Broadband four-polarization low-profile magnetoelectric dipole antenna array suitable for millimeter wave band

Abstract

The invention discloses a broadband four-polarization low-profile magnetoelectric dipole antenna array suitable for a millimeter wave band, and relates to the field of antennas. According to the broadband four-polarization low-profile magnetoelectric dipole antenna array suitable for the millimeter wave band, a first feed source of each first antenna unit is arranged in the center of the first antenna unit and is not connected with patches on the periphery of the first antenna unit; the plurality of first antenna units are arranged in an n * n matrix form, each target position is provided with a second feed source, each second feed source is arranged by rotating 45 degrees relative to the position of the first feed source, and each second feed source and the patches around the second feed source form a second antenna unit; and each second feed source correspondingly penetrates through the position hollows of the patches around the second feed source and is not connected with the patches around the second feed source. Compared with a traditional cross dipole, the cross dipole can better achieve impedance matching. The number of substrate layers is reduced and the structure is simplified. Compared with a traditional magnetoelectric dipole antenna array, the occupied space is greatly saved. And the multipath fading effect and polarization mismatch under high frequency can be better reduced.

Description

Technical Field

[0001] The present invention relates to the field of antennas, and in particular to a broadband quadruple-polarization low-profile magneto-electric dipole antenna array suitable for millimeter wave bands. Background Art

[0002] The demand for low-latency and high-capacity wireless communication systems is growing, which has promoted the increase of communication frequency, especially the exploration of 5G millimeter wave (mmW) frequency band. Among them, the research on broadband millimeter wave antenna arrays is of great significance for achieving high system capacity and solving the increase in path loss caused by 5G millimeter wave high-frequency transmission. Magnetoelectric dipole antennas have a wide impedance bandwidth and stable radiation performance, and are a good solution for realizing millimeter wave antenna arrays. However, the multipath fading effect and polarization mismatch of antennas are more obvious at high frequencies. Therefore, there is an urgent need for broadband millimeter wave antennas with 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 quad-polarization low-profile magneto-electric dipole antenna array suitable for the millimeter wave band to overcome the shortcomings of the prior art.

[0004] An embodiment of the present invention provides a broadband quadruple-polarized low-profile magneto-electric dipole antenna array suitable for millimeter wave bands, wherein the broadband quadruple-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 of the first antenna units is arranged at the center thereof 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 source is arranged at each target position, and the target position is a position where adjacent rows of first antenna units intersect adjacent columns of first antenna units; 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.

[0005] Optionally, 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.

[0006] Optionally, 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.

[0007] Optionally, the first feed source and the second feed source have the same structure, both comprising: 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.

[0008] Optionally, 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.

[0009] Optionally, 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.

[0010] Optionally, 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.

[0011] Optionally, the width of the portion where the 90-degree bent vertical metal plate is connected to the diagonal portion is less 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.

[0012] Optionally, the broadband quad-polarization low-profile magneto-electric dipole antenna array further comprises: a feeding network; The feed network is bonded to the bottom surface of the single-layer substrate via an adhesive film.

[0013] Optionally, 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.

[0014] The broadband quadruple-polarized low-profile magnetoelectric dipole antenna array suitable for the millimeter wave band proposed by the present invention comprises: a plurality of first antenna units and a plurality of second antenna units. The first feed source of each first antenna unit is arranged at its center 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 source is arranged at each target position, which is the position where the adjacent row first antenna units intersect with the adjacent column first antenna units.

[0015] Each second feed source is rotated 45 degrees relative to the position of the first feed source, and each second feed source and the patches around it form a second antenna unit. Each second feed source is hollowed out at the position corresponding to the patches around it and is not connected to the patches around it.

