A waveguide antenna plate for a millimeter wave waveguide antenna and a millimeter wave radar

Abstract

This invention relates to the field of radar antenna technology, and discloses a waveguide antenna board for a millimeter-wave waveguide antenna and a millimeter-wave radar, comprising: a first metal layer and a second metal layer; the first metal layer is disposed above the second metal layer, the layer above the first metal layer is a radiating layer, the layer below the first metal layer and the layer above the second metal layer together form a waveguide wiring layer, the layer below the second metal layer is a waveguide transition layer, and the radiating layer is provided with multiple waveguide antennas, corresponding to the transmit and receive channels of an RF chip, including a first RF chip and a second RF chip. The millimeter-wave waveguide antenna and millimeter-wave radar of this invention use a relatively small waveguide antenna board to form a large-size waveguide antenna board with multiple chips cascaded, and the structure is simple, effectively reducing the difficulty of manufacturing processes and mold complexity, improving product yield, and reducing production costs.

Description

Technical Field

[0001] This invention relates to the field of automotive radar antenna technology, and more particularly to a waveguide antenna plate for a millimeter-wave waveguide antenna and a millimeter-wave radar. 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 low cost and simple processing. However, microstrip lines have high losses and narrow bandwidth. Replacing the original microstrip antennas with waveguide antennas that have low losses and high bandwidth has naturally become an important direction for the performance breakthrough of 77GHz millimeter-wave radar. At present, millimeter-wave radar waveguide antenna boards are usually assembled in layers. However, due to the influence of processing technology, the larger the size of the antenna board, the more difficult it is to control the tolerance, and the greater the production difficulty. On the other hand, with the improvement of the performance requirements of millimeter-wave radar, the number of millimeter-wave radar transceiver antennas will inevitably increase accordingly. This leads to the size of millimeter-wave radar waveguide antenna boards becoming larger and the structure becoming more complex. Therefore, how to balance the relationship between millimeter-wave radar performance, waveguide antenna board size, and structural complexity has become an urgent problem to be solved. Summary of the Invention

[0003] This invention addresses the challenge of balancing millimeter-wave radar performance, waveguide antenna plate size, and structural complexity by proposing a waveguide antenna plate for millimeter-wave waveguide antennas, comprising:

[0004] A first metal layer 1 and a second metal layer 2 are provided. The first metal layer 1 is disposed above the second metal layer 2. The first metal layer 1 is a radiating layer. The first metal layer 1 and the second metal layer 2 together form a waveguide trace layer. The second metal layer 2 is a waveguide transition layer. The radiating layer is provided with multiple waveguide antennas, corresponding to the transmit and receive channels of the radio frequency chip. The chip includes a first radio frequency chip 71 and a second radio frequency chip 72.

[0005] As a preferred technical solution, the first metal layer 1 is composed of a third metal layer 11 and a fourth metal layer 12. The third metal layer 11 is provided with transmitting waveguide antennas 31-34 and receiving waveguide antennas 35-38, which correspond to the transmitting channel and receiving channel of the first radio frequency chip 71, respectively. The fourth metal layer 12 is provided with transmitting waveguide antennas 41-44 and receiving waveguide antennas 45-48, which correspond to the transmitting channel and receiving channel of the second radio frequency chip 72, respectively. A first rectangular slot 111 for waveguide routing is provided below the third metal layer 11, corresponding to each transmitting and receiving antenna of the first radio frequency chip 71. A second rectangular slot 121 for waveguide routing is provided below the fourth metal layer 12, corresponding to each transmitting and receiving antenna of the first radio frequency chip 72.

[0006] As a preferred technical solution, the second metal layer 2 is composed of a fifth metal layer 21 and a sixth metal layer 22. The fifth metal layer 21 is placed below the third metal layer 11 and is in close contact with the third metal layer 11. The sixth metal layer 22 is placed below the fourth metal layer 11 and is in close contact with the fourth metal layer 12. A third rectangular slot 211 is provided on the fifth metal layer 21, corresponding to the first rectangular slot 111 of each waveguide antenna waveguide trace on the third metal layer 11. The first rectangular slot 111 and the third rectangular slot 211 form a complete waveguide cavity to realize the waveguide traces of each transceiver antenna of the first RF chip 71. A fourth rectangular slot 221 is provided on the sixth metal layer 22, corresponding to the second rectangular slot 121 of each waveguide antenna waveguide trace on the fourth metal layer 12. The second rectangular slot 121 and the fourth rectangular slot 221 form a complete waveguide cavity to realize the waveguide traces of each transceiver antenna of the first RF chip 72.

