Radio frequency unit and radar assembly

Abstract

The application discloses a radio frequency unit and a radar assembly. A first waveguide opening and a separation groove are arranged on a radiation surface, and the separation groove is arranged around the first waveguide opening. Thus, the separation groove separates the radiation surface into a separation area and a radiation area, and the first waveguide opening is located in the radiation area. The electric field and current distribution between the first waveguide openings in the separation groove are improved, the electromagnetic signals between multiple radio frequency units are prevented from interfering with each other at a near-field position, and the directivity of a main lobe beam of the radar assembly is improved.

Description

Technical Field

[0001] This application relates to the field of radar technology, and more particularly to a radio frequency unit and radar assembly. Background Technology

[0002] Waveguide antennas transmit or receive electromagnetic signals through multiple sets of waveguide ports. The close proximity of these ports reduces the antenna's isolation. Mutual interference between these ports leads to increased phase fluctuations and decreased radar detection accuracy. Therefore, improving the isolation between the multiple waveguide ports and reducing phase fluctuations is a problem that needs to be solved. Utility Model Content

[0003] In view of this, this application provides a radio frequency unit and a radar assembly, which uses isolation slots to separate each group of first waveguide ports in order to reduce mutual interference between two adjacent radio frequency units and phase fluctuations of the radar assembly.

[0004] According to a first aspect of this application, a radio frequency unit is provided, the radio frequency unit comprising:

[0005] The main body has a waveguide cavity and a radiating surface, and the radiating surface has an isolation groove.

[0006] The isolation groove separates the radiating surface to form an isolation area and a radiating area. The radiating area has a first waveguide port, which is connected to the waveguide cavity. The isolation groove is arranged around the first waveguide port.

[0007] Furthermore, the number of the first waveguide ports is multiple;

[0008] The isolation groove has a first side, a second side, and a bottom surface located between the first side and the second side. The first side is disposed opposite to the second side, and the first side surrounds a plurality of first waveguide ports and is opposite to the plurality of first waveguide ports.

[0009] Furthermore, the depth of the isolation groove remains consistent along its extension direction.

[0010] Furthermore, the extension direction of the isolation groove includes two first sections and two second sections, the ends of the two first sections are connected by the two second sections, and the first sections are located on opposite sides of the two second sections.

[0011] The isolation groove includes two first protrusions corresponding to the two second intervals respectively. The first protrusions protrude from the bottom surface of the corresponding second interval, and the top surface of the first protrusion is lower than the radiation surface. The first protrusions extend parallel to the first interval.

[0012] Furthermore, the plurality of first waveguide ports are arranged at linear intervals;

[0013] The first interval extends along the arrangement direction of the plurality of first waveguide ports, the lengths of the two first intervals are the same, the lengths of the two second intervals are the same, and the length of the first interval is greater than that of the second interval.

[0014] Furthermore, the isolation groove also includes two second protrusions corresponding to the two first intervals respectively. The second protrusions protrude from the bottom surface of the corresponding first interval, and the top surface of the second protrusions is lower than the radiation surface.

[0015] Along the length of the second protrusion, both ends of the second protrusion extend toward the two third sides, and the two end faces of the second protrusion are respectively aligned with the first sides of the two second intervals.

[0016] Furthermore, the isolation groove also includes two third protrusions corresponding to the two second intervals respectively. The third protrusions protrude from the bottom surface of the corresponding first interval, and the top surface of the second protrusion is lower than the radiation surface.

[0017] Along the length of the third protrusion, the two end faces of the third protrusion are aligned with the two end faces of the corresponding two second protrusions. Along the width of the third protrusion, one side of the third protrusion is connected to the first side, and the other side is connected to one side of the corresponding second protrusion. The side of the second protrusion away from the third protrusion is connected to the second side.

[0018] Furthermore, the height of the second protrusion is the same as the height of the first protrusion, and the second protrusion is higher than the third protrusion.

[0019] Furthermore, both the first interval and the second interval extend in a straight line and are perpendicularly connected;

[0020] The depth of the isolation groove is configured as H and the width is configured as W, where H ≤ (λ / 4), W ranges from (λ / 4) ± 0.2 mm, and λ is the operating wavelength.

