Waveguide antenna and radar system
By setting an isolation structure between the plates of the waveguide antenna, the problem of gap leakage caused by plate connection errors is solved, which improves radiation efficiency and signal strength, improves fluctuation, and reduces processing difficulty and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 立晟智能科技(成都)有限公司
- Filing Date
- 2025-06-30
- Publication Date
- 2026-06-26
Smart Images
Figure CN224418012U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of antenna technology, and in particular to a waveguide antenna and radar system. Background Technology
[0002] Waveguide antennas are an indispensable and important component in radar systems. They are devices that propagate and receive electromagnetic waves and determine the radar's detection direction.
[0003] In existing technologies, waveguide antennas have waveguide cavities, which are typically irregularly shaped. To facilitate the formation of the waveguide cavity, waveguide antennas are usually assembled from multiple plates. Since some errors inevitably occur when connecting the plates, gaps exist in the formed waveguide cavity except for the radiation port. This leads to electromagnetic waves leaking from the waveguide cavity through these gaps, resulting in energy leakage, lower radiation efficiency, and larger phase fluctuations in the waveguide antenna. Utility Model Content
[0004] The first objective of this invention is to provide a waveguide antenna to solve the technical problems of low radiation efficiency and large phase fluctuation in the prior art.
[0005] The second objective of this invention is to provide a radar system with high radiation efficiency, high signal strength, and low phase fluctuation.
[0006] Based on the above concept, the technical solution adopted by this utility model is as follows:
[0007] A waveguide antenna, wherein the waveguide antenna is provided with a waveguide cavity; the waveguide antenna includes:
[0008] The first plate body, the waveguide cavity includes a first cavity disposed in the first plate body;
[0009] The second plate is connected to the first plate, and the waveguide cavity includes a second cavity disposed in the second plate, the second cavity being in communication with the first cavity;
[0010] An isolation structure is disposed between the first plate and the second plate. The isolation structure includes a boss and a groove. The boss is disposed in one of the first plate and the second plate, and the groove is disposed in the other of the first plate and the second plate. At least a portion of the boss is located in the groove, and the boss and the groove together form a closed area. The connecting portion of the first cavity and the second cavity is located within the closed area.
[0011] In one embodiment, the orthographic projection of the first cavity onto the first plate along the thickness direction of the first plate is located within the enclosed area;
[0012] And / or, the orthogonal projection of the second cavity along the thickness direction of the second plate onto the second plate lies within the enclosed area.
[0013] In one embodiment, the isolation structure is annular; multiple isolation structures are provided, and the multiple isolation structures are arranged along the direction away from the waveguide cavity, with adjacent isolation structures spaced apart from each other.
[0014] In one embodiment, the connecting portion between the first cavity and the second cavity is spaced apart from the isolation structure.
[0015] In one embodiment, the sidewall of the boss facing the connecting portion abuts against the sidewall of the groove facing the connecting portion; and / or, the sidewall of the boss away from the connecting portion abuts against the sidewall of the groove away from the connecting portion; and / or, the top surface of the boss abuts against the bottom surface of the groove.
[0016] In one embodiment, the groove depth is greater than or equal to the height of the boss.
[0017] In one embodiment, the waveguide antenna further includes a plurality of radiating elements;
[0018] Multiple radiating units are disposed on the first plate, and the radiating units form radiating ports on the surface of the first plate away from the second plate, and the waveguide cavity forms a feed inlet on the surface of the second plate away from the first plate; or, multiple radiating units are disposed on the second plate, and the radiating units form radiating ports on the surface of the second plate away from the first plate, and the waveguide cavity forms a feed inlet on the surface of the first plate away from the second plate.
[0019] In one embodiment, the first cavity has a first communication port on the surface of the first plate facing the second plate, and the second cavity has a second communication port on the surface of the second plate facing the first plate, wherein the first communication port and the second communication port form a communication portion between the first cavity and the second cavity.
[0020] In one embodiment, the boss is annular.
[0021] Radar system, including the waveguide antenna as described above.
