Radio frequency unit and radar assembly

Abstract

The invention discloses a radio frequency unit and a radar assembly, a plurality of first waveguide ports and an isolation groove are arranged on a radiation surface, and the isolation groove is arranged around the plurality of first waveguide ports. Therefore, the radiating surface is divided into different areas by the isolation groove, electric field and current distribution among the plurality of first waveguide ports in the isolation groove is improved, mutual interference of electromagnetic signals among the plurality of radio frequency units at a near-field position is avoided, and improvement of directivity of a main lobe beam of the radar assembly is facilitated. Meanwhile, the depths of the first interval and the second interval are configured to be different, so that the current distribution of the radiating surface in different directions is different, and after a plurality of radio frequency units form a transmitting unit or a receiving unit, the phase fluctuation in a specific direction is effectively reduced. And the detection precision and the resolution of the target object are further 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. Summary of the Invention

[0003] In view of this, this application provides a radio frequency unit and a radar assembly, which uses an isolation slot to separate each group of first waveguide ports and configures the depths of the first and second intervals to be different, so as to improve the mutual interference between two adjacent radio frequency units and the phase fluctuation 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. The radiating surface has multiple first waveguide ports and isolation grooves. The multiple first waveguide ports are arranged at intervals along a straight line and are connected to the waveguide cavity.

[0006] The isolation groove includes two first sections and two second sections in the extension direction. The two first sections and the two second sections are located on both sides of the plurality of first waveguide ports. The ends of the two first sections on the same side are connected through the second sections, and the depths of the first sections and the second sections are different.

[0007] Furthermore, the extension directions of the two first intervals are parallel to the arrangement directions of the plurality of first waveguide ports, and the second interval is perpendicularly connected to the first interval.

[0008] Furthermore, the two first intervals have the same length, the two second intervals have the same length, and the length of the first interval is greater than that of the second interval.

[0009] Furthermore, the first interval includes a first groove extending along the length direction of the first interval, and the second interval includes a second groove extending along the length direction of the second interval.

[0010] Furthermore, the depth of the second groove is less than that of the first groove.

[0011] Furthermore, the second interval has two notches at both ends, the notches being located on opposite sides of the two second intervals, and the two ends of the first interval are connected to the second groove through the two notches.

[0012] Furthermore, each of the second grooves has two notches at both ends;

[0013] The width of the first groove is the same as the width of the first interval, the width of the second groove is the same as the width of the second interval, and the two ends of the first groove are connected to the second groove through the two notches.

[0014] Furthermore, the first interval also includes a third groove, which extends parallel to the first groove and has the same length, and the depth of the third groove is different from that of the first groove;

[0015] The second interval also includes a fourth groove, which extends parallel to the second groove and has the same length, and the depth of the fourth groove is different from that of the second groove.

[0016] Furthermore, the depth of the third groove is less than that of the first groove, and the third groove is farther away from the plurality of first waveguide ports relative to the first groove;

[0017] The depth of the fourth groove is greater than that of the second groove and the third groove, the depth of the second groove is less than that of the first groove, and the fourth groove is closer to the plurality of first waveguide ports relative to the second groove.

[0018] Furthermore, each of the fourth grooves has two notches at both ends;

[0019] Both ends of the first groove and the third groove are connected to the fourth groove through the two notches.

[0020] Furthermore, the first groove has a first connecting surface, which extends along the length of the first interval and is located on the side of the first groove near the third groove, and the side of the first connecting surface away from the bottom of the first groove extends to the bottom of the third groove; the sidewall of the fourth groove has a second connecting surface, which extends along the length of the second interval and is located on the side of the fourth groove near the second groove, and the side of the second connecting surface away from the bottom of the fourth groove extends to the bottom of the second groove.

[0021] Furthermore, 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.

[0022] Furthermore, the bottom surface of the isolation groove includes an inclined surface that extends along the extension direction of the isolation groove, and the distances from the two sides of the inclined surface to the radiating surface are different in the width direction of the isolation groove.

[0023] Furthermore, the bottom surface of the isolation groove includes an arc surface that extends along the extension direction of the isolation groove and curves away from the radiating surface.

[0024] Secondly, this application also provides a radar assembly, the radar assembly comprising:

[0025] 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.

[0026] The arrangement direction of the plurality of radio frequency units of the transmitting unit is perpendicular to the length direction of the first interval.

