Low-profile 2D beam scanning array antenna

Abstract

The present invention discloses a low-profile two-dimensional beam scanning array antenna, which relates to the technical field of array antennas. The array antenna includes a resonator antenna ERA body located at the lower side, the antenna body includes a partially reflecting surface PRS, a bottom layer all-metal phase correction structure is fixed on the upper side of the partially reflecting surface PRS, a middle layer all-metal phase correction structure is fixed on the upper side of the bottom layer all-metal phase correction structure, a top layer all-metal phase correction structure is fixed on the upper side of the middle layer all-metal phase correction structure, the distance between the bottom layer all-metal phase correction structure and the partially reflecting surface PRS is λ0 / 4, and the distance between the all-metal phase correction structures is λ0 / 3. The array has the advantages of simple antenna structure, low cost, large power capacity, etc., and the antenna phase uniformity is significantly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of array antennas, and in particular to a low-profile two-dimensional beam scanning array antenna. Background Art

[0002] Array antennas with beam scanning characteristics have a wide range of applications in various fields. Existing high-gain beam scanning antennas are mainly divided into two categories: mechanical rotating parabolic antennas and electrically controlled phased array antennas. Among them, the rotating parabolic antenna has the advantages of simple structure, low cost, and high efficiency, but its appearance is a special curved surface, it is bulky, heavy, and has a slow beam scanning speed and high requirements for the servo system. The electronically scanned phased array antenna can better overcome the above shortcomings. It not only has a fast scanning speed and more flexible performance, but also a planar or conformal structure that is more conducive to maintaining conformity with the carrier. However, its feeding network design is complex, especially when the antenna aperture increases, the feeding loss is high, the antenna radiation efficiency is low, and the achievable gain is limited. Although the introduction of solid-state transceiver components in the unit can reduce the feeding loss, the cost and weight of the system will be greatly increased, which limits its large-scale application. Summary of the invention

[0003] The technical problem to be solved by the present invention is how to provide a low-profile two-dimensional beam scanning array antenna with simple structure, low cost, large power capacity and significantly improved phase uniformity.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a low-profile two-dimensional beam scanning array antenna, characterized in that: it includes a resonator antenna ERA body located on the lower side, the antenna body includes a partially reflecting surface PRS, a bottom-layer all-metal phase correction structure is fixed on the upper side of the partially reflecting surface PRS, a middle-layer all-metal phase correction structure is fixed on the upper side of the bottom-layer all-metal phase correction structure, a top-layer all-metal phase correction structure is fixed on the upper side of the middle-layer all-metal phase correction structure, the distance between the bottom-layer all-metal phase correction structure and the partially reflecting surface PRS is λ0 / 4, the distance between the bottom-layer all-metal phase correction structure and the middle-layer all-metal phase correction structure is λ0 / 3, the distance between the middle-layer all-metal phase correction structure and the top-layer all-metal phase correction structure is λ0 / 3, and λ0 is the free space wavelength at the operating frequency of the resonator antenna ERA body.

[0005] A further technical solution is that the bottom all-metal phase correction structure and the partial reflection surface PRS, the middle all-metal phase correction structure and the bottom all-metal phase correction structure, and the top all-metal phase correction structure and the middle all-metal phase correction structure are fixed together by insulating columns.

[0006] A further technical solution is that: the top-layer all-metal phase correction structure includes a plurality of first correction units, a plurality of second correction units, a plurality of disks and connecting lines; the outer ring of the top-layer all-metal phase correction structure forms a circle of first correction units connected to each other; the first correction unit includes a first square block located in the middle and first connecting lines respectively connected to the four sides of the first square block; two circles of second correction units connected to each other are formed on the inner side of the first correction unit located in the outer ring; the first correction unit is connected to the adjacent second correction unit; the second correction unit includes a second square block located in the middle and second connecting lines respectively connected to the four sides of the second square block; the area of ​​the first square block is larger than the area of ​​the second square block The first square block is connected to the first correction unit by a first connecting line, the first correction unit and the second correction unit are connected to each other by a first connecting line and a second connecting line, a circle of disks is formed on the inner side of the second correction unit located in the inner circle, the disks and the second correction unit in the inner circle are interconnected by connecting lines, the inner circle of the disks is formed with cross-shaped connecting lines, and the ends of the connecting lines located in the inner circle of the disks have free ends, so that a gap is formed at the center of the top-level all-metal phase correction structure, the supporting connecting disks are located at the four corners of the top-level all-metal phase correction structure on the outer side of the first correction unit, and the supporting connecting disks are connected to the first correction unit, and a mounting hole is formed in the center of the supporting connecting disks.