[0022] The beneficial effects of this utility model are:
[0023] The waveguide antenna includes a first plate and a second plate connected together. The waveguide cavity includes a first cavity disposed on the first plate and a second cavity disposed on the second plate, which facilitates the formation of the waveguide cavity and reduces the processing difficulty of the waveguide antenna. The isolation structure includes a boss and a groove, with at least a portion of the boss placed in the groove to enclose a closed area. The connecting portion of the first cavity and the second cavity is located within the closed area, so that the cooperation of the boss and the groove can form an effective electromagnetic barrier outside the connecting portion, effectively reducing the amount of electromagnetic waves leaking through the first plate and the second plate, thereby reducing the amount of electromagnetic energy escaping. This ensures that the electromagnetic waves escaping through the gap between the first plate and the second plate have little or no leakage, guaranteeing the signal strength of the waveguide antenna, thereby ensuring the signal stability of the waveguide antenna, improving the phase fluctuation of the waveguide antenna, and also improving the zero-degree gain.
[0024] Furthermore, the protrusions and grooves are only provided on the first and second plates, resulting in a simpler structure that does not require large-scale modifications to the overall structure of the waveguide antenna. This reduces the difficulty and cost of manufacturing, thereby achieving good economic benefits and application value.
[0025] The radar system provided by this invention has high radiation efficiency and high signal strength. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model 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 content of the embodiments of this utility model and these drawings without creative effort.
[0027] Figure 1 This is a schematic diagram of the waveguide antenna provided in one embodiment of the present invention;
[0028] Figure 2 This is a top view of a waveguide antenna provided in one embodiment of the present invention;
[0029] Figure 3 This is a first exploded view of a waveguide antenna provided in an embodiment of the present invention;
[0030] Figure 4 This is a second exploded view of a waveguide antenna provided in one embodiment of the present invention;
[0031] Figure 5 This is a first cross-sectional view of a waveguide antenna provided in an embodiment of the present invention;
[0032] Figure 6 This is a second cross-sectional view of a waveguide antenna provided in an embodiment of the present invention;
[0033] Figure 7 This is a schematic diagram of the structure of the second plate provided in one embodiment of the present invention;
[0034] Figure 8 This is a schematic diagram of the structure of the first plate body provided in an embodiment of the present invention;
[0035] Figure 9 This is a schematic diagram of a waveguide antenna with multiple isolation structures provided in one embodiment of the present invention;
[0036] Figure 10 This invention provides a radiation pattern for a single waveguide antenna with different numbers of isolation structures added, according to one embodiment of the present invention.
[0037] Figure 11 This is a phase diagram of a single waveguide antenna with different numbers of isolation structures provided in one embodiment of the present invention.
[0038] In the picture:
[0039] 1. Waveguide cavity; 11. First cavity; 111. First connecting port; 12. Second cavity; 121. Second connecting port; 13. Feed inlet; 2. First plate; 3. Second plate; 4. Isolation structure; 41. Boss; 42. Groove; 43. Enclosed area; 5. Radiation unit; 51. Radiation port. Detailed Implementation
[0040] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.
[0041] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.
[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0043] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0044] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.
[0045] In the description of this embodiment, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., are based on the orientation or positional relationships shown in the accompanying drawings and are only for ease of description and simplification of operation. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are merely used for distinction in description and have no special meaning.
[0046] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or it can be located in between the component.
[0047] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0048] This embodiment provides a waveguide antenna that has high radiation efficiency and strong signal strength.
[0049] For example, such as Figure 2 As shown, the waveguide antenna is provided with a waveguide cavity 1, which is used for electromagnetic wave propagation. Furthermore, as... Figure 1 As shown, the waveguide antenna includes a first plate 2, a second plate 3, and an isolation structure 4.
[0050] The first plate 2 and the second plate 3 are connected. For example, the first plate 2 and the second plate 3 are arranged parallel to each other and connected in a surface-to-surface contact manner, and the first plate 2 and the second plate 3 cooperate to form a waveguide cavity 1. The waveguide cavity 1 includes a first cavity 11 disposed in the first plate 2 and a second cavity 12 disposed in the second plate 3. The first cavity 11 and the second cavity 12 are connected, so that electromagnetic waves can propagate in the first cavity 11 and the second cavity 12. It should be noted that due to manufacturing errors, there may be gaps between the first plate 2 and the second plate 3.
[0051] like Figure 3 and Figure 4 As shown, in this embodiment, the isolation structure 4 is disposed between the first plate 2 and the second plate 3, and the isolation structure 4 includes a boss 41 and a groove 42. The boss 41 is disposed on one of the first plate 2 and the second plate 3, and the groove 42 is disposed on the other of the first plate 2 and the second plate 3. For example, in this embodiment... Figure 3 and Figure 4 The example given shows a first plate 2 with a boss 41 and a second plate 3 with a groove 42. In other embodiments, the first plate 2 may also have a groove 42 and the second plate 3 may have a boss 41; this embodiment does not limit this. It should be noted that the surface of the first plate 2 facing the second plate 3 has a boss 41 or a groove 42, and the surface of the second plate 3 facing the first plate 2 has a boss 41 or a groove 42.
