Millimeter wave waveguide layer-penetrating corner transmission device

Abstract

The invention discloses a millimeter wave waveguide layer-penetrating corner transmission device, which comprises a first rectangular waveguide and a second rectangular waveguide, and is characterized in that the first rectangular waveguide is arranged above the second rectangular waveguide, and a right angle is formed between the first rectangular waveguide and the second rectangular waveguide; the first rectangular waveguide and the second rectangular waveguide are internally provided with a first waveguide transmission cavity and a second waveguide transmission cavity respectively, the rear ends of the first waveguide transmission cavity and the second waveguide transmission cavity are closed, and a transmission gap communicated with the second waveguide transmission cavity is formed in the position, close to the rear end, of the bottom of the waveguide transmission cavity of the first rectangular waveguide. Electromagnetic waves propagated in the first rectangular waveguide are coupled to the second rectangular waveguide located on the lower layer through the transmission gap and propagated in the second waveguide transmission cavity, and the first rectangular waveguide and the second rectangular waveguide are combined together, so that the whole structure is few in parts, small in occupied space and capable of being flexibly arranged at the position with limited space.

Description

Technical Field

[0001] The present invention relates to the technical field of millimeter wave radars, and in particular to a millimeter wave waveguide layer-penetrating corner transmission device. Background Art

[0002] With the rapid development of ADAS technology, while its functions and performance are becoming more and more powerful, the performance requirements for the sensors used are also getting higher and higher. As a very important sensor in the ADAS system, millimeter-wave radar inevitably puts forward new and higher requirements for its performance. Microstrip lines are widely used in millimeter-wave radars due to their low cost, simple processing, and easy integration. However, microstrip lines have large losses and narrow bandwidths, which seriously affect the detection performance of millimeter-wave radars. Therefore, using waveguide antennas with low loss and large bandwidth to replace the original microstrip antennas naturally becomes an important direction for breakthroughs in the performance of 77GHz millimeter-wave radars. With the improvement of millimeter-wave radar performance, the number of millimeter-wave radar antennas is increasing, and the antenna layout is becoming more and more complex. When using waveguides to feed antennas, it is inevitable to perform corner and layer routing. However, because on the one hand, the waveguide is larger in size than the microstrip line, on the other hand, due to the limitation of the size of the millimeter-wave radar, the waveguide routing will be greatly affected, and there will even be interference problems. For example, when waveguide routing needs to pass through layers and turn corners, a through-layer transmission structure and a corner transmission structure are designed separately, and then the two structures are combined. This method can be conveniently used when there is sufficient space, but when space is limited, it is difficult to complete the routing using this method. Therefore, there is an urgent need for a through-layer corner transmission structure with a simple structure and a smaller size. Summary of the invention

[0003] The present invention provides a millimeter wave waveguide through-layer corner transmission device, which can solve the problem that the space structure occupies a large amount of space due to the need to design a through-layer transmission structure and a corner transmission structure respectively when the waveguide line is through-layer and cornered.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a millimeter wave waveguide layer-crossing corner transmission device, comprising a first rectangular waveguide and a second rectangular waveguide, wherein the first rectangular waveguide is arranged above the second rectangular waveguide, and the first rectangular waveguide and the second rectangular waveguide are arranged at a right angle, and the first rectangular waveguide and the second rectangular waveguide are respectively provided with a first waveguide transmission cavity and a second waveguide transmission cavity with a closed rear end, and a transmission gap connected to the second waveguide transmission cavity is provided at the bottom of the waveguide transmission cavity of the first rectangular waveguide near the rear end, and the electromagnetic wave propagating in the first rectangular waveguide is coupled to the second rectangular waveguide located in the lower layer through the transmission gap and propagates in the second waveguide transmission cavity, and the first rectangular waveguide and the second rectangular waveguide are combined together, and the two adopt a right-angle structure stacked up and down, and the bottom of the first rectangular waveguide and the upper part of the second rectangular waveguide are combined together, and the transmission gap is used to realize the upper and lower layer-crossing and 90° corner transmission of the electromagnetic wave in the waveguide, and the whole structure has few parts and occupies relatively little space, and can be flexibly arranged in a position with limited space.

[0005] Preferably, the cross-sections of the first waveguide transmission cavity and the second waveguide transmission cavity are both rectangular, and can have a relatively wide bandwidth and a relatively small loss.