[0007] As a preferred technical solution, a first waveguide interface boss 212 corresponding to the position of the RF transceiver waveguide port of the first RF chip 71 is provided under the fifth metal layer 21. The first waveguide interface boss 212 is higher than the surrounding area by an appropriate height, and the boss surface is smooth and flat. A rectangular groove surrounding the waveguide port is provided for each waveguide port of the first waveguide interface boss 212. A second waveguide interface boss 222 corresponding to the position of the RF transceiver waveguide port of the first RF chip 72 is provided under the sixth metal layer 22. The second waveguide interface boss 222 is higher than the surrounding area by an appropriate height, and the boss surface is smooth and flat. A rectangular groove surrounding the waveguide port is provided for each waveguide port of the second waveguide interface boss 222.

[0008] As a preferred technical solution, multiple positioning posts 51 and multiple supporting bosses 52 are provided below the fifth metal layer 21 and the sixth metal layer 22. The top surface of the bosses 52 is in the same plane as the waveguide interface. Positioning holes 73 are provided on the PCBA board 7 corresponding to the waveguide antenna board. The positioning posts 51 and the positioning holes 73 cooperate with each other to ensure the relative position between the waveguide antennas on the first metal layer 11 and the second metal layer 12.

[0009] The present invention also proposes a millimeter-wave radar, which includes: a millimeter-wave waveguide antenna; a waveguide antenna board for carrying the millimeter-wave waveguide antenna; a PCBA board (7) integrating a radio frequency chip; and waveguide ports corresponding one-to-one with the waveguide ports of the radio frequency chip, wherein the radio frequency chip is connected to the waveguide antenna board through the waveguide ports. The millimeter-wave waveguide antenna is used to transmit and receive signals from the radio frequency chip.

[0010] The present invention has the following beneficial effects:

[0011] The millimeter-wave radar designed in this invention uses a small waveguide antenna board to form a large-size waveguide antenna board with multiple chips cascaded together. The structure is simple, which effectively reduces the difficulty of manufacturing process and mold complexity, improves product yield and reduces production cost.

[0012] The millimeter-wave radar designed in this invention has a certain tolerance for the installation gap between the waveguide antenna board and the PCBA, which facilitates production and assembly, thereby ensuring the stability and consistency of antenna performance. Attached Figure Description

[0013] Figure 1 A schematic diagram of a millimeter-wave radar waveguide antenna plate structure according to an embodiment of the present invention is shown.

[0014] Figure 2 A perspective view of a millimeter-wave radar waveguide antenna plate structure according to an embodiment of the present invention is shown.

[0015] Figure 3 A top view of the first metal layer of a millimeter-wave radar waveguide antenna plate according to an embodiment of the present invention is shown.

[0016] Figure 4 A bottom view of the first metal layer of a millimeter-wave radar waveguide antenna plate according to an embodiment of the present invention is shown.

[0017] Figure 5 A perspective view of the first metal layer of a millimeter-wave radar waveguide antenna plate according to an embodiment of the present invention is shown.

[0018] Figure 6 An oblique view of the first metal layer of a millimeter-wave radar waveguide antenna plate according to an embodiment of the present invention is shown.

[0019] Figure 7 A top view of the second metal layer of a millimeter-wave radar waveguide antenna plate according to an embodiment of the present invention is shown.

[0020] Figure 8 A bottom view of the second metal layer of a millimeter-wave radar waveguide antenna plate according to an embodiment of the present invention is shown.

[0021] Figure 9 A perspective view of the second metal layer of a millimeter-wave radar waveguide antenna plate according to an embodiment of the present invention is shown.

[0022] Figure 10 An oblique view of the second metal layer of a millimeter-wave radar waveguide antenna plate according to an embodiment of the present invention is shown.

