Choke groove structure

Abstract

The utility model discloses a choke groove structure, relates to choke groove technical field, the choke groove structure comprises a substrate, a bottom plate, a plurality of cover plate and a plurality of connecting portion, the substrate has a plurality of through hole groups, the plurality of through hole groups are arranged along the first direction at intervals, each through hole group comprises a plurality of through holes extending along the second direction, the through holes are formed in the base plate in a penetrating mode in the third direction, the bottom plate is arranged on one side of the base plate in the third direction and covers orifices of the through holes, and the cover plates are arranged on the other side of the base plate in the third direction at intervals in the first direction and correspond to the through hole sets respectively. Each cover plate is used for covering the orifices of the multiple through holes of the corresponding through hole group, each connecting part is arranged in one through hole, the two ends, in the third direction, of each connecting part are connected with the bottom plate and the corresponding cover plate respectively, and the bottom plate, the multiple cover plates and the multiple connecting parts are all made of conductive materials.

Description

Technical Field

[0001] This utility model relates to the field of choke groove technology, and in particular to a choke groove structure. Background Technology

[0002] Microstrip antennas have been widely used in millimeter-wave radar detection due to their small size, low profile, mature PCB manufacturing process, and high consistency.

[0003] In angular radar applications, the mainstream design uses wide-beam or ±45° beam-pointing antennas. These designs generate strong surface waves, which interfere with the normal antenna pattern and angle measurement accuracy. Currently, methods to deal with surface waves primarily employ EBG structures or the placement of parasitic antennas.

[0004] However, if an EBG structure is used to suppress surface waves, the EBG structure is smaller than 1 / 10 of the wavelength, requiring higher processing precision than an antenna. This places higher demands on PCB manufacturing processes in the millimeter-wave band. Furthermore, the small size of the EBG structure limits the operating bandwidth, making it unable to cover the entire millimeter-wave radar operating frequency band, thus limiting the surface wave suppression effect. If parasitic antennas are used to suppress surface waves, these antennas would increase the number of traces on the PCB by about 0.1 mm, increasing the risk of copper peeling or breakage on the PCB surface during production. Utility Model Content

[0005] The main purpose of this invention is to propose a choke groove structure, which aims to improve the existing surface wave suppression structures, which are complex in structure, small in size, and require high precision in manufacturing process.

[0006] To achieve the above objectives, the present invention proposes a choke groove structure, a substrate having multiple through-hole groups, the multiple through-hole groups being spaced apart along a first direction, each of the through-hole groups including multiple through holes extending along a second direction, and each of the through holes penetrating the substrate along a third direction.

[0007] A base plate is disposed on the third-side of the substrate and covers the openings of the plurality of through holes;

[0008] Multiple cover plates are spaced apart along a first direction on the other side of the substrate in a third direction, and are respectively disposed corresponding to multiple through-hole groups. Each cover plate is disposed to cover the opening of the multiple through holes in the corresponding through-hole group; and,

[0009] Multiple connecting parts are provided, each of the connecting parts is provided in one of the through holes, and the connecting parts are respectively connected to the base plate and the corresponding cover plate at both ends in the third direction;

[0010] The base plate, the plurality of cover plates, and the plurality of connecting parts are all made of conductive materials.

[0011] In one embodiment, each of the connecting portions includes a connecting layer plated on the wall of the corresponding through hole and connected to the base plate and the corresponding cover plate.

[0012] In one embodiment, each of the connecting parts includes a connecting post, which is inserted into the corresponding through hole, and the two ends of the connecting post in the third direction are respectively connected to the base plate and the corresponding cover plate.

[0013] In one embodiment, both ends of each of the cover plates protrude from the corresponding through-hole group in a first direction.

[0014] In one embodiment, one end of each cover plate protrudes from the corresponding through-hole group in a first direction, and the other end is flush with the corresponding through-hole group.

[0015] In one embodiment, the thickness of the substrate in the third direction is h, where h < λ / 10; and λ is the air wavelength.

[0016] In one embodiment, the length of each of the cover plates in the first direction is w1, where w1 = λ. g / 4-h / 2; where λ g The wavelength is the guide wave.

