Metasurface loaded phased array antenna unit and antenna array

Abstract

The embodiment of the invention provides a metasurface-loaded phased-array antenna unit and an antenna array. The metasurface-loaded phased-array antenna unit comprises a driving layer, a radiation layer and a covering layer which are stacked in sequence, the driving layer comprises a first dielectric layer and a driving patch, and the driving patch is printed on the first dielectric layer; the radiation layer comprises a second dielectric layer and a radiation patch, and the radiation patch is printed on the second dielectric layer; the covering layer comprises a third dielectric layer and a plurality of covering patches arranged in an array, the covering patches are printed on the third dielectric layer and comprise opening structures, and the third dielectric layer is exposed at the positions of the opening structures of the covering patches. The efficiency of electromagnetic waves radiated by the covering layer is improved, mutual coupling between two adjacent antenna units is reduced, on one hand, high-gain radiation of the antenna units is improved, and on the other hand, mutual coupling between two adjacent antenna units is reduced.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology and related technical fields, and in particular to a phased array antenna unit and an antenna array suitable for supersurface loading. Background Art

[0002] With the development of wireless communication technology, the demand for antennas with large scanning angle range, high gain, small size and light weight is gradually increasing.

[0003] In the prior art, the antenna beam scanning angle range determines the application field of the antenna, and its scanning angle is mainly affected by three factors: the antenna unit spacing, the beam width of the unit pattern, and the active impedance matching. At present, it can meet the situation where the gain drops to 3dB in the scanning range, and the scanning angle range does not exceed 60° off-axis. In order to achieve large-angle scanning, the use of antenna units with small unit spacing and wide beam width can achieve a certain degree of improvement in the scanning angle, and its scanning angle is also around 65° off-axis. However, the design of the existing antenna will lead to stronger mutual coupling between antenna units, affecting the active standing wave of the antenna unit pattern during scanning, resulting in a decrease in scanning performance. Summary of the invention

[0004] The embodiments described in this article provide a metasurface-loaded phased array antenna unit and an antenna array, which reduce the mutual coupling between two adjacent antenna units while improving the gain of the antenna unit.

[0005] In a first aspect, according to the present disclosure, a metasurface-loaded phased array antenna unit is provided, comprising: a driving layer, a radiation layer, and a covering layer stacked in sequence;

[0006] The driving layer includes a first dielectric layer and a driving patch, and the driving patch is printed on the first dielectric layer;

[0007] The radiation layer includes a second dielectric layer and a radiation patch, and the radiation patch is printed on the second dielectric layer;

[0008] The covering layer includes a third dielectric layer and a plurality of covering patches arranged in an array, wherein the covering patches are printed on the third dielectric layer, and the covering patches include an opening structure, and the third dielectric layer is exposed at the position of the opening structure of the covering patches.

[0009] In some embodiments of the present disclosure, the radiation patch includes a slot structure, and the slot structure is symmetrically distributed along the central axis of the radiation patch.

[0010] In some embodiments of the present disclosure, the gap structure includes four sub-gap structures.

[0011] In some embodiments of the present disclosure, the sub-slot structure is an L-shaped structure, and the opening of the sub-slot structure faces the center point of the radiation patch.

[0012] In some embodiments of the present disclosure, the shape of the cover patch includes a circle and a regular polygon.

[0013] In some embodiments of the present disclosure, the shape of the opening structure is the same as the shape of the cover patch.

[0014] In some embodiments of the present disclosure, a vertical projection of the radiation patch on the first dielectric layer overlaps with a vertical projection of the driving patch on the first dielectric layer.

[0015] In some embodiments of the present disclosure, the frequency of the electromagnetic wave signal radiated by the antenna unit is related to the radius of the driving patch, the radiation patch and the cover patch.

[0016] In a second aspect, according to the present disclosure, there is provided an antenna array, the antenna array comprising a plurality of antenna units according to any one of the first aspects;

[0017] The plurality of antenna units are arranged in a preset manner to form an antenna array.

[0018] In some embodiments of the present disclosure, the phase difference between the feed signals received by any two adjacent antenna units in the antenna array is 180 degrees.