[0023] Figure 11 A top view of a millimeter-wave radar waveguide antenna according to an embodiment of the present invention is shown;

[0024] Figure 12 A perspective view of a millimeter-wave radar waveguide antenna according to an embodiment of the present invention is shown;

[0025] Figure 13 A side view of an EH waveguide conversion structure according to an embodiment of the present invention is shown;

[0026] Figure 14 A perspective view of an EH waveguide conversion structure according to an embodiment of the present invention is shown;

[0027] Figure 15 A top view of an EH waveguide conversion structure according to an embodiment of the present invention is shown;

[0028] Figure 16 A schematic diagram of a millimeter-wave radar PCBA board structure according to an embodiment of the present invention is shown;

[0029] Figure 17 The simulation curves of the S-parameters of a millimeter-wave radar waveguide antenna according to an embodiment of the present invention are shown.

[0030] Figure 18 A simulation curve showing the relationship between gain and frequency of a millimeter-wave radar waveguide antenna according to an embodiment of the present invention is shown.

[0031] Figure 19 The simulation curve of the EH conversion structure S21 according to an embodiment of the present invention is shown.

[0032] The attached figures are labeled as follows:

[0033] 311 Rectangular radiating slot, 312 Rectangular groove, 313 Rectangular waveguide, 314 Rectangular ridge, 315 Metal shorting surface;

[0034] PCBA board 7, first RF chip 71, second RF chip 72, positioning hole 73;

[0035] First metal layer 1, third metal layer 11, fourth metal layer 2

[0036] Transmitting waveguide antennas 31-34, receiving waveguide antennas 35-38; transmitting waveguide antennas 41-44, receiving waveguide antennas 45-48;

[0037] Second metal layer 2, fifth metal layer 21, sixth metal layer 22;

[0038] First rectangular slot 111, second rectangular slot 121, third rectangular slot 211, fourth rectangular slot 221;

[0039] First waveguide interface boss 212, second waveguide interface boss 222;

[0040] Positioning post 51, supporting boss 52;

[0041] EH waveguide conversion structure 8, first rectangular waveguide 81 and first rectangular waveguide 82;

[0042] First rectangular step 811, second rectangular step 812, third rectangular step 821, fourth rectangular step 822. Detailed Implementation

[0043] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” or “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0044] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention, and are not intended to indicate or imply that the elements referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0045] The present invention addresses the aforementioned task in the following manner: a millimeter-wave waveguide antenna, comprising: a rectangular waveguide 313; a plurality of rectangular radiating slots 311; the plurality of rectangular radiating slots 311 being arranged alternately along the longitudinal centerline of the rectangular waveguide 313; two rectangular slots 312, the two rectangular slots 312 being respectively arranged on both sides of the rectangular radiating slots 311; the long side of the rectangular radiating slot 311 being parallel to the longitudinal centerline of the rectangular waveguide 313 and deviating from the longitudinal centerline of the rectangular waveguide, or forming a certain angle with the longitudinal centerline of the rectangular waveguide 313.

[0046] Specifically, such as Figure 7 , Figure 11 , Figure 12 As shown, the waveguide antenna has multiple rectangular radiating slots 311 arranged alternately along the longitudinal centerline of a rectangular waveguide 313, and two rectangular slots 312 arranged on both sides of the radiating slots 311. The long side of the rectangular radiating slot 311 is parallel to the longitudinal centerline of the rectangular waveguide 313 and deviates from the longitudinal centerline of the rectangular waveguide by an appropriate distance, or it can form a certain angle with the longitudinal centerline of the rectangular waveguide. A rectangular ridge 314 of appropriate length, width, and height is provided in the middle of the bottom of the rectangular waveguide 313, or the rectangular ridge can be omitted. By adjusting the length of the radiating slots, the waveguide antenna can resonate and radiate efficiently in a specified frequency band. By adjusting the distance of the rectangular radiating slots 311 from the longitudinal centerline of the rectangular waveguide, the magnitude of the feed current of each radiating slot can be adjusted, thereby enabling... To achieve low sidelobes in the waveguide antenna elevation, the amplitude of the feed current for each radiating slot must conform to a specified distribution (such as Taylor distribution, Chebyshev distribution, SinZ-Z distribution, and Villeneuve distribution). One end of the rectangular waveguide 313 is the feed end of the waveguide antenna, which is connected to the EH waveguide conversion structure 8 through a section of the rectangular waveguide. The other end is shorted by metal. The matching of each radiating slot is adjusted by reflecting electromagnetic waves through the metal shorting surface 315. The rectangular radiating slots close to the metal shorting surface maintain an appropriate distance from the metal shorting surface, such as a quarter wavelength. The horizontal beamwidth of the waveguide antenna is adjusted by adjusting the distance of the rectangular slot 312 from the longitudinal centerline of the rectangular waveguide 313, as well as the width and depth of the rectangular slot 312.