[0052] In this embodiment, at least a portion of the boss 41 is located in the groove 42. This arrangement allows the first plate 2 and the second plate 3 to be positioned and assembled via the cooperating boss 41 and groove 42, reducing the risk of misalignment during assembly. Furthermore, the boss 41 forms an electromagnetic barrier, reducing magnetic leakage.
[0053] like Figure 2 As shown, the boss 41 and the groove 42 together form a closed region 43, and the connecting portion of the first cavity 11 and the second cavity 12 is located within the closed region 43. In some optional embodiments, the boss 41 and the groove 42 forming a closed region 43 may mean that both the boss 41 and the groove 42 are annular. Furthermore, the closed region 43 may mean that it is closed at least in a direction perpendicular to the first plate 2. In some optional embodiments, the closed region 43 may be a three-dimensional region, with the height of the closed region 43 being the height of the boss 41, the length of the closed region 43 being the length of the boss 41, and the width of the closed region 43 being the width of the boss 41.
[0054] In this embodiment, as Figure 3 As shown, boss 41 is a rectangular ring structure.
[0055] In other embodiments, the boss 41 can also be other polygonal ring structures (such as triangular ring structures, trapezoidal ring structures, etc.), circular ring structures, elliptical ring structures, fan-shaped ring structures, and other closed shapes. The specific shape of the boss 41 can be flexibly adjusted according to actual needs, and this embodiment does not limit the shape of the boss 41.
[0056] In this embodiment, the shape of the groove 42 matches the shape of the boss 41.
[0057] By setting up the enclosed area 43, electromagnetic waves leak from the connecting part formed by the first cavity 11 and the second cavity 12 into the gap between the first plate 2 and the second plate 3. When the electromagnetic waves propagate in any direction perpendicular to the thickness direction of the first plate 2, they can be blocked by the boss 41, thereby reducing the leakage of electromagnetic waves, reducing the loss of energy, further improving the radiation efficiency of the waveguide antenna, making the waveguide antenna have a stronger signal strength, and reducing the overall phase fluctuation of the waveguide antenna.
[0058] The waveguide antenna provided in this embodiment includes a first plate 2 and a second plate 3 connected together. The waveguide cavity 1 includes a first cavity 11 disposed on the first plate 2 and a second cavity 12 disposed on the second plate 3, which facilitates the formation of the waveguide cavity 1 and reduces the processing difficulty of the waveguide antenna. The isolation structure 4 includes a boss 41 and a groove 42. When the first plate 2 and the second plate 3 are connected, the boss 41 is placed in the groove 42 to form a closed area 43. The connecting part of the first cavity 11 and the second cavity 12 is located in the closed area 43, so that the cooperation of the boss 41 and the groove 42 can form an effective electromagnetic barrier outside the connecting part, effectively reducing the amount of electromagnetic waves leaking through the first plate 2 and the second plate 3, thereby reducing the amount of electromagnetic energy escaping. This ensures that the electromagnetic waves escaping through the gap between the first plate 2 and the second plate 3 have little or no leakage, thus ensuring the signal strength of the waveguide antenna, thereby ensuring the signal stability of the waveguide antenna, improving the phase fluctuation of the waveguide antenna, and also improving the zero-degree gain.
[0059] Furthermore, the waveguide antenna provided in this embodiment only has protrusions 41 and grooves 42 on the first plate 2 and the second plate 3, which is relatively simple in structure. It does not require large-scale modification of the overall structure of the waveguide antenna, which reduces the processing difficulty and cost, and thus has good economic benefits and application value.
[0060] It should be noted that "at least a portion of the boss 41 is located in the groove 42" can be understood as at least a portion of the boss 41 in the height direction being located in the groove 42. For example, if the entire boss 41 is located in the groove 42, that is, the boss 41 is entirely located in the groove 42, then the boss 41 does not have any portion located outside the groove 42. In this case, the gap between the first plate 2 and the second plate 3 is small, so that the arrangement of the boss 41 will not affect the surface contact between the first plate 2 and the second plate 3, thereby reducing the amount of electromagnetic waves leaking between the first plate 2 and the second plate 3.