[0019] The metasurface-loaded phased array antenna unit and antenna array provided by the embodiments of the present disclosure include a driving layer, a radiation layer and a covering layer stacked in sequence; the driving layer includes a first dielectric layer and a driving patch, and the driving patch is printed on the first dielectric layer; the radiation layer includes a second dielectric layer and a radiation patch, and the radiation patch is printed on the second dielectric layer; the covering layer includes a third dielectric layer and a plurality of covering patches arranged in an array, the covering patch is printed on the third dielectric layer, and the covering patch includes an opening structure, and the third dielectric layer is exposed at the position of the opening structure of the covering patch. By setting the antenna unit to include a driving layer, a radiation layer and a covering layer, wherein the covering layer includes a third dielectric layer and a plurality of covering patches arranged in an array, the covering patch is printed on the third dielectric layer, the covering patch includes an opening structure, and the third dielectric layer is exposed at the position of the opening structure of the covering patch, and the covering patch includes an opening structure, the transmittance of the electromagnetic waves radiated by the radiation layer through the covering layer can be improved, thereby improving the efficiency of the electromagnetic waves radiated by the covering layer. In addition, due to the opening structure set in the covering patch, the radiation direction of the electromagnetic waves radiated by the radiation layer will change after passing through the covering layer, so that the electromagnetic waves radiated by the radiation layer have a certain gathering effect after passing through the covering layer, thereby reducing the mutual coupling between two adjacent antenna units. On the one hand, it improves the high-gain radiation of the antenna unit, and on the other hand, it reduces the mutual coupling between two adjacent antenna units.

[0020] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below. It should be noted that the drawings described below only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure, wherein:

[0022] Figure 1 is a schematic diagram of a top-down structure of a metasurface-loaded phased array antenna unit provided by an embodiment of the present disclosure;

[0023] Figure 2 is a schematic diagram of a top-down structure of different layers in a metasurface-loaded phased array antenna unit provided by an embodiment of the present disclosure;

[0024] Figure 3 is a schematic diagram of a top-down structure of different layers in another metasurface-loaded phased array antenna unit provided by an embodiment of the present disclosure;

[0025] Figure 4 It is a schematic diagram of the top view structure of an antenna array provided in an embodiment of the present disclosure.

[0026] In the drawings, reference numerals with the same last two digits correspond to the same elements. It should be noted that the elements in the drawings are schematic and not drawn to scale. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative work also fall within the scope of protection of the present disclosure.

[0028] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by a person skilled in the art to which the subject matter of the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the specification and the relevant art, and will not be interpreted in an idealized or overly formal form unless otherwise explicitly defined herein. As used herein, a statement that two or more parts are "connected" or "coupled" together shall mean that the parts are joined together directly or through one or more intermediate components.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0031] Furthermore, in all embodiments of the present disclosure, terms such as “first” and “second” are used only to distinguish one component (or a part of a component) from another component (or another part of a component).

[0032] In the description of the present application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two).

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0034] Based on the problems existing in the antenna unit in the prior art, the embodiment of the present disclosure provides a metasurface loaded phased array antenna unit. Figure 1 is a schematic diagram of a top view structure of a metasurface-loaded phased array antenna unit provided in an embodiment of the present disclosure, Figure 2 is a schematic diagram of a top view structure of different layers in a metasurface loaded phased array antenna unit provided by an embodiment of the present disclosure, combined with Figure 1 and Figure 2The metasurface-loaded phased array antenna unit includes: a driving layer M1, a radiation layer M2 and a covering layer M3 which are stacked in sequence; the driving layer M1 includes a first dielectric layer 10 and a driving patch 11, and the driving patch 11 is printed on the first dielectric layer 10; the radiation layer M2 includes a second dielectric layer 20 and a radiation patch 21, and the radiation patch 21 is printed on the second dielectric layer 20; the covering layer M3 includes a third dielectric layer 30 and a plurality of array-arranged covering patches 31, and the covering patches 31 are printed on the third dielectric layer 30, and the covering patches 31 include an opening structure 32, and the third dielectric layer 30 is exposed at the position of the opening structure 32 of the covering patch 31.

[0035] Specifically, the metasurface-loaded phased array antenna unit includes a driving layer M1, a radiation layer M2, and a covering layer M3 stacked in sequence, wherein the driving layer M1 is an important component of the antenna unit, which is used to generate a high-frequency current and transmit it to the radiation layer M2. The driving layer M1 is equivalent to an oscillator and a filter. The shape and size of the driving patch 11 in the driving layer M1 can be designed according to the specific frequency and wavelength of the antenna unit. The radiation layer M2 is the core component of the antenna unit, which is used to receive the high-frequency current generated by the driving layer M1 and radiate electromagnetic waves. The shape and size of the radiation patch 21 in the radiation layer M2 can be designed according to the specific frequency and wavelength of the antenna unit.