[0047] This invention also provides a novel millimeter-wave radar, comprising: a waveguide antenna board for carrying a millimeter-wave waveguide antenna; a PCBA board (7) integrating a radio frequency chip; and waveguide ports corresponding one-to-one with the waveguide ports of the radio frequency chip, the radio frequency chip being connected to the waveguide antenna board through the waveguide ports. The millimeter-wave waveguide antenna is used to transmit and receive signals from the radio frequency chip.

[0048] In a preferred embodiment, the waveguide antenna board has a first metal layer and a second metal layer. The first metal layer is disposed above the second metal layer, and a radiating layer is located above the first metal layer. The area below the first metal layer and the area above the second metal layer together form a waveguide trace layer, and a waveguide transition layer is located below the second metal layer. The radiating layer has multiple radiating elements, corresponding to the eight transmit channels and eight receive channels of the two RF chips. By reasonably setting the coordinate positions of the transmit and receive antennas corresponding to each RF chip, the traces of the transmit and receive antennas of the two RF chips are made relatively independent. In this way, the originally large waveguide antenna board can be divided into two independent, smaller waveguide antenna boards according to the RF chips.

[0049] As a preferred embodiment, such as Figure 1 , Figure 2As shown, the waveguide antenna board has a first metal layer 1 and a second metal layer 2. The first metal layer 1 is disposed above the second metal layer 2. The top of the first metal layer 1 is a radiating layer. The area below the first metal layer and the area above the second metal layer together form a waveguide trace layer. The area below the second metal layer 2 is a waveguide transition layer. The radiating layer is provided with multiple waveguide antennas, corresponding to the eight transmit channels and eight receive channels of two RF chips (first RF chip 71 and second RF chip 72). By reasonably setting the coordinate positions of the transmit and receive antennas corresponding to each RF chip, the traces of the transmit and receive antennas of the two RF chips are made relatively independent. In this way, the originally large waveguide antenna board can be divided into two independent smaller waveguide antenna boards according to the RF chips.

[0050] As a preferred embodiment, such as Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the first metal layer 1 is composed of a third metal layer 11 and a fourth metal layer 12. The dimensions of the third metal layer 11 and the fourth metal layer 12 can be the same or different. The shapes of the third metal layer 11 and the fourth metal layer 12 can be rectangular or irregular. Four transmitting waveguide antennas (31-34) and four receiving waveguide antennas (35-38) are provided on the third metal layer 11, corresponding to the four transmitting channels and four receiving channels of the first RF chip 71, respectively. Four transmitting waveguide antennas (41-44) and four receiving waveguide antennas (45-48) are provided on the fourth metal layer 12, corresponding to the four transmitting channels and four receiving channels of the second RF chip 72, respectively. A first rectangular slot 111 for waveguide routing is provided below the third metal layer 11, corresponding to each transmitting and receiving antenna of the first RF chip 71. A second rectangular slot 121 for waveguide routing is provided below the fourth metal layer 12, corresponding to each transmitting and receiving antenna of the first RF chip 72. Preferably, the first metal layer 1 has a length of 80mm and a width of 60mm, and is divided into two rectangular metal layers, each with a size of 40*60mm. The third metal layer 11 and the fourth metal layer 12 can be manufactured by metal CNC machining, or by plastic CNC machining or plastic injection molding followed by metallization.

