Radio frequency unit and radar assembly

Abstract

The embodiment of the utility model 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] This utility model relates to the field of radar technology, and in particular to a radio frequency unit and radar assembly. Background Technology

[0002] Millimeter-wave radar utilizes electromagnetic waves for detection. Its high resolution, small size, and anti-jamming capabilities make it applicable to various fields. However, antennas fabricated using microstrip antennas or substrate integrated waveguides (SIW) suffer from significant transmission loss and complex manufacturing processes. Reducing transmission loss and manufacturing complexity are therefore pressing issues that need to be addressed. Utility Model Content

[0003] In view of this, the present invention provides a radio frequency unit and a radar assembly that utilizes a waveguide cavity to conduct electromagnetic waves, thereby reducing transmission loss and processing difficulty.

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

[0005] The first entity; and

[0006] The second body is mated with the first body to form a waveguide cavity. The inner wall of the waveguide cavity is provided with a conductive layer. The waveguide cavity includes an extension section, a first waveguide port, and a plurality of second waveguide ports. The extension section extends from the first waveguide port to the plurality of second waveguide ports.

[0007] The extended section includes multiple power dividers in the extended direction, and each power divider has a first connection terminal and two second connection terminals. The multiple power dividers are connected to form a multi-stage power divider group, and the second connection terminal of the power divider of the previous stage is connected to the first connection terminal of the power divider of the next stage.

[0008] Furthermore, the plurality of 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 connection ends of the first power divider and the second power divider are connected to form a merging area, and the merging area is connected to a portion of the plurality of second waveguide ports.

[0009] Furthermore, the plurality of second waveguide ports are arranged at intervals;

[0010] The first power divider and the second power divider are connected at their respective second connection ends on the side closest to each other to form the merging area, and the merging area is connected to the second waveguide port in the middle area. The two second connection ends of the first power divider and the second power divider on the side furthest from each other are respectively connected to the second waveguide ports 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 being located one stage after the first power divider, and the plurality of second connection terminals of the plurality of third power dividers being respectively connected to the plurality of second waveguide ports.

[0012] Furthermore, the first connection terminal of the third power divider located in the middle region is connected to the confluence area, and the first connection terminal of the third power divider located in the two side regions is connected to two second connection terminals of the first power divider and the second power divider located on opposite sides.

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

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

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

[0016] Furthermore, the second body includes a plurality of first protrusions, which are protruding from the bottom of the second groove and respectively corresponding to the plurality of second waveguide ports. The height of the first protrusion is less than the depth of the second groove, and in the extension direction of the extension interval, the first protrusion is far away from the first waveguide port.

[0017] Furthermore, the second body includes a second boss, which protrudes from the bottom of the first groove and is correspondingly disposed to the first waveguide port. The height of the second boss is less than the depth of the first groove, and in the extension direction of the extension range, the second boss is disposed away from the second waveguide port.

[0018] Furthermore, the multi-stage power divider group is a three-stage power divider group, which 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 second waveguide port corresponding to the confluence area is 54% of the transmission power of the first waveguide port.

[0020] Furthermore, the first groove includes a central groove and multiple branch grooves, the multiple branch grooves extending from the central groove toward the second waveguide port, a baffle protruding from the center of the central groove, the side of the baffle being spaced apart from the side of the central groove, and the side of the baffle forming part of the confluence area.

[0021] Furthermore, 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 terminals, and the other end is simultaneously connected to one end of the first extension section. The other end of the first extension section forms the first connection terminal.

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

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

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

[0025] Furthermore, the radio frequency unit operates in the frequency band of 74 GHz to 79 GHz.

[0026] Secondly, this utility model embodiment also provides a radar assembly, the radar assembly comprising:

[0027] Multiple radio frequency (RF) units, each RF unit including a first body and a second body, the second body and the first body being coupled together to form a waveguide cavity, the waveguide cavity including an extension section, a first waveguide port and multiple second waveguide ports, the extension section extending from the first waveguide port to the multiple second waveguide ports;

[0028] The extended section includes multiple power dividers in the extended direction, and each power divider has a first connection terminal and two second connection terminals. The multiple power dividers are connected to form a multi-stage power divider group, and the second connection terminal of the power divider of the previous stage is connected to the first connection terminal of the power divider of the next stage.

[0029] The plurality of 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 connection ends of the first power divider and the second power divider are connected to form a merging area, and the merging area is in communication with at least a portion of the plurality of second waveguide ports.

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

[0031] The first connecting plate and the second connecting plate are assembled together, and the first body and the corresponding second body are mated to form the waveguide cavity. The plurality of radio frequency units include a plurality of transmitting units and a plurality of receiving units. The first waveguide port and the second waveguide port of the plurality of transmitting units are respectively the inlet waveguide port and the outlet waveguide port. The first waveguide port and the second waveguide port of the plurality of receiving units are respectively the outlet waveguide port and the inlet waveguide port.

[0032] Furthermore, the number of the plurality of transmitting units is six and arranged horizontally at intervals, the plurality of waveguide ports of each transmitting unit are arranged vertically, and the distance between two adjacent transmitting units is 0.5λ×N, where λ is the operating wavelength of the transmitting unit and N is a positive integer.

