Array antenna device, preparation method thereof, and electronic device

Abstract

The present invention relates to the field of communication technologies, and particularly relates to an array antenna device, a preparation method thereof, and an electronic device. The array antenna device includes: at least two substrates arranged from top to bottom: a first substrate and a second substrate; a first antenna is disposed on the first substrate; a second antenna is disposed on the second substrate; the first antenna is provided with a plurality of arrayed elements, and the second antenna is provided with a plurality of arrayed elements; wherein the projections of all the elements of the first antenna and all the elements of the second antenna on the second substrate do not completely overlap. The present invention has the advantages of low sidelobe, large bandwidth, and multiple beams, etc.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and particularly to an array antenna device, a preparation method thereof, and an electronic device using the array antenna device for communication. Background Art

[0002] With the development of modern wireless communication technologies, antennas play a very important role in mobile communication devices. With the advent of the fifth-generation mobile communication technology era (5G era), to meet the high-speed information transmission requirements of the 5G era, it is necessary to form an array antenna by arraying multiple antenna units to increase its gain, and to increase the information transmission capacity through multiple antennas. However, in the prior art, as an array antenna applied to terminal devices and base stations, a single and fixed antenna array structure is usually adopted, and there will be sidelobe levels during the working process, which will cause the signal-to-noise ratio of the signal to decrease. And the single and fixed antenna array structure results in a limited working frequency bandwidth and a single beam direction of the antenna, which limits the working accuracy, working frequency band and working range of the antenna. Therefore, in antenna development, it is particularly important to develop an antenna with advantages such as low sidelobes, large bandwidth, and multiple beams in the field of communication technologies, and it is also particularly necessary to meet the communication requirements of the 5G era. Summary of the Invention

[0003] Embodiments of the present invention provide an array antenna device, a preparation method thereof, and an electronic device, which overcome the technical problems of fixed beams, narrow beam widths, and limited bandwidths existing in the traditional planar antenna array method, and have the advantages of low sidelobes, large bandwidth, and multiple beams while ensuring the resolution.

[0004] On the one hand, to achieve the above advantages, the present invention provides an array antenna device, including:

[0005] There are at least two substrates arranged from top to bottom: a first substrate and a second substrate;

[0006] A first antenna is disposed on the first substrate;

[0007] A second antenna is disposed on the second substrate;

[0008] The first antenna is provided with a plurality of arrayed elements, and the second antenna is provided with a plurality of arrayed elements;

[0009] Wherein, the projections of all the elements of the first antenna and all the elements of the second antenna on the second substrate do not completely overlap.

[0010] Preferably, all the array elements of the first antenna are symmetrically distributed with respect to the geometric center of the first substrate, all the array elements of the second antenna are symmetrically distributed with respect to the geometric center of the second substrate, and the projection of the geometric center of the first substrate on the second substrate coincides with the geometric center of the second substrate.

[0011] Preferably, the sizes of the array elements of the first antenna are different from those of the array elements of the second antenna.

[0012] Preferably, all the array elements of the first antenna are not symmetrically distributed with respect to the geometric center of the first substrate, all the array elements of the second antenna are not symmetrically distributed with respect to the geometric center of the second substrate, and the projection of the geometric center of the first substrate on the second substrate coincides with the geometric center of the second substrate.

[0013] Preferably, the distances between any two adjacent array elements of each row of the first antenna in a second direction perpendicular to the first direction from top to bottom are not equal, and the distances between any two adjacent array elements of each row of the second antenna in the second direction are not equal.

[0014] Preferably, all the array elements of the first antenna have the same size, all the array elements of the second antenna have the same size, and the sizes of the array elements of the first antenna are different from those of the array elements of the second antenna.

[0015] Preferably, the distances between adjacent array elements of all the array elements of the first antenna in the transverse and / or longitudinal directions of the first substrate gradually increase as the distance from the geometric center of the first substrate increases, and the distances between adjacent array elements of all the array elements of the second antenna in the transverse and / or longitudinal directions of the second substrate gradually increase or gradually decrease as the distance from the geometric center of the second substrate increases.

[0016] Preferably, the distances between adjacent array elements of all the array elements of the first antenna in the transverse and / or longitudinal directions of the first substrate gradually decrease as the distance from the geometric center of the first substrate increases, and the distances between adjacent array elements of all the array elements of the second antenna in the transverse and longitudinal directions of the second substrate gradually increase or gradually decrease as the distance from the geometric center of the second substrate increases.

