Metasurface waveguide structure and millimeter wave MIMO slot waveguide array antenna

Abstract

The present application provides a metasurface waveguide structure and a millimeter wave MIMO slot waveguide array antenna. The metasurface waveguide structure includes a first metal strip array and a second metal strip array located between a first metal plate and a second metal plate that are stacked; a hollow groove is provided between the first metal plate and the second metal plate; the first metal strip array is arranged on both sides of the first metal plate surface corresponding to the hollow groove; the second metal strip array is arranged on both sides of the second metal plate surface corresponding to the hollow groove; the projection of the first metal strip array on either side of the hollow groove in a direction perpendicular to the first metal plate is connected with the projection of the second metal strip array on the corresponding side in a direction perpendicular to the first metal plate; the first metal plate, the second metal plate, the first metal strip array and the second metal strip array restrict electromagnetic waves to propagate in the hollow groove. The strip array structure has a low shape complexity and a low mechanical processing difficulty, which is convenient for maintaining dimensional stability during processing.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, in particular to a metasurface waveguide structure and a millimeter-wave MIMO slot waveguide array antenna implemented therein. Background Art

[0002] In wireless communication systems, microstrip and substrate integrated waveguide structures have been widely used in antenna design due to their low cost, easy manufacturing and high integration. However, in millimeter wave frequency band application scenarios, microstrip and substrate integrated waveguide structures will bring higher dielectric loss. Traditional rectangular waveguides have no dielectric loss and low conductor loss, so they can be used in millimeter wave and terahertz bands. However, rectangular waveguides require vacuum welding to achieve perfect electrical contact, and high-precision vacuum welding and diffusion welding will result in high costs.

[0003] Gap waveguide is a waveguide suitable for high frequency, especially millimeter wave and terahertz applications. The most commonly used gap waveguides include ridge gap waveguide, slotted gap waveguide and inverted microstrip gap waveguide. The significant advantage of this technology is that it uses a non-contact electromagnetic bandgap structure instead of metal contact to limit the propagation of electromagnetic waves inside the waveguide. The non-contact feature brings many benefits. Since the gap waveguide filter is contactless in structure, gold or silver plating is not required. The performance of the gap waveguide filter without gold or silver plating is comparable to that of the traditional rectangular waveguide filter. The non-contact feature also makes the layer-by-layer integration of microwave or millimeter wave circuits more convenient. However, when the frequency rises to 70GHz, the gap waveguide has the problem of greater difficulty in mechanical processing. Summary of the invention

[0004] In view of the above-mentioned problems, the present application is proposed to provide a metasurface waveguide structure and a slot waveguide array antenna implemented by the structure and the slot waveguide array antenna, which overcomes the problems or at least partially solves the problems, including:

[0005] A metasurface waveguide structure comprises a first metal strip array and a second metal strip array;

[0006] The first metal strip array and the second metal strip array are located between a first metal plate and a second metal plate that are stacked; a hollow groove is provided between the first metal plate and the second metal plate; the first metal strip array is arranged on both sides of the surface of the first metal plate corresponding to the hollow groove; the second metal strip array is arranged on both sides of the surface of the second metal plate corresponding to the hollow groove;

[0007] The projection of the first metal strip array on either side of the hollow slot in a direction perpendicular to the first metal plate is connected in an interlocking manner with the projection of the second metal strip array on the corresponding side in a direction perpendicular to the first metal plate;

[0008] When an electromagnetic wave passes through the metasurface waveguide structure, the first metal plate, the second metal plate, the first metal strip array, and the second metal strip array confine the electromagnetic wave to propagate within the hollow slot.

[0009] Preferably, the sum of the height of the first metal strip array in a direction perpendicular to the first metal plate and the height of the second metal strip array in a direction perpendicular to the second metal plate is equal to the distance between the opposite surfaces of the first metal plate and the second metal plate.

[0010] Preferably, the first metal strip array includes first metal strips arranged in parallel; the second metal strip array includes second metal strips arranged in parallel; the width of the first metal strip in the arrangement direction is equal to the width of the second metal strip in the arrangement direction.