[0006] Preferably, the transmission slot is arranged between the first rear end side wall and the first right side wall inside the first rectangular waveguide, the right inner side wall of the transmission slot is in the same plane as the inner side surface of the first right side wall of the first rectangular waveguide, the rear inner wall of the transmission slot is in the same plane as the inner side surface of the first rear end side wall of the first rectangular waveguide and the inner side surface of the second right side wall of the second rectangular waveguide, the transmission slot is arranged at a position flush with the first right side wall so that it can pass through the layer to the second rectangular waveguide in a relatively short distance during transmission, the rear inner wall of the transmission slot is flush with the second right side wall and the first rear end side wall, which can reduce the obstruction of the internal structure to electromagnetic waves and improve the transmission efficiency.

[0007] Preferably, the width of the transmission gap is smaller than the width of the first waveguide transmission cavity, and the length of the transmission gap is smaller than the width of the second waveguide transmission cavity, so as to ensure that the area of ​​the transmission gap can be fully utilized, and the length and width of the transmission gap can meet the coupling requirements and impedance matching requirements of the first waveguide transmission cavity to the second waveguide transmission cavity.

[0008] Preferably, a first rectangular step is arranged between the first rear end side wall and the left side wall of the first rectangular waveguide, and the first rectangular step mainly plays a role in impedance matching when the electromagnetic wave is transmitted from the first waveguide transmission cavity to the second waveguide transmission cavity through the transmission gap.

[0009] Preferably, the height of the first rectangular step is the same as the height of the first waveguide transmission cavity, the width of the first rectangular step is smaller than the width of the first rectangular waveguide, and the right end face of the first rectangular step maintains a distance from the left inner wall of the transmission slot. The distance between the first rectangular step and the transmission slot is actually related to the width of the first rectangular step, because for a specific rectangular waveguide, the waveguide width is fixed. When the width of the first rectangular step and the size of the transmission slot are appropriately set, better impedance matching between the first waveguide transmission cavity and the transmission slot can be ensured, thereby achieving transmission of electromagnetic waves with less loss.

[0010] Preferably, the rear end face of the first rectangular step and the inner side face of the first rear end side wall of the first rectangular waveguide are in the same plane, and the left end face of the first rectangular step and the inner side face of the left side wall of the first rectangular waveguide are in the same plane.

[0011] Preferably, a second rectangular step is arranged inside the second rectangular waveguide near the second rear end side wall, the height of the second rectangular step is the same as the height of the second waveguide transmission cavity, and the right end face of the second rectangular step maintains a distance from the left inner wall of the transmission gap.

[0012] Preferably, a first rectangular ridge is centrally arranged on the inner bottom surface of the first waveguide transmission cavity, and a second rectangular ridge is centrally arranged on the inner bottom surface of the second waveguide transmission cavity. The first rectangular ridge and the second rectangular ridge can meet the needs of different forms of high-frequency signal transmission, and the first rectangular ridge and the second rectangular ridge can be feeding ridges or waveguide ridges.

[0013] Preferably, a distance is maintained between the end of the first rectangular ridge and the front inner wall of the transmission gap, and a distance is maintained between the end of the second rectangular ridge and the right inner wall of the transmission gap.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] By combining the first rectangular waveguide and the second rectangular waveguide into a right-angle structure stacked up and down, the bottom of the first rectangular waveguide and the upper part of the second rectangular waveguide are combined together, and the transmission gap is used to realize the upper and lower layer penetration and 90° angle transmission of electromagnetic waves in the waveguide, which occupies relatively little space and can be flexibly arranged in a position with limited space; the first waveguide transmission cavity and the second waveguide transmission cavity adopt a rectangular structure with a wider bandwidth and less loss. The entire structure has fewer parts and components, which can effectively reduce the complexity and production difficulty of the mold, thereby reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a schematic structural diagram of a millimeter wave waveguide layer-through corner transmission device according to a first embodiment of the present invention;

[0017] Figure 2 A perspective view of a millimeter wave guide layer-through corner transmission device according to a first embodiment of the present invention;

[0018] Figure 3 A top view of a millimeter wave guide layer-through corner transmission device according to a first embodiment of the present invention;

[0019] Figure 4 A top view of a first rectangular waveguide of a millimeter-wave waveguide layer-through corner transmission device according to a first embodiment of the present invention;

[0020] Figure 5 It is a top view of the second rectangular waveguide of the millimeter waveguide layer-through corner transmission device according to the first embodiment of the present invention;

[0021] Figure 6 This is a schematic structural diagram of a millimeter wave guide layer-through corner transmission device according to a second embodiment of the present invention;

[0022] Figure 7 A top view of a millimeter wave guide layer-through corner transmission device according to a second embodiment of the present invention;

[0023] Figure 8 A top view of a first rectangular waveguide of a millimeter-wave waveguide layer-through corner transmission device according to a second embodiment of the present invention;

[0024] Fig. 9 A top view of a second rectangular waveguide of a millimeter-wave waveguide layer-through corner transmission device according to a second embodiment of the present invention;

[0025] Fig.10 FIG. 1 is an S parameter curve diagram of the millimeter wave guide layer-through corner transmission device according to the first embodiment of the present invention.

