Radio frequency unit and radar assembly

Abstract

The embodiment of the invention discloses a radio frequency unit and a radar assembly, a first body and a second body are oppositely combined together, and a waveguide cavity comprises a first waveguide port, a second waveguide port and an extension section connected between the first waveguide port and the second waveguide port. Therefore, the extension interval is configured to be the multi-stage power divider group, the insertion loss of the radio frequency unit in a relatively high frequency band is improved, and the signal receiving and transmitting precision of the radio frequency unit is improved.

Description

Technical Field

[0001] The present invention relates to the field of radar technology, and in particular to a radio frequency unit and a radar component. Background Art

[0002] Millimeter-wave radar can use electromagnetic waves for detection. With its high resolution, small size and anti-interference ability, millimeter-wave radar can be applied to many fields. However, the antenna formed by microstrip antenna or substrate integrated waveguide (SIW) has large transmission loss and complex manufacturing process. How to reduce transmission loss and manufacturing difficulty has become a problem that needs to be solved. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a radio frequency unit and a radar component, which utilize a waveguide cavity to conduct electromagnetic waves, thereby reducing transmission loss and processing difficulty.

[0004] According to a first aspect of an embodiment of the present invention, a radio frequency unit is provided, the radio frequency unit comprising:

[0005] A first entity; and

[0006] A second body, combined with the first body to form a waveguide cavity, the waveguide cavity comprising an extension section, a first waveguide port and a plurality of second waveguide ports, the extension section extending from the first waveguide port to the plurality of second waveguide ports;

[0007] The extension section includes a plurality of power dividers in the extension direction, and the power dividers have a first connection end and two second connection ends. The plurality of power dividers are connected to form a multi-stage power divider group, and the second connection end of the power divider of the previous stage is connected to the first connection end of the power divider of the next stage.

[0008] Furthermore, the multiple power dividers include a first power divider and a second power divider, and the first power divider and the second power divider are at the same level, and the second connecting ends of the first power divider and the second power divider are connected to form a confluence area, and the confluence area is connected to part of the multiple second waveguide openings.

[0009] Further, the plurality of second waveguide openings are arranged at intervals;

[0010] The second connecting ends on the side where the first power divider and the second power divider are close to each other are connected to form the confluence area, and the confluence area is connected to the second waveguide opening in the middle area, and the two second connecting ends on the side where the first power divider and the second power divider are far away from each other are respectively connected to the second waveguide openings in the two side areas.

[0011] Furthermore, the plurality of power dividers include a plurality of third power dividers arranged at intervals, the third power dividers are located at a subsequent stage of the first power divider, and the plurality of second connection ends of the plurality of third power dividers are respectively connected to the plurality of second waveguide ports correspondingly.

[0012] Furthermore, the first connection end of the third power divider located in the middle area is connected to the confluence area, and the first connection end of the third power divider located in the two side areas is respectively connected to two second connection ends on the side away from each other of the first power divider and the second power divider.

[0013] Further, the first body has a first groove and the plurality of second waveguide openings, and the second waveguide openings penetrate the first body and are connected to the first groove;

[0014] The second body has a second groove, and the first waveguide port passes through the second body and is connected to the second groove;

[0015] The first groove and the second groove are combined to form the waveguide cavity.

[0016] Furthermore, the second body includes a plurality of first bosses, which are protruding from the bottom of the second groove and respectively arranged corresponding to the plurality of second waveguide openings. The height of the first boss is less than the depth of the second groove, and in the extension direction of the extension interval, the first boss is away from the first waveguide opening.

[0017] Furthermore, the second body includes a second boss, which is protruding from the bottom of the first groove and corresponding to the first waveguide opening. The height of the second boss is smaller than the depth of the first groove, and in the extension direction of the extension interval, the second boss is arranged away from the second waveguide opening.

[0018] Further, the multi-stage power divider group is a three-stage power divider group, and the three-stage power divider group includes a first-stage fourth power divider, a second-stage first power divider, a second-stage second power divider, and three third-stage third power dividers;

[0019] The transmission power of each of the second waveguide ports corresponding to the merging area is 54% of the transmission power of the first waveguide port.

[0020] Further, the first groove includes a middle groove and a plurality of branch grooves, the plurality of branch grooves extend from the middle groove to the second waveguide port, a stopper is protruding from the middle of the middle groove, a side surface of the stopper is spaced apart from a side surface of the middle groove, and the side surface of the stopper forms part of the confluence area.

[0021] Further, the power divider includes a first extension section, a second extension section and a third extension section, one end of the second extension section and the third extension section respectively form the two second connection ends, and the other end is simultaneously connected to one end of the first extension section, and the other end of the first extension section forms the first connection end;

[0022] The two second extension sections of the first power divider and the second power divider are connected to form the merging area, and the cross-sectional area of ​​the second extension section at one end away from the second waveguide opening is larger than the cross-sectional area of ​​the third extension section at one end away from the second waveguide opening.

[0023] Furthermore, the second extension section and the third extension section of the third power divider located in the middle are mirror-symmetrical with respect to the first extension section;

[0024] The third power divider is located on both sides, the two second extension sections are located between the two third extension sections, and the cross-sectional area of ​​the second extension section away from the second waveguide port is larger than the cross-sectional area of ​​the third extension section away from the second waveguide port.

[0025] Furthermore, the operating frequency band of the radio frequency unit is between 74 GHz and 79 GHz.

[0026] In a second aspect, an embodiment of the present invention further provides a radar component, the radar component comprising:

[0027] A plurality of radio frequency units, wherein the radio frequency units include a first body and a second body, wherein the second body and the first body are combined to form a waveguide cavity, wherein the waveguide cavity includes an extension section, a first waveguide port, and a plurality of second waveguide ports, wherein the extension section extends from the first waveguide port to the plurality of second waveguide ports;

[0028] The extension section includes a plurality of power dividers in the extension direction, and the power dividers have a first connection end and two second connection ends, the plurality of power dividers are connected to form a multi-stage power divider group, and the second connection end of the power divider of the previous stage is connected to the first connection end of the power divider of the next stage;

[0029] The multiple power dividers include a first power divider and a second power divider, and the first power divider and the second power divider are at the same level. The second connecting ends of the first power divider and the second power divider are connected to form a confluence area, and the confluence area is connected to at least part of the multiple second waveguide openings.

