Millimeter wave waveguide layer-penetrating corner transmission device

Abstract

The utility model discloses a millimeter wave waveguide layer-penetrating corner transmission device which comprises a first rectangular waveguide and a second rectangular waveguide, 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] This utility model relates to the field of millimeter-wave radar technology, specifically to a millimeter-wave waveguide through-layer corner transmission device. Background Technology

[0002] With the rapid development of ADAS technology, as its functions and performance become increasingly powerful, the performance requirements for the sensors used are also becoming higher. As a very important sensor in ADAS systems, millimeter-wave radar inevitably faces new and higher performance requirements. Microstrip lines are widely used in millimeter-wave radar due to their advantages such as low cost, simple processing, and easy integration. However, microstrip lines have high losses and narrow bandwidth, which seriously affects the detection performance of millimeter-wave radar. Therefore, replacing the original microstrip antenna with waveguide antennas with low loss and high bandwidth has naturally become an important direction for the performance breakthrough of 77GHz millimeter-wave radar. With the improvement of millimeter-wave radar performance, the number of antennas of millimeter-wave radar is also increasing, and the antenna layout is becoming more and more complex. When using waveguides to feed antennas, corners and through-layer routing are unavoidable. However, because waveguides are larger in size than microstrip lines, and because of the size limitations of millimeter-wave radar, waveguide routing is greatly affected, and even interference problems may occur. Currently, when waveguide traces need to pass through layers and turn corners, separate transmission structures are designed for layer-passing and corner-turning, and then the two structures are combined. This method is convenient when space is sufficient, but it is difficult to complete the traces when space is limited. Therefore, there is an urgent need for a simple and small-sized transmission structure for layer-passing and corner-turning. Utility Model Content

[0003] This invention provides a millimeter-wave waveguide through-layer and corner transmission device, which can solve the problem of large space occupation caused by the need to design separate through-layer and corner transmission structures for waveguide routing when it is through layers and at corners.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a millimeter-wave waveguide layer-penetrating corner transmission device, comprising a first rectangular waveguide and a second rectangular waveguide, wherein the first rectangular waveguide is disposed above the second rectangular waveguide and the first and second rectangular waveguides are arranged at right angles. The first and second rectangular waveguides are respectively provided with a first waveguide transmission cavity and a second waveguide transmission cavity closed at the rear end. A transmission slot communicating with the second waveguide transmission cavity is provided at the bottom of the first rectangular waveguide's waveguide transmission cavity near the rear end. Electromagnetic waves propagating in the first rectangular waveguide are coupled to the lower-layer second rectangular waveguide through the transmission slot and propagate in the second waveguide transmission cavity. By combining the first and second rectangular waveguides together in a right-angled stacked structure, the bottom of the first rectangular waveguide and the top of the second rectangular waveguide are combined. The transmission slot enables electromagnetic waves to penetrate layers vertically and achieve 90° corner transmission within the waveguides. The entire structure has few components, occupies relatively little space, and can be flexibly arranged in space-constrained locations.

[0005] Preferably, both the first and second waveguide transmission cavities have rectangular cross-sections, which can provide a relatively wide bandwidth and low loss.

[0006] Preferably, the transmission slot is located between the first rear end sidewall and the first right sidewall inside the first rectangular waveguide. The inner right sidewall of the transmission slot is in the same plane as the inner surface of the first right sidewall of the first rectangular waveguide. The inner rear sidewall of the transmission slot is in the same plane as the inner surface of the first rear end sidewall of the first rectangular waveguide and the inner surface of the second right sidewall of the second rectangular waveguide. The transmission slot is located at a position flush with the first right sidewall, which allows it to pass through layers into the second rectangular waveguide with a relatively short path during transmission. The fact that the inner rear sidewall of the transmission slot is flush with both the second right sidewall and the first rear end sidewall reduces the obstruction of electromagnetic waves by the internal structure and improves transmission efficiency.