[0026] Reference numerals:

[0027] 1. first rectangular waveguide, 11. first rear end side wall, 12. first right side wall, 13. left side wall, 14. transmission gap, 141. right inner wall, 142. rear inner wall, 143. front inner wall, 15. first rectangular step, 151. rear end face, 152. left end face, 16. first waveguide transmission cavity, 17. second waveguide transmission cavity, 18. first rectangular ridge, 2. second rectangular waveguide, 21. second rear end side wall, 22. second rectangular step, 23. second right side wall, 24. second rectangular ridge. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] The present invention aims to solve the problem that the space occupied by the waveguide structure is relatively large due to the need to design a layer-through transmission structure and a corner transmission structure respectively when the waveguide is passing through layers and turning corners. Figure 1-9 As shown, the following technical solution is provided: a millimeter-wave waveguide layer-through corner transmission device, comprising a first rectangular waveguide 1 and a second rectangular waveguide 2, wherein the first rectangular waveguide 1 is arranged above the second rectangular waveguide 2, and the first rectangular waveguide 1 and the second rectangular waveguide 2 are arranged at a right angle, and a first waveguide transmission cavity 16 and a second waveguide transmission cavity 17 with a closed rear end are respectively arranged in the first rectangular waveguide 1 and the second rectangular waveguide 2, and a transmission gap 14 connected to the second waveguide transmission cavity 17 is arranged at the bottom of the waveguide transmission cavity 16 of the first rectangular waveguide 1 near the rear end, and the electromagnetic wave propagating in the first rectangular waveguide 1 is coupled to the second rectangular waveguide 2 located in the lower layer through the transmission gap 14 and propagates in the second waveguide transmission cavity 17.

[0030] In a preferred embodiment, the cross-sections of the first waveguide transmission cavity 16 and the second waveguide transmission cavity 17 are both rectangular.

[0031] In a preferred embodiment, the transmission slot 14 is arranged between the first rear end side wall 11 and the first right side wall 12 inside the first rectangular waveguide 1, the right inner side wall 141 of the transmission slot 14 and the inner side surface of the first right side wall 12 of the first rectangular waveguide 1 are in the same plane, and the rear inner wall 142 of the transmission slot 14 and the inner side surface of the first rear end side wall 11 of the first rectangular waveguide 1 and the inner side surface of the second right side wall 23 of the second rectangular waveguide 2 are in the same plane.

[0032] In a preferred embodiment, the width of the transmission slot 14 is smaller than the width of the first waveguide transmission cavity 16, and the length of the transmission slot 14 is smaller than the width of the second waveguide transmission cavity 17, so as to ensure that the area of ​​the transmission slot 14 can be fully utilized.

[0033] In a preferred embodiment, a first rectangular step 15 is disposed between the first rear end side wall 11 and the left side wall 13 of the first rectangular waveguide 1 .

[0034] In a preferred embodiment, the height of the first rectangular step 15 is the same as the height of the first waveguide transmission cavity 16, the width of the first rectangular step 15 is smaller than the width of the first rectangular waveguide 1, and the right end face of the first rectangular step 15 maintains a distance from the left inner wall of the transmission slot 14.

[0035] In a preferred embodiment, the rear end face 151 of the first rectangular step 15 and the inner side face of the first rear end side wall 11 of the first rectangular waveguide 1 are in the same plane, and the left end face 152 of the first rectangular step 15 and the inner side face of the left side wall 13 of the first rectangular waveguide 1 are in the same plane.

[0036] In a preferred embodiment, a second rectangular step 22 is provided inside the second rectangular waveguide 2 near the second rear end side wall 21, the height of the second rectangular step 22 is the same as the height of the second waveguide transmission cavity 17, and the right end face of the second rectangular step 22 maintains a distance from the left inner wall of the transmission gap 14.