[0021] Secondly, this application also provides a radar assembly, the radar assembly comprising:

[0022] According to the radio frequency unit described in the first aspect above, there are multiple radio frequency units, the first waveguide ports of the multiple radio frequency units face the same side, and the multiple radio frequency units constitute a transmitting unit and / or a receiving unit, and the multiple isolation slots are spaced apart.

[0023] The radio frequency unit and radar assembly of this application have a first waveguide port and an isolation groove formed on the radiating surface, with the isolation groove surrounding the first waveguide port. Thus, the isolation groove divides the radiating surface into an isolation zone and a radiating zone, with the first waveguide port located in the radiating zone. This improves the electric field and current distribution between the first waveguide ports within the isolation groove, avoids electromagnetic signal interference between multiple radio frequency units in the near field, and helps improve the directivity of the radar assembly's main lobe beam. Attached Figure Description

[0024] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

[0025] Figure 1 This is a schematic diagram of the structure of the radio frequency unit provided in the first embodiment of the present invention;

[0026] Figure 2 This is an exploded view of the radio frequency unit provided in the first embodiment of this utility model;

[0027] Figure 3 This is a schematic diagram of one side of the radio frequency unit provided in the second embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the other side of the radio frequency unit provided in the second embodiment of this utility model;

[0029] Figure 5 This is a structural schematic diagram of one side of the radio frequency unit provided in the third embodiment of this utility model;

[0030] Figure 6 This is a schematic diagram of the structure of the radio frequency unit on the other side of the third embodiment of this utility model;

[0031] Figure 7 yes Figure 6 Schematic diagram of the cross section at point AA;

[0032] Figure 8 This is a structural schematic diagram of one side of the radio frequency unit provided in the fourth embodiment of this utility model;

[0033] Figure 9 This is a schematic diagram of the structure of the radio frequency unit on the other side of the fourth embodiment of this utility model;

[0034] Figure 10 yes Figure 9 Schematic diagram of the cross section at point BB;

[0035] Figure 11 This is a schematic diagram of the radar component according to an embodiment of the present invention;

[0036] Figure 12This is a structural schematic diagram of the vehicle according to an embodiment of the present utility model;

[0037] Figure 13 This is a schematic diagram of the phase angle changes in the first, second, and third embodiments of this utility model;

[0038] Figure 14 These are schematic diagrams showing the orientation of the first, second, and third embodiments of this utility model;

[0039] Figure 15 These are schematic diagrams illustrating the phase angle changes in the first, third, and fourth embodiments of this utility model;

[0040] Figure 16 These are schematic diagrams showing the orientation of the first, third, and fourth embodiments of this utility model;

[0041] Figure 17 This is a schematic diagram showing the phase angle variation of the radio frequency unit in the pitch direction at different depths of the isolation groove in the pitch direction.

[0042] Figure 18 This is a schematic diagram showing the different depths of the isolation groove in the pitch direction of the radio frequency unit of this utility model embodiment;

[0043] Figure 19 This is a schematic diagram showing the phase angle variation of the radio frequency unit in this embodiment of the invention at different depths of the isolation groove in the horizontal direction;

[0044] Figure 20 This is a schematic diagram showing the different depths of the isolation groove in the horizontal direction of the radio frequency unit according to an embodiment of the present invention;

[0045] Figure 21 This is a schematic diagram showing the phase angle variation of the radio frequency unit in the pitch direction corresponding to different widths of the isolation slot in the pitch direction;

[0046] Figure 22 This is a schematic diagram showing the phase angle variation of the radio frequency unit in the horizontal direction with different widths of the isolation slot in the horizontal direction, according to an embodiment of this utility model.

[0047] Explanation of reference numerals in the attached figures:

[0048] 1-Main body;

[0049] 11-First subject; 12-Second subject;

[0050] 2-Waveguide cavity;

[0051] 31-First waveguide port; 32-Second waveguide port; 33-Radiating surface; 331-Radiating area; 332-Isolation area;

[0052] 4-Isolation groove;

[0053] 41-First side view; 42-Second side view; 43-Bottom surface; 44-Third side view;

[0054] 51 - First interval; 52 - Second interval;

[0055] 61 - First convex strip; 62 - Second convex strip; 63 - Third convex strip;

[0056] 71-Transmitting unit; 72-Receiving unit. Detailed Implementation

[0057] The present invention will now be described based on embodiments, but it is not limited to these embodiments. In the following detailed description of the present invention, certain specific details are described in detail. Those skilled in the art will fully understand the present invention even without these details. To avoid obscuring the essence of the present invention, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0058] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0059] Unless the context explicitly requires it, words such as "including" or "contains" throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to".