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

[0034] Furthermore, the radar assembly also includes:

[0035] Radio frequency circuits, including signal transmitters and signal receivers;

[0036] A waveguide conversion section is 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 the surface of the first connecting plate opposite to the second connecting plate;

[0038] The waveguide inlet of the plurality of transmitting units and the waveguide outlet of the receiving unit are formed on the surface of the second connecting plate opposite to the first connecting plate, and the waveguide inlet and the waveguide outlet are respectively communicatively connected to the signal transmitting end and the signal receiving end through the waveguide conversion part.

[0039] In this embodiment, the radio frequency unit and radar assembly combine a first body and a second body to form a waveguide cavity. This simplifies the fabrication process of the waveguide cavity. The waveguide cavity includes a first waveguide port, a second waveguide port, and an extension section connecting the first and second waveguide ports for electromagnetic wave conduction, thereby reducing transmission loss. Furthermore, configuring the extension section as a multi-stage power divider improves the insertion loss of the radio frequency unit at higher frequencies and enhances the signal transmission and reception accuracy of the radio frequency unit. Attached Figure Description

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

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

[0042] Figure 2 This is a schematic diagram of the structure of the radio frequency unit on the other side of this utility model embodiment;

[0043] Figure 3 This is an exploded view of the radio frequency unit according to an embodiment of the present invention;

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

[0045] Figure 5 This is a schematic diagram of the structure of the other side of the second body in an embodiment of this utility model;

[0046] Figure 6 This is a schematic diagram of one side of the first body according to an embodiment of the present utility model;

[0047] Figure 7 This is a schematic diagram of the other side of the first body in an embodiment of this utility model;

[0048] Figure 8 yes Figure 1 Schematic diagram of the cross section at point AA;

[0049] Figure 9 yes Figure 2 Schematic diagram of the cross section at point BB;

[0050] Figure 10 yes Figure 1 Schematic diagram of cross-section at CC;

[0051] Figure 11 This is a schematic diagram of the waveguide cavity structure according to an embodiment of the present invention;

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

[0053] Figure 13 This is a schematic diagram of the structure of the radar assembly on the other side of this utility model embodiment;

[0054] Figure 14 This is a structural schematic diagram of another side of the radar component according to an embodiment of the present invention;

[0055] Figure 15 This is a schematic diagram of the structure of the first connecting plate in an embodiment of this utility model;

[0056] Figure 16 This is a schematic diagram of the structure of the second connecting plate according to an embodiment of the present utility model;

[0057] Figure 17This is a structural schematic diagram of the vehicle according to an embodiment of the present utility model;

[0058] Figure 18 This is a simulation diagram of the return loss according to an embodiment of the present invention;

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

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

[0061] Explanation of reference numerals in the attached figures:

[0062] 1-Waveguide cavity;

[0063] 11-First waveguide port; 12-Second waveguide port; 13-Extension section; 131-First extension segment; 132-Second extension segment; 133-Third extension segment;

[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-Intermediate groove; 332-Branch groove; 333-Baffle; 34-Second groove; 35-First boss; 36-Step hole; 37-Third groove; 38-Second boss; 39-Baffle wall;

[0068] 51-First connecting plate; 52-Second connecting plate;

[0069] 6- Launching unit;

[0070] 7-Receiving unit;

[0071] 8-RF circuit;

[0072] 9-Waveguide conversion section. Detailed Implementation

[0073] The present invention will now be described based on embodiments, but it is not limited to these embodiments. In the following detailed description of the present invention, certain specific details are described in detail. Those skilled in the art will fully understand the present invention even without these details. To avoid obscuring the essence of the present invention, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0074] 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.

[0075] 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".

[0076] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0077] Unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0078] 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.

[0079] Figure 1 and Figure 2 This is a schematic diagram of the radio frequency unit in this embodiment. Figure 3 This is an exploded view of the radio frequency unit in this embodiment.

[0080] In some implementations, such as Figures 1-3As 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 (e.g., reflow soldering or diffusion soldering) or by screws. The first body 31 and the second body 32 can be made of conductive materials, such as aluminum alloy or permalloy, which can conduct electromagnetic waves and heat.

[0081] Figure 4 and Figure 5 This is a schematic diagram of the structure of the second body 32 in this embodiment. Figure 6 and Figure 7 This is a schematic diagram of the first body 31 in this embodiment. Figure 8 and Figure 9 This is a cross-sectional schematic diagram of the radio frequency unit in this embodiment. Figure 7 The corresponding position of the first waveguide port 11 is shown in the dashed box.

[0082] In some implementations, such as Figures 4-9 As shown, in this embodiment, the first body 31 and the second body 32 are generally plate-shaped structures. The first body 31 has a first plate surface, and the second body 32 has a second plate surface opposite to the first plate surface. After the first body 31 and the second body 32 are joined together through the first plate surface and the second plate surface, a waveguide cavity 1 is formed on their opposite sides. A conductive layer is arranged on the inner wall of the waveguide cavity 1.

[0083] Optionally, a recessed area is formed on the first plate surface, and the second plate surface is flat. The second plate surface covers the top of the recessed area to form waveguide cavity 1. Alternatively, a recessed area is formed on the second plate surface, and the first plate surface is set as flat, with the first plate surface covering the top of the recessed area to form waveguide cavity 1.