[0027] The radio frequency (RF) unit and radar assembly of this application have multiple first waveguide ports and isolation slots formed on the radiating surface, with the isolation slots surrounding the multiple first waveguide ports. This isolation slots divide the radiating surface into different regions, improving the electric field and current distribution among the multiple first waveguide ports within the isolation slots. This avoids electromagnetic signal interference between multiple RF units in the near field, contributing to improved directivity of the radar assembly's main lobe beam. Simultaneously, by configuring different depths for the first and second intervals, the current distribution on the radiating surface varies in different directions. When multiple RF units form a transmitting or receiving unit, phase fluctuations in specific directions are effectively reduced. This further improves the detection accuracy and resolution of targets. Ultimately, the RF unit improves antenna phase fluctuations without affecting the directivity of the radar assembly. Attached Figure Description

[0028] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0029] Figure 1 This is a schematic diagram of the structure of the radio frequency unit provided in the first embodiment of the present invention;

[0030] Figure 2 This is an exploded view of the radio frequency unit provided in the first embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of one side of the radio frequency unit provided in the second embodiment of the present invention;

[0032] Figure 4This is a schematic diagram of the structure of the other side of the radio frequency unit provided in the second embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of one side of the radio frequency unit provided in the third embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the structure of the other side of the radio frequency unit provided in the third embodiment of the present invention;

[0035] Figure 7 yes Figure 6 Schematic diagram of the cross section at point AA;

[0036] Figure 8 This is a schematic diagram of one side of the radio frequency unit provided in the fourth embodiment of the present invention;

[0037] Figure 9 This is a schematic diagram of the structure of the other side of the radio frequency unit provided in the fourth embodiment of the present invention;

[0038] Figure 10 yes Figure 9 Schematic diagram of the cross section at point BB;

[0039] Figure 11 This is a schematic diagram of the radar component according to an embodiment of the present invention;

[0040] Figure 12 This is a schematic diagram of the vehicle structure according to an embodiment of the present invention;

[0041] Figure 13 This is a schematic diagram of the phase angle changes in the first, second, and third embodiments of the present invention;

[0042] Figure 14 These are schematic diagrams showing the orientation of the first, second, and third embodiments of the present invention;

[0043] Figure 15 These are schematic diagrams illustrating the phase angle changes in the first, third, and fourth embodiments of the present invention;

[0044] Figure 16 These are schematic diagrams showing the orientation of the first, third, and fourth embodiments of the present invention;

[0045] Figure 17 This is a schematic diagram of the phase angle change of the radio frequency unit in the pitch direction corresponding to different depths of the isolation slot in the pitch direction.

[0046] Figure 18 This is a schematic diagram showing the different depths of the isolation groove in the pitch direction for the radio frequency unit of this invention.

[0047] Figure 19This is a schematic diagram showing the phase angle variation of the radio frequency unit in the horizontal direction at different depths of the isolation groove in an embodiment of the present invention;

[0048] 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;

[0049] Figure 21 This is a schematic diagram of the phase angle variation corresponding to different widths of the isolation slot in the pitch direction for the radio frequency unit of the present invention.

[0050] 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 embodiment of the present invention.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1-Main body;

[0053] 11-First subject; 12-Second subject;

[0054] 2-Waveguide cavity;

[0055] 31-First waveguide port; 32-Second waveguide port; 33-Radiating surface; 331-Radiating area; 332-Isolation area;

[0056] 4-Isolation groove;

[0057] 51 - First section; 511 - First groove; 512 - Third groove;

[0058] 52 - Second section; 521 - Second groove; 522 - Fourth groove;

[0059] 53- Gap;

[0060] 541 - First connecting surface; 542 - Second connecting surface;

[0061] 71-Transmitting unit; 72-Receiving unit. Detailed Implementation

[0062] The present invention is described below based on embodiments, but the invention is not limited to these embodiments. In the detailed description of the invention below, certain specific details are described in detail. Those skilled in the art will fully understand the invention even without these details. To avoid obscuring the essence of the invention, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0063] 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.

[0064] 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".

[0065] In the description of this invention, 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 invention, unless otherwise stated, "a plurality of" means two or more.

[0066] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," 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 invention according to the specific circumstances.

[0067] 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.

[0068] 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.

[0069] In some implementations, such as Figures 1-2As 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.

[0070] Figure 3 and Figure 4 This is a schematic diagram of the radio frequency unit provided in the second embodiment.