[0011] A millimeter wave MIMO slot waveguide array antenna based on any of the above-mentioned metasurface waveguide structures, comprising: a first antenna plate, a second antenna plate, a third antenna plate, a fourth antenna plate and a fifth antenna plate stacked in sequence;

[0012] The first antenna plate is provided with a first number of first through holes and a second number of second through holes;

[0013] The second antenna plate is provided with the first number of third through holes and the second number of fourth through holes; the positions of the third through holes correspond one-to-one to the positions of the first through holes; and the positions of the fourth through holes correspond one-to-one to the positions of the second through holes;

[0014] The first number of first supersurface waveguide structures is disposed between the second antenna plate and the third antenna plate; one end of the hollow groove of the first supersurface waveguide structure corresponds to the position of the third through hole one by one;

[0015] The third antenna plate is provided with the first number of fifth through holes and the second number of sixth through holes; the fifth through holes correspond one-to-one to the positions of the other ends of the hollow slots of the first metasurface waveguide structure, and the sixth through holes correspond one-to-one to the positions of the fourth through holes;

[0016] The second number of second supersurface waveguide structures is arranged between the third antenna plate and the fourth antenna plate; one end of the hollow groove of the second supersurface waveguide structure corresponds to the position of the sixth through hole one by one;

[0017] The fourth antenna plate is provided with the first number of seventh through holes and the second number of eighth through holes; the positions of the seventh through holes correspond one-to-one to the positions of the fifth through holes; and the positions of the eighth through holes correspond one-to-one to the positions of the other ends of the hollow slots of the second metasurface waveguide structure;

[0018] The first number of third metasurface waveguide structures and the second number of fourth metasurface waveguide structures are provided between the fourth antenna plate and the fifth antenna plate; the middle part of the hollow groove of the third metasurface waveguide structure corresponds one-to-one to the position of the seventh signal through hole; the middle part of the hollow groove of the fourth metasurface waveguide structure corresponds one-to-one to the position of the eighth signal through hole;

[0019] The fifth antenna board is provided with a ninth through hole array of the first number and a tenth through hole array of the second number; the ninth through hole array corresponds one-to-one with the position of the hollow slots of the third supersurface waveguide structure; the tenth through hole array corresponds one-to-one with the position of the hollow slots of the fourth supersurface waveguide structure.

[0020] Preferably, a first groove is provided on the surface of the second antenna board facing the third antenna board, and the first supersurface waveguide structure is arranged inside the first groove.

[0021] Preferably, a second groove is provided on the surface of the third antenna board facing the fourth antenna board, and the second supersurface waveguide structure is arranged inside the second groove.

[0022] Preferably, a third groove is provided on the surface of the fifth antenna board facing the fourth antenna board, and the third metasurface waveguide structure is arranged inside the third groove.

[0023] Preferably, a fourth groove is provided on the surface of the fifth antenna plate facing the fourth antenna plate, and the fourth metasurface waveguide structure is arranged inside the fourth groove.

[0024] Preferably, the shapes of the first through hole, the second through hole, the third through hole, the fourth through hole, the fifth through hole, the sixth through hole, the seventh through hole, the eighth through hole, the ninth through hole and the tenth through hole are one or a combination of rectangular, elliptical, waist-shaped, T-shaped, cross-shaped and dumbbell-shaped.

[0025] Preferably, the first number is 4; and the second number is 4.

[0026] This application has the following advantages:

[0027] In response to the problem that the existing gap waveguide is difficult to process, the present application provides a solution of using an alternating strip array structure to replace metal pillars to form a high-impedance surface, specifically: a supersurface waveguide structure, comprising a first metal strip array and a second metal strip array; the first metal strip array and the second metal strip array are located between a first metal plate and a second metal plate that are stacked; a hollow groove is provided between the first metal plate and the second metal plate; the first metal strip array is arranged on both sides of the surface of the first metal plate corresponding to the hollow groove; the second metal strip array is arranged on both sides of the surface of the second metal plate corresponding to the hollow groove; the projection of the first metal strip array on either side of the hollow groove in a direction perpendicular to the first metal plate is embedded and connected with the projection of the second metal strip array on the corresponding side in a direction perpendicular to the first metal plate; when an electromagnetic wave passes through the supersurface waveguide structure, the first metal plate, the second metal plate, the first metal strip array and the second metal strip array limit the electromagnetic wave to propagate within the hollow groove.