[0007] Preferably, the width of the transmission slot is smaller than the width of the first waveguide transmission cavity, and the length of the transmission slot is smaller than the width of the second waveguide transmission cavity, so as to ensure that the area of ​​the transmission slot can be fully utilized, and the length and width of the transmission slot 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 provided between the first rear end sidewall and the left sidewall of the first rectangular waveguide. The main function of the first rectangular step is to play an impedance matching role when electromagnetic waves are 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 less 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, its waveguide width is fixed. When the width of the first rectangular step and the size of the transmission slot are set appropriately, it can ensure that a good impedance match is achieved between the first waveguide transmission cavity and the transmission slot, thereby achieving transmission with less electromagnetic wave loss.

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

[0011] Preferably, a second rectangular step is provided inside the second rectangular waveguide near the second rear end sidewall. 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 certain distance from the left inner wall of the transmission slot.

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

[0013] Preferably, the end of the first rectangular ridge is kept at a distance from the front inner wall of the transmission slit, and the end of the second rectangular ridge is kept at a distance from the right inner wall of the transmission slit.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] By combining the first and second rectangular waveguides into a right-angled stacked structure, and combining the bottom of the first and the top of the second rectangular waveguides, electromagnetic waves can be transmitted vertically and horizontally and at 90° angles within the waveguides using transmission gaps. This method requires less space and can be flexibly deployed in space-constrained locations. The rectangular structure of the first and second waveguide transmission cavities results in a wider bandwidth and lower loss. The overall structure has fewer components, which effectively reduces the complexity of the mold and the difficulty of production, thereby reducing production costs. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the structure of the millimeter-wave waveguide through-layer corner transmission device according to Embodiment 1 of this utility model;

[0017] Figure 2 This is a perspective view of the millimeter-wave waveguide through-layer corner transmission device according to Embodiment 1 of this utility model;

[0018] Figure 3 This is a top view of the millimeter-wave waveguide through-layer corner transmission device according to Embodiment 1 of this utility model;

[0019] Figure 4 This is a top view of the first rectangular waveguide of the millimeter-wave waveguide through-layer corner transmission device according to Embodiment 1 of this utility model;

[0020] Figure 5 This is a top view of the second rectangular waveguide of the millimeter-wave waveguide through-layer corner transmission device according to Embodiment 1 of this utility model;

[0021] Figure 6 This is a schematic diagram of the millimeter-wave waveguide through-layer corner transmission device according to Embodiment 2 of this utility model;

[0022] Figure 7 This is a top view of the millimeter-wave waveguide through-layer corner transmission device according to Embodiment 2 of this utility model;

[0023] Figure 8 This is a top view of the first rectangular waveguide of the millimeter-wave waveguide through-layer corner transmission device according to Embodiment 2 of this utility model;

[0024] Figure 9 This is a top view of the second rectangular waveguide of the millimeter-wave waveguide through-layer corner transmission device according to Embodiment 2 of this utility model;

[0025] Figure 10 This is a graph showing the S-parameters of the millimeter-wave waveguide through-layer corner transmission device according to Embodiment 1 of this utility model.

[0026] Figure label:

[0027] 1. First rectangular waveguide; 11. First rear end sidewall; 12. First right sidewall; 13. Left sidewall; 14. Transmission slot; 141. Right inner sidewall; 142. Rear inner sidewall; 143. Front inner sidewall; 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 sidewall; 22. Second rectangular step; 23. Second right sidewall; 24. Second rectangular ridge. Detailed Implementation

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

[0029] This invention addresses the problem of large space occupation caused by the need for separate layer-penetration and corner-turn transmission structures when waveguide traces pass through layers and turn corners. For example... Figure 1-9 As shown, the following technical solution is provided: a millimeter-wave waveguide through-layer corner transmission device, including a first rectangular waveguide 1 and a second rectangular waveguide 2, wherein the first rectangular waveguide 1 is disposed above the second rectangular waveguide 2, and the first rectangular waveguide 1 and the second rectangular waveguide 2 are arranged at a right angle. 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. The bottom of the waveguide transmission cavity 16 of the first rectangular waveguide 1 is provided with a transmission gap 14 that communicates with the second waveguide transmission cavity 17. Electromagnetic waves propagating in the first rectangular waveguide 1 are coupled to the second rectangular waveguide 2 located in the lower layer through the transmission gap 14 and propagate 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 located between the first rear end sidewall 11 and the first right sidewall 12 inside the first rectangular waveguide 1. The right inner sidewall 141 of the transmission slot 14 is in the same plane as the inner surface of the first right sidewall 12 of the first rectangular waveguide 1. The rear inner sidewall 142 of the transmission slot 14 is in the same plane as the inner surface of the first rear end sidewall 11 of the first rectangular waveguide 1 and the inner surface of the second right sidewall 23 of the second rectangular waveguide 2.