[0060] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0061] Unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0062] For ease of explanation, spatially related terms such as “inside,” “outside,” “below,” “below,” “lower,” “above,” “upper,” etc., are used herein to describe the relationship between one element or feature illustrated in the figure and another. It will be understood that spatially related terms may be intended to encompass different orientations of the device in use or operation besides those depicted in the figure. For example, if the device in the figure is flipped, an element described as “below” or “below” another element or feature would then be positioned “above” that other element or feature. Thus, the exemplified term “below” can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially related descriptive terms used herein should be interpreted accordingly.

[0063] Figure 1 This is a schematic diagram of the radio frequency unit provided in the first embodiment. Figure 2 This is an exploded view of the radio frequency unit provided in the first embodiment.

[0064] In some implementations, such as Figures 1-2 As shown, the radio frequency unit in this embodiment includes a main body 1. The main body 1 includes a first main body 11 and a second main body 12. The first main body 11 and the second main body 12 each have grooves on opposite sides. When the first main body 11 and the second main body 12 are assembled together, the two grooves engage to form a waveguide cavity 2. The first main body 11 has a radiating surface 33. A plurality of first waveguide ports 31 are provided on the radiating surface 33, and the second main body 12 is provided with second waveguide ports 32. Electromagnetic signals can enter the waveguide cavity 2 from the second waveguide ports 32 and radiate electromagnetic waves outward from the plurality of first waveguide ports 31.

[0065] Figure 3 and Figure 4 This is a schematic diagram of the radio frequency unit provided in the second embodiment. Figure 5 and Figure 6 This is a schematic diagram of the radio frequency unit provided in the third embodiment. Figure 7 yes Figure 6 Schematic diagram of cross-section at point AA. Figure 8 and Figure 9 This is a schematic diagram of the radio frequency unit provided in the fourth embodiment. Figure 10 yes Figure 9 A cross-sectional view at point BB. Figures 3-6 and Figures 8-9 In the middle, the inner surface of the isolation groove 4 is shown with a cross-section line, which is aligned with the direction of the radiation surface 33. Figure 7 and Figure 8 The inner surface of the central isolation groove 4 is shown with thick solid lines.

[0066] Further reference Figures 3-10As shown, an isolation groove 4 is also formed on the radiating surface 33. Multiple first waveguide ports 31 are arranged at intervals along a straight line and communicate with the waveguide cavity 2. The isolation groove 4 has a first side surface 41, a second side surface 42, and a bottom surface 43 located between the first side surface 41 and the second side surface 42. The bottom surface 43 and the first waveguide ports 31 face the same direction as the radio frequency unit. The first side surface 41 and the second side surface 42 are spaced apart and opposite to each other, with the first side surface 41 surrounding the multiple first waveguide ports 31 and facing away from them. Simultaneously, the isolation groove 4 includes two first intervals 51 in its extending direction. The two first intervals 51 are located on both sides of the multiple first waveguide ports 31, and the extending direction of the two first intervals 51 is parallel to the arrangement direction of the multiple first waveguide ports 31.

[0067] Specifically, in this embodiment, the number of first waveguide ports 31 can be 5, 6, or more, and the spacing between the multiple first waveguide ports 31 in the same radio frequency unit is the same. Two first intervals 51 are spaced apart on both sides of the multiple first waveguide ports 31, and the length of the first interval 51 is greater than the total arrangement length of the multiple first waveguide ports 31. The two first intervals 51 are symmetrically arranged with respect to the multiple first waveguide ports 31, that is, the distance from the two first intervals 51 to the first waveguide ports 31 is the same. The first side surface 41 and the second side surface 42 extend parallel to each other, and the bottom surface 43 is perpendicular to the first side surface 41 and the second side surface 42.

[0068] Optionally, the bottom surface 43 can be configured as a plane parallel to the radiating surface 33, or as a slope. That is, the distance from the slope to the radiating surface 33 gradually increases or decreases in the extending direction of the isolation groove 4. The depth of the isolation groove 4 can be configured from 0.2 mm to 1.4 mm, and the width of the isolation groove 4 can be configured from 0.2 mm to 1.4 mm.

[0069] Figure 11 This is a schematic diagram of the radar component in this embodiment.