[0061] In some alternative embodiments, such as Figure 8 As shown, the first cavity 11 has a first communication port 111 on the surface of the first plate 2 facing the second plate 3, as... Figure 7 As shown, the second cavity 12 has a second communication port 121 on the surface of the second plate 3 facing the first plate 2. The first communication port 111 and the second communication port 121 are interconnected to form a communication portion between the first cavity 11 and the second cavity 12. Electromagnetic waves are propagated between the first cavity 11 and the second cavity 12 through the first communication port 111 and the second communication port 121.
[0062] In at least one embodiment, the connecting portion of the first cavity 11 and the second cavity 12 is spaced apart from the isolation structure 4, that is, both the first connecting port 111 and the second connecting port 121 are spaced apart from the isolation structure 4. This arrangement can prevent the isolation structure 4 from interfering with the electromagnetic waves at the first connecting port 111 and the second connecting port 121, thereby avoiding the influence on the propagation of electromagnetic waves in the waveguide cavity 1.
[0063] For example, when the boss 41 is provided on the first plate 2, the boss 41 is spaced apart from the first connecting port 111. When the boss 41 is provided on the second plate 3, the boss 41 is spaced apart from the second connecting port 121. Similarly, when the groove 42 is provided on the first plate 2, the groove 42 is spaced apart from the first connecting port 111. When the groove 42 is provided on the second plate 3, the groove 42 is spaced apart from the second connecting port 121.
[0064] In at least one implementation, such as Figure 3 As shown, the orthographic projection of the first cavity 11 along the thickness direction of the first plate 2 onto the first plate 2 is located within the closed region 43. It is understood that the orthographic projection of the first cavity 11 along the thickness direction of the first plate 2 onto the first plate 2 may also be partially located within the closed region 43; this embodiment does not limit this.
[0065] In one embodiment, the orthographic projection of the second cavity 12 onto the second plate 3 along the thickness direction of the second plate 3 is located within the closed region 43. It is understood that the orthographic projection of the second cavity 12 onto the second plate 3 along the thickness direction of the second plate 3 may also be partially located within the closed region 43; this embodiment does not limit this.
[0066] In one embodiment, such as Figure 3 As shown, the isolation structure 4 can be provided, that is, both the boss 41 and the groove 42 are provided. In this case, the specific structure of the waveguide antenna is relatively simple and easy to manufacture.
[0067] In other embodiments, such as Figure 9 As shown, the isolation structure 4 is annular, and multiple isolation structures 4 can be provided, arranged along the direction away from the waveguide cavity 1, with adjacent isolation structures 4 spaced apart. With this arrangement, multiple protrusions 41 can be provided, with multiple annular protrusions 41 spaced apart sequentially along the direction away from the waveguide cavity 1. In this case, multiple grooves 42 are provided in a one-to-one correspondence with the protrusions 41, with each protrusion 41 placed in its corresponding groove 42. By providing multiple isolation structures 4, energy escape can be further reduced, thereby further improving the radiation efficiency of the waveguide antenna, ensuring signal strength, and simultaneously improving the phase fluctuation of the waveguide antenna and increasing zero-degree gain.
[0068] like Figure 9 As shown, in two adjacent isolation structures 4, the closed area 43 formed by the boss 41 and the groove 42 of the isolation structure 4 closer to the waveguide cavity 1 is located within the closed area 43 formed by the boss 41 and the groove 42 of the isolation structure 4 farther from the waveguide cavity 1.
[0069] In one embodiment, the multiple isolation structures 4 can be arranged concentrically. In this case, the waveguide antenna structure is more regular, and it is also easier to process and manufacture the multiple isolation structures 4. Of course, it is understood that the multiple isolation structures 4 can also be arranged eccentrically, and this embodiment does not limit this.
[0070] In some optional embodiments, when the boss 41 is provided on the first plate 2, the boss 41 and the first plate 2 are an integral structure. This improves the integrity and connection strength of the boss 41 and the first plate 2, reduces the risk of separation, and also facilitates the processing and manufacturing of the boss 41, allowing the first plate 2 and the boss 41 to be formed simultaneously through machine tool processing or other methods.
[0071] Similarly, when the boss 41 is provided on the second plate 3, the boss 41 and the second plate 3 are an integral structure.