[0051] In a preferred embodiment, the maximum horizontal spacing between the eight transmitting antennas of the waveguide antenna plate is 29.5 wavelengths (the maximum horizontal spacing is between transmitting antenna 31 and transmitting antenna 42), and the maximum elevation spacing is 19.5 wavelengths (the maximum elevation spacing is between transmitting antenna 42 and transmitting antenna 44). The maximum horizontal spacing between the eight receiving antennas is 29.5 wavelengths (the maximum horizontal spacing is between receiving antenna 36 and receiving antenna 45), and the maximum elevation spacing is 19.5 wavelengths (the maximum elevation spacing is between receiving antenna 31 and receiving antenna 36). The maximum virtual horizontal aperture of the virtual waveguide antenna is 58.5 wavelengths, and the maximum virtual elevation aperture is 39.5 wavelengths, calculated according to the angular resolution formula:

[0052] θ res =λ / (d*cos(α))

[0053] Where λ is the wavelength of the electromagnetic wave, d is the antenna aperture, and α is the azimuth angle.

[0054] It can be calculated that, without using super-resolution algorithms, the radar with this configuration has a horizontal angular resolution of 1.98° at an azimuth angle of 0° and an elevation angular resolution of 2.94°.

[0055] As a preferred embodiment, such as Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 16As shown, the second metal layer 2 is composed of a fifth metal layer 21 and a sixth metal layer 22. The fifth metal layer 21 and the sixth metal layer 22 can have the same or different dimensions. The fifth metal layer 21 and the sixth metal layer 22 can be rectangular or irregular in shape. The fifth metal layer 21 is placed below the third metal layer 11 and is in close contact with the third metal layer 11. The sixth metal layer 22 is placed below the fourth metal layer 12 and is in close contact with the fourth metal layer 12. A surface is provided on the top of the fifth metal layer 21 that is in contact with the third metal layer 11. The first rectangular slot 111 on the waveguide antenna of the first radio frequency chip 71 is connected to the third rectangular slot 211 corresponding to the first rectangular slot 111. The first rectangular slot 111 and the third rectangular slot 211 form a complete waveguide cavity to realize the waveguide routing of each transceiver antenna of the first radio frequency chip 71. The sixth metal layer 22 is provided with a fourth rectangular slot 221 corresponding to the second rectangular slot 121 on the waveguide antenna of the fourth metal layer 12. The second rectangular slot 121 and the fourth rectangular slot 221 form a complete waveguide cavity to realize the waveguide routing of each transceiver antenna of the first radio frequency chip 72. Below the fifth metal layer 21, a first waveguide interface boss 212 is provided, corresponding to the position of the RF transceiver waveguide port of the first RF chip 71. The first waveguide interface boss 212 is raised to an appropriate height above the periphery, and the boss surface is smooth and flat. Each waveguide port of the first waveguide interface boss 212 is provided with a rectangular groove surrounding the waveguide port. The height and depth of the rectangular groove are reasonably set to prevent electromagnetic leakage caused by gaps when the first waveguide port boss 212 is assembled with the PCB. Below the sixth metal layer 22, a second waveguide interface boss 222 is provided, corresponding to the position of the RF transceiver waveguide port of the first RF chip 72. The second waveguide interface boss 222 is raised to an appropriate height above the periphery, and the boss surface is smooth and flat. Each waveguide port of the second waveguide interface boss 222 is provided with a rectangular groove surrounding the waveguide port. The height and depth of the rectangular groove are reasonably set to prevent electromagnetic leakage caused by gaps when the second waveguide port boss 222 is assembled with the PCB. The fifth metal layer 21 and the sixth metal layer 22 can be made by metal CNC machining, or by plastic CNC machining or plastic injection molding followed by metallization.

[0056] As a preferred embodiment, such as Figure 8 , Figure 16 Multiple high-precision positioning posts 51 and multiple support bosses 52 are provided at appropriate positions below the fifth metal layer 21 and the sixth metal layer 22. The top surface of the bosses is in the same plane as the waveguide interface. High-precision positioning holes 73 are provided on the PCBA board 7 corresponding to the waveguide antenna board. The relative positions between the waveguide antennas on the first metal layer 11 and the second metal layer 12 are ensured by the cooperation of these positioning posts 51 and positioning holes 73.

[0057] As a preferred embodiment, the assembly method between the third metal layer 11 and the fifth metal layer 21 and between the fourth metal layer 12 and the sixth metal layer 22 depends on the materials used for these four metal layers. If a metallized plastic component structure is used, the two structural components can be soldered together by low-temperature solder paste SMT. If a metal CNC component structure is used, the two structural components can be soldered together by vacuum soldering.