[0070] In one alternative implementation, such as Figure 11 As shown, the multiple radio frequency units in the above embodiment can form a transmitting unit 71 and / or a receiving unit 72, and the first waveguide ports 31 of the multiple radio frequency units face the same side. The arrangement direction of the multiple radio frequency units in the transmitting unit 71 is perpendicular to the length direction of the first interval 51.

[0071] Specifically, the radar assembly in this embodiment includes a main body 1, which has a radiating surface 33. Multiple sets of first waveguide ports 31 are formed on the radiating surface 33. The multiple sets of first waveguide ports 31 of the transmitting unit 71 can form a signal transmission area. Electromagnetic waves from the signal transmission area are superimposed and radiated. Each set of first waveguide ports 31 is surrounded by a corresponding isolation groove 4. The multiple isolation grooves 4 divide the radiating surface 33 into multiple radiating areas 331 and isolation areas 332 located between the isolation grooves 4, thus disconnecting the radiating surface 33 by the multiple isolation grooves 4. This avoids mutual interference of electromagnetic signals between the sets of first waveguide ports 31 on the radiating surface 33 and increases the isolation between radio frequency units. Furthermore, the multiple sets of first waveguide ports 31 can also form multiple receiving units 72 to receive electromagnetic waves radiated through the signal transmission area and reflected from the target. Therefore, the radar assembly can determine the size and distance of the target.

[0072] Figure 12 This is a structural schematic diagram of the vehicle in this embodiment. Figure 11 The radar components in the system can be installed on the vehicle (e.g., Figure 12 (As shown in the dashed box). When the radar assembly is positioned at the front of the vehicle, the view from the front of the vehicle is as follows: Figure 11 As shown, multiple sets of first waveguide ports 31 are arranged sequentially along the horizontal direction. In this configuration, the first interval 51 is in a vertical position, and there are two first intervals 51 between two adjacent sets of first waveguide ports 31 to isolate electromagnetic signals. This avoids mutual interference in the near field and improves signal sensitivity in the far field. Especially in the horizontal direction (Φ direction), it reduces phase fluctuations and improves the directivity of the radar component beam.

[0073] In summary, the radio frequency unit and radar assembly in this embodiment have multiple first waveguide ports 31 and isolation slots 4 formed on the radiating surface 33, with the isolation slots 4 surrounding the multiple first waveguide ports 31. Thus, the bottom surface 43 of the isolation slot 4 separates the first side surface 41 and the second side surface 42, dividing the radiating surface 33 into an isolation region 332 and a radiating region 331, with the first waveguide ports 31 located in the radiating region 331. This improves the electric field and current distribution among the multiple first waveguide ports 31 within the isolation slot 4, avoiding electromagnetic signal interference between multiple radio frequency units in the near field, and helping to improve the directivity of the radar assembly's main lobe beam. Simultaneously, extending the first interval 51 along the arrangement direction of the multiple first waveguide ports 31 effectively reduces phase fluctuations in the horizontal direction when multiple radio frequency units form a transmitting unit 71, further improving the detection accuracy and resolution of the target.

[0074] In some implementations, such as Figure 3 , Figure 5 and Figure 8As shown, the isolation groove 4 is connected end to end in the extension direction and includes two second sections 52 spaced apart. The ends of the two first sections 51 are connected through the two second sections 52, and the first sections 51 are located on opposite sides of the two second sections 52.

[0075] Specifically, in this embodiment, the first interval 51 and the second interval 52 are alternately arranged in the extending direction of the isolation groove 4. The second interval 52 can be configured to extend in a straight line, and the two second intervals 52 are located on both sides of the first interval 51. The isolation groove 4 in this embodiment can suppress electromagnetic signals on the radiation region 331, improving the isolation between radio frequency units. Figure 11 As shown, when the arrangement direction of the multiple radio frequency units in the receiving unit 72 is perpendicular to the extension direction of the second interval 52, the isolation of the multiple radio frequency units in the receiving unit 72 can be improved.

[0076] In some implementations, such as Figures 3-4 As shown, the depth of the isolation groove 4 remains consistent along the extension direction of the isolation groove 4.