[0016] The broadband quadruple-polarized low-profile magnetoelectric dipole antenna array proposed in the present invention realizes polarization reconstruction on a feed source, and the antenna array formed realizes quadruple polarization. The four dipole arms of all feed sources are bent, which can better realize impedance matching compared with the traditional cross dipole. In addition, the distance between each feed source and the adjacent feed source is large, and no additional copper layer is required to avoid direct contact between two adjacent feed sources. Therefore, all feeding probes can be designed on the same copper layer (that is, on a single-layer substrate), thereby reducing the number of substrate layers and simplifying the structure. And the distance between the feeding probes that realize two different dual polarizations is increased, making it more practical to realize a quadruple-polarized feeding network in a single layer, which greatly saves the occupied space compared with the traditional magnetoelectric dipole antenna array. And by controlling the bias voltage of the four diodes, a quadruple-polarized antenna array is realized, which better reduces the multipath fading effect and polarization mismatch at high frequencies, and has broad application prospects and high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 is a structural schematic diagram showing a 4×4 antenna array structure as an example in an embodiment of the present application; FIG2 (a) is a schematic diagram of the overall structure of a preferred first antenna unit in an embodiment of the present application; FIG2( b ) is a schematic diagram of the structure of a dipole arm in a preferred first antenna unit in an embodiment of the present application; FIG2( c ) is a schematic diagram of a top view of a preferred first antenna unit in an embodiment of the present application; FIG2( d ) is a schematic side view of a preferred first antenna unit in an embodiment of the present application; FIG3 (a) is a schematic diagram of the overall structure of a preferred second antenna unit in an embodiment of the present application; FIG3( b ) is a schematic diagram of a top view of a preferred second antenna unit in an embodiment of the present application; FIG3 (c) is a schematic side view of a preferred second antenna unit in an embodiment of the present application; Figure 4 is a schematic structural diagram of an exemplary feeding network in an embodiment of the present application; Figure 5 is a schematic structural diagram of a feeding network in an embodiment of the present application bonded to the bottom surface of a single-layer substrate via an adhesive film; In the figure: 10, the feed source of the first first antenna unit; 101, the patch A of the first first antenna unit; 102, the patch B of the first first antenna unit; 103, the patch C of the first first antenna unit; 104, the patch D of the first first antenna unit; 20, the feed source of the second first antenna unit; 201, the patch A of the second first antenna unit; 202, the patch B of the second first antenna unit; 203, the patch C of the second first antenna unit; 204, the patch D of the second first antenna unit; 30, the feed source of the third first antenna unit; 301, the patch A of the third first antenna unit; 30 2. Patch B of the third first antenna unit; 303. Patch C of the third first antenna unit; 304. Patch D of the third first antenna unit; 40. Feed source of the fourth first antenna unit; 401. Patch A of the fourth first antenna unit; 402. Patch B of the fourth first antenna unit; 403. Patch C of the fourth first antenna unit; 404. Patch D of the fourth first antenna unit; 50. Feed source of the second antenna unit; 105. Extension structure; 106, 107. One pair of dipole arms in the two pairs of crossed dipole arms; 108, 109. Another pair of dipole arms in the two pairs of crossed dipole arms; D1, D2, D3, D4, diodes; 110, central pad; 111, coaxial feed line; 600, feeding network; 700, adhesive film; 800, antenna array; E, target angle of patch A101 of the first first antenna unit; F, diagonal of the target angle of patch B102 of the first first antenna unit; G, hollow position; H, preset gap. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, are only part of the embodiments of the present invention, not all of the embodiments, and are not used to limit the present invention.

[0019] The inventors have found that although the current magnetoelectric dipole antenna has a wide impedance bandwidth and stable radiation performance, and is a good solution for realizing a millimeter wave antenna array, the multipath fading effect and polarization mismatch of the antenna are more obvious at high frequencies.

[0020] Taking a traditional magnetoelectric dipole antenna as an example, it uses two cross-positioned Γ-shaped probes at different heights for feeding, can provide ±45 degree polarization, and is loaded with a director to improve antenna gain. However, the magnetoelectric dipole antenna is not suitable for array design, and the director increases the height of the antenna, giving it a higher profile. The key is that the feeding port is too close, requiring a multi-layer feeding network. It only has two polarization modes, which reduces the multipath fading effect compared to quad-polarization, and has weaker polarization mismatch capability.

[0021] Another traditional magneto-electric dipole antenna can form an antenna array with a compact structure, but it feeds the cross feed source separately to achieve dual polarization, but fails to achieve quadruple polarization, and cannot effectively reduce multipath fading effects and polarization mismatch.

[0022] Based on the above problems of the traditional magnetoelectric dipole antenna and antenna array, the inventor creatively proposed a broadband quad-polarized low-profile magnetoelectric dipole antenna array suitable for the millimeter wave band of the present invention. The technical solution of the present invention is explained and illustrated in detail below.

[0023] The present invention provides a broadband quadruple-polarization low-profile magneto-electric dipole antenna array suitable for a millimeter wave band. The broadband quadruple-polarization low-profile magneto-electric dipole antenna array comprises: a plurality of first antenna units and a plurality of second antenna units.