[0007] A further technical solution is that: the middle-layer all-metal phase correction structure includes a plurality of first correction units, a plurality of second correction units, a plurality of disks and connecting wires; the outer ring of the middle-layer all-metal phase correction structure is formed with three circles of second correction units connected to each other; the second correction unit includes a second square block located in the middle and second connecting wires respectively connected to the four sides of the second square block; two circles of first correction units connected to each other are formed on the inner side of the second correction unit located in the inner ring; the first correction unit is connected to the adjacent second correction unit; the first correction unit includes a first square block located in the middle and first connecting wires respectively connected to the four sides of the first square block; The area of ​​the first square block is larger than that of the second square block. The first square block is connected to the first correction unit through a first connecting line, and the first correction unit and the second correction unit are connected to each other through a first connecting line and a second connecting line. A circle of disks is formed on the inner side of the first correction unit located in the inner circle, and the disks are interconnected with the first correction unit in the inner circle through connecting lines. The inner circle of the disks is formed with cross-shaped connecting lines. The supporting connecting disks are located at the four corners of the middle-layer all-metal phase correction structure on the outer side of the second correction unit, and the supporting connecting disks are connected to the second correction unit, and a mounting hole is formed in the center of the supporting connecting disks.

[0008] A further technical solution is that: the bottom all-metal phase correction structure includes a plurality of first correction units, a plurality of second correction units, a plurality of disks and connecting wires; the outer ring of the bottom all-metal phase correction structure forms a circle of first correction units connected to each other; the first correction unit includes a first square block located in the middle and first connecting wires respectively connected to the four sides of the first square block; two circles of second correction units connected to each other are formed on the inner side of the first correction unit located in the outer ring; the first correction unit is connected to the adjacent second correction unit; the second correction unit includes a second square block located in the middle and second connecting wires respectively connected to the four sides of the second square block; The area of ​​the first square block is larger than that of the second square block. The first square block is connected to the first correction unit through a first connecting line, and the first correction unit and the second correction unit are connected to each other through a first connecting line and a second connecting line. A circle of disks is formed on the inner side of the second correction unit located in the inner circle, and the disks are interconnected with the second correction unit in the inner circle through connecting lines. The inner circle of the disks is formed with cross-shaped connecting lines. The supporting connecting disks are located at the four corners of the underlying all-metal phase correction structure on the outer side of the first correction unit, and the supporting connecting disks are connected to the first correction unit, and a mounting hole is formed in the center of the supporting connecting disks.

[0009] The beneficial effects of adopting the above technical solution are: the array antenna described in this application includes a bottom layer, a middle layer and a top layer of an all-metal phase correction structure (AMPCS). The AMPCS does not require an expensive microwave substrate or any bonding technology, which greatly reduces the manufacturing cost and eliminates the main obstacle to the application of ERAs. The AMPCS was made using existing laser cutting technology and placed at a sub-wavelength distance from the ERA. The AMPCS significantly compensates for the non-uniform phase delay of the antenna aperture, significantly increases the peak gain of the antenna by 8.4dB, and the 1dB gain bandwidth is about 6%. The measured radiation pattern is very stable, and the sidelobe level SLL is better than −13dB in both the E plane and the H plane. The proposed stand-alone AMPCS does not require any mechanical support or protection and can be used for other aperture antennas for near-field enhancement. The ERA was used for testing to verify the results, and the power capacity was large, indicating that the phase uniformity of the ERA aperture was significantly improved, the antenna peak gain was increased by 8.4dB, and the sidelobe levels (SLLs) were improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0011] Figure 1 is a schematic diagram of the structure of the array antenna according to an embodiment of the present invention;