[0037] In a preferred embodiment, a first rectangular ridge 18 is centrally arranged on the inner bottom surface of the first waveguide transmission cavity 16, and a second rectangular ridge 24 is centrally arranged on the inner bottom surface of the second waveguide transmission cavity 17. The first rectangular ridge 18 and the second rectangular ridge 24 can meet the needs of different forms of high-frequency signal transmission. The first rectangular ridge 18 and the second rectangular ridge 24 can be feeding ridges or waveguide ridges.

[0038] In a preferred embodiment, a distance is maintained between the end of the first rectangular ridge 18 and the front inner wall 143 of the transmission slot 14, and a distance is maintained between the end of the second rectangular ridge 24 and the right inner wall 141 of the transmission slot 14, wherein the first rectangular ridge 18 and the second rectangular ridge 24 are kept at a suitable distance from the transmission slot 14 in order to ensure impedance matching design for electromagnetic waves to be transmitted through the transmission slot 14 with less reflection between the first waveguide transmission cavity 16 and the second waveguide transmission cavity 17.

[0039] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation and protection scope of the present invention.

[0040] The present invention also has the following implementation modes based on the above:

[0041] In a further embodiment of the present invention, specific implementation mode 1 includes the following contents:

[0042] In order to solve the technical problem, the through-layer corner transmission device is mainly composed of a first rectangular waveguide 1 and a second rectangular waveguide 2, wherein the first rectangular waveguide 1 is arranged above the second rectangular waveguide 2, and the first rectangular waveguide 1 and the second rectangular waveguide 2 are arranged at a right angle, and the first rectangular waveguide 1 and the second rectangular waveguide 2 are respectively provided with a first waveguide transmission cavity 16 and a second waveguide transmission cavity 17 with closed rear ends, wherein the inner side walls of the first waveguide transmission cavity 16 and the second waveguide transmission cavity 17 are both made of metal materials, the first rectangular waveguide 1 and the second rectangular waveguide 2 can be made of metal materials as a whole, or a metal layer can be provided on the inner side walls of the first waveguide transmission cavity 16 and the second waveguide transmission cavity 17, and the inner side walls of the first waveguide transmission cavity 16 and the second waveguide transmission cavity 17 have smooth metal surfaces, which can reduce the loss of electromagnetic wave transmission. Among them, the cross-sections of the first waveguide transmission cavity 16 and the second waveguide transmission cavity 17 are both rectangular, and the rectangular transmission cavity can have a relatively wide bandwidth and a small loss.

[0043] In order to save space, the first rectangular waveguide 1 and the second rectangular waveguide 2 are combined together, and the two adopt a right-angle structure stacked up and down. The bottom of the first rectangular waveguide 1 and the upper part of the second rectangular waveguide 2 are combined together, and the transmission gap 14 is used to realize the up and down layer penetration and 90° corner transmission of electromagnetic waves in the waveguide. The entire transmission device can be repeatedly arranged in a limited space as a unit to realize multiple up and down layer penetration and 90° corner transmission. The length of the first rectangular waveguide 1 and the second rectangular waveguide 2 can be extended as needed. When multiple transmission devices are combined, a second rectangular waveguide 2 can also be arranged on the lower side of the front end of the second rectangular waveguide 2. The continuous arrangement of the first rectangular waveguide 1 and the second rectangular waveguide 2 can realize multiple layer penetration from top to bottom and perform 90° corner transmission while penetrating the layers.

[0044] The first rectangular waveguide 1 and the second rectangular waveguide 2 can be formed in one piece using a mold, or they can be formed separately and then assembled. During assembly, the gap between the first rectangular waveguide 1 and the second rectangular waveguide 2 needs to be minimized to reduce electromagnetic wave leakage losses.

[0045] In order to realize the electromagnetic wave penetration between the first waveguide transmission cavity 16 and the second waveguide transmission cavity 17, a transmission gap 14 connected to the second waveguide transmission cavity 17 is provided at the bottom of the waveguide transmission cavity 16 of the first rectangular waveguide 1 near the rear end. The electromagnetic wave propagating in the first rectangular waveguide 1 is coupled to the second rectangular waveguide 2 located in the lower layer through the transmission gap 14 and propagates in the second waveguide transmission cavity 17.