[0017] In one embodiment, within each of the through-hole groups, the distance between two through holes arranged adjacent to each other in the second direction is d1, where d1 < λ / 10;

[0018] The diameter of each through hole is d2, where d2 < λ / 10; and λ is the air wavelength.

[0019] In one embodiment, the distance between two adjacent cover plates in the first direction is w2, w2 < λ / 10; where λ is the air wavelength, or...

[0020] The distance between two adjacent cover plates in the first direction is w2, where w2 = λ g / 4+λ g ·N / 2, N=0,1,2……where λ g The wavelength is the guide wave.

[0021] In one embodiment, the substrate is made of epoxy resin, hydrocarbon resin, PPO resin, PTFE, and modified materials thereof.

[0022] In the technical solution of this utility model, the choke groove structure includes a substrate, a bottom plate, multiple cover plates, and multiple connecting parts. The substrate has multiple through-hole groups, which are spaced apart along a first direction. Each through-hole group includes multiple through holes extending along a second direction. Each through hole penetrates the substrate along a third direction. The bottom plate is disposed on one side of the substrate in the third direction and covers the openings of the multiple through holes. The multiple cover plates are spaced apart along the first direction on the other side of the substrate in the third direction and are respectively disposed corresponding to the multiple through-hole groups. Each cover plate is used to cover the openings of the multiple through holes in the corresponding through-hole group. Each of the multiple connecting parts is disposed in one of the through holes, and the two ends of the connecting part in the third direction are respectively connected to the bottom plate and the corresponding cover plate. The materials of the bottom plate, the multiple cover plates, and the multiple connecting parts all include conductive materials. With this configuration, the substrate provides a mounting base for other structures and serves as a waveguide medium. The cooperation of the base plate, multiple cover plates, and multiple connecting parts forms a choke slot. The surface input impedance of the choke slot is much greater than 0, which enables the suppression of surface waves and reduces the influence of surface waves on antenna measurements. The structure is simple, without complex isotropic designs, and is larger in size, while maintaining the same dimensional accuracy requirements as the antenna. The choke slot structure can be manufactured using ordinary PCB processes. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 A schematic diagram of an embodiment of the choke groove structure provided by this utility model;

[0025] Figure 2 for Figure 1 A partial cross-sectional schematic diagram of the choke structure in the middle;

[0026] Figure 3 for Figure 1 A schematic diagram of the surface input impedance of the choke structure in the diagram;

[0027] Figure 4 A schematic diagram of another embodiment of the choke groove structure provided by this utility model;

[0028] Figure 5 for Figure 4 A partial cross-sectional schematic diagram of the choke structure in the middle;

[0029] Figure 6 for Figure 4 A schematic diagram of the surface input impedance of the choke structure in the diagram.

[0030] Explanation of icon numbers:

[0031] 100. Choke structure; 1. Base plate; 2. Bottom plate; 3. Cover plate; 4. Connecting part; 41. Connecting layer; 42. Connecting column.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] This invention proposes a choke groove structure. It aims to improve upon existing surface wave suppression structures, which suffer from complex structures, small dimensions, and high manufacturing precision requirements.

[0037] Please see Figure 1 and 3In one embodiment of this utility model, the choke groove structure 100 includes a substrate 1, a bottom plate 2, a plurality of cover plates 3, and a plurality of connecting portions 4. The substrate 1 has a plurality of through-hole groups, which are spaced apart along a first direction. Each through-hole group includes a plurality of through holes extending along a second direction. Each through hole penetrates the substrate 1 along a third direction. The bottom plate 2 is disposed on one side of the substrate 1 in the third direction and covers the openings of the plurality of through holes. The plurality of cover plates 3 are spaced apart along the first direction on the other side of the substrate 1 in the third direction and are respectively disposed corresponding to the plurality of through-hole groups. Each cover plate 3 is used to cover the openings of the plurality of through holes in the corresponding through-hole group. Each of the plurality of connecting portions 4 is disposed in one of the through holes, and the two ends of the connecting portion 4 in the third direction are respectively connected to the bottom plate 2 and the corresponding cover plate 3. The materials of the bottom plate 2, the plurality of cover plates 3, and the plurality of connecting portions 4 all include conductive materials.