[0028] By using an alternating strip array structure between two layers of metal plates to form a high-impedance surface, the propagation of electromagnetic waves in the hollow slot can be effectively limited, thereby reducing energy leakage, improving transmission efficiency, and reducing signal loss; at the same time, the strip array structure has a low shape complexity and low mechanical processing difficulty, which makes it easy to maintain dimensional stability during the processing process, thereby ensuring product yield and reducing processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the description of the present application will be briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 is a schematic diagram of the first part of the structure of the metasurface waveguide structure provided by an embodiment of the present application;

[0031] Figure 2 is a schematic diagram of the second part of the structure of the metasurface waveguide structure provided in one embodiment of the present application;

[0032] Figure 3 is a schematic diagram of the overall structure of a metasurface waveguide structure provided in one embodiment of the present application;

[0033] Figure 4 It is a schematic diagram of the overall structure of a slot waveguide array antenna provided in one embodiment of the present application;

[0034] Figure 5It is a schematic diagram of the exploded structure of a slot waveguide array antenna provided in one embodiment of the present application;

[0035] Figure 6 It is a front structural schematic diagram of a first antenna plate in a slot waveguide array antenna provided in an embodiment of the present application;

[0036] Figure 7 It is a schematic diagram of the reverse structure of the first antenna plate in the slot waveguide array antenna provided in one embodiment of the present application;

[0037] Figure 8 It is a front structural schematic diagram of a second antenna plate in a slot waveguide array antenna provided in an embodiment of the present application;

[0038] Fig. 9 It is a schematic diagram of the reverse structure of the second antenna plate in the slot waveguide array antenna provided in one embodiment of the present application;

[0039] Fig.10 It is a schematic diagram of the front structure of the third antenna plate in the slot waveguide array antenna provided in one embodiment of the present application;

[0040] Fig.11 It is a schematic diagram of the reverse structure of the third antenna plate in the slot waveguide array antenna provided in one embodiment of the present application;

[0041] Fig.12 is a front structural schematic diagram of a fourth antenna plate in a slot waveguide array antenna provided in an embodiment of the present application;

[0042] Fig.13 It is a schematic diagram of the reverse structure of the fourth antenna plate in the slot waveguide array antenna provided in one embodiment of the present application;

[0043] Fig.14 is a schematic diagram of the front structure of a fifth antenna plate in the slot waveguide array antenna provided in an embodiment of the present application;

[0044] Fig.15 It is a schematic diagram of the reverse structure of the fifth antenna plate in the slot waveguide array antenna provided in one embodiment of the present application;

[0045] Fig.16 It is a measured standing wave diagram of a slot waveguide array antenna provided by a specific implementation of the present application;

[0046] Fig.17 It is a far-field measurement pattern of a slot waveguide array antenna in the azimuth plane at 77 GHz provided by a specific implementation of the present application;

[0047] Fig.18 This is the far-field measurement pattern of the slot waveguide array antenna in the 77 GHz elevation plane provided by a specific implementation of the present application.

[0048] The reference numerals in the drawings of the specification are as follows:

[0049] 11. First metal plate; 12. Second metal plate; 20. Hollow groove; 31. First metal strip array; 32. Second metal strip array; 40. Slot waveguide array antenna; 41. First antenna board; 42. Second antenna board; 43. Third antenna board; 44. Fourth antenna board; 45. Fifth antenna board. DETAILED DESCRIPTION

[0050] In order to make the purpose, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0051] The inventors have found through analysis of the prior art that the existing gap waveguide uses metal pillars to achieve a high impedance surface. When the frequency rises to 70 GHz, the size of the metal pillars becomes very small, making mechanical processing more difficult and the antenna processing cost higher.

[0052] It should be noted that, in any of the following embodiments, the strip refers to a beam-like structure having a rectangular cross-section and extending in a straight direction.