[0084] Figure 10 This is a cross-sectional view of one side of the radio frequency unit in this embodiment. A portion of the first body 31 has been cut away from the radio frequency unit in the figure. Figure 11 This is a schematic diagram of the waveguide cavity 1 in this embodiment. The outlines of the first power divider 2a and the second power divider 2b are shown with dashed 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 a dotted line.

[0085] In some implementations, such as Figures 8-11 As shown, the waveguide cavity 1 includes an extension section 13, a first waveguide port 11, and a plurality of second waveguide ports 12. The extension section 13 extends from the first waveguide port 11 to the plurality of second waveguide ports 12. As a result, electromagnetic waves fed into the waveguide cavity 1 from the first waveguide port 11 are continuously reflected along the inner wall of the waveguide cavity 1 to form standing waves.

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

[0087] Further reference Figure 11 As shown, the extension section 13 includes multiple power dividers 2 in the extension direction, and each power divider 2 has a first connection terminal 21 and two second connection terminals 22. In this embodiment, the power divider 2 can be equivalent to a T-type power splitter. The two second connection terminals 22 are the two output terminals of the T-type power splitter, and the first connection terminal 21 is the input terminal of the T-type power splitter. After passing through the power divider 2, the electromagnetic wave is split into two paths and continues to propagate in the waveguide cavity 1.

[0088] Further reference Figure 11 As shown, multiple power dividers 2 are connected to form a multi-stage power divider group, and the second connection terminal 22 of the previous stage power divider 2 is connected to the first connection terminal 21 of the next stage power divider 2. That is, in the extension direction of the extension interval 13, in two adjacent stages of power dividers 2, the two second connection terminals 22 of the power divider 2 closer to the first waveguide port 11 are respectively connected to the two first connection terminals 21 of the two power dividers 2 farther away from the first waveguide port 11.

[0089] In summary, the radio frequency unit in this embodiment combines the first body 31 and the second body 32 to form a waveguide cavity 1. This simplifies the fabrication process of the waveguide cavity 1. The waveguide cavity 1 includes a first waveguide port 11, a second waveguide port 12, and an extension section 13 connecting the first waveguide port 11 and the second waveguide port 12 for electromagnetic wave conduction, thereby reducing transmission loss. Furthermore, configuring the extension section 13 as a multi-stage power divider group improves the insertion loss of the radio frequency unit at higher frequencies and enhances the signal transmission and reception accuracy of the radio frequency unit.

[0090] Optionally, the multi-stage power divider group can be two, three, four, or more stages, which can be selected by those skilled in the art according to conditions such as the power or beamform of the transmitted and received electromagnetic waves. Meanwhile, the number of power dividers 2 can also be adjusted according to requirements, for example, 6, 14, or more.

[0091] Simultaneously, multiple power dividers 2 include a first power divider 2a and a second power divider 2b, with the first power divider 2a and the second power divider 2b being at the same level. The second connection terminals 22 of the first power divider 2a and the second power divider 2b are connected to form a merging region 23. The merging region 23 is at least partially connected to one of the multiple second waveguide ports 12. Thus, when electromagnetic waves pass through the merging region 23 from the first power divider 2a and the second power divider 2b, the electromagnetic waves are superimposed after passing through the two second connection terminals 22. This increases the transmit and receive power of the second waveguide ports 12 connected to the merging region 23, and when the beams of the multiple second waveguide ports 12 are superimposed, the radiation gain of the second waveguide ports 12 connected to the merging region 23 is also increased, resulting in a longer radiation distance for the main lobe beam. Furthermore, the radiation gain of the second waveguide ports 12 that are offset from the merging region 23 is relatively reduced, which can avoid interference from the sidelobe beams on the detection of the main lobe beam. That is, under the premise of ensuring that the amplitude of the electromagnetic waves transmitted and received by each second waveguide port 12 is different to avoid the situation where the electromagnetic waves of each second waveguide port 12 are out of phase, so as to avoid the situation where multiple second waveguide ports 12 cannot be further superimposed.

[0092] Connecting the second connection terminals 22 of the first power divider 2a and the second power divider 2b, which are at the same level, forms a merging region 23. The power of the electromagnetic waves superimposed in the merging region 23 is further enhanced. This increases the radiation gain of the second waveguide port 12 connected to the merging region 23 and relatively reduces the radiation gain of the second waveguide port 12 that is offset from the merging region 23. This allows the main lobe beam to radiate over a longer distance, resulting in more accurate detection, while simultaneously reducing interference from the sidelobe beams on the main lobe beam detection.

[0093] In some implementations, such as Figures 10-11 As shown, multiple second waveguide ports 12 are arranged at intervals. The spacing between the multiple 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, which are close to each other on one side, are connected to form a confluence area 23, and the confluence area 23 is connected to the second waveguide port 12 in the middle region. The two second connection ends 22 of the first power divider 2a and the second power divider 2b, which are far apart from each other on one side, are respectively connected to the second waveguide ports 12 in the two side regions.