[0058] As a preferred embodiment, such as Figure 13 , Figure 14 , Figure 15The EH waveguide conversion structure 8 has a first rectangular waveguide 81 with its wide side horizontally placed and a second rectangular waveguide 82 with its narrow side horizontally placed. The longitudinal centerline of the first rectangular waveguide 81 with its wide side horizontally placed is perpendicular to the longitudinal centerline of the second rectangular waveguide 82 with its narrow side horizontally placed. The top walls of the first rectangular waveguide 81 with its wide side horizontally placed and the top walls of the second rectangular waveguide 82 with its narrow side horizontally placed are in the same plane. The end of the first rectangular waveguide 81 with its wide side horizontally placed is shorted by the right side wall of the second rectangular waveguide 82 with its narrow side horizontally placed. A first rectangular step 811 and a second rectangular step 82 are provided on the top wall of the end of the first rectangular waveguide 81 with its wide side horizontally placed. A first rectangular step 811 is placed on top of a second rectangular step 812. The width w1 of the first rectangular step 811 is 0.8 to 1.1 times the width a81 of the wide side of the rectangular waveguide 81. The height h1 and length L1 of the first rectangular step 811 are both less than the width b81 of the narrow side of the first rectangular waveguide 81. The length L2 of the second rectangular step 812 is the same as the length L1 of the first rectangular step 811. The width w2 of the second rectangular step 812 is less than the width w1 of the first rectangular step 811. The sum of the height h2 of the second rectangular step 812 and the height h1 of the first rectangular step 811 is equal to the width b81 of the narrow side of the first rectangular waveguide 81. The width is b81, i.e., h1 + h2 = b81. The first rectangular step 811 is close to the top wall of the first rectangular waveguide 81 with its wide side horizontally placed and the right side wall of the second rectangular waveguide 82 with its narrow side horizontally placed. The end of the second rectangular waveguide 82 with its narrow side horizontally placed is shorted by the left side wall of the second rectangular waveguide 82 with its wide side horizontally placed. A third rectangular step 821 and a fourth rectangular step 822 are provided on the bottom surface of the end of the second rectangular waveguide 82 with its narrow side horizontally placed. The fourth rectangular step 822 is provided on top of the third rectangular step 821. The third rectangular step 821 is provided on the bottom surface of the end of the second rectangular waveguide 82. The third rectangular step 821 and the fourth rectangular step 822 are provided on top of the third rectangular step 821. The width of the fourth rectangular step 822 is the same as the width of the narrow side of the second rectangular waveguide 82 with its narrow side horizontally placed. The length of the third rectangular step 821 is greater than the length of the fourth rectangular step 822. The lengths of both the third and fourth rectangular steps 821 are less than the width of the wide side of the first rectangular waveguide 81 with its wide side horizontally placed. The sum of the heights h821 of the third rectangular step 821 and h822 of the fourth rectangular step 822 is equal to the difference between the width a82 of the wide side of the second rectangular waveguide 82 with its narrow side horizontally placed and the width b81 of the narrow side of the first rectangular waveguide 81 with its wide side horizontally placed, i.e., h821 + h822 = a82 - b81.

[0059] As a preferred embodiment. Figure 16 and Figure 17 A waveguide antenna according to an embodiment of the present invention is shown, consisting of... Figure 16 and Figure 17It can be seen that the waveguide antenna operates in the frequency band of 75.34GHz to 82.95GHz, with a bandwidth of 7.61GHz@-10dB. The antenna has good gain flatness in the operating frequency band, with a maximum gain of 15.46dBi.

[0060] As a preferred embodiment. Figure 19 The simulation curve of the EH conversion structure S21 according to an embodiment of the present invention is shown. It can be seen from the figure that in the frequency range of 74.17GHz to 84.04GHz, the insertion loss (S21) of the EH conversion structure is less than 0.1dB, with a wide bandwidth and very small insertion loss.