[0030] Further, the radar assembly includes a first connecting plate and a second connecting plate, the first connecting plate includes a plurality of the first bodies, and the second connecting plate includes a plurality of second bodies respectively corresponding to the plurality of the first bodies;

[0031] The first connecting plate and the second connecting plate are spliced ​​together, the first body and the corresponding second body are matched to form the waveguide cavity, the multiple RF units include multiple transmitting units and multiple receiving units, the first waveguide ports and the second waveguide ports of the multiple transmitting units are respectively the waveguide input port and the waveguide output port, and the first waveguide ports and the second waveguide ports of the multiple receiving units are respectively the waveguide output port and the waveguide input port.

[0032] Furthermore, the number of the multiple transmitting units is six and they are arranged horizontally at intervals, the multiple waveguide outlets of each transmitting unit are arranged vertically, and the spacing between two adjacent transmitting units is 0.5λ×N, wherein λ is the operating wavelength of the transmitting unit and N is a positive integer.

[0033] Furthermore, the detection range of the radar assembly is configured to be 250m.

[0034] Furthermore, the radar assembly also includes:

[0035] A radio frequency circuit, including a signal transmitting end and a signal receiving end;

[0036] A waveguide conversion portion, disposed between the second connecting plate and the radio frequency circuit;

[0037] The waveguide outlets of the plurality of transmitting units and the waveguide inlet of the receiving unit are formed on a plate surface of the first connecting plate facing away from the second connecting plate;

[0038] The input waveguide ports of the plurality of transmitting units and the output waveguide ports of the receiving unit are formed on the board surface of the second connecting board facing away from the first connecting board, and the input waveguide ports and the output waveguide ports are respectively communicatively connected with the signal transmitting end and the signal receiving end through the waveguide conversion part.

[0039] The RF unit and radar assembly in this embodiment combine the first body and the second body to form a waveguide cavity. Thus, the processing technology of the waveguide cavity is simplified. The waveguide cavity includes a first waveguide port, a second waveguide port, and an extension section connected between the first waveguide port and the second waveguide port for electromagnetic wave conduction, thereby reducing transmission loss. Thus, the extension section is configured as a multi-stage power divider group, which improves the insertion loss of the RF unit at a higher frequency band and improves the signal transmission and reception accuracy of the RF unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0041] Figure 1is a structural diagram of one side of a radio frequency unit according to an embodiment of the present invention;

[0042] Figure 2 is a schematic structural diagram of the other side of the radio frequency unit according to an embodiment of the present invention;

[0043] Figure 3 is an exploded schematic diagram of a radio frequency unit according to an embodiment of the present invention;

[0044] Figure 4 is a structural schematic diagram of one side of the second body of an embodiment of the present invention;

[0045] Figure 5 is a schematic structural diagram of the other side of the second body of an embodiment of the present invention;

[0046] Figure 6 is a schematic diagram of one side of a first body of an embodiment of the present invention;

[0047] Figure 7 is a schematic diagram of the other side of the first body of an embodiment of the present invention;

[0048] Figure 8 yes Figure 1 Schematic cross-sectional view at AA in the middle;

[0049] Fig. 9 yes Figure 2 A schematic cross-sectional view of the middle BB;

[0050] Fig.10 yes Figure 1 Schematic cross-sectional view at CC in the middle;

[0051] Fig.11 is a schematic structural diagram of a waveguide cavity according to an embodiment of the present invention;

[0052] Fig.12 is a schematic structural diagram of one side of a radar assembly according to an embodiment of the present invention;

[0053] Fig.13 is a schematic structural diagram of the other side of the radar assembly according to an embodiment of the present invention;

[0054] Fig.14 is a structural schematic diagram of another side of a radar assembly according to an embodiment of the present invention;

[0055] Fig.15 is a schematic structural diagram of a first connecting plate according to an embodiment of the present invention;

[0056] Fig.16 is a structural schematic diagram of a second connecting plate according to an embodiment of the present invention;

[0057] Fig.17 is a schematic structural diagram of a vehicle according to an embodiment of the present invention;

[0058] Fig.18 is a schematic diagram of simulation of return loss of an embodiment of the present invention;

[0059] Fig.19 is a schematic diagram of radiation gain simulation at different frequencies according to an embodiment of the present invention;

[0060] Fig. 20 It is a schematic diagram of radiation gain simulation in different directions according to an embodiment of the present invention.

[0061] Description of reference numerals:

[0062] 1- waveguide cavity;

[0063] 11-first waveguide opening; 12-second waveguide opening; 13-extension section; 131-first extension section; 132-second extension section; 133-third extension section;

[0064] 2-Power divider;

[0065] 21-first connection end; 22-second connection end; 23-merging area;

[0066] 2a-first power divider; 2b-second power divider; 2c-third power divider; 2d-fourth power divider; 2e-main branch;

[0067] 31-first body; 32-second body; 33-first groove; 331-middle groove; 332-branch groove; 333-blocking platform; 34-second groove; 35-first boss; 36-step hole; 37-third groove; 38-second boss; 39-blocking wall;

[0068] 51-first connecting plate; 52-second connecting plate;

[0069] 6-transmitting unit;

[0070] 7- receiving unit;

[0071] 8-RF circuit;

[0072] 9- Waveguide conversion section. DETAILED DESCRIPTION

[0073] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the detailed description of the present invention below, some specific details are described in detail. It is possible for a person skilled in the art to fully understand the present invention without the description of these details. In order to avoid confusing the essence of the present invention, known methods, processes, flows, components and circuits are not described in detail.

[0074] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0075] Unless the context clearly requires otherwise, the words "include", "comprising" and similar words throughout the application should be interpreted as including rather than exclusive or exhaustive; that is, the meaning is "including but not limited to".

[0076] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0077] Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] For ease of explanation, spatially relative terms such as "inside", "outside", "below", "below", "lower", "above", "upper", etc. are used herein to describe the relationship of one element or feature illustrated in the figures to another element or feature. It will be understood that spatially relative terms may be intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figure is turned over, an element described as being "below" or "below" other elements or features will then be positioned as being "above" the other elements or features. Thus, the example term "below" can include both the orientations of above and below. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0079] Figure 1 and Figure 2 is a schematic diagram of the structure of the radio frequency unit of this embodiment. Figure 3 FIG. 4 is an exploded schematic diagram of the radio frequency unit of this embodiment.