[0077] Specifically, in this embodiment, the isolation groove 4 includes two second sections 52 in its extending direction. In the cross-sectional direction of the depth of the isolation groove 4, the bottom surface 43 forms a U-shaped structure. That is, the first section 51 and the second section 52 are perpendicular to each other. Therefore, the isolation groove 4 can be machined by moving a milling cutter circumferentially along the plurality of first waveguide openings 31, thereby simplifying the machining difficulty of the isolation groove 4.

[0078] In some implementations, such as Figures 5-6 and Figures 8-9 As shown, the isolation groove 4 includes two first protrusions 61 corresponding to the two second intervals 52 respectively. The first protrusions 61 protrude from the bottom surface 43 of the corresponding second interval 52, and the top surface of the first protrusions 61 is lower than the radiation surface 33. The first protrusions 61 extend along the length direction of the corresponding first interval 51, that is, the first protrusions 61 extend parallel to the first interval 51. In this embodiment, the first protrusions 61 can increase the depth variation trend of the isolation groove 4 in the vertical direction, effectively suppressing electromagnetic signal leakage to the top or bottom of the radio frequency unit.

[0079] Furthermore, the two first intervals 51 have the same length, and the two second intervals 52 have the same length, with the length of the first interval 51 being greater than that of the second interval 52. The two ends of the first protrusion 61 extend to the two ends of the second interval 52. In the width direction of the first protrusion 61, one side of the first protrusion 61 connects to the second side surface 42 of the corresponding second interval 52, and the other side forms a third side surface 44. The third side surface 44 is parallel to the second side surface 42 of the corresponding second interval 52. In this embodiment, the length of the first protrusion 61 is configured to extend to both sides of the plurality of first waveguide ports 31, and the third side surface 44 extends along the corresponding second interval 52. Thus, the first protrusion 61 further suppresses electromagnetic signal leakage along the arrangement direction of the plurality of first waveguide ports 31, while simultaneously improving the gain of the electromagnetic signal in the pitch direction (θ direction) of the RF unit.

[0080] In some implementations, such as Figures 5-7 As shown, the third side 44 and the corresponding first side 41 of the second interval 52 are on the same plane. In this embodiment, the first protrusion 61 fills the bottom of the second interval 52. Specifically, the outline of the first waveguide port 31 is configured as a rounded rectangle, and the second interval 52 corresponds to the long side of the rounded rectangle. As a result, the depth of the first interval 51 and the depth of the second interval 52 are different, which allows the radio frequency unit to improve the phase fluctuation of the antenna without affecting the directivity of the radar component.

[0081] In some implementations, such as Figures 8-10 As shown, the third side 44 is spaced apart from the first side 41 of the corresponding second interval 52. The isolation groove 4 also includes two second protrusions 62 corresponding to the two first intervals 51 respectively. The second protrusions 62 protrude from the bottom surface 43 of the corresponding first interval 51, and the top surface of the second protrusions 62 is lower than the radiation surface 33. In the length direction, the two ends of the second protrusions 62 extend towards the two third sides 44, and the two end faces of the second protrusions 62 are respectively aligned with the first side 41 of the two second intervals 52. In this embodiment, the second protrusions 62 can further adjust the depth of the first interval 51 and suppress near-field coupling between two adjacent sets of first waveguide ports 31.

[0082] In some implementations, such as Figures 8-10As shown, the isolation groove 4 also includes two third protrusions 63 corresponding to the two second intervals 52 respectively. The third protrusions 63 protrude from the bottom surface 43 of the corresponding first interval 51, and the top surface of the second protrusions 62 is lower than the radiating surface 33. In the length direction of the third protrusions 63, the two end faces of the third protrusions 63 are aligned with the two end faces of the corresponding second protrusions 62 respectively. In the width direction of the third protrusions 63, one side of the third protrusions 63 is connected to the first side surface 41, and the other side is connected to one side of the corresponding second protrusion 62. The side of the second protrusion 62 away from the third protrusions 63 is connected to the second side surface 42. In this embodiment, in the horizontal and vertical directions of the radar assembly (e.g. Figure 9 and Figure 11 As shown, the depth of the isolation groove 4 gradually increases from the inside to the outside, so that when the electromagnetic signals emitted by multiple radio frequency units are coupled to each other, mutual interference between the near-field positions in the above two directions can be effectively avoided.