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

[0095] In some implementations, such as Figure 11As shown, the multiple power dividers 2 include multiple third power dividers 2c arranged at intervals. The third power dividers 2c are located after the first power divider 2a and the second power divider 2b. Multiple second connection terminals 22 on the multiple third power dividers 2c are respectively connected to multiple second waveguide ports 12 in a one-to-one correspondence. That is, each second waveguide port 12 corresponds to one second connection terminal 22 of a third power divider 2c. Thus, by using multiple third power dividers 2c, the multiple second waveguide ports 12 can be distributed at intervals, ensuring the radiation angle of the electromagnetic waves.

[0096] In some implementations, such as Figure 11 As shown, the first connection terminal 21 of the third power divider 2c located in the middle area is connected to the confluence area 23, and the first connection terminal 21 of the third power divider 2c located in the two side areas is connected to two second connection terminals 22 of the first power divider 2a and the second power divider 2b that are far away from each other.

[0097] Specifically, in this embodiment, the multiple second waveguide ports 12 form multiple pairs of second waveguide ports 12. 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 the pair of second waveguide ports 12 corresponding to the merging region 23 is guaranteed to be consistent. As a result, the width of the main lobe beam is increased, and the detection area of ​​the main lobe beam is improved.

[0098] In some implementations, such as Figures 3-7 As shown, the first body 31 has a first groove 33 and multiple second waveguide openings 12, with the second waveguide openings 12 penetrating the first body 31 and connecting to the first groove 33. The second body 32 has a second groove 34, with the first waveguide openings 11 penetrating the second body 32 and connecting to the second groove 34. The first groove 33 and the second groove 34 mate to form a waveguide cavity 1. This ensures that the depths of the first groove 33 and the second groove 34 are within a certain range, guaranteeing the machining accuracy of the milling cutter.

[0099] Specifically, the second waveguide port 12 is located at the bottom of the first groove 33, at the end furthest from the first waveguide port 11. The first waveguide port 11 is located at the bottom of the second groove 34, at the end furthest from the second waveguide port 12. When the first groove 33 and the second groove 34 are aligned, the orientation of the first waveguide port 11 and the second waveguide port 12 is perpendicular to the extension direction of the extension section 13. Thus, electromagnetic waves within the waveguide cavity 1 can change their propagation direction, allowing the second waveguide port 12 to face the target location, facilitating the transmission and reception of electromagnetic waves by the radio frequency unit.

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

[0101] In some implementations, such as Figure 4 , Figure 5 , Figure 8 and Figure 10 As shown, the second body 32 includes a plurality of first protrusions 35. The plurality of first protrusions 35 protrude from 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 protrusions 35 is less than the depth of the second groove 34 (see details). Figure 8 (See enlarged view), and in the extension direction of the extension interval 13, the first protrusion 35 is far away from the first waveguide port 11. Thus, the direction of electromagnetic wave propagation can be changed by the first protrusion 35, so that the electromagnetic wave propagates in a direction perpendicular to the extension interval 13.

[0102] Preferably, a portion of the second waveguide port 12 corresponds to the edge region of the first groove 33. This allows the electromagnetic wave propagation cross-sectional area to gradually increase, facilitating the transmission or reception of electromagnetic waves. Simultaneously, it improves the performance parameters of the radio frequency unit.

[0103] In some implementations, such as Figure 6 , Figure 7 and Figure 9 As shown, the second body 32 includes a second boss 38. The second boss 38 protrudes from the bottom of the first groove 33 and is correspondingly disposed to the first waveguide port 11. The height of the second boss 38 is less than the depth of the first groove 33 (see details). Figure 9 Furthermore, in the extension direction of the extension interval 13, the second protrusion 38 is positioned away from the second waveguide port 12. Therefore, when an electromagnetic wave is fed into the first waveguide port 11, the propagation direction of the electromagnetic wave can be changed, allowing the electromagnetic wave to propagate along the plane containing the extension interval 13. Further adjustment of the S11 parameter reduces energy reflection at the location of the first waveguide port 11.

[0104] Specifically, a portion of the second waveguide port 12 is projected onto the second body 32, located outside the first groove 33. This allows electromagnetic waves to change their propagation direction, propagating along a direction perpendicular to the extension section 13. The cross-sectional area of ​​its propagation can be gradually increased to facilitate the transmission or reception of electromagnetic waves. Simultaneously, this improves the performance parameters of the radio frequency unit.

[0105] Preferably, such as Figure 8 As shown, a third groove 37 is formed on the side of the first body 31 away from the second body 32, and a stepped hole 36 is formed at the bottom of the third groove 37, penetrating the first body 31. The small-diameter section of the stepped hole 36 is used to form the second waveguide port 12, and the large-diameter section is connected to the third groove 37. Thus, by using the third groove 37 in conjunction with the stepped hole 36, the transmit and receive gain of the RF unit is improved, and the radiation efficiency is increased.

[0106] In some implementations, such as Figure 11 As shown, the multi-stage power divider group is a three-stage power divider group, which 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 confluence area 23 is configured to be 54% of the transmission power of the first waveguide port 11.

[0107] Preferably, the waveguide cavity 1 further includes a main branch 2e. The main branch 2e extends in a straight line 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 terminal 21 of the fourth power divider 2d, and the other end is connected to the first waveguide port 11.