[0012] Figure 2 is a schematic diagram of a top-layer all-metal phase correction structure (AMPCS) in an array antenna according to an embodiment of the present invention (wherein the white part is the metal part and the black part is the hollow part);

[0013] Figure 3 is a schematic diagram of a middle-layer all-metal phase correction structure (AMPCS) in an array antenna according to an embodiment of the present invention (wherein the white part is the metal part and the black part is the hollow part);

[0014] Figure 4 is a schematic diagram of a bottom all-metal phase correction structure (AMPCS) in an array antenna according to an embodiment of the present invention (wherein the white part is the metal part and the black part is the hollow part);

[0015] Figure 5 yes Figure 2-Figure 4 A schematic structural diagram of the first correction unit;

[0016] Figure 6 yes Figure 2-Figure 4 A schematic diagram of the structure of the second correction unit;

[0017] Figure 7 is the E-plane electric field distribution diagram of the array antenna in the presence of AMPCS;

[0018] Figure 8a-8b is a scanning characteristic simulation result when the working frequency of the array antenna according to the embodiment of the present invention is 11 GHz;

[0019] Among them: 1. Resonator antenna ERA body; 2. Partial reflection surface PRS; 3. Bottom layer all-metal phase correction structure; 4. Middle layer all-metal phase correction structure; 5. Top layer all-metal phase correction structure; 6. Insulating column; 7. First correction unit; 8. Second correction unit; 9. Disc; 10. First square block; 11. First connecting line; 12. Second square block; 13. Second connecting line; 14. Support connecting disc. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] like Figure 1 As shown, an embodiment of the present invention discloses a low-profile two-dimensional beam scanning array antenna, including a resonator antenna ERA body 1 located at the lower side, the antenna body includes a partially reflecting surface PRS 2, a bottom layer all-metal phase correction structure 3 is fixed on the upper side of the partially reflecting surface PRS2, a middle layer all-metal phase correction structure 4 is fixed on the upper side of the bottom layer all-metal phase correction structure 3, a top layer all-metal phase correction structure 5 is fixed on the upper side of the middle layer all-metal phase correction structure 4, the distance between the bottom layer all-metal phase correction structure 3 and the partially reflecting surface PRS 2 is λ0 / 4, the distance between the bottom layer all-metal phase correction structure 3 and the middle layer all-metal phase correction structure 4 is λ0 / 3, the distance between the middle layer all-metal phase correction structure 4 and the top layer all-metal phase correction structure 5 is λ0 / 3, and λ0 is the free space wavelength at the operating frequency of the resonator antenna ERA body.

[0023] Further, such as Figure 1 As shown, the bottom all-metal phase correction structure 3 and the partial reflection surface PRS 2, the middle all-metal phase correction structure 4 and the bottom all-metal phase correction structure 3, and the top all-metal phase correction structure 5 and the middle all-metal phase correction structure 4 are fixed together by insulating columns 6.

[0024] Furthermore, correction units for adjusting the phase are formed on the bottom all-metal phase correction structure 3, the middle all-metal phase correction structure 4 and the top all-metal phase correction structure 5. When designing the all-metal phase correction unit (AMPCS), appropriate correction units are selected and arranged.

[0025] Due to the recent advances in metal fabrication technology, there are a variety of fabrication methods that can be used to realize the proposed AMPCS. There are five possible prototyping procedures, including computer numerical control (CNC) machining, plasma cutting, metal additive manufacturing, water jet cutting, and laser cutting. Among them, the last two methods are preferred for AMPCS prototyping. The AMPCS in this application is made of stainless steel sheets using cutting-edge laser technology. The thickness of the metal sheet plays a crucial role in the fabrication and durability of the AMPCS. From a packaging perspective, it is better to choose a larger thickness because it is more sustainable and does not require any additional support such as a radome or foam substrate. However, since thick metal sheets absorb too much heat, an increase in metal thickness increases the chance of metal failure during the manufacturing process. Therefore, a trade-off needs to be made at the beginning of the design process. In this design, a thickness of 1mm is recommended considering the large number of perforations performed on each surface of the AMPCS. Such a choice ensures the manufacturability and robustness of the free-standing AMPCS.