[0036] Specifically, the driving layer M1 includes a first dielectric layer 10 and a driving patch 11. The driving patch 11 is printed on the first dielectric layer 10. The first dielectric layer 10 separates the driving patch 11 from the ground layer. The high-frequency current generated by the driving layer M1 is transmitted to the radiation layer M2 through the driving patch 11. The radiation layer M2 includes a second dielectric layer 20 and a radiation patch 21. The radiation patch 21 forms a radiation array in a preset manner, couples the received high-frequency current into electromagnetic waves, and radiates to the cover layer M3 through the radiation array.

[0037] The metasurface-loaded phased array antenna unit provided in the embodiment of the present disclosure provides a covering layer M3 on the side of the radiation layer of the antenna unit away from the driving layer, so that the direction of the electromagnetic waves radiated by the radiation layer M2 is changed by the covering layer M3, thereby reducing the mutual coupling between two adjacent antenna units and realizing high-gain radiation of the antenna unit.

[0038] In a specific embodiment, Figure 2 As shown, the covering layer M3 includes a third dielectric layer 30 and a plurality of covering patches 31 arranged in an array. The covering patches 31 are printed on the third dielectric layer 30 . The covering patches 31 include an opening structure 32 . The third dielectric layer 30 is exposed at the position of the opening structure 32 of the covering patches 31 .

[0039] By setting the covering layer M3 to include the covering patches 31 arranged in an array, the opening structure 32 included in the covering patch 31 can improve the transmittance of the electromagnetic waves radiated by the radiation layer M2 through the covering layer M3, thereby improving the efficiency of the electromagnetic waves radiated by the covering layer M3. In addition, due to the opening structure 32 set in the covering patch 31, the electromagnetic waves radiated by the radiation layer M2 will change their radiation direction after passing through the covering layer M3, so that the electromagnetic waves radiated by the radiation layer M2 have a certain gathering effect after passing through the covering layer M3, reducing the mutual coupling between the two adjacent antenna units, that is, the covering layer set in the antenna unit improves the gain of the antenna unit on the one hand, and reduces the mutual coupling between the two adjacent antenna units on the other hand.

[0040] Specifically, the cover patch 31 is disposed on the third dielectric layer 30, and the cover patch 31 is designed in an array arrangement manner, and the array-arranged cover patch 31 forms a high-efficiency, high-transmittance metasurface unit. In addition, the high-efficiency, high-transmittance metasurface unit formed by the array-arranged cover patch 31 has frequency selectivity and can perform certain filtering operations.

[0041] It should be noted that in the above embodiment, the first dielectric layer 10, the second dielectric layer 20 and the third dielectric layer 30 are made of dielectric materials, and the thickness of each dielectric layer can be set according to actual usage, which is not limited in the embodiment of the present invention.

[0042] Furthermore, in the above embodiments, the first dielectric layer 10, the second dielectric layer 20 and the third dielectric layer 30 are generally set to the same size. The first dielectric layer 10, the second dielectric layer 20 and the third dielectric layer 30 of the same size can reduce the overall size of the antenna unit. In other possible implementations, the first dielectric layer 10, the second dielectric layer 20 and the third dielectric layer 30 can also be set to different sizes, which is not specifically limited in the embodiments of the present disclosure.

[0043] The metasurface-loaded phased array antenna unit provided in the embodiment of the present disclosure includes a driving layer, a radiation layer and a covering layer by setting the antenna unit, wherein the covering layer includes a third dielectric layer and a plurality of covering patches arranged in an array, the covering patch is printed on the third dielectric layer, the covering patch includes an opening structure, and the third dielectric layer is exposed at the position of the opening structure of the covering patch. The covering patch includes an opening structure that can improve the transmittance of the electromagnetic waves radiated by the radiation layer through the covering layer, thereby improving the efficiency of the electromagnetic waves radiated by the covering layer. In addition, due to the opening structure set in the covering patch, the electromagnetic waves radiated by the radiation layer will change their radiation direction after passing through the covering layer, so that the electromagnetic waves radiated by the radiation layer have a certain gathering effect after passing through the covering layer, thereby reducing the mutual coupling between two adjacent antenna units, which on the one hand improves the high-gain radiation of the antenna unit, and on the other hand reduces the mutual coupling between two adjacent antenna units.