[0061] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waveguide antenna plate for a millimeter-wave waveguide antenna, characterized in that, The waveguide antenna plate includes: First metal layer (1) and second metal layer (2); The first metal layer (1) is disposed above the second metal layer (2). The first metal layer (1) is a radiation layer on top. The first metal layer (1) and the second metal layer (2) together form a waveguide trace layer. The second metal layer (2) is a waveguide transition layer on the bottom. The radiation layer is provided with multiple waveguide antennas, corresponding to the transmit channel and receive channel of the radio frequency chip. The first radio frequency chip (71) and the second radio frequency chip (72) are included.

2. The waveguide antenna plate for a millimeter-wave waveguide antenna according to claim 1, characterized in that, The first metal layer (1) is composed of a third metal layer (11) and a fourth metal layer (12). The third metal layer (11) is provided with a transmitting waveguide antenna (31-34) and a receiving waveguide antenna (35-38), which correspond to the transmitting channel and receiving channel of the first radio frequency chip (71), respectively. The fourth metal layer (12) is provided with a transmitting waveguide antenna (41-44) and a receiving waveguide antenna (45-48), which correspond to the transmitting channel and receiving channel of the second radio frequency chip (72), respectively. A first rectangular slot (111) for waveguide routing corresponding to each transmitting and receiving antenna of the first radio frequency chip (71) is provided below the third metal layer (11). A second rectangular slot (121) for waveguide routing corresponding to each transmitting and receiving antenna of the first radio frequency chip (72) is provided below the fourth metal layer (12).

3. The waveguide antenna plate for a millimeter-wave waveguide antenna according to claim 2, characterized in that, The second metal layer (2) is composed of a fifth metal layer (21) and a sixth metal layer (22). The fifth metal layer (21) is placed below the third metal layer (11) and is in close contact with the third metal layer (11). The sixth metal layer (22) is placed below the fourth metal layer (11) and is in close contact with the fourth metal layer (12). A third rectangular slot (211) corresponding to the first rectangular slot (111) is provided on the fifth metal layer (21). The first rectangular slot (111) and the third rectangular slot (211) form a complete waveguide cavity to realize the waveguide routing of each transceiver antenna of the first radio frequency chip (71). A fourth rectangular slot (221) corresponding to the second rectangular slot (121) is provided on the sixth metal layer (22). The second rectangular slot (121) and the fourth rectangular slot (221) form a complete waveguide cavity to realize the waveguide routing of each transceiver antenna of the first radio frequency chip (72).

4. The waveguide antenna plate for a millimeter-wave waveguide antenna according to claim 3, characterized in that, A first waveguide interface boss (212) is provided under the fifth metal layer (21) and corresponds to the position of the RF transceiver waveguide port of the first RF chip (71). The first waveguide interface boss (212) is higher than the surrounding area by an appropriate height and the boss surface is smooth and flat. A rectangular groove surrounding the waveguide port is provided for each waveguide port of the first waveguide interface boss (212). A second waveguide interface boss (222) is provided under the sixth metal layer (22) and corresponds to the position of the RF transceiver waveguide port of the first RF chip (72). The second waveguide interface boss (222) is higher than the surrounding area by an appropriate height and the boss surface is smooth and flat. A rectangular groove surrounding the waveguide port is provided for each waveguide port of the second waveguide interface boss (222).

5. A waveguide antenna plate for a millimeter-wave waveguide antenna according to claim 4, characterized in that, Multiple positioning posts (51) and multiple supporting bosses (52) are provided below the fifth metal layer (21) and the sixth metal layer (22). The top surface of the bosses (52) is in the same plane as the waveguide interface. Positioning holes (73) are provided on the PCBA board (7) corresponding to the waveguide antenna board. The positioning posts (51) and positioning holes (73) cooperate with each other to ensure the relative position between the waveguide antennas on the first metal layer (11) and the second metal layer (12).

6. A millimeter-wave radar, characterized in that, The millimeter-wave radar includes: Millimeter-wave waveguide antenna; The waveguide antenna plate according to any one of claims 1-5; PCBA board (7), the PCBA board integrates an RF chip; and is provided with waveguide ports corresponding one-to-one with the waveguide ports of the RF chip, the RF chip is connected to the waveguide antenna board through the waveguide ports; the millimeter wave waveguide antenna is used to transmit and receive signals from the RF chip.

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