[0026] Figure 2-Figure 4 The three-layer AMPCS fabricated by a laser cutter is shown with a maximum wire cutting speed of 800 mm / s. The layers are separated by four nylon spacers to form the AMPCS and placed on the antenna at a distance of λ0 / 4 from the PRS as shown in the figure. Figure 1 The reason for choosing the λ0 / 4 space between PRS and AMPCS is because the local phase values ​​of the antenna aperture field are captured on an imaginary plane at the same distance from the PRS, and therefore, AMPCS is expected to have the best performance at this distance from the radiating aperture. It should be mentioned that the design procedure of AMPCS is not dependent on PRS and can be applied to ERAs regardless of their PRS type.

[0027] The near electric field of the antenna system was numerically calculated using the time domain solver of CST MWS. Figure 7 As shown in the figure, it can be seen that the aperture phase distribution of the antenna system has been significantly enhanced, and the uniform phase area has been expanded by more than one time. The uniform phase area refers to the antenna aperture area where the phase error is less than 50.

[0028] The input reflection coefficient of ERA was simulated and measured using CST MWS and Agilent PNA-XN5242 A vector network analyzer, respectively, and plotted in the figure. According to the measured results, the bandwidth of the 10dB |S11| AMPCS antenna is 50°, and is 42% from 10.6 GHz to 16.3GHz, which is very consistent with the predicted value of CST MWS. The far-field peak gain and directivity of AMPCSERA were measured in the near-field system, and the spherical near-field range was compared with the predicted results, verifying that the antenna peak gain was significantly improved by 8.4dB. According to the measurement, the 1dB directivity and gain bandwidth are 6.4% and 5.9%, respectively, which verifies the stable far-field performance of the antenna system in the required typical frequency band.

[0029] The use of AMPCS improves the directivity and gain of the ERA due to the enhanced phase distribution of the antenna aperture, which can be seen from the visualized electric field radiation in the E-plane, as shown in the figure. This radiation snapshot depicts the conversion of the spherical wavefront into a near-plane wavefront of Ey, and the aperture efficiency of the antenna is significantly increased from 4% to 28% due to AMPCS. The transparency of AMPCS can be estimated by examining the color representing the intensity to estimate the changes in the electric field at the input and output of AMPCS in the figure. It can be observed that there are almost the same colors (intensities) below and above the AMPCS, which shows good transmission characteristics in addition to phase correction. The directivity patterns of the antenna in the two main planes are plotted in the figure, showing that the SLL in the E-plane and H-plane are -13.2 dB and -13.5 dB, respectively, indicating that the SLL in the E-plane is improved by about 8 dB.

[0030] Furthermore, Figure 2 is a schematic diagram of a top-layer all-metal phase correction structure, such as Figure 2 as well as Figure 5-Figure 6As shown, the top-layer all-metal phase correction structure 4 includes a plurality of first correction units 7, a plurality of second correction units 8, a plurality of disks 9 and connecting lines. The outer circle of the top-layer all-metal phase correction structure 3 forms a circle of first correction units 7 connected to each other, the first correction unit 7 includes a first square block 10 located in the middle and first connecting lines 11 vertically connected to the four sides of the first square block 10, two circles of second correction units 8 connected to each other are formed on the inner side of the first correction unit 7 located in the outer circle, the first correction unit 7 is connected to the adjacent second correction unit 8, the second correction unit 8 includes a second square block 12 located in the middle and second connecting lines 13 vertically connected to the four sides of the second square block 12, the area of ​​the first square block 10 is larger than the area of ​​the second square block 12, and the first square block 10 and the first correction unit 7 are connected by the first connecting lines 13. 1 is connected, the first correction unit 7 and the second correction unit 8 are connected to each other through a first connecting line 11 and a second connecting line 12, a circle of disks 9 is formed on the inner side of the second correction unit 8 located in the inner circle, and the disks 9 and the second correction unit 8 of the inner circle are interconnected through connecting lines, the inner circle of the disks 9 is formed with cross-shaped connecting lines, and the ends of the connecting lines located in the inner circle of the disks 9 have free ends, so that a gap is formed at the center of the top-level all-metal phase correction structure 5, and a supporting connecting disk 14 is located at the four corners of the top-level all-metal phase correction structure 5 on the outer side of the first correction unit 7, and the supporting connecting disk 14 is connected to the first correction unit 7, and a mounting hole is formed at the center of the supporting connecting disk 13.