[0017] Preferably, the widths of the array elements of the first antenna gradually increase or gradually decrease as the distance from the geometric center of the first substrate increases, the widths of the array elements of the second antenna gradually increase or gradually decrease as the distance from the geometric center of the second substrate increases, and the lengths of the array elements of the first antenna are a first preset value, and the lengths of the array elements of the second antenna are a second preset value different from the first preset value.

[0018] Preferably, the distance between the geometric centers of any two adjacent elements of the first antenna is a first specified value; the distance between the geometric centers of any two adjacent elements of the second antenna is a second specified value different from the first specified value.

[0019] On the other hand, an embodiment of the present invention further provides a method for manufacturing an array antenna device, the manufacturing method including:

[0020] Form a first antenna on a first substrate, the first antenna being provided with a plurality of elements arranged in an array;

[0021] Form a second antenna on a second substrate, the second antenna being provided with a plurality of elements arranged in an array;

[0022] Place the first substrate above the second substrate;

[0023] Wherein, the projections of all the elements of the first antenna and all the elements of the second antenna on the second substrate do not completely coincide.

[0024] On yet another aspect, an embodiment of the present invention further provides an electronic device, the electronic device including the array antenna device described in any one of the foregoing.

[0025] The array antenna device, its manufacturing method and the electronic device of the present invention have the following beneficial effects:

[0026] 1) Sidelobe suppression: Reduce the energy distribution of the upper sidelobe, so as to reduce the co-frequency, adjacent-frequency, and out-of-area interference caused by the excessive upper sidelobe, etc., and achieve an optimized null cancellation effect, thereby realizing an ideal sidelobe suppression;

[0027] 2) Wide bandwidth or multi-channel: Have a high information rate, have a wide spectrum spreading ability, reduce multipath and clutter and enhance the anti-interference ability; In wireless communication with adjacent frequencies, it is easy to overcome mutual interference; Greatly improve the communication volume;

[0028] 3) Multi-beam: Form shaped beams of different shapes, the number and shape of the beams can be flexibly set, the element beams are narrow and have high gain, multiple users can be served simultaneously, the synthesized beam can cover a specified wide area range, and a low sidelobe can be achieved in a combined feed way. Description of the Drawings

[0029] Figure 1 is a three-dimensional structural schematic diagram of an array antenna device in Embodiment 1 of the present invention;

[0030] Figure 2 is Figure 1 a structural schematic diagram of the array antenna device in a perspective view from a top-down perspective;

[0031] Figure 3Yes Figure 2 Structural schematic diagram of the A-A' cross-section in

[0032] Figure 4 Yes Figure 2 Structural schematic diagram of the B-B' cross-section in

[0033] Figure 5 Structural schematic diagram of an array antenna device in Embodiment 2 of the present invention;

[0034] Figure 6 Structural schematic diagram of an array antenna device in Embodiment 3 of the present invention;

[0035] Figure 7 Structural schematic diagram of an array antenna device in Embodiment 4 of the present invention;

[0036] Figure 8 Structural schematic diagram of an array antenna device in Embodiment 5 of the present invention;

[0037] Figure 9 Schematic diagram of the preparation method of an array antenna device in Embodiment 6 of the present invention;

[0038] Figure 10 Structural schematic diagram of an electronic device using the array antenna device of Embodiments 1 to 5 above in Embodiment 7 of the present invention.

[0039] Explanation of the reference numerals in the drawings:

[0040] 100--First substrate; 110--First antenna; O is the geometric center of the first substrate

[0041] 200--Second substrate; 210--Second antenna; O' is the geometric center of the second substrate

[0042] 300--Reflector;

[0043] 400--First connection line

[0044] 500--Second connection line

[0045] 600--Through hole

[0046] 700--Feeder

[0047] 111, 112, 113, 114--Elements of the first substrate

[0048] 211, 212, 213, 214--Elements of the second substrate

[0049] 11A, 11B, 11C, 11D, 11E, 11F, 11G, 11H--Elements of the first substrate

[0050] 21A, 21B, 21C, 21D, 21E, 21F, 21G, 21H - Array elements of the second substrate

[0051] 11a, 11b, 11c, 11d, 11e, 11f, 11g, 11h - Array elements of the first substrate

[0052] 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h - Array elements of the second substrate Specific embodiments

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should 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. In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, elements defined by the statement "comprising..." do not exclude the presence of additional identical elements in the process, method, article or device comprising the said elements. If there is no conflict, the embodiments of the present invention and the various features in the embodiments can be combined with each other, and all are within the protection scope of the present invention.