[0046] Among them, the transmission slot 14 is arranged at a position between the first rear end side wall 11 and the first right side wall 12 inside the first rectangular waveguide 1, the right inner side wall 141 of the transmission slot 14 and the inner side surface of the first right side wall 12 of the first rectangular waveguide 1 are in the same plane, the rear inner wall 142 of the transmission slot 14 and the inner side surface of the first rear end side wall 11 of the first rectangular waveguide 1 and the inner side surface of the second right side wall 23 of the second rectangular waveguide 2 are in the same plane, and the transmission slot 14 is arranged at a position flush with the first right side wall 12 so that it can pass through the layer to the second rectangular waveguide 2 in a relatively short distance during transmission, and the rear inner wall 142 of the transmission slot 14 is flush with the second right side wall 23 and the first rear end side wall 11, which can reduce the obstruction of the internal structure to electromagnetic waves and improve the transmission efficiency.

[0047] The width of the transmission slot 14 is smaller than the width of the first waveguide transmission cavity 16, and the length of the transmission slot 14 is smaller than the width of the second waveguide transmission cavity 17, so as to ensure that the area of ​​the transmission slot 14 can be fully utilized, and the length and width of the transmission slot 14 can meet the coupling requirements and impedance matching requirements of the first waveguide transmission cavity 16 transmitting the second waveguide transmission cavity 17, and on the other hand, to reduce the size of the transmission structure.

[0048] A first rectangular step 15 is provided between the first rear end side wall 11 and the left side wall 13 of the first rectangular waveguide 1. The first rectangular step 15 mainly plays a role in impedance matching when the electromagnetic wave is transmitted from the first waveguide transmission cavity 16 to the second waveguide transmission cavity 17 through the transmission gap 14.

[0049] Among them, the height of the first rectangular step 15 is the same as the height of the first waveguide transmission cavity 16, the width of the first rectangular step 15 is smaller than the width of the first rectangular waveguide 1, and the right end face of the first rectangular step 15 maintains a distance from the left inner wall of the transmission slot 14. The distance between the first rectangular step 15 and the transmission slot 14 is actually related to the width of the first rectangular step, because for a specific rectangular waveguide, the waveguide width is fixed. When the width of the first rectangular step 15 and the size of the transmission slot 14 are set appropriately, it can ensure that the first waveguide transmission cavity 16 and the transmission slot 14 have better impedance matching, thereby achieving electromagnetic wave transmission with less loss.

[0050] The rear end face 151 of the first rectangular step 15 and the inner side face of the first rear end side wall 11 of the first rectangular waveguide 1 are in the same plane, and the left end face 152 of the first rectangular step 15 and the inner side face of the left side wall 13 of the first rectangular waveguide 1 are in the same plane.

[0051] A second rectangular step 22 is provided inside the second rectangular waveguide 2 near the second rear end side wall 21 , and the height of the second rectangular step 22 is the same as the height of the second waveguide transmission cavity 17 , and the right end face of the second rectangular step 22 maintains a distance from the left inner wall of the transmission gap 14 .

[0052] Specifically, after the electromagnetic wave is transmitted to the second waveguide transmission cavity 17 through the transmission gap 14, a part of the electromagnetic wave propagates along the propagation direction of the second waveguide transmission cavity 17, and the other part propagates toward the end of the second waveguide transmission cavity 17. In order to make the electromagnetic wave propagate along the propagation direction of the second waveguide transmission cavity 17 with less loss, it is necessary to reasonably set the second rectangular step 22 at the end, so that the electromagnetic wave transmitted to the end of the second waveguide transmission cavity 17 and the reflected wave reflected by the second rectangular step 22 will produce a 180-degree phase shift at the transmission gap 14, and the reflected wave and the incident wave transmitted to the end of the second waveguide transmission cavity 17 are exactly offset, which is equivalent to no electromagnetic wave being transmitted to the end of the second waveguide transmission cavity 17, and the electromagnetic wave only propagates along the propagation direction of the second waveguide transmission cavity 17.

[0053] Fig.10 It is the S parameter curve of the through-layer corner transmission device designed according to the present embodiment. From the figure, it can be seen that the insertion loss (S21) of the through-layer corner transmission device is less than 0.2dB in the frequency band of 74.985GHz to 84.719GHz. Therefore, the electromagnetic wave loss of the transmission device in the present embodiment is relatively small, and there is no need to separately set up a through-layer transmission device and a corner transmission device.

[0054] In a further embodiment of the present invention, the second specific implementation mode includes the following contents:

[0055] Compared with the above-mentioned specific embodiment 1, the main difference of specific embodiment 2 is that a first rectangular ridge 18 is centrally arranged on the inner bottom surface of the first waveguide transmission cavity 16, and a second rectangular ridge 24 can also be centrally arranged on the inner bottom surface of the second waveguide transmission cavity 17. The first rectangular ridge 18 and the second rectangular ridge 24 can meet the needs of different forms of high-frequency signal transmission, and the first rectangular ridge 18 and the second rectangular ridge 24 can be feeding ridges or waveguide ridges.

