patch D204; the four patches of the third first antenna unit include: patch A301, patch B302, patch C303, patch D304; the four patches of the fourth first antenna unit include: patch A401, patch B402, patch C403, patch D401; A plurality of the first antenna units are arranged in an n×n matrix form, and a second feed source is provided at each target position, wherein an intersection between a row where a first first antenna unit is located and a row where an adjacent second first antenna unit is located, and between a column where the first first antenna unit is located and a column where an adjacent third first antenna unit is located is one of the target positions, and a patch D104 of the first first antenna unit, a patch B202 of the second first antenna unit, a patch C303 of the third first antenna unit, and a patch A401 of the fourth first antenna unit, together with a second feed source provided at the target position, form one of the second antenna units, and a row where the fourth first antenna unit is located is adjacent to a row where the third first antenna unit is located; Each of the second feed sources is rotated 45 degrees relative to the position of the first feed source, and each of the second feed sources and the patches around it form the second antenna unit, and each of the second feed sources is hollowed out at the position corresponding to the patches around it and is not connected to the surrounding patches.

2. The broadband quad-polarized low-profile magneto-electric dipole antenna array according to claim 1, characterized in that: The patches located around the first feed source are horizontal patches; The patches located around the second feed source are the horizontal patches; The horizontal patch is in the shape of a square or a rectangle.

3. The broadband quad-polarized low-profile magneto-electric dipole antenna array according to claim 2, characterized in that: The first feed source and the horizontal patch are arranged on the top surface of the single-layer substrate, and the upper surfaces of the two are flush; There is a preset gap between the lower surface of the second feed source and the upper surface of the horizontal patch.

4. The broadband quad-polarized low-profile magneto-electric dipole antenna array according to any one of claims 1 to 3, characterized in that: The first feed source and the second feed source have the same structure, and both include: two pairs of crossed dipole arms, a central pad, and a coaxial feed line; Two pairs of crossed dipole arms are arranged around the central pad, and each dipole arm is connected to the central pad via a diode; Each dipole arm is bent at one end away from the central pad; The coaxial feed line is connected to the center position of the lower surface of the central pad.

5. The broadband quad-polarized low-profile magneto-electric dipole antenna array according to claim 4, characterized in that: In the first antenna unit, four horizontal patches are symmetrically arranged around the first feed source, and a target angle of any horizontal patch close to the first feed source is located on the side of the dipole arm; An extension structure is provided at a corner opposite to the target corner in each horizontal patch. The extension structure is a 90-degree bent vertical metal plate, which is perpendicular to the horizontal patch and faces the bottom surface of the single-layer substrate.

6. The broadband quad-polarized low-profile magneto-electric dipole antenna array according to claim 5, characterized in that: Among the four horizontal patches symmetrically arranged around the first feed source, two horizontal patches that cross and face each other form a pair of electric dipoles; The extended structure of the horizontal patch corresponding to the pair of electric dipoles forms a pair of magnetic dipoles together with the bottom surface and the upper surface of the single-layer substrate, and the bottom surface and the upper surface of the single-layer substrate are metal base surfaces.

7. The broadband quad-polarized low-profile magneto-electric dipole antenna array according to claim 1, characterized in that: When the first antenna unit is excited, it operates in a horizontal polarization mode or a vertical polarization mode; When the second antenna unit is excited, it operates in a +45 degree polarization mode or a -45 degree polarization mode.

8. The broadband quad-polarized low-profile magneto-electric dipole antenna array according to claim 5, characterized in that: The width of the portion where the 90-degree bent vertical metal plate is connected to the diagonal portion is smaller than a preset length; The preset length is less than one fifth of the total length of the target side, and the target side is the two sides forming the diagonal angle in the horizontal patch.

9. The broadband quad-polarized low-profile magneto-electric dipole antenna array according to claim 1, characterized in that: The broadband quad-polarized low-profile magneto-electric dipole antenna array further includes: a feeding network; The feed network is bonded to the bottom surface of the single-layer substrate via an adhesive film.

10. The broadband quad-polarized low-profile magneto-electric dipole antenna array according to claim 9, characterized in that: The feed network includes a 1~n×n power divider; The 1~n×n power divider is composed of 1~n equal power dividers in cascade.

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