[0031] Furthermore, Figure 3 is a schematic diagram of a middle-layer all-metal phase correction structure, such as Figure 3 as well as Figure 5-Figure 6As shown, the middle-layer all-metal phase correction structure 4 includes a plurality of first correction units 7, a plurality of second correction units 8, a plurality of disks 9 and connecting lines. The outer circle of the middle-layer all-metal phase correction structure 4 is formed with three circles of second correction units 8 connected to each other. The second correction unit 8 includes a second square block 12 located in the middle and second connecting lines 13 vertically connected to the four sides of the second square block 12. Two circles of first correction units 7 connected to each other are formed on the inner side of the second correction unit 8 located in the inner circle. The first correction unit 7 is interconnected with the adjacent second correction units 8. The first correction unit 7 includes a first square block 10 located in the middle and first connecting lines 11 vertically connected to the four sides of the first square block 10. The area of ​​the square block 10 is larger than the area of ​​the second square block 12. The first square block 10 is connected to the first correction unit 7 through the first connecting line 11, and the first correction unit 7 and the second correction unit 8 are connected to each other through the first connecting line 11 and the second connecting line 13. A circle of disks 9 is formed on the inner side of the first correction unit 7 located in the inner circle, and the disks 9 and the first correction unit 7 in the inner circle are interconnected through connecting lines. The inner circle of the disks 9 is formed with cross-shaped connecting lines. The supporting connecting disks 14 are located at the four corners of the middle-layer all-metal phase correction structure 4 on the outer side of the second correction unit 7, and the supporting connecting disks 14 are connected to the second correction unit 8, and a mounting hole is formed in the center of the supporting connecting disks 14.

[0032] Furthermore, Figure 4 is a schematic diagram of a middle-layer all-metal phase correction structure, such as Figure 3 as well as Figure 5-Figure 6As shown, the bottom all-metal phase correction structure 3 includes a plurality of first correction units 7, a plurality of second correction units 8, a plurality of disks 9 and connecting lines. The outer circle of the bottom all-metal phase correction structure 3 forms a circle of first correction units 7 connected to each other, the first correction unit 7 includes a first square block 10 located in the middle and first connecting lines 11 vertically connected to the four sides of the first square block 10, two circles of second correction units 8 connected to each other are formed on the inner side of the first correction unit 7 located in the outer circle, the first correction unit 7 is connected to the adjacent second correction unit 8, the second correction unit 8 includes a second square block 12 located in the middle and second connecting lines 13 vertically connected to the four sides of the second square block 12, the area of ​​the first square block 10 is larger than the area of ​​the second square block 12, the first square block 10 is larger than the area of ​​the second square block 12, and the second square block 12 is smaller than the second square block 12. A square block 10 is connected to the first correction unit 7 through a first connecting line 11, and the first correction unit 7 and the second correction unit 8 are connected to each other through the first connecting line 11 and the second connecting line 13. A circle of disks 9 is formed on the inner side of the second correction unit 8 located in the inner circle, and the disks 9 and the second correction unit 8 in the inner circle are interconnected through connecting lines. The inner circle of the disks is formed with cross-shaped connecting lines. A supporting connecting disk 14 is located at the four corners of the underlying all-metal phase correction structure 3 on the outer side of the first correction unit 7, and the supporting connecting disk 14 is connected to the first correction unit 7, and a mounting hole is formed in the center of the supporting connecting disk 14.