[0080] In some embodiments, Figure 1-Figure 3As shown, the radio frequency unit in this embodiment includes a first body 31 and a second body 32. The first body 31 and the second body 32 can be fixed by welding (such as reflow welding or diffusion welding) or by screws. The material of the first body 31 and the second body 32 can be configured as a conductive material, such as aluminum alloy or Permalloy, etc. Such materials can conduct electromagnetic waves and conduct heat at the same time.

[0081] Figure 4 and Figure 5 3 is a schematic structural diagram of the second body 32 of this embodiment. Figure 6 and Figure 7 is a schematic diagram of the first body 31 of this embodiment. Figure 8 and Fig. 9 is a schematic cross-sectional view of the radio frequency unit of this embodiment. Figure 7 The corresponding position of the first waveguide opening 11 is shown in a dotted frame.

[0082] In some embodiments, Figure 4-Figure 9 As shown, the first body 31 and the second body 32 in this embodiment are roughly plate-shaped structures, the first body 31 has a first plate surface, and the second body 32 has a second plate surface arranged opposite to the first plate surface. After the first body 31 and the second body 32 are connected together through the first plate surface and the second plate surface, the opposite sides of the two form a waveguide cavity 1.

[0083] Optionally, a recessed area is provided on the first plate surface, and the second plate surface is a plane. When the second plate surface is sealed on the top of the recessed area, the waveguide cavity 1 is formed. Alternatively, a recessed area is provided on the second plate surface, and the first plate surface is set to a plane, and the first plate surface is sealed on the top of the recessed area to form the waveguide cavity 1.

[0084] Fig.10 FIG. 1 is a cross-sectional diagram of one side of the radio frequency unit of this embodiment. The radio frequency unit in the figure cuts away a portion of the first body 31 . Fig.11 1 is a schematic diagram of the structure of the waveguide cavity 1 of this embodiment. In the figure, the outlines of the first power divider 2a and the second power divider 2b are shown with dotted lines, and the outlines of the third power divider 2c and the fourth power divider 2d are shown with thick solid lines. The outline of the second waveguide port 12 is shown with dotted lines.

[0085] In some embodiments, Figure 8-Figure 11 As shown, the waveguide cavity 1 includes an extension section 13, a first waveguide port 11 and a plurality of second waveguide ports 12, and the extension section 13 extends from the first waveguide port 11 to the plurality of second waveguide ports 12. Thus, the electromagnetic wave fed into the waveguide cavity 1 from the first waveguide port 11 is continuously reflected along the inner wall of the waveguide cavity 1 to form a standing wave.

[0086] Specifically, when the first waveguide port 11 is used to feed electromagnetic waves, the electromagnetic waves will radiate to the outside of the radio frequency unit from the multiple second waveguide ports 12 after passing through the waveguide cavity 1. When the multiple second waveguide ports 12 are used to receive electromagnetic waves, the electromagnetic waves will converge to the first waveguide port 11 after passing through the waveguide cavity 1. That is, the radio frequency unit can use the second waveguide ports 12 to transmit or receive electromagnetic waves.

[0087] Further reference Fig.11 As shown, the extension section 13 includes a plurality of power dividers 2 in the extension direction, and the power divider 2 has a first connection end 21 and two second connection ends 22. The power divider 2 in this embodiment can be equivalent to a T-type power divider. The two second connection ends 22 are two output ends of the T-type power divider, and the first connection end 21 is the input end of the T-type power divider. After passing through the power divider 2, the electromagnetic wave will be divided into two paths and continue to be conducted in the waveguide cavity 1.

[0088] Further reference Fig.11 As shown, a plurality of power dividers 2 are connected to form a multi-stage power divider group, and the second connection end 22 of the power divider 2 of the previous stage is connected to the first connection end 21 of the power divider 2 of the next stage. That is, in the extension direction of the extension section 13, in the adjacent two-stage power dividers 2, the two second connection ends 22 of the power dividers 2 close to the first waveguide port 11 are respectively connected to the two first connection ends 21 of the two power dividers 2 far from the first waveguide port 11.

[0089] In summary, the RF unit in this embodiment combines the first body 31 and the second body 32 together to form a waveguide cavity 1. Thus, the processing technology of the waveguide cavity 1 is simplified. The waveguide cavity 1 includes a first waveguide port 11, a second waveguide port 12, and an extension section 13 connected between the first waveguide port 11 and the second waveguide port 12 for electromagnetic wave conduction, thereby reducing transmission loss. Therefore, the extension section 13 is configured as a multi-stage power divider group, which improves the insertion loss of the RF unit in a higher frequency band and improves the signal transmission and reception accuracy of the RF unit.

[0090] Optionally, the multi-stage power divider group can be two-stage, three-stage, four-stage or more stages, and those skilled in the art can select it according to the power or beam shape of the electromagnetic waves being transmitted and received, etc. At the same time, the number of power dividers 2 can also be adjusted according to demand, for example, 6, 14 or more.

[0091] At the same time, the multiple power dividers 2 include a first power divider 2a and a second power divider 2b, and the first power divider 2a and the second power divider 2b are at the same level. The second connection ends 22 of the first power divider 2a and the second power divider 2b are connected to form a confluence area 23. The confluence area 23 is connected to at least part of the multiple second waveguide ports 12. As a result, when the electromagnetic wave passes through the confluence area 23 from the first power divider 2a and the second power divider 2b, the electromagnetic wave will be superimposed after passing through the two second connection ends 22. Thereby, the receiving and transmitting power of the second waveguide port 12 connected to the confluence area 23 for the electromagnetic wave is improved, and when the beams of the multiple second waveguide ports 12 are superimposed on each other, the radiation gain of the second waveguide port 12 connected to the confluence area 23 is also improved, so that the radiation distance of the main lobe beam is farther. In addition, the radiation gain of the second waveguide port 12 staggered from the confluence area 23 is relatively reduced, which can avoid the interference of the side lobe beam on the detection of the main lobe beam. That is, under the premise of ensuring that the amplitudes of the electromagnetic waves received and sent by each second waveguide port 12 are different to a certain extent, the phase inconsistency of the electromagnetic waves of each second waveguide port 12 is avoided, so as to avoid the situation where multiple second waveguide ports 12 cannot be further superimposed.