[0054] Embodiment 1

[0055] Please refer to Figures 1 to 4 , the array antenna device in Embodiment 1 of the present invention is mainly applied to high-speed communication and radar, and mainly includes:

[0056] At least two substrates are provided from top to bottom: a first substrate 100 and a second substrate 200;

[0057] A first antenna 110 is disposed on the first substrate 100;

[0058] The second antenna 210 is disposed on the second substrate 200;

[0059] The first antenna 110 is provided with a plurality of arrayed array elements, and the second antenna 210 is provided with a plurality of arrayed array elements; each of these array elements can be formed by a microstrip patch, and preferably each microstrip patch is in a rectangular shape. The array arrangement here can be achieved as follows:

[0060] The matrix of the array antenna consists of at least 2x1 array elements and can be extended to a larger scale, where the number of rows and columns of the matrix is a power of 2, such as 2x2, 2x4, 4x4, 4x8, 8x8, 8x16, 16x16, 32x32, etc. It can also be other matrix arrangement methods, such as 2x3, 2x6, 2x12, etc., which also fall within the scope of the present invention.

[0061] Among them, the projections of all the array elements of the first antenna 110 and all the array elements of the second antenna 210 on the second substrate 200 do not completely coincide. The incomplete coincidence here means that the size of the array elements of the first antenna is different from that of the second antenna, or the projections of the array elements of the first antenna and the second antenna on the second substrate do not overlap or partially overlap.

[0062] In addition, the size of the first substrate and the size of the second substrate are preferably the same, but of course they can also be different. It should be noted that the sizes (array element size, substrate size) mentioned in this article mainly refer to the length on the Y-axis (usually called the antenna length) and the width on the X-axis (usually called the antenna width) when the device (array element, substrate) is represented by a two-dimensional plane coordinate axis, without calculating the thickness of the device. The thickness of the device is the height difference between the upper surface and the lower surface of the device in the vertical direction, which is the top-down direction in the present invention.

[0063] Here, the first antenna and the second antenna can each be only a transmitting antenna, or only a receiving antenna, or each can include both a transmitting antenna and a receiving antenna. For example, when the first antenna or the second antenna includes both a transmitting antenna and a receiving antenna at the same time, the receiving antenna and the transmitting antenna on the same substrate are connected to each other through a metal wire via hole. As Figure 3 and Figure 4 shown, the array elements of the receiving antenna and the array elements of the transmitting antenna of the first antenna on the first substrate are connected through the first connection line 400, and the array elements of the receiving antenna and the array elements of the transmitting antenna of the second antenna on the second substrate are connected through the second connection line 500. The array elements of the first antenna and the array elements of the second antenna are connected to the chip (not shown) of the array antenna device through the feeding line 700 passing through the through holes 600 provided on the first substrate and the second substrate, and communication is achieved by transmitting the signal to the chip and then processing it by the chip.

[0064] In a preferred embodiment, the elements on the same substrate are connected by connecting lines, and the elements are symmetrically arranged on both sides of the connecting line (as shown in Figure 1 ). At the same time, the geometric center O of the first substrate 100 and the geometric center O' of the second substrate 200 are located on the connecting line, which is also the geometric center of the connecting line.

[0065] In addition, the number of substrates and the number of antennas provided on the substrates can be set to n, where n is greater than or equal to 2, so as to achieve multiple beams. Moreover, the projections of the elements of each layer on the specified surface of any substrate do not completely overlap with the elements of other layers, for example, they are staggered or partially overlapped. In this way, the main lobes of the elements of each layer can point in different directions. By adjusting the angles of the main lobes through the non - complete overlap of the elements, a large bandwidth can be achieved; the horizontal side - lobe levels generated by the array antennas on each substrate can also be cancelled out with each other.

[0066] If the positions of the antenna elements of two or more layers are evenly overlapped but not completely coincident, and the sizes of the elements (microstrip patches) are different, multi - channel or large - bandwidth transmission can be achieved in the same transmission / reception direction.

[0067] The length of any element of the first antenna or the second antenna is approximately equal to 0.5 times the dielectric wavelength λ. Usually, millimeter - waves are used, so the antenna size can be made very small, preferably between 0.3λ and 1.2λ.