[0024] The first feed source of each first antenna unit is set at its center position and is not connected to the surrounding patches; multiple first antenna units are arranged in an n×n matrix form, and a second feed source is set 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.

[0025] Each second feed source is rotated 45 degrees relative to the position of the first feed source, and each second feed source and the patches around it form a second antenna unit. Each second feed source is hollowed out at the position corresponding to the patches around it and is not connected to the patches around it.

[0026] In order to better understand the broadband quadruple-polarized low-profile magneto-electric dipole antenna array proposed in the present invention, refer to Figure 1 The structural schematic diagram shown takes a 4×4 antenna array structure as an example. Figure 1The left side of the horizontal line is the overall schematic diagram, and the right side of the horizontal line is the top view. Take a first antenna unit in the upper left corner as an example: the feed source 10 of the first first antenna unit, the center position of the four patches of the first first antenna unit: the patch A101 of the first first antenna unit, the patch B102 of the first first antenna unit, the patch C103 of the first first antenna unit, and the patch D104 of the first first antenna unit, and the feed source 10 of the first first antenna unit is not connected to the four patches: the patch A101 of the first first antenna unit, the patch C103 of the first first antenna unit, and the patch D104 of the first first antenna unit.

[0027] The intersection between the row where the first first antenna unit is located and the row where the adjacent second first antenna unit (formed by the feed source 20 of the second first antenna unit, the four patches of the second first antenna unit: patch A201 of the second first antenna unit, patch B 202 of the second first antenna unit, patch C 203 of the second first antenna unit, and patch D204 of the second first antenna unit) 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 source 30 of the third first antenna unit, 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, and patch D304 of the third first antenna unit) is a target position, and the target position is provided with a feed source, namely the feed source 50 of the second antenna unit, and the feed source 50 of the second antenna unit is relative to the feed source 10 of the first first antenna unit and the feed source 11 of the second first antenna unit. The feed source 20 of the antenna unit, the feed source 30 of the third first antenna unit, and the feed source 40 of the fourth first antenna unit are all set at 45 degrees, and they form a 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 source 50 of the second antenna unit passes through 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. The positions are hollowed out and are not connected to the surrounding patches. That is, the second antenna unit is centered on the feed source 50 of the second antenna unit, and the four first antenna units each have a patch, namely: 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 scattered around.

[0028] 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 is understandable that other shapes are also possible: for example, circular, elliptical, irregular polygonal, etc. However, the antenna array formed by such shapes may occupy a larger volume than the antenna array formed by square or rectangular patches. The specific shape to be selected can be determined according to actual needs.

[0029] As for the first antenna unit and the second antenna unit, both can be manufactured on a single-layer substrate instead of a multi-layer substrate, which greatly reduces the cross-section of the antenna array.

[0030] In order to better understand the first antenna unit, refer to a schematic diagram of the structure of a preferred first antenna unit shown in Figure 2 (a). In Figure 2 (a), the feed source 10 of the first first antenna unit and four patches: patch A101 of the first first antenna unit, patch B102 of the first first antenna unit, patch C103 of the first first antenna unit, and patch D104 of the first first antenna unit are arranged on the top surface of the single-layer substrate, and the upper surfaces of the two are flush, as shown in an exemplary side view schematic diagram of a preferred first antenna unit shown in Figure 2 (d).

[0031] In the first antenna unit, referring to a schematic diagram of a top view structure of a preferred first antenna unit as shown in Figure 2 (c), four patches: patch A101 of the first first antenna unit, patch B102 of the first first antenna unit, patch C103 of the first first antenna unit, and patch D104 of the first first antenna unit are symmetrically arranged around the feed source 10 of the first first antenna unit, and any patch is close to the target angle of the first feed source, for example: the target angle E of the patch A101 of the first first antenna unit exemplarily identified in Figure 2 (c) is located on the side of the dipole arm.

[0032] The diagonal angle of the target angle in each patch, for example, the diagonal angle F of the target angle of the patch B102 of the first first antenna unit exemplarily identified in FIG2 (c), is provided with an extension structure, which is a 90-degree bent vertical metal plate, for example, the extension structure 105 of the diagonal angle F of the target angle of the patch B102 of the first first antenna unit exemplarily identified in FIG2 (c), which is perpendicular to the patch, for example, the extension structure 105 of the diagonal angle F in FIG2 (c): the 90-degree bent vertical metal plate is perpendicular to the patch B102 of the first first antenna unit and faces the bottom surface of the single-layer substrate. The width of the portion connected to the diagonal angle of the 90-degree bent vertical metal plate is less than the preset length, which means: less than one-fifth of the total length of the target side, and the so-called target side is the two sides forming the diagonal angle in the patch.