[0083] Furthermore, such as Figures 8-10 As shown, the height of the second protrusion 62 is the same as the height of the first protrusion 61, and the second protrusion 62 is higher than the third protrusion 63. Specifically, the width of the second protrusion 62 is the same as the width of the third protrusion 63. The width of the first protrusion 61 is the same as the distance between the oppositely arranged third side surface 44 and the first side surface 41. Thus, the isolation groove 4 can produce a multi-level suppression effect on electromagnetic signals.

[0084] In some implementations, such as Figure 7 and Figure 10 As shown, the first interval 51 and the second interval 52 are vertically connected. The depth of the isolation groove 4 is configured as H and the width is configured as W, where H ≤ (λ / 4), W ranges from (λ / 4) ± 0.2 mm, and λ is the operating wavelength.

[0085] Specifically, the operating frequency of the radar components is configured to be 75GHz-78GHz. The horizontal spacing between two adjacent sets of first waveguide ports 31 of the transmitting unit 71 is 3.07mm (e.g., Figure 11 (As shown in L1 at medium range). The dimensions of the first waveguide port 31 are 2.55mm × 1.25mm. In this configuration, the depth of the isolation groove 4 is less than 1mm, and the width is 0.8mm-1.2mm. Thus, the dimensions of the isolation groove 4 are configured for millimeter-wave radar, improving the detection accuracy of the radar components.

[0086] Figure 13 This is a schematic diagram of the phase angle changes in the first, second, and third embodiments. Figure 14 These are directional schematic diagrams of the first, second, and third embodiments.

[0087] like Figure 13As shown, after adding the isolation groove 4 of equal depth (second embodiment), the phase angle is improved beyond ±60°, while after adding the isolation groove 4 of unequal depth (third embodiment), the phase is significantly improved across the entire horizontal angle, especially the phase angle fluctuation within ±40° is very smooth and close to 0°.

[0088] Further reference Figure 14 As shown, the effects of not adding isolation slot 4 (first embodiment), adding isolation slot 4 of equal depth (second embodiment), and adding isolation slot 4 of unequal depth (third embodiment) on the direction are not significant. Only adding isolation slot 4 of equal depth will result in a small increase in the antenna gain at small angles.

[0089] comprehensive Figure 13 and Figure 14 As can be seen, in the third embodiment, the addition of the unequal-depth isolation slot 4 significantly improves the phase while having little impact on the radiation pattern. However, the 0° gain is slightly weakened compared to the antenna with the equal-depth isolation slot 4 in the second embodiment.

[0090] Figure 15 This is a schematic diagram of the phase angle changes in the first, third, and fourth embodiments. Figure 16 These are directional schematic diagrams of the first, third, and fourth embodiments.

[0091] like Figure 15 As shown, after adding isolation trenches 4 of varying depths (in the third and fourth embodiments), whether it is a single-layer isolation trench 4 or a stepped multi-layer isolation trench 4, the phase is significantly improved across the entire horizontal angle, that is, the phase angle fluctuation within ±40° is very smooth and close to 0°. After adding the stepped isolation trench 4 (in the fourth embodiment), the phase fluctuation is relatively smoother. It can be seen that the stepped isolation trench 4 in the fourth embodiment can further improve the phase compared to the unequal-depth isolation trench 4 in the third embodiment, but the difference is not significant.

[0092] Further reference Figure 16 As shown, after adding the stepped isolation slot 4 (fourth embodiment), the 0° gain is greater than that of the antenna with the unequal depth isolation slot 4 (third embodiment). It can be seen that after adding the stepped isolation slot 4, not only does the overall radiation pattern not change much, but it can also improve the small-angle gain.

[0093] comprehensive Figure 15 and Figure 16 As can be seen, the antenna with the addition of the stepped isolation groove 4 in the fourth embodiment can further improve the phase and increase the antenna gain compared with the antenna with the addition of the isolation groove 4 of unequal depth in the third embodiment, but the overall difference between the two is not significant.

[0094] Figure 17This is a schematic diagram showing the phase angle change of the radio frequency unit in this embodiment at different depths of the isolation slot 4 in the pitch direction. Figure 18 This is a schematic diagram showing the different depths of the isolation slot 4 in the pitch direction for the radio frequency unit in this embodiment. Figure 19 This is a schematic diagram showing the phase angle changes of the radio frequency unit in this embodiment at different depths of the isolation groove 4 in the horizontal direction. Figure 20 This is a schematic diagram showing the different depths of the isolation groove 4 in the horizontal direction for the radio frequency unit in this embodiment. Figure 21 This is a schematic diagram showing the phase angle changes of the radio frequency unit in this embodiment with different widths of the isolation slot 4 in the pitch direction. Figure 22 This is a schematic diagram showing the phase angle changes of the radio frequency unit in this embodiment corresponding to different widths of the isolation slot 4 in the horizontal direction. Figures 17-22 The results were obtained from simulations conducted at a working frequency of 75 GHz (wavelength of 4 mm).