[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, ensuring that the area of ​​the transmission slot 14 can be fully utilized.

[0033] In a preferred embodiment, a first rectangular step 15 is provided between the first rear end sidewall 11 and the left sidewall 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 less 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.

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

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

[0037] In a preferred embodiment, a first rectangular ridge 18 is centrally disposed on the inner bottom surface of the first waveguide transmission cavity 16, and a second rectangular ridge 24 is centrally disposed 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 a feed ridge or a waveguide ridge.

[0038] In a preferred embodiment, the end of the first rectangular ridge 18 is kept at a distance from the front inner wall 143 of the transmission slot 14, and the end of the second rectangular ridge 24 is kept at a distance from the right inner wall 141 of the transmission slot 14. The appropriate distance between the first rectangular ridge 18 and the second rectangular ridge 24 and the transmission slot 14 is an impedance matching design to ensure that the electromagnetic wave is transmitted with minimal reflection between the first waveguide transmission cavity 16 and the second waveguide transmission cavity 17 through the transmission slot 14.

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

[0040] Based on the above, this utility model also has the following embodiments:

[0041] In a further embodiment of this utility model, specific implementation method one includes the following:

[0042] The through-layer corner transmission device designed to solve technical problems mainly includes a first rectangular waveguide 1 and a second rectangular waveguide 2. The first rectangular waveguide 1 is positioned above the second rectangular waveguide 2, and the first and second rectangular waveguides are arranged at a right angle. The first and second rectangular waveguides 1 and 2 respectively contain a first waveguide transmission cavity 16 and a second waveguide transmission cavity 17, both with closed rear ends. The inner walls of both the first and second waveguide transmission cavities 16 and 17 are made of metal. The first and second rectangular waveguides 1 and 2 can be entirely made of metal, or a metal layer can be provided on the inner walls of the first and second waveguide transmission cavities 16 and 17. The inner walls of the first and second waveguide transmission cavities 16 and 17 have smooth metal surfaces, which can reduce electromagnetic wave transmission loss. The cross-sections of both the first and second waveguide transmission cavities 16 and 17 are rectangular, which allows for a wider bandwidth and lower loss.

[0043] To save space, the first rectangular waveguide 1 and the second rectangular waveguide 2 are combined together in a right-angled stacked structure. The bottom of the first rectangular waveguide 1 and the top of the second rectangular waveguide 2 are combined together. The transmission gap 14 enables electromagnetic waves to pass through layers and rotate 90° in the waveguide. The entire transmission device can be set up repeatedly as a unit in a limited space to achieve multiple layers and rotations. The lengths of the first rectangular waveguide 1 and the second rectangular waveguide 2 can be extended as needed. When multiple transmission devices are combined, another second rectangular waveguide 2 can be set on the lower front side of the second rectangular waveguide 2. The continuous arrangement of the first rectangular waveguide 1 and the second rectangular waveguide 2 can achieve multiple layers from top to bottom and perform 90° rotation transmission while passing through layers.

[0044] The first rectangular waveguide 1 and the second rectangular waveguide 2 can be integrally molded, or they can be molded separately and then assembled. During assembly, the gap between the first rectangular waveguide 1 and the second rectangular waveguide 2 should be minimized as much as possible to reduce electromagnetic wave leakage loss.

[0045] In order to enable electromagnetic waves to pass through the layers between the first waveguide transmission cavity 16 and the second waveguide transmission cavity 17, a transmission slot 14 is provided at the bottom of the waveguide transmission cavity 16 of the first rectangular waveguide 1 near the rear end, which is connected to the second waveguide transmission cavity 17. The electromagnetic waves propagating in the first rectangular waveguide 1 are coupled to the second rectangular waveguide 2 located below through the transmission slot 14 and propagate in the second waveguide transmission cavity 17.