[0092] The second connection ends 22 of the first power divider 2a and the second power divider 2b at the same level are connected to form a confluence area 23, and the power of the electromagnetic waves after superposition in the confluence area 23 is further improved. Thus, the radiation gain of the second waveguide port 12 connected to the confluence area 23 is improved, and the radiation gain of the second waveguide port 12 staggered from the confluence area 23 is relatively reduced. The main lobe beam is radiated at a longer distance, the detection is more accurate, and the interference of the side lobe beam on the main lobe beam detection is reduced.

[0093] In some embodiments, Figure 10-11 As shown, a plurality of second waveguide ports 12 are arranged at intervals. The spacings of the plurality of second waveguide ports 12 can be configured to be the same. The second connection ends 22 of the first power divider 2a and the second power divider 2b on the side close to each other are connected to form a merging area 23, and the merging area 23 is connected to the second waveguide port 12 in the middle area, and the two second connection ends 22 of the first power divider 2a and the second power divider 2b on the side far away from each other are respectively connected to the second waveguide ports 12 in the two side areas.

[0094] Therefore, the waveguide cavity 1 of the radio frequency unit in this embodiment is in the same plane, and the confluence area 23 is set in the middle area of ​​the first power divider 2a and the second power divider 2b, which can facilitate the connection of multiple power dividers 2. At the same time, the electromagnetic waves radiated by the second waveguide port 12 in the middle area can be easily superimposed with the electromagnetic waves of the second waveguide ports 12 on both sides to ensure the stability of the shape of the main lobe beam.

[0095] In some embodiments, Fig.11As shown, the multiple power dividers 2 include multiple third power dividers 2c arranged at intervals, and the third power dividers 2c are located at the subsequent stage of the first power divider 2a and the second power divider 2b. The multiple second connection ends 22 on the multiple third power dividers 2c are respectively connected to the multiple second waveguide ports 12 in a one-to-one correspondence. That is, each second waveguide port 12 corresponds to a second connection end 22 of a third power divider 2c. Therefore, by using multiple third power dividers 2c, the multiple second waveguide ports 12 can be distributed at intervals to ensure the radiation angle of the electromagnetic wave.

[0096] In some embodiments, Fig.11 As shown, the first connection end 21 of the third power divider 2c located in the middle area is connected to the confluence area 23, and the first connection end 21 of the third power divider 2c located in the two side areas is respectively connected to the two second connection ends 22 of the first power divider 2a and the second power divider 2b on the side away from each other.

[0097] Specifically, the multiple second waveguide ports 12 in this embodiment form multiple pairs of second waveguide ports 12, and the multiple second waveguide ports 12 of the same radio frequency unit are arranged in a straight line, and the spacing between the multiple second waveguide ports 12 is the same. The power of a pair of second waveguide ports 12 corresponding to the confluence area 23 is guaranteed to be consistent. As a result, the width of the main lobe beam is increased, and the main lobe beam detection area is improved.

[0098] In some embodiments, Figure 3-Figure 7 As shown, the first body 31 has a first groove 33 and a plurality of second waveguide openings 12, and the second waveguide openings 12 penetrate the first body 31 and are connected to the first groove 33. The second body 32 has a second groove 34, and the first waveguide opening 11 penetrates the second body 32 and is connected to the second groove 34. The first groove 33 and the second groove 34 are aligned to form the waveguide cavity 1. As a result, the depths of the first groove 33 and the second groove 34 are within a certain range, ensuring the machining accuracy of the milling cutter.

[0099] Specifically, the second waveguide opening 12 is opened at the bottom of the first groove 33 and is located at an end away from the first waveguide opening 11. The first waveguide opening 11 is opened at the bottom of the second groove 34 and is located at an end away from the second waveguide opening 12. When the first groove 33 and the second groove 34 are aligned, the orientation of the first waveguide opening 11 and the second waveguide opening 12 is perpendicular to the extension direction of the extension section 13. Thus, the electromagnetic wave in the waveguide cavity 1 can change its propagation direction, so that the second waveguide opening 12 can be oriented toward the target position, so as to facilitate the radio frequency unit to send and receive electromagnetic waves.

[0100] Preferably, a conductive layer is disposed on the inner walls of the first groove 33 and the second groove 34. For example, copper is plated on the inner walls of the first groove 33 and the second groove 34, thereby further improving the conductivity of the radio frequency unit and the conduction performance of electromagnetic waves.

[0101] In some embodiments, Figure 4 , Figure 5 , Figure 8 and Fig.10 As shown, the second body 32 includes a plurality of first bosses 35. The plurality of first bosses 35 are convexly disposed at the bottom of the second groove 34 and are respectively disposed corresponding to the plurality of second waveguide ports 12. The height of the first bosses 35 is less than the depth of the second groove 34 (see Figure 8 ), and in the extension direction of the extension section 13, the first boss 35 is away from the first waveguide opening 11. Thus, the electromagnetic wave conduction direction can be changed by the first boss 35, so that the electromagnetic wave is conducted along a direction perpendicular to the extension section 13.

[0102] Preferably, a partial area of ​​the second waveguide opening 12 corresponds to an edge area of ​​the first groove 33, so that the propagation cross-sectional area of ​​the electromagnetic wave can be gradually increased, so as to facilitate the transmission or reception of the electromagnetic wave and improve the performance parameters of the radio frequency unit.

[0103] In some embodiments, Figure 6 , Figure 7 and Fig. 9 As shown, the second body 32 includes a second boss 38. The second boss 38 is convexly disposed at the bottom of the first groove 33 and is disposed corresponding to the first waveguide port 11. The height of the second boss 38 is less than the depth of the first groove 33 (see Fig. 9 ). In the extension direction of the extension section 13, the second boss 38 is arranged away from the second waveguide port 12. Thus, when the electromagnetic wave is fed into the first waveguide port 11, the propagation direction of the electromagnetic wave can be changed so that the electromagnetic wave is conducted along the plane where the extension section 13 is located. The S11 parameter is further adjusted to reduce the energy reflection at the position of the first waveguide port 11.

[0104] Specifically, the projection of a part of the second waveguide opening 12 on the second body 32 is located outside the first groove 33. Thus, the electromagnetic wave can change its conduction direction to be conducted in a direction perpendicular to the extension section 13. Its propagation cross-sectional area can be gradually increased to facilitate the transmission or reception of electromagnetic waves. At the same time, the performance parameters of the radio frequency unit are improved.