[0033] It should be noted that the bottom all-metal phase correction structure 3, the middle all-metal phase correction structure 4 and the top all-metal phase correction structure 5 in the array antenna described in the present application can achieve a better phase correction effect through the above settings. Figure 7 is the E-plane electric field distribution diagram of the array antenna in the presence of AMPCS; Figure 8a-8b This is a scanning characteristic simulation result when the operating frequency of the array antenna described in the embodiment of the present invention is 11 GHz.

[0034] In summary, unlike the existing PCS, the AMPCS in the array antenna of the present application has an extremely low manufacturing cost, and is tested using ERA to verify its results, which shows that the phase uniformity of the ERA aperture is significantly improved, the antenna peak gain is increased by 8.4dB, and the sidelobe levels (SLLs) are improved.

Claims

1. A low-profile two-dimensional beam scanning array antenna, characterized in that: The invention comprises a resonator antenna body (1) located at the bottom, the resonator antenna body comprises a partial reflection surface PRS (2), a bottom layer all-metal phase correction structure (3) is fixed on the upper side of the partial reflection surface PRS (2), a middle layer all-metal phase correction structure (4) is fixed on the upper side of the bottom layer all-metal phase correction structure (3), a top layer all-metal phase correction structure (5) is fixed on the upper side of the middle layer all-metal phase correction structure (4), the distance between the bottom layer all-metal phase correction structure (3) and the partial reflection surface PRS (2) is λ0 / 4, the distance between the bottom layer all-metal phase correction structure (3) and the middle layer all-metal phase correction structure (4) is λ0 / 3, and the distance between the middle layer all-metal phase correction structure (4) and the top layer all-metal phase correction structure (5) is λ0 / 3, wherein λ0 is the free space wavelength at the operating frequency of the resonator antenna body; The top all-metal phase correction structure (5) comprises a plurality of first correction units (7), a plurality of second correction units (8), a plurality of disks (9) and connecting lines. The outer ring of the top all-metal phase correction structure (5) forms a ring of first correction units (7) connected to each other. The first correction unit (7) comprises a first square block (10) located in the middle and first connecting lines (11) vertically connected to four sides of the first square block (10). Two rings of second correction units (8) connected to each other are formed on the inner side of the first correction unit (7) located in the outer ring. The first correction unit (7) is connected to the adjacent second correction unit (8). The second correction unit (8) comprises a second square block (12) located in the middle and second connecting lines (13) vertically connected to four sides of the second square block (12). The area of ​​the first square block (10) is larger than that of the second square block (12). The first square block (10) is connected to the first correction unit (7) via a first connecting line (11), and the first correction unit (7) and the second correction unit (8) are connected to each other via the first connecting line (11) and the second connecting line (13). A circle of disks (9) is formed on the inner side of the second correction unit (8) located in the inner circle, and the disks (9) and the second correction unit (8) in the inner circle are interconnected via connecting lines. The inner circle of the disk (9) is formed with connecting lines in a cross shape, and the ends of the connecting lines located in the inner circle of the disk (9) have free ends, so that a gap is formed at the center of the top all-metal phase correction structure (5). A supporting connecting disk (14) is located at the four corners of the top all-metal phase correction structure (5) outside the first correction unit (7), and the supporting connecting disk (14) is connected to the first correction unit (7). A mounting hole is formed at the center of the supporting connecting disk (14).

2. The low-profile two-dimensional beam scanning array antenna according to claim 1, characterized in that: The bottom layer all-metal phase correction structure (3) and the partial reflection surface PRS (2), the middle layer all-metal phase correction structure (4) and the bottom layer all-metal phase correction structure (3), and the top layer all-metal phase correction structure (5) and the middle layer all-metal phase correction structure (4) are fixed together via insulating columns (6).