[0038] In the technical solution of this utility model, the choke groove structure 100 includes a substrate 1, a bottom plate 2, multiple cover plates 3, and multiple connecting parts 4. The substrate 1 has multiple through-hole groups, which are spaced apart along a first direction. Each through-hole group includes multiple through holes extending along a second direction. Each through hole penetrates the substrate 1 along a third direction. The bottom plate 2 is disposed on one side of the substrate 1 in the third direction and covers the openings of the multiple through holes. The multiple cover plates 3 are spaced apart along the first direction on the other side of the substrate 1 in the third direction and are respectively disposed corresponding to the multiple through-hole groups. Each cover plate 3 is used to cover the openings of the multiple through holes in the corresponding through-hole group. Each of the multiple connecting parts 4 is disposed in one of the through holes, and the two ends of the connecting part 4 in the third direction are respectively connected to the bottom plate 2 and the corresponding cover plate 3. The materials of the bottom plate 2, the multiple cover plates 3, and the multiple connecting parts 4 all include conductive materials. With this configuration, the substrate 1 provides a mounting base for other structures and serves as a waveguide medium. The cooperation of the base plate 2, multiple cover plates 3, and multiple connecting parts 4 forms a choke groove. The surface input impedance of the choke groove is much greater than 0, which enables the suppression of surface waves and reduces the influence of surface waves on antenna measurements. The structure is simple, without complex isotropic designs, and is larger in size, with the same dimensional accuracy requirements as the antenna. The choke groove structure 100 can be manufactured using ordinary PCB processes.

[0039] It should be noted that this utility model does not limit the specific structural form of the connecting part 4. For example, in one embodiment of this utility model, each connecting part 4 includes a connecting layer 41, which is plated on the hole wall of the corresponding through hole and connected to the bottom plate 2 and the corresponding cover plate 3. With this configuration, the connecting layer 41 is connected to the corresponding cover plate 3 and the bottom plate 2 at both ends in the third direction, so as to electrically connect the corresponding cover plate 3 and the bottom plate 2, thereby short-circuiting the corresponding cover plate 3 and the bottom plate 2, so as to ensure the surface wave suppression capability of the choke groove structure 100. At the same time, setting the connecting part 4 as the connecting layer 41 can further reduce the number of structural components of the choke groove structure 100 and reduce the manufacturing difficulty of the choke groove structure 100.

[0040] In another embodiment of this utility model, each of the connecting parts 4 includes a connecting post 42, which is inserted into the corresponding through hole, and the two ends of the connecting post 42 in the third direction are respectively connected to the base plate 2 and the corresponding cover plate 3. With this configuration, when the connecting part 4 is set as the connecting post 42, the connecting post 42 is inserted into the corresponding through hole, and the two ends in the third direction are respectively connected to the corresponding cover plate 3 and the base plate 2, thereby short-circuiting the corresponding cover plate 3 and the base plate 2. This also ensures the surface wave suppression capability of the choke groove structure 100. Furthermore, setting the connecting part 4 as the connecting post 42 further improves the connection stability between the connecting part 4 and the corresponding cover plate 3 and base plate 2, thereby further ensuring the surface wave suppression capability of the choke groove structure 100.

[0041] Of course, in other embodiments of this utility model, the connecting part 4 can also be configured as a connecting line or other structural form, as long as it is ensured that the connecting part 4 can short-circuit the corresponding cover plate 3 and the bottom plate 2. Specifically, in actual settings, it can be selected according to the requirements, and this utility model does not limit it.

[0042] Similarly, this utility model does not limit the specific materials of the base plate 2, the plurality of cover plates 3, and the plurality of connecting parts 4. In one embodiment of this utility model, the base plate 2, the plurality of cover plates 3, and the plurality of connecting parts 4 may be made of copper; in another embodiment of this utility model, the base plate 2, the plurality of cover plates 3, and the plurality of connecting parts 4 may also be made of silver; in yet another embodiment of this utility model, the base plate 2 and the plurality of cover plates 3 may be made of copper, and the plurality of connecting parts 4 may be made of silver.

[0043] In other embodiments of this utility model, the base plate 2, the plurality of cover plates 3 and the plurality of connecting parts 4 may also be made of iron or other conductive materials. It is only necessary to ensure that the base plate 2, the plurality of cover plates 3 and the plurality of connecting parts 4 are made of at least one of the various conductive materials. In actual installation, the materials can be selected according to the requirements.