[0068] In Figures 2 to 4 , H is the transverse spacing of the elements (microstrip patches). The number 1 refers to the first - layer antenna, and the letter n refers to the n - th layer antenna. H1 is the transverse spacing between the microstrip patches of the first - layer antenna, and Hn is the transverse spacing between the microstrip patches of the n - th layer antenna; it can be seen that the size of H1 in the figure is different from the size of Hn.

[0069] V is the longitudinal spacing of the elements (microstrip patches). The number 1 refers to the first - layer antenna, and the letter n refers to the n - th layer antenna. V1 is the longitudinal spacing between the microstrip patches of the first - layer antenna, and Vn is the longitudinal spacing between the microstrip patches of the n - th layer antenna; the size of V1 is also different from the size of Vn.

[0070] L is the width of the elements (microstrip patches). The number 1 refers to the first - layer antenna, and the letter n refers to the n - th layer antenna. L1 is the width of the microstrip patch of the first - layer antenna, and Ln is the width of the microstrip patch of the n - th layer antenna. The size of L1 is also different from the size of Ln.

[0071] After the layout according to the antenna structure disclosed in the present invention, the antenna bandwidth is increased, multiple beams are achieved, and the antenna side - lobes can be effectively adjusted and suppressed, effectively reducing the mutual coupling and interference between antennas, and improving the communication quality and radar detection efficiency.

[0072] In Embodiment 1 of the present invention, the array antenna device adopts a three-dimensional up-and-down design in space, and makes a differential design for the array elements of the array antenna on each substrate layer and the array elements of the array antenna on other substrate layers in terms of the layout position of the array elements and the spacing between adjacent array elements. This not only overcomes the technical prejudice in the prior art, that is, the prejudice of the up-and-down layer design in three-dimensional space, but also can effectively achieve the following beneficial effects:

[0073] 1) Sidelobe suppression: Reduce the energy distribution of the upper sidelobe, so as to reduce the co-frequency, adjacent-frequency, cross-zone interference, etc. caused by the excessive upper sidelobe, and achieve an optimized null cancellation effect, thereby realizing an ideal sidelobe suppression;

[0074] 2) Wide bandwidth or multi-channel: It has a high information rate, a wide spectrum spreading ability, reduces multipath and clutter, and enhances the anti-interference ability; in wireless communication at adjacent frequencies, it is easy to overcome mutual interference; significantly improves the communication volume;

[0075] 3) Multi-beam: Forms shaped beams of different shapes, can flexibly set the number and shape of the beams, the element beams are narrow and have high gain, can serve multiple users simultaneously, the synthesized beam can cover a specified wide area range, and can achieve low sidelobes in the way of combined feed sources.

[0076] Embodiment 2

[0077] Please refer to Figure 5 , on the basis of Embodiment 1 of the present invention, Embodiment 2 of the present invention further improves and refines the array antenna device. The main features are: all the array elements of the first antenna are symmetrically distributed about the geometric center of the first substrate, all the array elements of the second antenna are symmetrically distributed about the geometric center of the second substrate, and the projection of the geometric center of the first substrate on the second substrate coincides with the geometric center of the second substrate.

[0078] In a specific embodiment, the sizes of the array elements of the first antenna are different from the sizes of the array elements of the second antenna.

[0079] Specifically, all the array elements of the first antenna 110 on the first substrate 100 have the same size, the spacing between any two adjacent array elements is equal, and they are arranged in a central symmetry. All the array elements of the second antenna 210 on the second substrate 200 have the same size, the spacing between any two adjacent array elements is equal, and they are arranged in a central symmetry. The projection of the geometric center of the first substrate on the second substrate completely coincides with the geometric center of the second substrate.

[0080] The lengths of the array elements (microstrip patches) of the first antenna are different from the lengths of the array elements (microstrip patches) of the second antenna, so they generate outgoing waves of different frequencies respectively, can form multiple frequency bands, or are superimposed on each other in the frequency domain to achieve the effect of increasing the bandwidth.

[0081] Embodiment 3

[0082] Please refer to Figure 6 , on the basis of Embodiment 1 of the present invention, further improvements and refinements are made in Embodiment 3 of the present invention. The main features are as follows: all the array elements 111, 112, 113, 114 of the first antenna are not symmetrically distributed about the geometric center of the first substrate, and all the array elements 211, 212, 213, 214 of the second antenna are not symmetrically distributed about the geometric center of the second substrate. The projection of the geometric center of the first substrate on the second substrate coincides with the geometric center of the second substrate. All the array elements 111, 112, 113, 114 of the first antenna are shifted to the right by a certain distance relative to the geometric center of the first substrate, while all the array elements 211, 212, 213, 214 of the second antenna are shifted to the left by a certain distance relative to the geometric center of the second substrate. There is even no overlapping part in their projections on the second substrate.