[0053] Reference Figure 1-3 , in one embodiment of the present application, a metasurface waveguide structure is provided, comprising a first metal strip array 31 and a second metal strip array 32;

[0054] The first metal strip array 31 and the second metal strip array 32 are located between the first metal plate 11 and the second metal plate 12 which are stacked; a hollow groove 20 is provided between the first metal plate 11 and the second metal plate 12; the first metal strip array 31 is arranged on both sides of the surface of the first metal plate 11 corresponding to the hollow groove 20; the second metal strip array 32 is arranged on both sides of the surface of the second metal plate 12 corresponding to the hollow groove 20;

[0055] The projection of the first metal strip array 31 on any side of the hollow slot 20 in a direction perpendicular to the first metal plate 11 is engaged with the projection of the second metal strip array 32 on the corresponding side in a direction perpendicular to the first metal plate 11;

[0056] When an electromagnetic wave passes through the metasurface waveguide structure, the first metal plate 11 , the second metal plate 12 , the first metal strip array 31 , and the second metal strip array 32 confine the electromagnetic wave to propagate within the hollow slot 20 .

[0057] By using an alternating strip array structure between two layers of metal plates to form a high-impedance surface, the propagation of electromagnetic waves in the hollow slot 20 can be effectively limited, thereby reducing energy leakage, improving transmission efficiency, and reducing signal loss; at the same time, the strip array structure has a low shape complexity and low mechanical processing difficulty, which makes it easy to maintain dimensional stability during the processing process, thereby ensuring product yield and reducing processing costs.

[0058] Next, the metasurface waveguide structure in this exemplary embodiment will be further described.

[0059] In one embodiment of the present application, the sum of the height of the first metal strip array 31 in a direction perpendicular to the first metal plate 11 and the height of the second metal strip array 32 in a direction perpendicular to the second metal plate 12 is equal to the distance between the opposite surfaces of the first metal plate 11 and the second metal plate 12. In theoretical design, the first metal strip array 31 and the second metal strip array 32 abut against each other in a direction perpendicular to the first metal plate 11. In actual production, there may be a gap between the first metal strip array 31 and the second metal strip array 32 in a direction perpendicular to the first metal plate 11, but the gap must be less than or equal to 0.1 mm to prevent leakage of surface waves.

[0060] In an embodiment of the present application, the height of the first metal strip array 31 in a direction perpendicular to the first metal plate 11 is equal to the height of the second metal strip array 32 in a direction perpendicular to the second metal plate 12. The heights of the first metal strip array 31 and the second metal strip array 32 are equal, and only a single size parameter needs to be controlled during the processing, and there is no need to adjust and control structures of different sizes, which reduces the complexity in production and reduces the processing cost.

[0061] As an example, the height of the first metal strip array 31 in a direction perpendicular to the first metal plate 11 and the height of the second metal strip array 32 in a direction perpendicular to the second metal plate 12 are both 1 / 6 of the antenna wavelength.

[0062] In an embodiment of the present application, the first metal strip array 31 includes first metal strips arranged in parallel; the second metal strip array 32 includes second metal strips arranged in parallel; the width of the first metal strip in the arrangement direction is equal to the width of the second metal strip in the arrangement direction. The widths of the first metal strip and the second metal strip are equal, and only a single size parameter needs to be controlled during the processing, and there is no need to adjust and control structures of different sizes, which reduces the complexity in production and reduces the processing cost.

[0063] As an example, the width of the first metal strip in the arrangement direction and the width of the second metal strip in the arrangement direction are both 1 / 4 of the antenna wavelength.

[0064] Reference Figure 4-15 In one embodiment of the present application, there is also provided a slot waveguide array antenna 40 based on the millimeter wave MIMO (Multiple-Input Multiple-Output) metasurface waveguide structure described in any of the above embodiments, comprising: a first antenna plate 41, a second antenna plate 42, a third antenna plate 43, a fourth antenna plate 44 and a fifth antenna plate 45 which are stacked in sequence;

[0065] The first antenna plate 41 is provided with a first number of first through holes and a second number of second through holes;

[0066] The second antenna plate 42 is provided with the first number of third through holes and the second number of fourth through holes; the positions of the third through holes correspond one-to-one to the positions of the first through holes; and the positions of the fourth through holes correspond one-to-one to the positions of the second through holes;

[0067] The first number of first metasurface waveguide structures are disposed between the second antenna plate 42 and the third antenna plate 43; one end of the hollow groove 20 of the first metasurface waveguide structure corresponds to the position of the third through hole one by one;