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

[0109] The power of the first connection terminal 21 of the fourth power divider 2d located in the middle is 54% of the power of the first waveguide port 11, and the power of each of the two second connection terminals 22 is 27% of the power of the first waveguide port 11. In the two fourth power dividers 2d located on either side, the power of the first connection terminal 21 is 23% of the power of the first waveguide port 11; the power of the two first connection terminals 21 that are far apart from each other is 7% of the power of the first waveguide port 11, and the power of the two first connection terminals 21 that are close to each other is 16% of the power of the first waveguide port 11.

[0110] That is, the transmission power of the six second waveguide ports 12, from left to right, is 7%, 16%, 27%, 27%, 16%, and 7% of that of the first waveguide port 11, respectively. Therefore, in this embodiment, the superposition effect of the electromagnetic waves by the confluence area 23 ensures that the power allocated to the second waveguide ports 12 farther from the middle third power divider 2c is lower, guaranteeing the detection accuracy of the RF unit and avoiding interference with surrounding equipment.

[0111] In some implementations, such as Figure 5As shown, the first groove 33 includes a central groove 331 (the area of ​​the central groove 331 is shown in cross-section) and multiple branch grooves 332. The multiple branch grooves 332 extend from the central groove 331 toward the second waveguide port 12. A baffle 333 is protruding from the middle of the central groove 331. The side of the baffle 333 is spaced apart from the side of the central groove 331, and the side of the baffle 333 forms a partial confluence area 23.

[0112] Optionally, such as Figure 7 As shown, the second groove 34 includes a central groove 331 (the area of ​​the central groove 331 is shown in cross-section) and multiple branch grooves 332, making the form of the second groove 34 similar to that of the first groove 33. The configuration of the first groove 33 and the second groove 34 in this embodiment reduces machining difficulty, allowing the milling cutter to perform cutting motion along the circumference of the stop 333, thereby accelerating the machining speed of the first body 31 and the second body 32.

[0113] In some implementations, such as Figures 10-11 As shown, the power divider 2 includes a first extension 131, a second extension 132, and a third extension 133 that are interconnected. The ends of the second extension 132 and the third extension 133 that are away from the first extension 131 respectively form two second connection terminals 22, and the other ends are simultaneously connected to one end of the first extension 131. The other end of the first extension 131 forms a first connection terminal 21.

[0114] The two second extension segments 132 of the first power divider 2a and the second power divider 2b are connected to form a merging region 23. The cross-sectional area of ​​the end of the second extension segment 132 of the first power divider 2a away from the second waveguide port 12 is larger than the cross-sectional area of ​​the end of the third extension segment 133 away from the second waveguide port 12. Similarly, the cross-sectional area of ​​the end of the second extension segment 132 of the second power divider 2b away from the second waveguide port 12 is larger than the cross-sectional area of ​​the end of the third extension segment 133 away from the second waveguide port 12. Therefore, by configuring the apertures of the ends of the second extension segments 132 and the third extension segment 133 connected to the first extension segment 131 to be different, the two second connection ends 22 can receive different power during power distribution, resulting in greater power in the merging region 23 and further improving the gain amplitude of the main lobe beam.

[0115] In some implementations, such as Figure 11As shown, the second extension segment 132 and the third extension segment 133 of the third power divider 2c located in the middle are mirror-symmetrical with respect to the confluence region 23. In the third power dividers 2c located on both sides, the two second extension segments 132 are located between the two third extension segments 133, and the cross-sectional area of ​​the end of the second extension segment 132 away from the second waveguide port 12 is larger than the cross-sectional area of ​​the end of the third extension segment 133 away from the second waveguide port 12. Thus, by configuring the apertures of the ends of the second extension segments 132 and the third extension segments 133 connected to the first extension segment 131 in the third power dividers 2c on both sides to be different, the power can be further distributed, resulting in less transmission power to the second waveguide ports 12 on both sides, thereby improving the detection accuracy of the radar component. In contrast, the aperture variation range of the second extension segments 132 and the third extension segments 133 corresponding to the confluence region 23 is configured to be the same, that is, the second extension segments 132 and the third extension segments 133 are radially symmetrical with respect to the first extension segment 131. This ensures 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 implementations, such as Figures 10-11 As shown, multiple baffles 39 protrude from the branch slots 332 of the first groove 33 and the second groove 34. When the first groove 33 and the second groove 34 are aligned, the upper and lower baffles 39 abut against each other, causing the baffles 39 to separate the branch slots 332 into a second extension segment 132 and a third extension segment 133. The baffle 39 in the middle position corresponds to the confluence area 23. The baffles 39 on both sides are offset to the sides of the middle baffle 39 so that the connection diameters of the second extension segment 132 and the third extension segment 133 are different. Thus, the use of multiple baffles 39 can simplify the cutting work of the milling cutter and improve the machining accuracy. Those skilled in the art can adjust the power distribution by changing the position of the baffles 39.

[0117] Furthermore, the cross-sectional areas of the second extension segment 132 and the third extension segment 133 of the fourth power divider 2d change in the same way, that is, the second extension segment 132 and the third extension segment 133 are symmetrically arranged with respect to the confluence region 23. As a result, the waveform of the electromagnetic wave can remain symmetrical in the arrangement direction of the multiple second waveguide ports 12.