[0083] Furthermore, the spacing between any two adjacent array elements of each row of the first antenna is not equal in the second direction perpendicular to the first direction from top to bottom. For example, the spacing between array element 112 and array element 113 is not equal to the spacing between array element 113 and array element 114. The spacing between any two adjacent array elements of each row of the second antenna is not equal in the second direction. For example, the spacing between array element 211 and array element 212 is not equal to the spacing between array element 212 and array element 213.

[0084] In this embodiment, the uneven or asymmetric arrangement of the array element spacing of the array antenna on a certain substrate layer can change the beam angle and main beam direction of the antenna on this layer. At the same time, when the positions of the array elements of the antennas on each substrate layer are unevenly or asymmetrically distributed, their projections on any specified layer do not completely coincide with the array elements of the antennas on other layers. This enables each layer to generate its own electromagnetic field phase change respectively, generating multiple outgoing beams. When these multi-layer antenna arrays are stacked, a multi-beam antenna can be realized.

[0085] Embodiment 4

[0086] Please refer to Figure 7 , on the basis of Embodiment 1 of the present invention, further improvements and refinements are made in Embodiment 4 of the present invention. The main features are as follows: all the array elements of the first antenna have the same size, all the array elements of the second antenna have the same size, and the sizes of the array elements of the first antenna are different from those of the array elements of the second antenna.

[0087] In a specific embodiment, the spacing between adjacent elements among all the elements 11A, 11B, 11C, 11D, 11E, 11F, 11G, 11H of the first antenna in the transverse and / or longitudinal directions of the first substrate gradually increases as the distance from the geometric center of the first substrate increases. The spacing between adjacent elements among all the elements 21A, 21B, 21C, 21D, 21E, 21F, 21G, 21H of the second antenna in the transverse and / or longitudinal directions of the second substrate gradually increases or gradually decreases as the distance from the geometric center of the second substrate increases.

[0088] In a specific embodiment, the spacing between adjacent elements among all the elements of the first antenna in the transverse and / or longitudinal directions of the first substrate gradually decreases as the distance from the geometric center of the first substrate increases. The spacing between adjacent elements among all the elements of the second antenna in the transverse and longitudinal directions of the second substrate gradually increases or gradually decreases as the distance from the geometric center of the second substrate increases.

[0089] Embodiment 5

[0090] Please refer to Figure 8 , based on Embodiment 1 of the present invention, further improvements and refinements are made in Embodiment 5 of the present invention. The main features are: the sizes of all the elements of the first antenna are the same, the sizes of all the elements of the second antenna are the same, and the sizes of the elements of the first antenna are different from the sizes of the elements of the second antenna.

[0091] Furthermore, the widths of the elements 11a, 11b, 11c, 11d, 11e, 11f, 11g, 11h of the first antenna gradually increase or gradually decrease as the distance from the geometric center of the first substrate increases. The widths of the elements 21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h of the second antenna gradually increase or gradually decrease as the distance from the geometric center of the second substrate increases. And the lengths of the elements of the first antenna are a first preset value, and the lengths of the elements of the second antenna are a second preset value different from the first preset value.

[0092] In a specific embodiment, the spacing between the geometric centers of any two adjacent elements of the first antenna is a first specified value; the spacing between the geometric centers of any two adjacent elements of the second antenna is a second specified value different from the first specified value. That is to say, the spacing between the geometric centers of any two adjacent elements of the first antenna remains unchanged, but the sizes of the elements are changed, and the same is true for any two adjacent elements of the second antenna.

[0093] Embodiment 6

[0094] Please refer to Figure 9, on the basis of Embodiments 1 to 5 of the present invention, Embodiment 6 further provides a method for manufacturing an array antenna device, and the manufacturing method includes:

[0095] S1. Form a first antenna on a first substrate, where the first antenna is provided with a plurality of arrayed elements;

[0096] S2. Form a second antenna on a second substrate, where the second antenna is provided with a plurality of arrayed elements;

[0097] S3. Place the first substrate above the second substrate;

[0098] Wherein, the projections of all the elements of the first antenna on the second substrate do not completely coincide with the projections of all the elements of the second antenna. For further features of the array antenna device of the present invention, please refer to the descriptions of Embodiments 1 to 5 of the present invention, which will not be elaborated herein.