[0105] Preferably, if Figure 8 As shown, a third groove 37 is provided on one side of the first body 31 away from the second body 32, and a step hole 36 is provided at the bottom of the third groove 37, and the step hole 36 penetrates the first body 31. The small diameter section of the step hole 36 is used to form the second waveguide port 12, and the large diameter section is connected to the third groove 37. Therefore, the third groove 37 is used in conjunction with the step hole 36 to improve the transceiver gain of the radio frequency unit and improve the radiation efficiency.

[0106] In some embodiments, Fig.11 As shown, the multi-stage power divider group is a three-stage power divider group, and the three-stage power divider group includes a first-stage fourth power divider 2d, a second-stage first power divider 2a, a second-stage second power divider 2b, and three third-stage third power dividers 2c. The transmission power of each second waveguide port 12 corresponding to the converging area 23 is configured to be 54% of the transmission power of the first waveguide port 11.

[0107] Preferably, the waveguide cavity 1 further comprises a main branch 2e. The main branch 2e extends straight and is parallel to the arrangement direction of the plurality of second waveguide ports 12. One end of the main branch 2e is connected to the first connection end 21 of the fourth power divider 2d, and the other end is connected to the first waveguide port 11.

[0108] Specifically, if Fig.11 As shown, the power of the first connection end 21 of the fourth power divider 2d is consistent with the first waveguide port 11. The power of the second connection end 22 of the fourth power divider 2d is 50% of the first waveguide port 11. That is, the power of the first connection end 21 of the first power divider 2a and the second power divider 2b is also 50% of the first waveguide port 11. The power of the two second connection ends 22 of the first power divider 2a and the second power divider 2b used to form the confluence area 23 is 27% of the first waveguide port 11. The power of the two second connection ends 22 of the first power divider 2a and the second power divider 2b that are far away from each other is 23% of the first waveguide port 11.

[0109] The power of the first connection end 21 of the fourth power divider 2d located in the middle is 54% of the first waveguide port 11, and the power of the two second connection ends 22 is 27% of the first waveguide port 11. In the two fourth power dividers 2d located on both sides, the power of the first connection end 21 is 23% of the first waveguide port 11, the power of the two first connection ends 21 far away from each other is 7% of the first waveguide port 11, and the power of the two first connection ends 21 close to each other is 16% of the first waveguide port 11.

[0110] That is, the transmission powers of the six second waveguide ports 12 are 7%, 16%, 27%, 27%, 16% and 7% of the first waveguide port 11 from left to right. Therefore, in this embodiment, the superposition effect of the converging area 23 on the electromagnetic waves is utilized, so that the power allocated to the second waveguide port 12 farther from the middle third power divider 2c is lower, thereby ensuring the detection accuracy of the radio frequency unit and avoiding interference to surrounding devices.

[0111] In some embodiments, Figure 5As shown, the first groove 33 includes a middle groove 331 (the area of ​​the middle groove 331 is shown with a cross-hatching line) and a plurality of branch grooves 332. The plurality of branch grooves 332 extend from the middle groove 331 to the second waveguide port 12, and a stopper 333 is protruded from the middle of the middle groove 331, and the side of the stopper 333 is spaced apart from the side of the middle groove 331, and the side of the stopper 333 forms a part of the confluence area 23.

[0112] Alternatively, if Figure 7 As shown, the second groove 34 includes a middle groove 331 (the area of ​​the middle groove 331 is shown with a cross-section line) and a plurality of branch grooves 332, so that the second groove 34 is similar in form to the first groove 33. The configuration of the first groove 33 and the second groove 34 in this embodiment can reduce the difficulty of processing, so that the milling cutter can perform cutting motion along the circumference of the stop 333, thereby accelerating the processing speed of the first body 31 and the second body 32.

[0113] In some embodiments, Figure 10-11 As shown, the power divider 2 includes a first extension section 131, a second extension section 132 and a third extension section 133 connected to each other. The ends of the second extension section 132 and the third extension section 133 away from the first extension section 131 respectively form two second connection ends 22, and the other ends are simultaneously connected to one end of the first extension section 131. The other end of the first extension section 131 forms the first connection end 21.

[0114] The two second extension sections 132 of the first power divider 2a and the second power divider 2b are connected to form a confluence area 23, and the cross-sectional area of ​​the second extension section 132 of the first power divider 2a away from the second waveguide port 12 is larger than the cross-sectional area of ​​the third extension section 133 away from the second waveguide port 12. The cross-sectional area of ​​the second extension section 132 of the second power divider 2b away from the second waveguide port 12 is larger than the cross-sectional area of ​​the third extension section 133 away from the second waveguide port 12. Thus, the end portions of the second extension section 132 and the third extension section 133 connected to the first extension section 131 are configured to have different calibers, so that when the power divider 2 performs power distribution, the two second connection ends 22 can be allocated different powers, so that the power of the confluence area 23 is larger, and the gain amplitude of the main lobe beam is further improved.

[0115] In some embodiments, Fig.11As shown, the second extension section 132 and the third extension section 133 of the third power divider 2c located in the middle are mirror-symmetrical with respect to the confluence area 23. In the third power dividers 2c located on both sides, the two second extension sections 132 are located between the two third extension sections 133, and the cross-sectional area of ​​the second extension section 132 away from the second waveguide port 12 is larger than the cross-sectional area of ​​the third extension section 133 away from the second waveguide port 12. Therefore, in the third power dividers 2c on both sides, the end portions of the second extension section 132 and the third extension section 133 connected to the first extension section 131 are configured to have different calibers, which can further distribute the power, so that the transmission power of the second waveguide ports 12 on both sides is smaller, thereby improving the detection accuracy of the radar assembly. In contrast, the caliber change amplitudes of the second extension section 132 and the third extension section 133 corresponding to the confluence area 23 are configured to be the same, that is, the second extension section 132 and the third extension section 133 are radially symmetrical with respect to the first extension section 131. Thereby, it is ensured that the two second waveguide ports 12 in the middle position can output electromagnetic waves with the same gain, further increasing the width of the main lobe beam.