[0118] Figures 12-14 This is a schematic diagram of the radar component in this embodiment. Figure 14 Only a portion of the second waveguide port 12 is shown in the image. Figure 15 This is a schematic diagram of the structure of the first connecting plate 51 in this embodiment. Figure 16 This is a schematic diagram of the structure of the second connecting plate 52 in this embodiment. Figure 15 The image shows the side of the first connecting plate 51 that faces away from the second connecting plate 52. Figure 16The image shows the side of the second connecting plate 52 that is opposite to the first connecting plate 51.

[0119] In some implementations, such as Figure 12 As shown, the radar component in this embodiment includes multiple radio frequency units. Further referencing... Figures 1-11 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 coupled 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. 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 each power divider 2 has a first connection terminal 21 and two second connection terminals 22. The plurality of power dividers 2 are connected to form a multi-stage power divider group, and the second connection terminal 22 of the previous stage power divider 2 is connected to the first connection terminal 21 of the next stage power divider 2. 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. The second connection terminals 22 of the first power divider 2a and the second power divider 2b are connected to form a merging region 23, and the merging region 23 is at least partially connected to one of the plurality of second waveguide ports 12.

[0120] Specifically, the multiple radio frequency units in this embodiment can be used to receive or transmit electromagnetic waves. The radar component in this embodiment can be a millimeter-wave radar. The operating frequency of this millimeter-wave radar can be 77 GHz, or it can be 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 radio frequency unit to form a waveguide cavity 1. This simplifies the fabrication process of the waveguide cavity 1. The waveguide cavity 1 includes a first waveguide port 11, a second waveguide port 12, and an extension section 13 connecting the first waveguide port 11 and the second waveguide port 12 for electromagnetic wave conduction, thereby reducing transmission loss. Furthermore, configuring the extension section 13 as a multi-stage power divider group improves the insertion loss of the radio frequency unit at higher frequencies and enhances the signal transmission and reception accuracy of the radio frequency unit.

[0122] In some implementations, such as Figure 14 As shown, the radar assembly includes a first connecting plate 51 and a second connecting plate 52. The first connecting plate 51 includes multiple first bodies 31, and the second connecting plate 52 includes multiple second bodies 32 that correspond one-to-one with the multiple first bodies 31. When the first connecting plate 51 and the second connecting plate 52 are assembled, the first bodies 31 and their corresponding second bodies 32 align to form a waveguide cavity 1. That is, the multiple first bodies 31 are integrally formed to form the first connecting plate 51, and the multiple first bodies 31 are integrally formed to form the second connecting plate 52.

[0123] Further reference Figure 12, Figure 15 and Figure 16 As shown, the multiple radio frequency units include multiple transmitting units 6 and multiple receiving units 7. The first waveguide port 11 and the second waveguide port 12 of the multiple transmitting units 6 are the input waveguide port and the output waveguide port, respectively. The first waveguide port 11 and the second waveguide port 12 of the multiple receiving units 7 are the output waveguide port and the input waveguide port, respectively. In the use of the radar assembly, the first connecting plate 51 is oriented towards the target location to radiate electromagnetic waves using the output waveguide port and receive the reflected electromagnetic waves through the input waveguide port.

[0124] In some implementations, such as Figure 12 As shown, there are six transmitting units 6 arranged horizontally at intervals, and multiple waveguide ports of each transmitting unit 6 are arranged vertically. The spacing between two adjacent transmitting units 6 is 0.5λ×N (e.g., ...). Figure 12 The spacing L1 is shown in the diagram. Here, λ is the operating wavelength of the transmitting unit 6, and N is a positive integer. For example, L1 can be configured as 2.5λ, where λ is 3.9 mm (corresponding to a frequency of 77 GHz). In this embodiment, the six transmitting units 6 are arranged horizontally, which increases the scanning angle of the main lobe beam and improves the horizontal resolution.

[0125] Specifically, there are eight receiving units 7. The eight receiving units 7 are spaced apart from the transmitting unit 6, which increases the frequency difference or time difference between the transmitted and received electromagnetic waves, thus facilitating the detection of moving targets. Furthermore, as... Figure 12 As shown, the eight receiving units 7 are spaced with spacing L1 of 2.5λ, L2 of 3λ, L3 of 1.5λ, L4 of 7λ, and L5 of 5λ. Meanwhile, the receiving unit 7 located in the lower left corner is oriented opposite to the other radio frequency units. This further increases the path difference between the reflected electromagnetic waves and the different receiving units 7, allowing the phase difference generated by the different receiving units 7 to help calculate the position of the target object.