[0071] 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.

[0072] Specifically, in this embodiment, the isolation groove 4 includes two second sections 52 in its extending direction. In the cross-sectional direction along the depth of the isolation groove 4, the bottom surface of the isolation groove 4 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.

[0073] 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.

[0074] Further reference Figures 5-10 As shown, multiple first waveguide ports 31 are arranged at intervals along a straight line and communicate with the waveguide cavity 2. An isolation groove 4 is also formed on the radiating surface 33. The isolation groove 4 includes two first intervals 51 and two second intervals 52 in the extending direction. The two first intervals 51 and the two second intervals 52 are located on both sides of the multiple first waveguide ports 31. The ends of the two first intervals 51 on the same side are connected through the second intervals 52, and the depths of the first intervals 51 and the second intervals 52 are different.

[0075] Figure 11 This is a schematic diagram of the radar component in this embodiment.

[0076] Specifically, the isolation groove 4 is connected end-to-end in the extending direction, and the first interval 51 is located on opposite sides of the two second intervals 52. In the extending direction of the isolation groove 4, the first interval 51 and the second interval 52 are alternately arranged, and the second interval 52 can be configured to extend in a straight line, with the two second intervals 52 located on both sides of the first interval 51. In this embodiment, the isolation groove 4 can suppress electromagnetic signals on the radiation area 331, improving the isolation between radio frequency units. Configuring different depths for the first interval 51 and the second interval 52 can improve the isolation of electromagnetic waves emitted by multiple first waveguide ports 31 along the width direction of the first interval 51 and along the width direction of the second interval 52, which helps to assemble multiple radio frequency units into a radar assembly. 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.

[0077] Optionally, the bottom surface of the isolation groove 4 can be configured as a plane, which is parallel to the radiation surface 33, and the two sides of the isolation groove 4 are perpendicular to the bottom surface. The depth of the isolation groove 4 can be configured to be from 0.2 mm to 1.4 mm, and the width of the isolation groove 4 can be configured to be from 0.2 mm to 1.4 mm.

[0078] In summary, the radio frequency unit in this embodiment has 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 isolation slots 4 divide the radiating surface 33 into different regions, improving the electric field and current distribution among the multiple first waveguide ports 31 within the isolation slots 4. This avoids electromagnetic signal interference between multiple radio frequency units in the near field, helping to improve the directivity of the radar component's main lobe beam. Simultaneously, configuring the depths of the first interval 51 and the second interval 52 differently results in different current distributions on the radiating surface 33 in different directions. When multiple radio frequency units form a transmitting unit 71 or a receiving unit 72, phase fluctuations in specific directions are effectively reduced, further improving the detection accuracy and resolution of targets.

[0079] 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.

[0080] 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. 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 radiation 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.

[0081] 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. The extension direction of the two first intervals 51 is parallel to the arrangement direction of the multiple first waveguide ports 31, and the second interval 52 is perpendicularly connected to the first interval 51. In this configuration, the first intervals 51 are in a vertical state, and two first intervals 51 between adjacent sets of first waveguide ports 31 isolate the 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.

[0082] In summary, the radar assembly in this embodiment has 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 isolation slots 4 divide the radiating surface 33 into different regions, improving the electric field and current distribution among the multiple first waveguide ports 31 within the isolation slots 4. This avoids electromagnetic signal interference between multiple radio frequency units in the near field, helping to improve the directivity of the radar assembly's main lobe beam. Simultaneously, configuring the depths of the first interval 51 and the second interval 52 differently results in different current distributions on the radiating surface 33 in different directions. When multiple radio frequency units form a transmitting unit 71 or a receiving unit 72, phase fluctuations in specific directions are effectively reduced. This further improves the detection accuracy and resolution of targets. It allows the radio frequency units to improve the antenna's phase fluctuations without affecting the radar assembly's directivity.

[0083] In some implementations, such as Figures 5-6 and Figures 8-9 As shown, the lengths of the two first intervals 51 are the same, the lengths of the two second intervals 52 are the same, and the length of the first interval 51 is greater than that of the second interval 52.

[0084] Optionally, 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. In this embodiment, the length of the first interval 51 can be adjusted according to the number of multiple first waveguide ports 31, and the second interval 52 can be adjusted according to the length of the first waveguide ports 31, so that the isolation groove 4 can surround the circumference of the multiple first waveguide ports 31.