[0056] There is a distance between the end of the first rectangular ridge 18 and the front inner wall 143 of the transmission gap 14 , and there is a distance between the end of the second rectangular ridge 24 and the right inner wall 141 of the transmission gap 14 .

[0057] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0058] In addition, in the present invention, descriptions such as "primary", "secondary", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "primary" or "secondary" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection 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.

[0060] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A millimeter wave waveguide layer-through corner transmission device, characterized in that: include: A first rectangular waveguide (1) and a second rectangular waveguide (2), wherein the first rectangular waveguide (1) is arranged above the second rectangular waveguide (2), and the first rectangular waveguide (1) and the second rectangular waveguide (2) are arranged at a right angle, and a first waveguide transmission cavity (16) and a second waveguide transmission cavity (17) with closed rear ends are respectively arranged in the first rectangular waveguide (1) and the second rectangular waveguide (2), and a transmission gap (14) connected to the second waveguide transmission cavity (17) is arranged at the bottom of the waveguide transmission cavity (16) of the first rectangular waveguide (1) near the rear end, and the electromagnetic wave propagating in the first rectangular waveguide (1) is coupled to the second rectangular waveguide (2) located in the lower layer through the transmission gap (14) and propagates in the second waveguide transmission cavity (17).

2. The millimeter wave waveguide layer-through corner transmission device according to claim 1, characterized in that: The cross sections of the first waveguide transmission cavity (16) and the second waveguide transmission cavity (17) are both rectangular.

3. The millimeter wave waveguide layer-through corner transmission device according to claim 1, characterized in that: The transmission slot (14) is arranged between the first rear end side wall (11) and the first right side wall (12) inside the first rectangular waveguide (1); the right inner side wall (141) of the transmission slot (14) and the inner side surface of the first right side wall (12) of the first rectangular waveguide (1) are in the same plane; the rear inner side wall (142) of the transmission slot (14) and the inner side surface of the first rear end side wall (11) of the first rectangular waveguide (1) and the inner side surface of the second right side wall (23) of the second rectangular waveguide (2) are in the same plane.

4. The millimeter wave waveguide layer-through corner transmission device according to claim 3, characterized in that: The width of the transmission gap (14) is smaller than the width of the first waveguide transmission cavity (16), and the length of the transmission gap (14) is smaller than the width of the second waveguide transmission cavity (17).

5. The millimeter wave waveguide layer-through corner transmission device according to claim 3, characterized in that: A first rectangular step (15) is provided between the first rear end side wall (11) and the left side wall (13) of the first rectangular waveguide (1).

6. The millimeter wave waveguide layer-through corner transmission device according to claim 5, characterized in that: The height of the first rectangular step (15) is the same as the height of the first waveguide transmission cavity (16), the width of the first rectangular step (15) is smaller than the width of the first rectangular waveguide (1), and the right end face of the first rectangular step (15) maintains a distance from the left inner wall of the transmission gap (14).

7. The millimeter wave waveguide layer-through corner transmission device according to claim 6, characterized in that: The rear end surface (151) of the first rectangular step (15) and the inner surface of the first rear end side wall (11) of the first rectangular waveguide (1) are in the same plane, and the left end surface (152) of the first rectangular step (15) and the inner surface of the left side wall (13) of the first rectangular waveguide (1) are in the same plane.

8. The millimeter wave waveguide layer-through corner transmission device according to claim 1, characterized in that: A second rectangular step (22) is provided inside the second rectangular waveguide (2) near the second rear end side wall (21); the height of the second rectangular step (22) is the same as the height of the second waveguide transmission cavity (17); and the right end face of the second rectangular step (22) maintains a distance from the left inner wall of the transmission gap (14).

9. The millimeter wave waveguide layer-through corner transmission device according to claim 3, characterized in that: A first rectangular ridge (18) is centrally arranged on the inner bottom surface of the first waveguide transmission cavity (16), and a second rectangular ridge (24) is centrally arranged on the inner bottom surface of the second waveguide transmission cavity (17).

10. The millimeter wave waveguide layer-through corner transmission device according to claim 9, characterized in that: A distance is maintained between the end of the first rectangular ridge (18) and the front inner wall (143) of the transmission gap (14), and a distance is maintained between the end of the second rectangular ridge (24) and the right inner wall (141) of the transmission gap (14).

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