[0126] In some implementations, such as Figures 13-14 As shown, the radar assembly also includes an RF circuit 8 and a waveguide conversion unit 9. The RF circuit 8 includes a signal transmitting end and a signal receiving end. The waveguide conversion unit 9 is disposed between the second connecting plate 52 and the RF circuit 8. The waveguide exit ports of the plurality of transmitting units 6 and the waveguide entrance ports of the receiving units 7 are formed on the surface of the first connecting plate 51 opposite to the second connecting plate 52. The waveguide entrance ports of the plurality of transmitting units 6 and the waveguide exit ports of the receiving units 7 are formed on the surface of the second connecting plate 52 opposite to the first connecting plate 51, and the waveguide entrance ports and the waveguide exit ports are communicatively connected to the signal transmitting end and the signal receiving end respectively through the waveguide conversion unit 9. This facilitates the installation of the radar assembly and the adjustment of the installation direction of the radar assembly.

[0127] Optionally, the radio frequency circuit 8 includes a radio frequency chip, signal lines, and coupling probes. The radio frequency chip is communicatively connected to the waveguide conversion unit 9 via signal lines (e.g., microstrip lines) and coupling probes (the coupling probes extend into the cavity of the waveguide conversion unit 9 and are coupled to each other). Thus, the guided electromagnetic waves generated by the radio frequency chip are coupled to the waveguide conversion unit 9, and the waveguide conversion unit 9 then conducts the electromagnetic waves to the waveguide cavity 1.

[0128] Figure 17 This is a structural schematic diagram of the vehicle in this embodiment. The installation location of the radar component is shown in the figure with a dashed box.

[0129] The radar components in the above embodiments can be applied to vehicles, such as... Figure 17 As shown, this enables the vehicle to detect surrounding targets. The radar assembly can be positioned at the front, rear, or top of the vehicle. For example, the radar assembly can be used to detect targets within a 250m range in front of or behind the vehicle. Simultaneously, the isolation between each port is greater than 48dB, ensuring that the signals from each port do not interfere with each other.

[0130] In summary, in this embodiment, the vehicle assembles the first body 31 and the second body 32 of the radar assembly together to form a waveguide cavity 1. This simplifies the fabrication process of the waveguide cavity 1. The waveguide cavity 1 includes a first waveguide port 11, a second waveguide port 12, and an extension section 13 connecting the first waveguide port 11 and the second waveguide port 12 for electromagnetic wave conduction, thereby reducing transmission loss. Furthermore, configuring the extension section 13 as a multi-stage power divider group improves the insertion loss of the radio frequency unit at higher frequencies and enhances the signal transmission and reception accuracy of the radio frequency unit.

[0131] Specifically, in this embodiment, the multiple transmitting units 6 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, thus ensuring the accuracy of detection.

[0132] Figure 18 This is a simulation diagram of the return loss in this embodiment. Figure 19 This is a simulation diagram of the radiation gain at different frequencies in this embodiment. As can be seen from the figure, in the 74GHz to 79GHz frequency band, the return loss of the RF unit is below -15dB. Meanwhile, 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 requirements for transmission and reception.

[0133] Figure 20This is a simulation diagram of radiation gain in different directions according to this embodiment. Taking angle θ (i.e., elevation angle) in the figure as an example, the gain of the main lobe can reach 18dB, and the width of main lobe I reaches 30 degrees. However, the gain of the adjacent first sidelobe II is only -4.5dB, resulting in a gain difference of more than 20dB between the two. This avoids interference from the sidelobe beam to the main lobe beam, preventing misjudgments by the radar components.

[0134] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principle of this utility model should be included within the protection scope of this utility model.

Claims

1. A radio frequency unit, characterized by The radio frequency unit includes: The first entity (31); and The second body (32) is coupled with the first body (31) to form a waveguide cavity (1). The inner wall of the waveguide cavity (1) is provided with a conductive layer. The waveguide cavity (1) includes an extension section (13), a first waveguide port (11) and a plurality of second waveguide ports (12). The extension section (13) extends from the first waveguide port (11) to the plurality of second waveguide ports (12). The extended section (13) includes multiple power dividers (2) in the extended direction, and each power divider (2) has a first connection terminal (21) and two second connection terminals (22). The multiple power dividers (2) are connected to form a multi-stage power divider group, and the second connection terminal (22) of the previous stage power divider (2) is connected to the first connection terminal (21) of the next stage power divider (2).

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. 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 a portion of the plurality of second waveguide ports (12).

3. The radio unit of claim 2, wherein, The plurality of second waveguide ports (12) are arranged at intervals; The first power divider (2a) and the second power divider (2b) are connected at their respective second connection ends (22) to form the confluence area (23), and the confluence area (23) is connected to the second waveguide port (12) in the middle region. The two second connection ends (22) of the first power divider (2a) and the second power divider (2b) are respectively connected to the second waveguide ports (12) in the two side regions.

4. The radio unit of claim 3, wherein, The plurality of power dividers (2) include a plurality of third power dividers (2c) arranged at intervals, the third power dividers (2c) being located one stage after the first power divider (2a), and the plurality of second connection terminals (22) of the plurality of third power dividers (2c) being respectively connected to the plurality of second waveguide ports (12).

5. The radio unit of claim 4, wherein, The first connection end (21) of the third power divider (2c) located in the middle region is connected to the confluence area (23), and the first connection end (21) of the third power divider (2c) located in the two side regions is connected to two second connection ends (22) of the first power divider (2a) and the second power divider (2b) on opposite sides.