[0033] Based on the above structure, among the four patches symmetrically arranged around the feed source 10 of the first first antenna unit: patch A101 of the first first antenna unit, patch B102 of the first first antenna unit, patch C103 of the first first antenna unit, and patch D104 of the first first antenna unit, two crossed patches form a pair of electric dipoles; that is, patch A101 of the first first antenna unit and patch D104 of the first first antenna unit form a pair of electric dipoles; patch B102 of the first first antenna unit and patch C103 of the first first antenna unit form another pair of electric dipoles.

[0034] The extended structure of the patch 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 respectively form a pair of magnetic dipoles together with the bottom surface and the upper surface of the single-layer substrate, and the extended structures corresponding to the patch B102 of the first first antenna unit and the patch C103 of the first first antenna unit respectively form a pair of magnetic dipoles together with the bottom surface and the upper surface of the single-layer substrate. Among them, the bottom surface and the upper surface of the single-layer substrate are metal base surfaces.

[0035] For the first feed and the second feed, the structures of the two are exactly the same, both of which include two pairs of crossed dipole arms, a central pad and a coaxial feed line, as shown in FIG2 (b) , a schematic diagram of a preferred dipole arm structure of the first antenna unit: in the two pairs of crossed dipole arms: 106 and 107 are a pair of dipole arms, 108 and 109 are another 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 FIG2 (b), one pair of dipole arms 106 and 107 in the two pairs of crossed dipole arms are connected to the central pad 110 through diodes D1 and D3 respectively; another pair of dipole arms 108 and 109 in the two pairs of crossed dipole arms are connected to the central pad 110 through diodes D2 and D4 respectively. Each dipole arm is bent at one end away from the central pad. The coaxial feed line 111 is connected to the center position of the lower surface of the central pad 110.

[0036] The second antenna unit has two differences compared to the first antenna unit. First, the second feed is rotated 45 degrees relative to the first feed. Second, due to the change in the position of the second feed, if the upper surface of the second feed is flush with the upper surface of the patch, there will be an overlapping area between the dipole arm and the surrounding patches, affecting the polarization of the antenna. In order to overcome this problem, the position where the second feed passes through the surrounding patches is hollowed out and is not connected to the surrounding patches. There is a preset gap between the lower surface of the second feed and the upper surface of the patch.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] In summary, the broadband quadruple-polarized low-profile magnetoelectric dipole antenna array suitable for 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 source of each first antenna unit is arranged at its center 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 source is arranged at each target position, which is the position where the first antenna units of adjacent rows intersect with the first antenna units of adjacent columns.

[0041] Each second feed source is rotated 45 degrees relative to the position of the first feed source, and each second feed source and the patches around it form a second antenna unit. Each second feed source is hollowed out at the position corresponding to the patches around it and is not connected to the patches around it.

[0042] The broadband quadruple-polarized low-profile magnetoelectric dipole antenna array proposed in the present invention realizes polarization reconstruction on a feed source, and the antenna array formed realizes quadruple polarization. The four dipole arms of all feed sources are bent, which can better realize impedance matching compared with the traditional cross dipole. In addition, the distance between each feed source and the adjacent feed source is large, and no additional copper layer is required to avoid direct contact between two adjacent feed sources. Therefore, all feeding probes can be designed on the same copper layer (that is, on a single-layer substrate), thereby reducing the number of substrate layers and simplifying the structure. And the distance between the feeding probes that realize two different dual polarizations is increased, making it more practical to realize a quadruple-polarized feeding network in a single layer, which greatly saves the occupied space compared with the traditional magnetoelectric dipole antenna array. And by controlling the bias voltage of the four diodes, a quadruple-polarized antenna array is realized, which better reduces the multipath fading effect and polarization mismatch at high frequencies, and has broad application prospects and high practicality.

[0043] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0044] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0045] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection 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 of the first antenna units is arranged at the center thereof and is not connected to the surrounding patches; The plurality of first antenna units are arranged in an n×n matrix, and a second feed source is arranged at each target position, the target position being a position where adjacent rows of first antenna units intersect adjacent columns of first antenna units; 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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