[0072] To improve the shielding effect of the mating boss 41 and groove 42 on electromagnetic waves, in this embodiment, the sidewall of the boss 41 facing the enclosed region 43 abuts against the sidewall of the groove 42 facing the enclosed region 43. The sidewall of the boss 41 away from the enclosed region 43 abuts against the sidewall of the groove 42 away from the enclosed region 43. With this arrangement, there is a very small gap or no gap between the sidewall of the boss 41 and the sidewall of the groove 42. This prevents electromagnetic waves propagating through the gap between the first plate 2 and the second plate 3 from re-entering the space between the boss 41 and the groove 42. Instead, the leaked energy is redistributed under the guidance of the boss 41 and the groove 42, thus reducing energy leakage between the first plate 2 and the second plate 3.
[0073] In at least one embodiment, the top surface of the boss 41 abuts against the bottom surface of the groove 42, and there is a very small gap or no gap between the top surface of the boss 41 and the bottom surface of the groove 42, so that even if there is a gap between the side wall of the boss 41 and the side wall of the groove 42, electromagnetic waves will not leak to the space between the top surface of the boss 41 and the bottom surface of the groove 42, thereby effectively reducing the energy escape from between the first plate 2 and the second plate 3.
[0074] In one embodiment, the groove depth of the groove 42 is greater than the height of the boss 41. With this configuration, the boss 41 can be completely located in the groove 42, so that the configuration of the boss 41 and the groove 42 does not affect the fit between the first plate 2 and the second plate 3, thereby making the gap between the first plate 2 and the second plate 3 smaller, so as to reduce the leakage of electromagnetic waves.
[0075] In other embodiments, the groove depth of the groove 42 can also be equal to the height of the boss 41, which can also make the first plate 2 and the second plate 3 fit together better.
[0076] In at least one implementation, such as Figure 2 As shown, the waveguide antenna also includes multiple radiating elements 5, which are disposed on the second plate 3. Furthermore, the radiating elements 5 form radiating openings 51 on the surface of the second plate 3 opposite to the first plate 2, as shown... Figure 4 As shown, the waveguide cavity 1 forms a feed inlet 13 on the surface of the first plate 2 facing away from the second plate 3. Electromagnetic waves in the second cavity 12 of the second plate 3 are radiated out through the radiation unit 5 and the radiation port 51, or electromagnetic waves received by the radiation port 51 are propagated into the second cavity 12 through the radiation unit 5.
[0077] In other alternative embodiments, the radiation unit 5 may also be disposed on the first plate 2. In this case, the radiation unit 5 forms a radiation port 51 on the surface of the first plate 2 facing away from the second plate 3, and the waveguide cavity 1 forms a feed port 13 on the surface of the second plate 3 facing away from the first plate 2.
[0078] For example, the waveguide antenna in this embodiment has a double-layer plate structure, such as... Figure 1 , Figure 7 and Figure 8 As shown, the waveguide antenna in this embodiment includes a first plate 2 and a second plate 3. The first plate 2 has a boss 41 on the side facing the second plate 3, and the second plate 3 has a groove 42 on the side facing the first plate 2.
[0079] Optionally, the waveguide antenna can also be a multi-layer board structure, which is not limited in this embodiment.
[0080] It should be noted that the first plate 2 and the second plate 3 in this embodiment are made of materials commonly used in antennas in related technologies. For example, the first plate 2 and the second plate 3 are made of metal.
[0081] This embodiment also provides a radar system, including the waveguide antenna described above. The radar system provided in this embodiment has strong signal strength and high radiation efficiency.
[0082] The radar system in this embodiment can be applied to vehicles or other products, but this embodiment does not limit it.
[0083] like Figure 10 As shown, this embodiment provides a radiation pattern of a single waveguide antenna with different numbers of isolation structures 4. The horizontal axis represents the observation angle in degrees, and the vertical axis represents the gain value in dB. The solid line in the figure represents the curve obtained by testing when there is no gap between the first plate 2 and the second plate 3 (the theoretical state). The dotted line in the figure represents the curve obtained by testing when there is a 0.1mm gap between the first plate 2 and the second plate 3, but the first plate 2 does not have a protrusion 41. The short dashed line in the figure represents the radiation pattern obtained by adding different numbers of isolation structures 41 to a single waveguide antenna. Figure 1 The curve obtained from the structural test shown is for a configuration where there is a 0.1mm gap between the first plate 2 and the second plate 3, and a set of isolation structures 4 are provided. The long dashed line in the figure represents the curve obtained when there is a 0.1mm gap between the first plate 2 and the second plate 3, and multiple sets of isolation structures 4 are provided. From Figure 10 As can be seen, after adding the isolation structure 4 between the first plate 2 and the second plate 3, the waveguide antenna has the maximum gain near 0°, and increasing the number of isolation structures 4 further improves the gain at 0°.