6. The radio unit of claim 4, wherein, The first body (31) has a first groove (33) and the plurality of second waveguide ports (12), the second waveguide ports (12) passing through the first body (31) and connected to the first groove (33); The second body (32) has a second groove (34), and the first waveguide port (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 joined together to form the waveguide cavity (1).

7. The radio unit of claim 6, wherein, The second body (32) includes a plurality of first protrusions (35), which protrude from the bottom of the second groove (34) and are respectively corresponding to the plurality of second waveguide ports (12). The height of the first protrusion (35) is less than the depth of the second groove (34), and in the extension direction of the extension interval (13), the first protrusion (35) is far away from the first waveguide port (11).

8. The radio unit of claim 7, wherein, The second body (32) includes a second boss (38), which protrudes from the bottom of the first groove (33) and is correspondingly disposed to the first waveguide port (11). The height of the second boss (38) is less than the depth of the first groove (33), and in the extension direction of the extension interval (13), the second boss (38) is disposed away from the second waveguide port (12).

9. The radio unit of claim 5, wherein, The multi-stage power divider group is a three-stage power divider group, which 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 confluence area (23) is 54% of the transmission power of the first waveguide port (11).

10. The radio unit of claim 6, wherein, The first groove (33) includes a central groove (331) and a plurality of branch grooves (332). The plurality of branch grooves (332) extend from the central groove (331) toward the second waveguide port (12). A baffle (333) is provided in the middle of the central groove (331). The side of the baffle (333) is spaced apart from the side of the central groove (331), and the side of the baffle (333) forms part of the confluence area (23).

11. The radio unit of claim 9, wherein, The power divider (2) includes 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 terminals (22), and the other end is connected to one end of the first extension section (131). The other end of the first extension section (131) forms the first connection terminal (21). The two second extension segments (132) of the first power divider (2a) and the second power divider (2b) are connected to form the confluence area (23), and the cross-sectional area of ​​the second extension segment (132) away from the second waveguide port (12) is greater than the cross-sectional area of ​​the third extension segment (133) away from the second waveguide port (12).

12. The radio unit of claim 11, wherein, The second extension segment (132) and the third extension segment (133) of the third power divider (2c) located in the middle are mirror-symmetrical with respect to the first extension segment (131); The third power divider (2c) located on both sides, the two second extension segments (132) are located between the two third extension segments (133), and the cross-sectional area of ​​the second extension segment (132) away from the second waveguide port (12) is greater than the cross-sectional area of ​​the third extension segment (133) away from the second waveguide port (12).

13. The radio unit of any of claims 1-12, wherein, The radio frequency unit operates in the frequency band of 74 GHz to 79 GHz.

14. A radar assembly characterized by, The radar component includes: Multiple radio frequency units, each radio frequency unit includes a first body (31) and a second body (32), the second body (32) and the first body (31) are coupled to form a waveguide cavity (1), the waveguide cavity (1) includes an extension section (13), a first waveguide port (11) and multiple second waveguide ports (12), the extension section (13) extends from the first waveguide port (11) to the multiple second waveguide ports (12); The extended section (13) includes multiple power dividers (2) in the extended direction, and each power divider (2) has a first connection terminal (21) and two second connection terminals (22). The multiple power dividers (2) are connected to form a multi-stage power divider (2) group, and the second connection terminal (22) of the previous stage power divider (2) is connected to the first connection terminal (21) of the next stage power divider (2). 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. The second connection terminals (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 at least partially connected to one of the plurality of second waveguide ports (12).

15. The radar assembly of claim 14, wherein, 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). The first connecting plate (51) and the second connecting plate (52) are assembled together, and the first body (31) and the corresponding second body (32) are mated to form the waveguide cavity (1). The multiple radio frequency units include multiple transmitting units (6) and multiple receiving units (7). The first waveguide port (11) and the second waveguide port (12) of the multiple transmitting units (6) are respectively the inlet waveguide port and the outlet waveguide port. The first waveguide port (11) and the second waveguide port (12) of the multiple receiving units (7) are respectively the outlet waveguide port and the inlet waveguide port.

16. The radar assembly of claim 15, wherein, The number of the multiple transmitting units (6) is six and arranged horizontally at intervals. The multiple waveguide ports of each transmitting unit (6) are arranged vertically. The distance between two adjacent transmitting units (6) is 0.5λ×N, where λ is the operating wavelength of the transmitting unit (6) and N is a positive integer.

17. The radar assembly of claim 16, wherein, The detection range of the radar component is configured to be 250m.

18. The radar assembly of claim 16, wherein, The radar assembly also includes: The radio frequency circuit (8) includes a signal transmitting end and a signal receiving end; A waveguide conversion unit (9) is disposed between the second connecting plate (52) and the radio frequency circuit (8); The waveguide ports of the plurality of transmitting units (6) and the waveguide ports of the receiving units (7) are formed on the surface of the first connecting plate (51) opposite to the second connecting plate (52); The inlet waveguide ports of the plurality of transmitting units (6) and the outlet waveguide ports of the receiving units (7) are formed on the surface of the second connecting plate (52) opposite to the first connecting plate (51), and the inlet waveguide ports and the outlet waveguide ports are respectively connected to the signal transmitting end and the signal receiving end through the waveguide conversion part (9).

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