[0044] Meanwhile, it is also necessary to further determine the dimensions of the substrate 1 in the third direction. In one embodiment of this utility model, with air wavelength as the condition, λ is the air wavelength, and the thickness of the substrate 1 in the third direction is h, where h < λ / 10.

[0045] It should also be noted that, in order to ensure the surface wave suppression capability of the choke structure 100, the length of the cover plate 3 in the first direction needs to be determined based on the thickness of the substrate 1 in the third direction. In a further embodiment of this utility model, taking the waveguide wavelength as a condition, λ g Given the waveguide wavelength, the length of each cover plate 3 in the first direction is w1, where w1 = λ. g / 4-h / 2.

[0046] Of course, this utility model does not limit the specific material of the substrate 1. In this utility model, the material of the substrate 1 includes epoxy resin, hydrocarbon resin, PPO resin, PTFE and its modified materials.

[0047] For example, in one embodiment of this invention, the substrate 1 can be made of epoxy resin; in another embodiment, the substrate 1 can be made of hydrocarbon resin; in other embodiments, the substrate 1 can also be made of PPO resin, PTFE and its modified materials, or other materials that can simultaneously ensure the support and resistance capabilities of the substrate 1. In actual implementation, the appropriate material can be selected based on requirements.

[0048] Furthermore, to ensure the choke structure 100's ability to confine surface waves, adjacent cover plates 3 are spaced apart. In this case, the present invention does not limit the specific form of the adjacent cover plates 3 to create the gap; for example, please refer to... Figure 1-2 In one embodiment of the present invention, one end of each cover plate 3 in a first direction protrudes from the corresponding through hole group, and the other end is flush with the corresponding through hole group.

[0049] Of course, this utility model does not limit the specific orientation of the end of the cover plate 3 that is protruding. In actual installation, it can be selected according to the requirements.

[0050] Please see Figure 4-5In another embodiment of this utility model, both ends of each cover plate 3 protrude beyond the corresponding through-hole group in the first direction. With this configuration, by adjusting the size of the two ends of the cover plate 3 protruding beyond the through-hole group in the first direction, adjacent cover plates 3 can also be spaced apart.

[0051] In this embodiment, the cover plate 3 and the through hole have various forms. For example, in a further embodiment of the present invention, the cover plate 3 includes two plate segments spaced apart in a first direction. The two plate segments are abutted against each other at their ends in the first direction, and the size of each plate segment in the first direction is at least greater than the radius of the through hole. The connecting part 4 includes two connecting members spaced apart in the first direction. The two connecting members are jointly disposed in the same through hole, and each connecting member is connected to one plate segment. In this way, both ends of the cover plate 3 in the first direction protrude from the corresponding through hole group.

[0052] In a further embodiment of this utility model, the connecting part 4 is connected to the middle part of the corresponding cover plate 3 in the first direction, and the size of the cover plate 3 in the first direction is larger than the size of the through hole in the first direction. In this way, both ends of the cover plate 3 in the first direction can protrude from the corresponding through hole group.

[0053] Of course, in order to further ensure the surface wave suppression capability of the choke structure 100, in this utility model, it is necessary to further limit the spacing between two adjacent cover plates 3 in the first direction. In one embodiment of this utility model, taking the air wavelength as a condition, λ is the air wavelength, and the spacing between two adjacent cover plates 3 in the first direction is w2, w2 < λ / 10.

[0054] In another embodiment of this utility model, λ is taken as the guide wave wavelength. g The wavelength of the guided wave is given by the distance between two adjacent cover plates 3 in the first direction, where w2 = λ. g / 4+λ g • N / 2, N = 0, 1, 2...

[0055] Furthermore, it is necessary to further limit the spacing between two adjacent through holes within the same through hole group, as well as the diameter of each through hole, so as to further ensure the surface wave suppression capability of the choke groove structure 100. In one embodiment of this utility model, taking the air wavelength as a condition, λ is the air wavelength, and in each through hole group, the spacing between two adjacent through holes arranged in the second direction is d1, d1 < λ / 10, and the diameter of each through hole is d2, d2 < λ / 10.