[0095] like Figures 17-20 As shown, the depth of the isolation groove 4 is configured in the range of 0.2 mm to 1.4 mm, and the phase angle changes in the pitch and horizontal directions are smaller compared to the first embodiment. Preferably, the depth of the isolation groove 4 is configured to be less than 1 mm.

[0096] like Figures 21-22 As shown, the phase angle changes in the pitch and horizontal directions are smaller compared to the first embodiment. Preferably, the width of the isolation slot 4 is configured to be between 0.8 mm and 1.2 mm (e.g., 1 mm).

[0097] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principle of this utility model should be included within the protection scope of this utility model.

Claims

1. A radio frequency unit, characterized in that, The radio frequency unit includes: The main body has a waveguide cavity and a radiating surface, and the radiating surface has an isolation groove. The isolation groove separates the radiating surface to form an isolation area and a radiating area. The radiating area has a first waveguide port, which is connected to the waveguide cavity. The isolation groove is arranged around the first waveguide port.

2. The radio frequency unit according to claim 1, characterized in that, The number of the first waveguide ports is multiple; The isolation groove has a first side, a second side, and a bottom surface located between the first side and the second side. The first side is disposed opposite to the second side, and the first side surrounds a plurality of first waveguide ports and is opposite to the plurality of first waveguide ports.

3. The radio frequency unit according to claim 2, characterized in that, The depth of the isolation groove remains constant along its extension direction.

4. The radio frequency unit according to claim 2, characterized in that, The isolation groove includes two first sections and two second sections in its extension direction. The ends of the two first sections are connected by the two second sections, and the first sections are located on opposite sides of the two second sections. The isolation groove includes two first protrusions corresponding to the two second intervals respectively. The first protrusions protrude from the bottom surface of the corresponding second interval, and the top surface of the first protrusion is lower than the radiation surface. The first protrusions extend parallel to the first interval.

5. The radio frequency unit according to claim 4, characterized in that, Multiple first waveguide ports are arranged at linear intervals; The first interval extends along the arrangement direction of the plurality of first waveguide ports, the lengths of the two first intervals are the same, the lengths of the two second intervals are the same, and the length of the first interval is greater than that of the second interval.

6. The radio frequency unit according to claim 4, characterized in that, The isolation groove also includes two second protrusions corresponding to the two first intervals respectively. The second protrusions protrude from the bottom surface of the corresponding first interval, and the top surface of the second protrusion is lower than the radiation surface. Along the length of the second protrusion, the two end faces of the second protrusion are respectively aligned with the first side faces of the two second intervals.

7. The radio frequency unit according to claim 6, characterized in that, The isolation groove also includes two third protrusions corresponding to the two second intervals respectively. The third protrusions protrude from the bottom surface of the corresponding first interval, and the top surface of the second protrusion is lower than the radiation surface. Along the length of the third protrusion, the two end faces of the third protrusion are aligned with the two end faces of the corresponding two second protrusions. Along the width of the third protrusion, one side of the third protrusion is connected to the first side, and the other side is connected to one side of the corresponding second protrusion. The side of the second protrusion away from the third protrusion is connected to the second side.

8. The radio frequency unit according to claim 7, characterized in that, The height of the second protrusion is the same as the height of the first protrusion, and the second protrusion is higher than the third protrusion.

9. The radio frequency unit according to any one of claims 4-8, characterized in that, Both the first interval and the second interval extend in a straight line and are perpendicularly connected. The depth of the isolation groove is configured as H and the width is configured as W, where H ≤ (λ / 4), W ranges from (λ / 4) ± 0.2 mm, and λ is the operating wavelength.

10. A radar assembly, characterized in that, The radar component includes: The radio frequency unit according to any one of claims 1-9 is a plurality of radio frequency units, the first waveguide ports of the plurality of radio frequency units face the same side, and the plurality of radio frequency units constitute a transmitting unit and / or a receiving unit, and the plurality of isolation slots are spaced apart.

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