[0046] The transmission slot 14 is located between the first rear end sidewall 11 and the first right sidewall 12 inside the first rectangular waveguide 1. The right inner sidewall 141 of the transmission slot 14 is in the same plane as the inner surface of the first right sidewall 12 of the first rectangular waveguide 1. The rear inner sidewall 142 of the transmission slot 14 is in the same plane as the inner surface of the first rear end sidewall 11 of the first rectangular waveguide 1 and the inner surface of the second right sidewall 23 of the second rectangular waveguide 2. The transmission slot 14 is located at a position flush with the first right sidewall 12, which allows it to pass through the layers into the second rectangular waveguide 2 with a relatively short path during transmission. The fact that the rear inner sidewall 142 of the transmission slot 14 is flush with the second right sidewall 23 and the first rear end sidewall 11 can reduce the obstruction of electromagnetic waves by the internal structure 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. This ensures that the area of ​​the transmission slot 14 can be fully utilized. Moreover, 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 to transmit to the second waveguide transmission cavity 17. On the other hand, it is also to reduce the size of the transmission structure.

[0048] A first rectangular step 15 is provided between the first rear end sidewall 11 and the left sidewall 13 of the first rectangular waveguide 1. The main function of the first rectangular step 15 is to play an impedance matching role when electromagnetic waves are transmitted from the first waveguide transmission cavity 16 through the transmission gap 14 to the second waveguide transmission cavity 17.

[0049] 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, its 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 achieve good impedance matching, thereby achieving transmission with less electromagnetic wave loss.

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

[0051] The second rectangular waveguide 2 has a second rectangular step 22 located inside the second rear end sidewall 21. The height of the second rectangular step 22 is the same as the height of the second waveguide transmission cavity 17. The right end face of the second rectangular step 22 is at a distance from the left inner wall of the transmission gap 14.

[0052] Specifically, when the electromagnetic wave is transmitted to the second waveguide transmission cavity 17 through the transmission gap 14, part of the electromagnetic wave propagates along the propagation direction of the second waveguide transmission cavity 17, and the other part propagates towards 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, a second rectangular step 22 needs to be reasonably set at the end. This will cause the reflected wave of the electromagnetic wave transmitted to the end of the second waveguide transmission cavity 17 to be reflected by the second rectangular step 22, which will generate a 180° phase shift at the transmission gap 14. This reflected wave will just cancel out the transmitted wave transmitted to the end of the second waveguide transmission cavity 17, which is equivalent to no electromagnetic wave being transmitted to the end of the second waveguide transmission cavity 17. The electromagnetic wave only propagates along the propagation direction of the second waveguide transmission cavity 17.

[0053] Figure 10 The figure shows the S-parameter curve of the cross-layer corner transmission device designed according to this embodiment. As can be seen from the figure, the insertion loss (S21) of the cross-layer corner transmission device is less than 0.2dB in the frequency band range of 74.985GHz to 84.719GHz. Therefore, the electromagnetic wave loss of the transmission device in this embodiment is relatively small, and there is no need to set up a cross-layer transmission device and a corner transmission device separately.

[0054] In a further embodiment of this utility model, specific implementation method two includes the following:

[0055] Compared with the first specific embodiment described above, the main difference of the second specific embodiment 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. The first rectangular ridge 18 and the second rectangular ridge 24 can be a feed ridge or a waveguide ridge.

[0056] Wherein, the end of the first rectangular ridge 18 is kept at a distance from the front inner wall 143 of the transmission gap 14, and the end of the second rectangular ridge 24 is kept at a distance from the right inner wall 141 of the transmission gap 14.

[0057] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0058] Furthermore, in this utility model, descriptions involving terms such as "primary," "secondary," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "primary" or "secondary" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0059] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0060] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A millimeter-wave waveguide through-layer 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 disposed above the second rectangular waveguide (2) and the first rectangular waveguide (1) and the second rectangular waveguide (2) are arranged at right angles. 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) that are closed at the rear end. The bottom of the waveguide transmission cavity (16) of the first rectangular waveguide (1) is provided with a transmission gap (14) that communicates with the second waveguide transmission cavity (17). Electromagnetic waves propagating in the first rectangular waveguide (1) are coupled to the second rectangular waveguide (2) located below through the transmission gap (14) and propagate in the second waveguide transmission cavity (17).

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

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

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

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

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

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

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

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