[0116] In some embodiments, Figure 10-11 As shown, a plurality of retaining walls 39 are convexly provided on the branch grooves 332 of the first groove 33 and the second groove 34. When the first groove 33 and the second groove 34 are matched together, the upper and lower retaining walls 39 are abutted together. The retaining wall 39 separates the branch grooves 332 to form the second extension section 132 and the third extension section 133. Among them, the retaining wall 39 in the middle position corresponds to the confluence area 23. The retaining walls 39 located on both sides are offset to both sides of the middle retaining wall 39 so that the connection calibers of the second extension section 132 and the third extension section 133 are different. Therefore, the use of a plurality of retaining walls 39 can simplify the cutting work of the milling cutter and improve the processing accuracy. Those skilled in the art can adjust the power distribution by changing the position of the retaining wall 39.

[0117] Furthermore, the cross-sectional areas of the second extension section 132 and the third extension section 133 of the fourth power divider 2d vary in a consistent manner, that is, the second extension section 132 and the third extension section 133 are symmetrically arranged relative to the confluence area 23. Thus, the waveform of the electromagnetic wave can be kept symmetrical in the arrangement direction of the plurality of second waveguide ports 12.

[0118] Figure 12-14 Schematic diagram of the structure of the radar assembly of this embodiment. Fig.14 Only a portion of the second waveguide opening 12 is shown. Fig.15 Schematic diagram of the structure of the first connecting plate 51 of this embodiment. Fig.16 Schematic diagram of the structure of the second connecting plate 52 of this embodiment. Fig.15 The side of the first connecting plate 51 facing away from the second connecting plate 52 is shown in FIG. Fig.16, a side of the second connecting plate 52 facing away from the first connecting plate 51 is shown.

[0119] In some embodiments, Fig.12 As shown, the radar assembly in this embodiment includes multiple radio frequency units. Figure 1-Figure 11 As shown, the radio frequency unit includes a first body 31 and a second body 32, the second body 32 and the first body 31 are matched to form a waveguide cavity 1, the waveguide cavity 1 includes an extension section 13, a first waveguide port 11 and a plurality of second waveguide ports 12, and the extension section 13 extends from the first waveguide port 11 to the plurality of second waveguide ports 12. The extension section 13 includes a plurality of power dividers 2 in the extension direction, and the power divider 2 has a first connection end 21 and two second connection ends 22, the plurality of power dividers 2 are connected to form a multi-stage power divider group, and the second connection end 22 of the power divider 2 of the previous stage is connected to the first connection end 21 of the power divider 2 of the next stage. The plurality of power dividers 2 include a first power divider 2a and a second power divider 2b, and the first power divider 2a and the second power divider 2b are at the same stage, and the second connection ends 22 of the first power divider 2a and the second power divider 2b are connected to form a confluence area 23, and the confluence area 23 is connected to at least part of the plurality of second waveguide ports 12.

[0120] Specifically, the multiple radio frequency units in this embodiment can be used to receive or send electromagnetic waves. The radar component in this embodiment can be a millimeter wave radar. The operating frequency of the millimeter wave radar can be 77 GHz, or a higher operating frequency band.

[0121] In summary, the radar assembly in this embodiment combines the first body 31 and the second body 32 of the RF unit to form a waveguide cavity 1. Thus, the processing technology of the waveguide cavity 1 is simplified. The waveguide cavity 1 includes a first waveguide port 11, a second waveguide port 12, and an extension section 13 connected between the first waveguide port 11 and the second waveguide port 12 for electromagnetic wave conduction, thereby reducing transmission loss. Thus, the extension section 13 is configured as a multi-stage power divider group, which improves the insertion loss of the RF unit in a higher frequency band and improves the signal transmission and reception accuracy of the RF unit.

[0122] In some embodiments, Fig.14 As shown, the radar assembly includes a first connecting plate 51 and a second connecting plate 52, the first connecting plate 51 includes a plurality of first bodies 31, and the second connecting plate 52 includes a plurality of second bodies 32 corresponding to the plurality of first bodies 31. When the first connecting plate 51 and the second connecting plate 52 are assembled, the first bodies 31 and the corresponding second bodies 32 are matched to form a waveguide cavity 1. That is, the plurality of first bodies 31 are integrally formed into the first connecting plate 51, and the plurality of first bodies 31 are integrally formed into the second connecting plate 52.

[0123] Further reference Fig.12, Fig.15 and Fig.16 As shown, the multiple radio frequency units include multiple transmitting units 6 and multiple receiving units 7. The first waveguide ports 11 and the second waveguide ports 12 of the multiple transmitting units 6 are the waveguide inlet and the waveguide outlet, respectively, and the first waveguide ports 11 and the second waveguide ports 12 of the multiple receiving units 7 are the waveguide outlet and the waveguide inlet, respectively. When the radar assembly is in use, the first connecting plate 51 is directed toward the target position to radiate electromagnetic waves using the waveguide outlet, and the reflected electromagnetic waves are received through the waveguide inlet.

[0124] In some embodiments, Fig.12 As shown, the number of the plurality of transmitting units 6 is six and they are arranged horizontally at intervals, and the plurality of waveguide outlets of each transmitting unit 6 are arranged vertically. The spacing between two adjacent transmitting units 6 is 0.5λ×N (eg Fig.12 , where λ is the operating wavelength of the transmitting unit 6 and N is a positive integer. For example, L1 is configured to be 2.5λ, and λ is 3.9 mm (corresponding to a frequency of 77 GHz). The six transmitting units 6 in this embodiment are arranged horizontally, which can increase the scanning angle of the main lobe beam and improve the resolution at the horizontal angle.

[0125] Specifically, the number of receiving units 7 is eight. The eight receiving units 7 are arranged at intervals from the transmitting unit 6, which can increase the frequency difference or time difference between the transmitted electromagnetic wave and the received electromagnetic wave, thereby facilitating the detection of the moving target. Fig.12 As shown, the spacings of the eight receiving units 7 are configured as spacing L1 of 2.5λ, spacing L2 of 3λ, spacing L3 of 1.5λ, spacing L4 of 7λ, and spacing L5 of 5λ. At the same time, the direction of the receiving unit 7 at the lower left is configured to be opposite to the direction of other RF units. Thus, the path difference between the reflected electromagnetic waves to different receiving units 7 is further increased, so that the different receiving units 7 can help calculate the position of the target through the phase difference generated.