[0085] In some implementations, such as Figures 5-6 and Figures 8-9 As shown, the first interval 51 includes a first groove 511 extending along the length direction of the first interval 51. The second interval 52 includes a second groove 521 extending along the length direction of the second interval 52, and the depth of the second groove 521 is less than that of the first groove 511. Thus, by further increasing the depth of the first groove 511, electromagnetic signal leakage along the arrangement direction of the multiple first waveguide ports 31 is suppressed, while the gain of the electromagnetic signal in the pitch direction (θ direction) of the radio frequency unit is improved.

[0086] In some implementations, such as Figure 5 and Figure 8 As shown, the second interval 52 has two notches 53 at both ends (as indicated by the dashed boxes in the two figures). The notches 53 are located on opposite sides of the two second intervals 52. The two ends of the first interval 51 are connected to the second groove 521 through the two notches 53. In this embodiment, the notches 53 connect the first interval 51 and the second interval 52, thereby dividing the radiating surface 33 into multiple disconnected radiating regions 331, further improving the isolation between the various radio frequency units.

[0087] In some implementations, such as Figures 5-7 As shown, each of the second grooves 521 has two notches 53 at both ends. The width of the first groove 511 is the same as the width of the first interval 51, and the width of the second groove 521 is the same as the width of the second interval 52. The two ends of the first groove 511 are connected to the second groove 521 through the two notches 53. In this embodiment, the isolation groove 4 has two depth configurations, which increases the depth variation trend of the isolation groove 4 in the vertical direction and effectively suppresses electromagnetic signal leakage to the top or bottom of the radio frequency unit.

[0088] In some implementations, such as Figures 8-10 As shown, the first interval 51 also includes a third groove 512, which extends parallel to and has the same length as the first groove 511, but the depth of the third groove 512 is different from that of the first groove 511. The second interval 52 also includes a fourth groove 522, which extends parallel to and has the same length as the second groove 521, but the depth of the fourth groove 522 is different from that of the second groove 521. In this embodiment, the isolation groove 4 has more variation in depth in both the horizontal and vertical directions, which allows the isolation groove 4 to produce multi-level suppression effects on electromagnetic signals.

[0089] In some implementations, such as Figures 8-10 As shown, the depth of the third groove 512 is less than that of the first groove 511, and the third groove 512 is farther away from the multiple first waveguide ports 31 relative to the first groove 511. The depth of the fourth groove 522 is greater than that of the second groove 521 and the third groove 512, and the fourth groove 522 is closer to the multiple first waveguide ports 31 relative to the second groove 521. Thus, the depth of the isolation groove 4 is configured to gradually increase from the inside to the outside, so that when the electromagnetic signals emitted by the multiple radio frequency units are coupled to each other, mutual interference at near-field positions in the above two directions can be effectively avoided.

[0090] In some implementations, such as Figures 8-10 As shown, each of the fourth grooves 522 has two notches 53 at both ends. The first groove 511 and the third groove 512 are connected to the fourth groove 522 through the two notches 53 at both ends. This improves the isolation between the various radio frequency units and suppresses near-field coupling between two adjacent sets of first waveguide ports 31.

[0091] In some implementations, such as Figures 8-10 As shown, the first groove 511 has a first connecting surface 541, which extends along the length of the first interval 51 and is located on the side of the first groove 511 near the third groove 512. The side of the first connecting surface 541 away from the bottom of the first groove 511 extends to the bottom of the third groove 512. The sidewall of the fourth groove 522 has a second connecting surface 542, which extends along the length of the second interval 52 and is located on the side of the fourth groove 522 near the second groove 521. The side of the second connecting surface 542 away from the bottom of the fourth groove 522 extends to the bottom of the second groove 521. In this embodiment, the first connecting surface 541 and the second connecting surface 542 are arranged parallel to the depth direction of the isolation groove 4, so that the isolation groove 4 is configured in a multi-step form, reducing the current flow on the radiation surface 33 between the radiation area 331 and the isolation area 332.

[0092] In some implementations, such as Figure 7and Figure 10 As shown, 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.

[0093] 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.

[0094] Optionally, the bottom surface of the isolation groove 4 includes a slope that extends along the extension direction of the isolation groove 4, and the distances from the two sides of the slope to the radiation surface 33 are different in the width direction of the isolation groove 4. For example, the side of the slope near the first waveguide port 31 is configured to slope towards the bottom of the isolation groove 4 to reduce the flow of current on the radiation surface 33 between the radiation region 331 and the isolation region 332.