[0056] Please see Figure 1-2In one specific embodiment of this utility model, the substrate 1 is made of PTFE+glass fiber composite material with a dielectric constant of 3.6, and the operating center frequency of the choke structure 100 is 76.5GHz. At this time, the guided wave wavelength λ... g =2.07mm, the thickness h of the substrate 1 in the third direction is 0.1mm, the spacing d1 of two adjacent through holes in each through hole group in the second direction is 0.35mm, the diameter d2 of the through hole is 0.15mm, the thickness w1 of the cover plate 3 in the third direction is 0.035mm, the width w1 in the first direction is 0.454mm, and the spacing w2 between two adjacent cover plates 3 in the first direction is 0.52mm. With this configuration, the surface input impedance of the choke structure 100 is as follows: Figure 3 As shown, its input impedance is much greater than 0, which meets the design purpose of the choke.

[0057] Please see Figure 4-5 In another specific embodiment of this utility model, the substrate 1 is made of PTFE+glass fiber composite material with a dielectric constant of 3.6, and the operating center frequency of the choke structure 100 is 76.5GHz. At this time, the waveguide wavelength λ... g =2.07mm, the thickness of the substrate 1 in the third direction is h = 0.1mm, the spacing d1 = 0.35mm between two adjacent through holes in each through hole group in the second direction, the diameter of the through hole d2 = 0.15mm, the thickness of the cover plate 3 in the third direction is 0.035mm, and the width w1 = 0.477mm in the first direction. With this configuration, the surface input impedance of the choke structure 100 is as follows: Figure 6 As shown, its input impedance is also much greater than 0, which meets the design purpose of the choke.

[0058] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A flow constriction channel structure, characterized by, include: A substrate having a plurality of through-hole groups, the plurality of through-hole groups being spaced apart along a first direction, each of the through-hole groups including a plurality of through holes extending along a second direction, each of the through holes penetrating the substrate along a third direction; A base plate is disposed on the third-side of the substrate and covers the openings of the plurality of through holes; Multiple cover plates are spaced apart along a first direction on the other side of the substrate in a third direction, and are respectively disposed corresponding to multiple through-hole groups. Each cover plate is disposed to cover the opening of the multiple through holes in the corresponding through-hole group; and, Multiple connecting parts are provided, each of the connecting parts is provided in one of the through holes, and the connecting parts are respectively connected to the base plate and the corresponding cover plate at both ends in the third direction; The base plate, the plurality of cover plates, and the plurality of connecting parts are all made of conductive materials.

2. The flow channel structure of claim 1, wherein Each of the connecting parts includes a connecting layer, which is plated on the wall of the corresponding through hole and is disposed to connect the base plate and the corresponding cover plate.

3. The flow channel structure of claim 1, wherein Each of the connecting parts includes a connecting post, which is inserted into the corresponding through hole, and the two ends of the connecting post in the third direction are respectively connected to the base plate and the corresponding cover plate.

4. The flow channel structure according to any one of claims 1 to 3, wherein Each of the cover plates protrudes from both ends of the corresponding through-hole group in the first direction.

5. The choke groove structure as described in any one of claims 1 to 3, characterized in that, Each of the cover plates has one end protruding from the corresponding through hole group in a first direction, and the other end flush with the corresponding through hole group.

6. The flow channel structure of claim 1, wherein The thickness of the substrate in the third direction is h, where h < λ / 10; and λ is the air wavelength.

7. The flow channel structure of claim 6, wherein The length of each cover plate in the first direction is w1, where w1 = λ g / 4-h / 2; where λ g The wavelength is the guide wave.

8. The flow channel structure of claim 1, wherein Within each of the aforementioned through-hole groups, the distance between two adjacent through-holes arranged in the second direction is d1, where d1 < λ / 10; The diameter of each through hole is d2, where d2 < λ / 10; and λ is the air wavelength.

9. The flow channel structure of claim 1, wherein The distance between two adjacent cover plates in the first direction is w2, w2 < λ / 10; where λ is the air wavelength, or... The interval between two adjacent cover plates in the first direction is w2, w2 = λ g / 4 + λ g ·N / 2, N = 0, 1, 2, …, wherein λ g is the guided wave wavelength.

10. The flow channel structure of claim 1, wherein The substrate is made of epoxy resin, hydrocarbon resin, PPO resin, PTFE and their modified materials.

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