3. The low-profile two-dimensional beam scanning array antenna according to claim 1, characterized in that: Correction units for adjusting phase are formed on the bottom layer all-metal phase correction structure (3), the middle layer all-metal phase correction structure (4) and the top layer all-metal phase correction structure (5).

4. The low-profile two-dimensional beam scanning array antenna according to claim 1, characterized in that: The thickness of the bottom layer all-metal phase correction structure (3), the middle layer all-metal phase correction structure (4) and the top layer all-metal phase correction structure (5) is 1 mm.

5. The low-profile two-dimensional beam scanning array antenna according to claim 1, characterized in that: The bottom layer all-metal phase correction structure (3), the middle layer all-metal phase correction structure (4) and the top layer all-metal phase correction structure (5) are made of stainless steel by laser cutting or water jet cutting.

6. The low-profile two-dimensional beam scanning array antenna according to claim 1, characterized in that: The middle-layer all-metal phase correction structure (4) comprises a plurality of first correction units (7), a plurality of second correction units (8), a plurality of disks (9) and connecting wires. The outer ring of the middle-layer all-metal phase correction structure (4) is formed with three circles of second correction units (8) connected to each other. The second correction unit (8) comprises a second square block (12) located in the middle and second connecting wires (13) vertically connected to four sides of the second square block (12). Two circles of first correction units (7) are formed on the inner side of the second correction unit (8) located in the inner ring. The first correction unit (7) is connected to adjacent second correction units (8). The first correction unit (7) comprises a first square block (10) located in the middle and first connecting wires (11) vertically connected to four sides of the first square block (10). The area of ​​the first square block (10) is larger than the area of ​​the second square block (12); the first square block (10) is connected to the first correction unit (7) via a first connecting line (11); the first correction unit (7) and the second correction unit (8) are connected to each other via a first connecting line (11) and a second connecting line (13); a circle of disks (9) is formed on the inner side of the first correction unit (7) located in the inner circle; the disks (9) and the first correction unit (7) in the inner circle are interconnected via connecting lines; the inner circle of the disks (9) is formed with connecting lines in the shape of a cross; a supporting connecting disk (14) is located at the four corners of the middle-layer all-metal phase correction structure (4) on the outer side of the second correction unit (8); the supporting connecting disk (14) is connected to the second correction unit (8); and a mounting hole is formed at the center of the supporting connecting disk (14).

7. The low-profile two-dimensional beam scanning array antenna according to claim 1, characterized in that: The bottom all-metal phase correction structure (3) comprises a plurality of first correction units (7), a plurality of second correction units (8), a plurality of disks (9) and connecting wires. The outer ring of the bottom all-metal phase correction structure (3) forms a ring of first correction units (7) connected to each other. The first correction unit (7) comprises a first square block (10) located in the middle and first connecting wires (11) vertically connected to four sides of the first square block (10). Two rings of second correction units (8) connected to each other are formed on the inner side of the first correction unit (7) located in the outer ring. The first correction unit (7) is connected to the adjacent second correction unit (8). The second correction unit (8) comprises a second square block (12) located in the middle and second connecting wires (13) vertically connected to four sides of the second square block (12). The area of ​​the block (10) is larger than the area of ​​the second square block (12); the first square block (10) is connected to the first correction unit (7) via a first connecting line (11); the first correction unit (7) and the second correction unit (8) are connected to each other via a first connecting line (11) and a second connecting line (13); a circle of disks (9) is formed on the inner side of the second correction unit (8) located in the inner circle; the disks (9) and the second correction units (8) in the inner circle are interconnected via connecting lines; the inner circle of the disks is formed with connecting lines in the shape of a cross; a supporting connecting disk (14) is located at the four corners of the bottom all-metal phase correction structure (3) on the outer side of the first correction unit (7); the supporting connecting disk (14) is connected to the first correction unit (7); and a mounting hole is formed at the center of the supporting connecting disk (14).

8. The low-profile two-dimensional beam scanning array antenna according to claim 2, characterized in that: The insulating column (6) is made of nylon.

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