[0095] Optionally, the bottom surface of the isolation groove 4 includes an arc surface that extends along the extension direction of the isolation groove 4 and curves away from the radiation surface 33. The isolation groove 4 also includes a first side surface and a second side surface. The first side surface and the second side surface are connected to the two sides of the arc surface and are tangent to the arc surface. This makes the inner wall of the isolation groove 4 smoother.

[0096] 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.

[0097] like Figure 13 As 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°.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] Figure 17 This 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 22This 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).

[0105] 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.

[0106] 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).

[0107] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can be modified and varied in various ways. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of protection of the present invention.

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. The radiating surface has multiple first waveguide ports and isolation grooves. The multiple first waveguide ports are arranged at intervals along a straight line and are connected to the waveguide cavity. The isolation groove includes two first sections and two second sections in the extension direction. The two first sections and the two second sections are located on both sides of the plurality of first waveguide ports. The ends of the two first sections on the same side are connected through the second sections, and the depths of the first sections and the second sections are different.

2. The radio frequency unit according to claim 1, characterized in that, The extension directions of the two first intervals are parallel to the arrangement directions of the plurality of first waveguide ports, and the second interval is perpendicularly connected to the first interval.

3. The radio frequency unit according to claim 2, characterized in that, The two first intervals have the same length, the two second intervals have the same length, and the length of the first interval is greater than that of the second interval.

4. The radio frequency unit according to claim 3, characterized in that, The first interval includes a first groove that extends along the length of the first interval, and the second interval includes a second groove that extends along the length of the second interval.

5. The radio frequency unit according to claim 4, characterized in that, The depth of the second groove is less than that of the first groove.

6. The radio frequency unit according to claim 4, characterized in that, The second interval has two notches at both ends, the notches being located on opposite sides of the two second intervals, and the two ends of the first interval are connected to the second groove through the two notches.

7. The radio frequency unit according to claim 6, characterized in that, Each of the second grooves has two notches at both ends; The width of the first groove is the same as the width of the first interval, the width of the second groove is the same as the width of the second interval, and the two ends of the first groove are connected to the second groove through the two notches.

8. The radio frequency unit according to claim 4, characterized in that, The first interval also includes a third groove, which extends parallel to the first groove and has the same length, and the depth of the third groove is different from that of the first groove; The second interval also includes a fourth groove, which extends parallel to the second groove and has the same length, and the depth of the fourth groove is different from that of the second groove.

9. The radio frequency unit according to claim 8, characterized in that, The third groove is less deep than the first groove, and the third groove is farther away from the first waveguide ports relative to the first groove; The depth of the fourth groove is greater than that of the second groove and the third groove, the depth of the second groove is less than that of the first groove, and the fourth groove is closer to the plurality of first waveguide ports relative to the second groove.

10. The radio frequency unit according to claim 9, characterized in that, Each of the fourth grooves has two notches at both ends; Both ends of the first groove and the third groove are connected to the fourth groove through the two notches.

11. The radio frequency unit according to claim 9, characterized in that, The first groove has a first connecting surface, which extends along the length of the first interval and is located on the side of the first groove near the third groove. The side of the first connecting surface away from the bottom of the first groove extends to the bottom of the third groove. The sidewall of the fourth groove has a second connecting surface, which extends along the length of the second interval and is located on the side of the fourth groove near the second groove. The side of the second connecting surface away from the bottom of the fourth groove extends to the bottom of the second groove.

12. The radio frequency unit according to any one of claims 1-11, characterized in that, 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.

13. The radio frequency unit according to any one of claims 1-11, characterized in that, The bottom surface of the isolation groove includes an inclined surface that extends along the extension direction of the isolation groove, and the distances from the two sides of the inclined surface to the radiating surface are different in the width direction of the isolation groove.

14. The radio frequency unit according to any one of claims 1-11, characterized in that, The bottom surface of the isolation groove includes an arc surface that extends along the extension direction of the isolation groove and curves away from the radiating surface.

15. A radar assembly, characterized in that, The radar component includes: The radio frequency unit according to any one of claims 1-14 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; The arrangement direction of the plurality of radio frequency units of the transmitting unit is perpendicular to the length direction of the first interval.

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