[0068] The third antenna plate 43 is provided with the first number of fifth through holes and the second number of sixth through holes; the fifth through holes correspond one-to-one to the positions of the other ends of the hollow slots 20 of the first metasurface waveguide structure, and the sixth through holes correspond one-to-one to the positions of the fourth through holes;

[0069] The second number of second supersurface waveguide structures is disposed between the third antenna plate 43 and the fourth antenna plate 44; one end of the hollow groove 20 of the second supersurface waveguide structure corresponds to the position of the sixth through hole one by one;

[0070] The fourth antenna plate 44 is provided with the first number of seventh through holes and the second number of eighth through holes; the positions of the seventh through holes correspond one-to-one to the positions of the fifth through holes; and the positions of the eighth through holes correspond one-to-one to the positions of the other ends of the hollow slots 20 of the second metasurface waveguide structure;

[0071] The first number of third metasurface waveguide structures and the second number of fourth metasurface waveguide structures are provided between the fourth antenna plate 44 and the fifth antenna plate 45; the middle of the hollow groove 20 of the third metasurface waveguide structure corresponds one-to-one to the position of the seventh signal through hole; the middle of the hollow groove 20 of the fourth metasurface waveguide structure corresponds one-to-one to the position of the eighth signal through hole;

[0072] The fifth antenna plate 45 is provided with the ninth through hole array of the first number and the tenth through hole array of the second number; the ninth through hole array corresponds one-to-one with the position of the hollow slot 20 of the third metasurface waveguide structure; the tenth through hole array corresponds one-to-one with the position of the hollow slot 20 of the fourth metasurface waveguide structure;

[0073] Among them, the first supersurface waveguide structure, the second supersurface waveguide structure, the third supersurface waveguide structure and the fourth supersurface waveguide structure are all designed according to the supersurface waveguide structure described in any of the above embodiments.

[0074] By using an alternating strip array structure to form a high-impedance surface between the second antenna plate 42 and the third antenna plate 43, between the third antenna plate 43 and the fourth antenna plate 44, and between the fourth antenna plate 44 and the fifth antenna plate 45, the propagation of electromagnetic waves in the hollow slot 20 can be effectively limited, thereby reducing energy leakage, improving transmission efficiency, and reducing signal loss; at the same time, the strip array structure has a low shape complexity and a low mechanical processing difficulty, which makes it easy to maintain dimensional stability during the processing process, thereby ensuring product yield and reducing processing costs.

[0075] In one embodiment of the present application, a first groove is provided on the surface of the second antenna plate 42 facing the third antenna plate 43, and the first metasurface waveguide structure is arranged inside the first groove. The first groove provides a precise defined space for the first metasurface waveguide structure, so that the electromagnetic wave is effectively confined in the space, thereby further reducing energy leakage, improving transmission efficiency, and reducing signal loss.

[0076] In one embodiment of the present application, a second groove is provided on the surface of the third antenna plate 43 facing the fourth antenna plate 44, and the second metasurface waveguide structure is arranged inside the second groove. The second groove provides a precise defined space for the second metasurface waveguide structure, so that the electromagnetic wave is effectively confined in the space, thereby further reducing energy leakage, improving transmission efficiency, and reducing signal loss.

[0077] In one embodiment of the present application, a third groove is provided on the surface of the fifth antenna plate 45 facing the fourth antenna plate 44, and the third metasurface waveguide structure is arranged inside the third groove. The third groove provides a precise defined space for the third metasurface waveguide structure, so that the electromagnetic wave is effectively confined in the space, thereby further reducing energy leakage, improving transmission efficiency, and reducing signal loss.

[0078] In a preferred embodiment of the present application, a first number of third grooves are provided on the surface of the fifth antenna plate 45 facing the fourth antenna plate 44, and the third metasurface waveguide structures are arranged inside the third grooves in a one-to-one correspondence. By embedding the third metasurface waveguide structures in independent grooves, the electromagnetic fields of each other can be effectively isolated, and unnecessary coupling can be reduced, thereby improving the purity and reliability of the signal.