[0126] In some embodiments, Figure 13-14 As shown, the radar assembly also includes a radio frequency circuit 8 and a waveguide conversion unit 9. The radio frequency circuit 8 includes a signal transmitting end and a signal receiving end. The waveguide conversion unit 9 is arranged between the second connecting plate 52 and the radio frequency circuit 8. The waveguide outlets of multiple transmitting units 6 and the waveguide inlet of the receiving unit 7 are formed on the board surface of the first connecting plate 51 away from the second connecting plate 52. The waveguide inlet of multiple transmitting units 6 and the waveguide outlet of the receiving unit 7 are formed on the board surface of the second connecting plate 52 away from the first connecting plate 51, and the waveguide inlet and the waveguide outlet are respectively connected to the signal transmitting end and the signal receiving end through the waveguide conversion unit 9. As a result, it is convenient to install the radar assembly and adjust the installation direction of the radar assembly.

[0127] Optionally, the RF circuit 8 includes a RF chip, a signal line and a coupling probe, and the RF chip is connected to the waveguide conversion part 9 through the signal line (such as a microstrip line) and the coupling probe (the coupling probe extends into the inner cavity of the waveguide conversion part 9 and couples with each other). Thus, the guided electromagnetic wave generated by the RF chip is coupled to the waveguide conversion part 9, and the waveguide conversion part 9 then conducts the electromagnetic wave to the waveguide cavity 1.

[0128] Fig.17 2 is a schematic diagram of the structure of the vehicle of this embodiment. The dashed line frame in the figure shows the installation position of the radar component.

[0129] The radar assembly in the above embodiment can be applied to vehicles, such as Fig.17 As shown, the vehicle has the ability to detect surrounding targets. The radar component can be set at the front, rear or top of the vehicle. For example, the radar component is used to detect targets within 250m in front of or behind the vehicle. At the same time, the isolation of each port is greater than 48dB, ensuring that the signals of each port will not interfere with each other.

[0130] In summary, in the vehicle of this embodiment, the first body 31 and the second body 32 of the radar assembly are matched together to form a waveguide cavity 1. Thus, the processing technology of the waveguide cavity 1 is simplified. The waveguide cavity 1 includes a first waveguide port 11, a second waveguide port 12, and an extension section 13 connected between the first waveguide port 11 and the second waveguide port 12 for electromagnetic wave conduction, thereby reducing transmission loss. Thus, the extension section 13 is configured as a multi-stage power divider group, which improves the insertion loss of the RF unit at a higher frequency band and improves the signal transmission and reception accuracy of the RF unit.

[0131] Specifically, the multiple transmitting units 6 in this embodiment are arranged horizontally at intervals to ensure that the multiple main lobe beams generated by the multiple transmitting units 6 have a certain width in the horizontal direction (angle Φ) after being superimposed, thereby ensuring the accuracy of detection.

[0132] Fig.18 4 is a schematic diagram of simulation of return loss of this embodiment. Fig.19 : is a schematic diagram of the radiation gain simulation at different frequencies of this embodiment. It can be seen from the figure that in the 74GHz to 79GHz frequency band, the return loss of the RF unit is below -15dB. At the same time, in the 72GHz to 83GHz frequency band, the gain of the RF unit is above 14dB. Therefore, the signal strength of the RF unit in this embodiment can meet the needs of transmission and reception.

[0133] Fig. 20It is a schematic diagram of the radiation gain simulation in different directions of this embodiment. Taking the angle θ in the figure as an example (that is, the pitch angle), the gain of the main lobe can reach 18dB, and the width of the main lobe I reaches 30 degrees. The gain of the first side lobe II adjacent to it is only -4.5dB, making the gain difference between the two reach more than 20dB. In this way, the interference of the side lobe beam to the main lobe beam is avoided, and the radar component is prevented from misjudgment.

[0134] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A radio frequency unit, characterized in that: The radio frequency unit comprises: A first body (31); and a second body (32) which is matched with the first body (31) to form a waveguide cavity (1), wherein the waveguide cavity (1) comprises an extension section (13), a first waveguide opening (11) and a plurality of second waveguide openings (12), wherein the extension section (13) extends from the first waveguide opening (11) to the plurality of second waveguide openings (12); The extension section (13) comprises a plurality of power dividers (2) in the extension direction, and the power dividers (2) have a first connection end (21) and two second connection ends (22); the plurality of power dividers (2) are connected to form a multi-stage power divider group, and the second connection end (22) of the power divider (2) of the previous stage is connected to the first connection end (21) of the power divider (2) of the next stage.

2. The radio frequency unit according to claim 1, characterized in that: The plurality of power dividers (2) include a first power divider (2a) and a second power divider (2b), and the first power divider (2a) and the second power divider (2b) are at the same level, and the second connecting ends (22) of the first power divider (2a) and the second power divider (2b) are connected to form a merging area (23), and the merging area (23) is connected to a part of the plurality of second waveguide ports (12).

3. The radio frequency unit according to claim 2, characterized in that: The plurality of second waveguide ports (12) are arranged at intervals; The second connecting ends (22) on the side where the first power divider (2a) and the second power divider (2b) are close to each other are connected to form the merging area (23), and the merging area (23) is connected to the second waveguide port (12) in the middle area, and the two second connecting ends (22) on the side where the first power divider (2a) and the second power divider (2b) are far away from each other are respectively connected to the second waveguide ports (12) in the two side areas.

4. The radio frequency unit according to claim 3, characterized in that: The plurality of power dividers (2) include a plurality of third power dividers (2c) arranged at intervals, wherein the third power dividers (2c) are located at a subsequent stage of the first power divider (2a), and the plurality of second connection ends (22) of the plurality of third power dividers (2c) are respectively connected to the plurality of second waveguide ports (12) correspondingly.

5. The radio frequency unit according to claim 4, characterized in that: The first connection end (21) of the third power divider (2c) located in the middle area is connected to the merging area (23), and the first connection end (21) of the third power divider (2c) located in the two side areas is respectively connected to two second connection ends (22) on the side away from each other of the first power divider (2a) and the second power divider (2b).

6. The radio frequency unit according to claim 4, characterized in that: The first body (31) has a first groove (33) and the plurality of second waveguide openings (12), and the second waveguide openings (12) penetrate the first body (31) and are connected to the first groove (33); The second body (32) has a second groove (34), and the first waveguide opening (11) passes through the second body (32) and is connected to the second groove (34); The first groove (33) and the second groove (34) are combined to form the waveguide cavity (1).