[0099] Embodiment 7

[0100] Please refer to Figure 10 , on the basis of Embodiments 1 to 5 of the present invention, a further electronic device is provided, and the electronic device includes the array antenna device in Embodiments 1 to 5 above. The electronic device can be a mobile communication device, a satellite communication device or a radar device.

[0101] It should be clear that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, the detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order of steps after understanding the spirit of the present invention. All of these should be covered within the protection scope of the present invention.

Claims

1. An array antenna device, characterized in that, The array antenna device includes: At least two substrates are provided from top to bottom: a first substrate and a second substrate; A first antenna is disposed on the first substrate; A second antenna is disposed on the second substrate; The first antenna is provided with a plurality of array - arranged elements, and the second antenna is provided with a plurality of array - arranged elements; Wherein, the elements on the first antenna and the second antenna all face the same direction. The projections of all the elements of the first antenna and all the elements of the second antenna on the second substrate do not completely coincide. All the elements of the first antenna are symmetrically distributed about the geometric center of the first substrate, all the elements of the second antenna are symmetrically distributed about the geometric center of the second substrate, and the projections of the geometric center of the first substrate and the geometric center of the second substrate on the second substrate coincide.

2. The array antenna device according to claim 1, wherein The sizes of the elements of the first antenna are different from the sizes of the elements of the second antenna.

3. The array antenna device according to claim 1, characterized in that, All the elements of the first antenna are not symmetrically distributed about the geometric center of the first substrate, all the elements of the second antenna are not symmetrically distributed about the geometric center of the second substrate, and the projections of the geometric center of the first substrate and the geometric center of the second substrate on the second substrate coincide.

4. The array antenna device according to claim 3, wherein, The distances between any two adjacent elements of each row of the first antenna in a second direction perpendicular to the first direction from top to bottom are not equal, and the distances between any two adjacent elements of each row of the second antenna in the second direction are not equal.

5. The array antenna device according to claim 1, wherein, All the elements of the first antenna have the same size, all the elements of the second antenna have the same size, and the sizes of the elements of the first antenna are different from the sizes of the elements of the second antenna.

6. The array antenna device according to claim 5, characterized in that, The distances between adjacent elements of all the elements of the first antenna in the horizontal and / or vertical directions of the first substrate gradually increase as the distance from the geometric center of the first substrate increases. The distances between adjacent elements of all the elements of the second antenna in the horizontal and / or vertical directions of the second substrate gradually increase or gradually decrease as the distance from the geometric center of the second substrate increases.

7. The array antenna device according to claim 5, characterized in that, The distances between adjacent elements of all the elements of the first antenna in the horizontal and / or vertical directions of the first substrate gradually decrease as the distance from the geometric center of the first substrate increases. The distances between adjacent elements of all the elements of the second antenna in the horizontal and vertical directions of the second substrate gradually increase or gradually decrease as the distance from the geometric center of the second substrate increases.

8. The array antenna device according to claim 1, characterized in that The widths of the elements of the first antenna gradually increase or gradually decrease as the distance from the geometric center of the first substrate increases. The widths of the elements of the second antenna gradually increase or gradually decrease as the distance from the geometric center of the second substrate increases. And the lengths of the elements of the first antenna are a first preset value, and the lengths of the elements of the second antenna are a second preset value different from the first preset value.

9. The array antenna device according to claim 8, characterized in that, The distance between the geometric centers of any two adjacent elements of the first antenna is a first specified value; the distance between the geometric centers of any two adjacent elements of the second antenna is a second specified value different from the first specified value.

10. A method for preparing an array antenna device, characterized in that, The preparation method includes: forming a first antenna on a first substrate, where the first antenna is provided with a plurality of elements arranged in an array; forming a second antenna on a second substrate, where the second antenna is provided with a plurality of elements arranged in an array; placing the first substrate above the second substrate; wherein, the elements on the first antenna and the second antenna all face the same direction, the projections of all the elements of the first antenna and all the elements of the second antenna on the second substrate do not completely overlap, all the elements of the first antenna are symmetrically distributed about the geometric center of the first substrate, all the elements of the second antenna are symmetrically distributed about the geometric center of the second substrate, and the projections of the geometric center of the first substrate and the geometric center of the second substrate on the second substrate coincide.

11. An electronic device, characterized in that, The electronic device includes the array antenna device according to any one of claims 1 to 9.

Images