[0079] In one embodiment of the present application, a fourth groove is provided on the surface of the fifth antenna plate 45 facing the fourth antenna plate 44, and the fourth metasurface waveguide structure is arranged inside the fourth groove. The fourth groove provides a precise defined space for the fourth metasurface waveguide structure, so that the electromagnetic wave is effectively confined in the space, thereby further reducing energy leakage, improving transmission efficiency, and reducing signal loss.

[0080] In a preferred embodiment of the present application, a second number of fourth grooves are provided on the surface of the fifth antenna plate 45 facing the fourth antenna plate 44, and the fourth metasurface waveguide structures are arranged inside the fourth grooves in a one-to-one correspondence. By embedding the fourth metasurface waveguide structures in independent grooves, the electromagnetic fields of each other can be effectively isolated, and unnecessary coupling can be reduced, thereby improving the purity and reliability of the signal.

[0081] In one embodiment of the present application, the shapes of the first through hole, the second through hole, the third through hole, the fourth through hole, the fifth through hole, the sixth through hole, the seventh through hole, the eighth through hole, the ninth through hole, and the tenth through hole are one or a combination of rectangular, elliptical, waist-shaped, T-shaped, cross-shaped, and dumbbell-shaped.

[0082] In one embodiment of the present application, the first number is 4; the second number is 4.

[0083] In a first specific implementation of the present application, a metasurface waveguide structure is provided, comprising a first metal strip array 31 and a second metal strip array 32;

[0084] The first metal strip array 31 and the second metal strip array 32 are located between the first metal plate 11 and the second metal plate 12 which are stacked; a hollow groove 20 is provided between the first metal plate 11 and the second metal plate 12; the first metal strip array 31 is arranged on both sides of the surface of the first metal plate 11 corresponding to the hollow groove 20; the second metal strip array 32 is arranged on both sides of the surface of the second metal plate 12 corresponding to the hollow groove 20;

[0085] The sum of the height of the first metal strip array 31 in a direction perpendicular to the first metal plate 11 and the height of the second metal strip array 32 in a direction perpendicular to the second metal plate 12 is equal to the distance between the opposite surfaces of the first metal plate 11 and the second metal plate 12;

[0086] The height of the first metal strip array 31 in a direction perpendicular to the first metal plate 11 is equal to the height of the second metal strip array 32 in a direction perpendicular to the second metal plate 12, and both are 1 / 6 of the antenna wavelength;

[0087] The projection of the first metal strip array 31 on any side of the hollow slot 20 in a direction perpendicular to the first metal plate 11 is engaged with the projection of the second metal strip array 32 on the corresponding side in a direction perpendicular to the first metal plate 11;

[0088] The first metal strip array 31 includes first metal strips arranged in parallel; the second metal strip array 32 includes second metal strips arranged in parallel; the width of the first metal strip in the arrangement direction is equal to the width of the second metal strip in the arrangement direction, and both are 1 / 4 of the antenna wavelength;

[0089] When an electromagnetic wave passes through the metasurface waveguide structure, the first metal plate 11 , the second metal plate 12 , the first metal strip array 31 , and the second metal strip array 32 confine the electromagnetic wave to propagate within the hollow slot 20 .

[0090] In a second specific implementation of the present application, a millimeter wave MIMO slot waveguide array antenna 40 is provided, comprising: a first antenna plate 41, a second antenna plate 42, a third antenna plate 43, a fourth antenna plate 44 and a fifth antenna plate 45 which are stacked in sequence;

[0091] The first antenna plate 41 is provided with four first through holes and four second through holes;

[0092] The second antenna plate 42 is provided with four third through holes and four fourth through holes; the positions of the third through holes correspond one-to-one to the positions of the first through holes; the positions of the fourth through holes correspond one-to-one to the positions of the second through holes;

[0093] A first groove is provided on the surface of the second antenna plate 42 facing the third antenna plate 43, and four first supersurface waveguide structures are provided inside the first groove; one end of the hollow groove 20 of the first supersurface waveguide structure corresponds to the position of the third through hole one by one;

[0094] The third antenna plate 43 is provided with four fifth through holes and four sixth through holes; the fifth through holes correspond one-to-one to the positions of the other ends of the hollow slots 20 of the first metasurface waveguide structure, and the sixth through holes correspond one-to-one to the positions of the fourth through holes;