7. The radio frequency unit according to claim 6, characterized in that: The second body (32) comprises a plurality of first bosses (35), the plurality of first bosses (35) being protruding from the bottom of the second groove (34) and respectively corresponding to the plurality of second waveguide openings (12), the height of the first boss (35) being less than the depth of the second groove (34), and in the extension direction of the extension section (13), the first boss (35) being away from the first waveguide opening (11).

8. The radio frequency unit according to claim 7, characterized in that: The second body (32) comprises a second boss (38), the second boss (38) being protruding from the bottom of the first groove (33) and being arranged corresponding to the first waveguide opening (11), the height of the second boss (38) being smaller than the depth of the first groove (33), and in the extension direction of the extension section (13), the second boss (38) being arranged away from the second waveguide opening (12).

9. The radio frequency unit according to claim 5, characterized in that: The multi-stage power divider group is a three-stage power divider group, and the three-stage power divider group comprises a first-stage fourth power divider (2d), a second-stage first power divider (2a), a second-stage second power divider (2b), and three third-stage third power dividers (2c); The transmission power of each of the second waveguide ports (12) corresponding to the merging area (23) is 54% of the transmission power of the first waveguide port (11).

10. The radio frequency unit according to claim 6, characterized in that: The first groove (33) comprises a middle groove (331) and a plurality of branch grooves (332), wherein the plurality of branch grooves (332) extend from the middle groove (331) toward the second waveguide port (12), a stopper (333) is protrudingly provided in the middle of the middle groove (331), a side surface of the stopper (333) is spaced apart from a side surface of the middle groove (331), and the side surface of the stopper (333) forms part of the confluence area (23).

11. The radio frequency unit according to claim 9, characterized in that: The power divider (2) comprises a first extension section (131), a second extension section (132) and a third extension section (133); one end of the second extension section (132) and the third extension section (133) respectively form the two second connection ends (22), and the other end is simultaneously connected to one end of the first extension section (131); the other end of the first extension section (131) forms the first connection end (21); The two second extension sections (132) of the first power divider (2a) and the second power divider (2b) are connected to form the merging area (23), and the cross-sectional area of ​​the end of the second extension section (132) away from the second waveguide port (12) is larger than the cross-sectional area of ​​the end of the third extension section (133) away from the second waveguide port (12).

12. The radio frequency unit according to claim 11, characterized in that: The second extension section (132) and the third extension section (133) of the third power divider (2c) located in the middle are mirror-symmetrical with respect to the first extension section (131); The third power divider (2c) is located on both sides, the two second extension sections (132) are located between the two third extension sections (133), and the cross-sectional area of ​​the end of the second extension section (132) away from the second waveguide port (12) is larger than the cross-sectional area of ​​the end of the third extension section (133) away from the second waveguide port (12).

13. The radio frequency unit according to any one of claims 1 to 12, characterized in that: The operating frequency band of the radio frequency unit is between 74 GHz and 79 GHz.

14. A radar assembly, characterized in that: The radar assembly comprises: A plurality of radio frequency units, the radio frequency units comprising a first body (31) and a second body (32), the second body (32) and the first body (31) being combined to form a waveguide cavity (1), the waveguide cavity (1) comprising an extension section (13), a first waveguide port (11) and a plurality of second waveguide ports (12), the extension section (13) extending from the first waveguide port (11) to the plurality of second waveguide ports (12); The extension section (13) comprises a plurality of power dividers (2) in the extension direction, and the power dividers (2) have a first connection end (21) and two second connection ends (22), the plurality of power dividers (2) are connected to form a multi-stage power divider (2) group, and the second connection end (22) of the power divider (2) of the previous stage is connected to the first connection end (21) of the power divider (2) of the next stage; The plurality of power dividers (2) include a first power divider (2a) and a second power divider (2b), and the first power divider (2a) and the second power divider (2b) are at the same level, and the second connecting ends (22) of the first power divider (2a) and the second power divider (2b) are connected to form a merging area (23), and the merging area (23) is connected to at least part of the plurality of second waveguide ports (12).

15. The radar assembly according to claim 14, characterized in that The radar assembly comprises a first connecting plate (51) and a second connecting plate (52), the first connecting plate (51) comprising a plurality of the first bodies (31), and the second connecting plate (52) comprising a plurality of second bodies (32) respectively corresponding to the plurality of the first bodies (31); The first connecting plate (51) and the second connecting plate (52) are assembled, the first body (31) and the corresponding second body (32) are assembled to form the waveguide cavity (1), the plurality of radio frequency units include a plurality of transmitting units (6) and a plurality of receiving units (7), the first waveguide ports (11) and the second waveguide ports (12) of the plurality of transmitting units (6) are the waveguide inlet and the waveguide outlet, respectively, and the first waveguide ports (11) and the second waveguide ports (12) of the plurality of receiving units (7) are the waveguide outlet and the waveguide inlet, respectively.

16. The radar assembly according to claim 15, characterized in that The number of the plurality of transmitting units (6) is six and they are arranged horizontally at intervals, the plurality of waveguide outlets of each transmitting unit (6) are arranged vertically, and the spacing between two adjacent transmitting units (6) is 0.5λ×N, wherein λ is the operating wavelength of the transmitting unit (6) and N is a positive integer.

17. The radar assembly according to claim 16, characterized in that The detection range of the radar assembly is configured to be 250m.

18. The radar assembly according to claim 16, characterized in that The radar assembly further comprises: A radio frequency circuit (8), comprising a signal transmitting end and a signal receiving end; A waveguide conversion portion (9) is arranged between the second connecting plate (52) and the radio frequency circuit (8); The waveguide outlets of the plurality of transmitting units (6) and the waveguide inlet of the receiving unit (7) are formed on a plate surface of the first connecting plate (51) facing away from the second connecting plate (52); The input waveguide ports of the plurality of transmitting units (6) and the output waveguide ports of the receiving unit (7) are formed on the plate surface of the second connecting plate (52) facing away from the first connecting plate (51), and the input waveguide ports and the output waveguide ports are respectively communicatively connected with the signal transmitting end and the signal receiving end through the waveguide conversion part (9).

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