[0044] As a feasible approach, Figure 3 is a schematic diagram of a top view structure of different layers in another metasurface-loaded phased array antenna unit provided by an embodiment of the present disclosure, such as Figure 3 As shown, the radiation patch M2 includes a slot structure 22 , and the slot structure 22 is symmetrically distributed along the central axis of the radiation patch M2 .

[0045] In a specific embodiment, the radiation patch M2 includes a slot structure 22, and the slot structure 22 is symmetrically distributed along the central axis of the radiation patch M2. The slot structure 22 increases the path length of the high-frequency current in the radiation patch M2. The increase in the path length of the high-frequency current in the radiation patch increases the frequency of the electromagnetic waves radiated by the radiation layer. Therefore, when electromagnetic waves in a fixed frequency range are required, the slot structure is set in the radiation patch to achieve miniaturization of the antenna.

[0046] In addition, the gap structure set in the radiation patch will introduce a new frequency and then introduce a new resonant frequency. When the introduced new frequency and the original frequency of the radiation patch are two adjacent frequency bands, the introduced new resonant frequency will be a continuous resonant frequency with the original resonant frequency of the radiation patch, thereby widening the bandwidth of the antenna unit.

[0047] Continue to see Figure 3 As a specific implementation, the slot structure 22 includes four sub-slot structures.

[0048] Specifically, the sub-slot structure is an L-shaped structure, and the opening of the sub-slot structure faces the center point of the radiation patch.

[0049] As a specific implementation method, Figure 3 As shown, the slot structure includes four sub-slot structures, the sub-slot structures are L-shaped structures, and the sub-slot structures are symmetrically distributed along the central axis of the radiation patch.

[0050] The central axis of the radiation patch includes a central axis along the X direction and a central axis along the Y direction, and the central axis of the radiation patch passes through the central point of the radiation patch.

[0051] By using four L-shaped slots to increase the path of the current on the surface of the radiation patch, the antenna unit can be miniaturized. In addition, the slot structure on the radiation patch will introduce new resonant frequencies and broaden the bandwidth of the antenna unit.

[0052] In a specific implementation process, the second dielectric layer 20 is exposed at the position of the gap structure 22 of the radiation patch M2.

[0053] It should be noted that, in the above embodiment, the exemplary slot structure 22 includes four sub-slot structures, and the sub-slot structure is an L-shaped structure. In other possible implementation modes, the number of slot structures included in the radiation patch can be multiple, and the shape of the sub-slot structure can be other structures. As long as the slot structures on the radiation patch are symmetrically distributed along the central axis of the radiation patch, the embodiments of the present disclosure do not specifically limit this.

[0054] Based on the above embodiments, continue to refer to Figure 2 , the shape of the covering patch 31 includes a circle or a regular polygon.

[0055] The shape of the opening structure 32 is the same as that of the cover patch 31 .

[0056] As a specific implementation method, the covering patches formed on the third dielectric layer are arranged in an array, and the covering patches arranged in an array are the top layer of the antenna unit. The covering patches arranged in an array can be understood as a layer of supersurface covering layer. Exemplarily, the supersurface covering layer is composed of 4*4 circular rings, which can achieve high-efficiency radiation within the frequency band required by the antenna unit, and at the same time reduce the mutual coupling between the two antenna units.

[0057] It should be noted that in the above embodiment, the cover patch is exemplified as being circular and the opening structure formed on the cover patch is also circular. In other possible implementations, the cover patch may be square and the opening structure formed on the cover patch is also square; or the cover patch may be rectangular and the opening structure formed on the cover patch is rectangular. This functional embodiment does not limit the specific shape of the cover patches arranged in an array, as long as the opening structure formed on the cover patch is the same shape as the cover patch.

[0058] also, Figure 2 In the figure, it is exemplified that the cover patches formed on the third dielectric layer are arranged in a 4*4 array. The cover patches may also be arranged in other ways. The arrangement of the cover patches is related to the shape of the third dielectric layer, and the embodiments of the present disclosure do not specifically limit this.

[0059] On the basis of the above embodiment, the frequency of the electromagnetic wave signal radiated by the antenna unit is related to the radius of the driving patch, the radiation patch and the covering patch.

[0060] By changing the radius of the driving patch, the radiating patch and the covering patch, the frequency of the electromagnetic wave signal radiated by the antenna unit can be changed.

[0061] In addition, in the above embodiments, the shapes of the driving patch and the radiation patch are exemplified as circular. In other possible implementations, the shapes of the driving patch and the radiation patch may also be other shapes, which is not specifically limited in the embodiments of the present disclosure.