[0095] A second groove is provided on the surface of the third antenna plate 43 facing the fourth antenna plate 44, and four second supersurface waveguide structures are provided inside the second groove; one end of the hollow groove 20 of the second supersurface waveguide structure corresponds to the position of the sixth through hole one by one;

[0096] The fourth antenna plate 44 is provided with four seventh through holes and four eighth through holes; the positions of the seventh through holes correspond one-to-one to the positions of the fifth through holes; the positions of the eighth through holes correspond one-to-one to the positions of the other ends of the hollow slots 20 of the second metasurface waveguide structure;

[0097] The surface of the fifth antenna plate 45 facing the fourth antenna plate 44 is provided with four third grooves and four fourth grooves, each of the third grooves is provided with a third supersurface waveguide structure, and each of the fourth grooves is provided with a fourth supersurface waveguide structure; the middle of the hollow groove 20 of the third supersurface waveguide structure corresponds one-to-one to the position of the seventh signal through hole; the middle of the hollow groove 20 of the fourth supersurface waveguide structure corresponds one-to-one to the position of the eighth signal through hole;

[0098] The fifth antenna plate 45 is provided with four ninth through hole arrays and four tenth through hole arrays; the ninth through hole arrays correspond one-to-one to the positions of the hollow slots 20 of the third metasurface waveguide structure; the tenth through hole arrays correspond one-to-one to the positions of the hollow slots 20 of the fourth metasurface waveguide structure;

[0099] Wherein, the first supersurface waveguide structure, the second supersurface waveguide structure, the third supersurface waveguide structure and the fourth supersurface waveguide structure are all designed according to the supersurface waveguide structure described in the first specific implementation;

[0100] The first through hole, the second through hole, the third through hole, the fourth through hole, and the fifth through hole are in a dumbbell shape; the sixth through hole, the seventh through hole, the eighth through hole, the ninth through hole, and the tenth through hole are in a waist shape;

[0101] The operating frequency of the slot waveguide array antenna 40 is 77 GHz.

[0102] The standing wave ratio and gain of the slot waveguide array antenna 40 provided by the above specific implementation were measured, and the results were as follows:

[0103] Fig.16 The measured standing wave diagram of the slot waveguide array antenna 40 is shown. It can be seen that in the 77 GHz frequency band, the standing wave ratio is less than 1.5, indicating that the impedance matching performance of the antenna is good.

[0104] Fig.17 The far-field measurement radiation pattern of the slot waveguide array antenna 40 in the azimuth plane at 77 GHz is shown. It can be seen that within the range of -50° to 50°, the gain remains above 11 dB, and the peak value reaches above 14 dB, indicating that the antenna has a higher gain and a wider coverage range in the horizontal direction.

[0105] Fig.18 The far-field measurement radiation pattern of the slot waveguide array antenna 40 in the 77 GHz elevation plane is shown. It can be seen that the main lobe is clear and the side lobe suppression is good, indicating that the antenna has obvious directivity in the vertical direction.

[0106] The above embodiments are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to in detail.

[0107] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the interpretation of the attached claims includes the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0108] Finally, it should be noted that in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or terminal device including the elements.

[0109] The above is a detailed introduction to the metasurface waveguide structure provided by the present application and the slot waveguide array antenna implemented by it. The present specification uses specific embodiments to explain the principles and implementation methods of the present application. The above embodiments are only used to help understand the method and core ideas of the present application. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A metasurface waveguide structure, characterized in that: It includes a first metal strip array and a second metal strip array; wherein the strips are beam-like structures with rectangular cross-sections and extending in a straight direction; The first metal strip array and the second metal strip array are located between a first metal plate and a second metal plate that are stacked; a hollow groove is provided between the first metal plate and the second metal plate; the first metal strip array is arranged on both sides of the surface of the first metal plate corresponding to the hollow groove; the second metal strip array is arranged on both sides of the surface of the second metal plate corresponding to the hollow groove; The projection of the first metal strip array on either side of the hollow slot in a direction perpendicular to the first metal plate is connected to the projection of the second metal strip array on the corresponding side in a direction perpendicular to the first metal plate without overlapping each other; When an electromagnetic wave passes through the metasurface waveguide structure, the first metal plate, the second metal plate, the first metal strip array, and the second metal strip array confine the electromagnetic wave to propagate within the hollow slot.