[0084] like Figure 11As shown, this embodiment provides a phase diagram of a single waveguide antenna with different numbers of isolation structures 4 added. The horizontal axis represents the observation angle in degrees, and the vertical axis represents the phase difference in degrees. The solid line in the diagram represents the curve obtained when there is no gap between the first plate 2 and the second plate 3 (the theoretical state). The dotted line in the diagram represents the curve obtained when there is a 0.1mm gap between the first plate 2 and the second plate 3, but the first plate 2 does not have a protrusion 41. The short dashed line in the diagram represents the curve obtained according to... Figure 1 The curve obtained from the structural test shown is for a configuration where there is a 0.1mm gap between the first plate 2 and the second plate 3, and a set of isolation structures 4 are provided. The long dashed line in the figure represents the curve obtained when there is a 0.1mm gap between the first plate 2 and the second plate 3, and multiple sets of isolation structures 4 are provided. From Figure 11 As can be seen, after adding the isolation structure 4 between the first plate 2 and the second plate 3, the overall phase fluctuation of the waveguide antenna is reduced, remaining within ±10°. Furthermore, the phase fluctuation of the waveguide antenna is minimal within ±40° horizontally, showing significant phase improvement, which is beneficial for improving the measurement and communication performance. Increasing the number of isolation structures 4 further enhances the phase improvement effect.
[0085] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.
Claims
1. A waveguide antenna, characterized in that, The waveguide antenna is provided with a waveguide cavity; the waveguide antenna includes: The first plate body, the waveguide cavity includes a first cavity disposed in the first plate body; The second plate is connected to the first plate, and the waveguide cavity includes a second cavity disposed in the second plate, the second cavity being in communication with the first cavity; An isolation structure is disposed between the first plate and the second plate. The isolation structure includes a boss and a groove. The boss is disposed in one of the first plate and the second plate, and the groove is disposed in the other of the first plate and the second plate. At least a portion of the boss is located in the groove, and the boss and the groove together form a closed area. The connecting portion of the first cavity and the second cavity is located within the closed area.
2. The waveguide antenna according to claim 1, characterized in that, The orthographic projection of the first cavity along the thickness direction of the first plate onto the first plate is located within the enclosed area; And / or, the orthogonal projection of the second cavity along the thickness direction of the second plate onto the second plate lies within the enclosed area.
3. The waveguide antenna according to claim 1, characterized in that, The isolation structure is ring-shaped; multiple isolation structures are provided, and the multiple isolation structures are arranged along the direction away from the waveguide cavity, with adjacent isolation structures spaced apart from each other.
4. The waveguide antenna according to claim 1, characterized in that, The connecting portion between the first cavity and the second cavity is spaced apart from the isolation structure.
5. The waveguide antenna according to claim 1, characterized in that, The sidewall of the protrusion facing the enclosed area abuts against the sidewall of the groove facing the enclosed area; And / or, the sidewall of the boss facing away from the enclosed area abuts against the sidewall of the groove facing away from the enclosed area; And / or, the top surface of the boss abuts against the bottom surface of the groove.
6. The waveguide antenna according to claim 1, characterized in that, The groove depth is greater than or equal to the height of the boss.
7. The waveguide antenna according to claim 1, characterized in that, The waveguide antenna also includes multiple radiating elements; Multiple radiating units are disposed on the first plate, and the radiating units form radiating ports on the surface of the first plate away from the second plate, and the waveguide cavity forms a feed inlet on the surface of the second plate away from the first plate; or, multiple radiating units are disposed on the second plate, and the radiating units form radiating ports on the surface of the second plate away from the first plate, and the waveguide cavity forms a feed inlet on the surface of the first plate away from the second plate.
8. The waveguide antenna according to claim 1, characterized in that, The first cavity has a first communication port on the surface of the first plate facing the second plate, and the second cavity has a second communication port on the surface of the second plate facing the first plate. The first communication port and the second communication port form a communication portion between the first cavity and the second cavity.
9. The waveguide antenna according to claim 1, characterized in that, The boss is ring-shaped.
10. A radar system, characterized in that, Including the waveguide antenna as described in any one of claims 1-9.