[0062] Based on the above embodiments, the present disclosure further provides an antenna array. Figure 4 is a schematic diagram of the structure of the antenna array provided by the embodiment of the present disclosure, such as Figure 4 As shown, the antenna array includes multiple antenna units described in any one of the above embodiments; the multiple antenna units are arranged in a preset manner to form an antenna array.

[0063] The phase difference between the feed signals received by any two adjacent antenna units in the antenna array is 180 degrees.

[0064] When completing the design of the phased array, a cross-mirror array is used, such as Figure 4 As shown, the phases of the feed signals received by antenna unit 1 and antenna unit 2 are mirrored in the Y direction, and the phases of the feed signals received by antenna unit 3 and antenna unit 4 are mirrored in the Y direction, wherein the phases of the feed signals provided by two adjacent antenna units are provided in a manner of 0° and 180° arrangement, i.e., the feed phase of antenna unit 1 is 0°, and the feed phase of antenna unit 2 is 180°.

[0065] When the phase difference between the feeding signals received by two adjacent antenna units is 180 degrees, the directions of the high-frequency currents generated by the driving layers of the two adjacent antenna units are opposite, thereby weakening the coupling of the electromagnetic waves generated by the two connected antenna units in the radiation layer and reducing the mutual coupling effect between the antenna units.

[0066] The antenna array provided in the embodiments of the present application can be applied to wireless communication equipment.

[0067] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0068] Each functional unit or module in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0069] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program code.

[0070] Unless the context clearly indicates otherwise, the singular form of the words used herein and in the appended claims includes the plural and vice versa. Thus, when referring to the singular, the plural form of the corresponding term is generally included. Similarly, the words "comprise" and "include" are to be interpreted as inclusive rather than exclusive. Likewise, the terms "include" and "or" should be interpreted as inclusive unless such interpretation is expressly prohibited herein. Where the term "example" is used herein, particularly when it is located after a group of terms, the "example" is merely exemplary and illustrative and should not be considered exclusive or comprehensive.

[0071] Further aspects and scopes of adaptability become apparent from the description provided herein. It should be understood that various aspects of the present application can be implemented individually or in combination with one or more other aspects. It should also be understood that the description and specific embodiments herein are intended for purposes of illustration only and are not intended to limit the scope of the present application.

[0072] Several embodiments of the present disclosure are described in detail above, but it is obvious that those skilled in the art can make various modifications and variations to the embodiments of the present disclosure without departing from the spirit and scope of the present disclosure. The protection scope of the present disclosure is defined by the attached claims.

Claims

1. A metasurface-loaded phased array antenna unit, characterized in that: include: A driving layer, a radiation layer and a covering layer are stacked in sequence; The driving layer includes a first dielectric layer and a driving patch, and the driving patch is printed on the first dielectric layer; The radiation layer includes a second dielectric layer and a radiation patch, and the radiation patch is printed on the second dielectric layer; The covering layer includes a third dielectric layer and a plurality of covering patches arranged in an array, wherein the covering patches are printed on the third dielectric layer, and the covering patches include an opening structure, and the third dielectric layer is exposed at the position of the opening structure of the covering patches.

2. The antenna unit according to claim 1, characterized in that The radiation patch includes a slot structure, and the slot structure is symmetrically distributed along the central axis of the radiation patch.

3. The antenna unit according to claim 2, characterized in that The slot structure includes four sub-slot structures.

4. The antenna unit according to claim 3, characterized in that The sub-slot structure is an L-shaped structure, and the opening of the sub-slot structure faces the center point of the radiation patch.

5. The antenna unit according to claim 1, characterized in that The shapes of the cover patch include a circle and a regular polygon.

6. The antenna unit according to claim 1, characterized in that The shape of the opening structure is the same as that of the cover patch.

7. The antenna unit according to claim 1, characterized in that A vertical projection of the radiation patch on the first dielectric layer overlaps with a vertical projection of the driving patch on the first dielectric layer.

8. The antenna unit according to claim 1, characterized in that The frequency of the electromagnetic wave signal radiated by the antenna unit is related to the radius of the driving patch, the radiation patch and the covering patch.

9. An antenna array, characterized in that: The antenna array comprises a plurality of antenna units according to any one of claims 1 to 8; The plurality of antenna units are arranged in a preset manner to form an antenna array.

10. The antenna array according to claim 9, characterized in that: The phase difference between the feed signals received by any two adjacent antenna units in the antenna array is 180 degrees.

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