2. The metasurface waveguide structure according to claim 1, characterized in that: The sum of the height of the first metal strip array in a direction perpendicular to the first metal plate and the height of the second metal strip array in a direction perpendicular to the second metal plate is equal to the distance between the opposite surfaces of the first metal plate and the second metal plate.

3. The metasurface waveguide structure according to claim 1, characterized in that: The first metal strip array includes first metal strips arranged in parallel; the second metal strip array includes second metal strips arranged in parallel; the width of the first metal strip in the arrangement direction is equal to the width of the second metal strip in the arrangement direction.

4. A millimeter wave MIMO slot waveguide array antenna based on the metasurface waveguide structure according to any one of claims 1 to 3, characterized in that: include: A first antenna plate, a second antenna plate, a third antenna plate, a fourth antenna plate and a fifth antenna plate stacked in sequence; The first antenna plate is provided with a first number of first through holes and a second number of second through holes; The second antenna plate is provided with the first number of third through holes and the second number of fourth through holes; the positions of the third through holes correspond one-to-one to the positions of the first through holes; and the positions of the fourth through holes correspond one-to-one to the positions of the second through holes; The first number of first supersurface waveguide structures is disposed between the second antenna plate and the third antenna plate; one end of the hollow groove of the first supersurface waveguide structure corresponds to the position of the third through hole one by one; The third antenna plate is provided with the first number of fifth through holes and the second number of sixth through holes; the fifth through holes correspond one-to-one to the positions of the other ends of the hollow slots of the first metasurface waveguide structure, and the sixth through holes correspond one-to-one to the positions of the fourth through holes; The second number of second supersurface waveguide structures is arranged between the third antenna plate and the fourth antenna plate; one end of the hollow groove of the second supersurface waveguide structure corresponds to the position of the sixth through hole one by one; The fourth antenna plate is provided with the first number of seventh through holes and the second number of eighth through holes; the positions of the seventh through holes correspond one-to-one to the positions of the fifth through holes; and the positions of the eighth through holes correspond one-to-one to the positions of the other ends of the hollow slots of the second metasurface waveguide structure; The first number of third metasurface waveguide structures and the second number of fourth metasurface waveguide structures are arranged between the fourth antenna plate and the fifth antenna plate; the middle part of the hollow groove of the third metasurface waveguide structure corresponds to the position of the seventh through hole one by one; the middle part of the hollow groove of the fourth metasurface waveguide structure corresponds to the position of the eighth through hole one by one; The fifth antenna board is provided with a ninth through hole array of the first number and a tenth through hole array of the second number; the ninth through hole array corresponds one-to-one with the position of the hollow slots of the third supersurface waveguide structure; the tenth through hole array corresponds one-to-one with the position of the hollow slots of the fourth supersurface waveguide structure.

5. The slot waveguide array antenna according to claim 4, characterized in that: A first groove is provided on the surface of the second antenna plate facing the third antenna plate, and the first supersurface waveguide structure is arranged inside the first groove.

6. The slot waveguide array antenna according to claim 4, characterized in that: A second groove is provided on the surface of the third antenna plate facing the fourth antenna plate, and the second metasurface waveguide structure is arranged inside the second groove.

7. The slot waveguide array antenna according to claim 4, characterized in that: A third groove is provided on the surface of the fifth antenna plate facing the fourth antenna plate, and the third metasurface waveguide structure is arranged inside the third groove.

8. The slot waveguide array antenna according to claim 4, characterized in that: A fourth groove is provided on the surface of the fifth antenna plate facing the fourth antenna plate, and the fourth metasurface waveguide structure is arranged inside the fourth groove.

9. The slot waveguide array antenna according to claim 4, characterized in that: The shapes of the first through hole, the second through hole, the third through hole, the fourth through hole, the fifth through hole, the sixth through hole, the seventh through hole, the eighth through hole, the ninth through hole and the tenth through hole are one or a combination of rectangular, elliptical, waist-shaped, T-shaped, cross-shaped and dumbbell-shaped.

10. The slot waveguide array antenna according to claim 4, characterized in that: The first quantity is 4; the second quantity is 4.

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