Cascade millimeter wave radar system synchronization signal power division device

Abstract

The invention relates to the technical field of power dividers, in particular to a power dividing device for synchronizing signals of a cascade millimeter wave radar system. The power dividing device comprises three conversion assemblies and a power dividing part. Wherein one conversion assembly is an input conversion assembly, and the other conversion assemblies are output conversion assemblies; the conversion assembly comprises a first coplanar waveguide structure and a first substrate integrated waveguide structure. The coplanar waveguide technology and the substrate integrated waveguide technology are simultaneously adopted in the power dividing device provided by the invention. The coplanar waveguide structure is utilized to realize input and output of signals, and the substrate integrated waveguide structure is utilized to realize power division processing of the signals, so that the power division device has the advantages of low process difficulty, low cost, strong anti-interference performance, low transmission loss and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of power dividers, and in particular relates to a power divider for synchronous signals of a cascaded millimeter-wave radar system. Background Art

[0002] 4D millimeter wave radar, also known as 4D imaging millimeter wave radar, can simultaneously obtain the distance, direction, height and speed (4D information) of the target to achieve imaging of the target. Compared with traditional 3D millimeter wave radar, 4D millimeter wave radar has higher resolution and imaging capabilities, and can more accurately identify and track objects. Therefore, 4D millimeter wave radar has also become a research hotspot in the field of automotive radar.

[0003] At present, the main technical solution for realizing 4D millimeter-wave radar is to cascade multiple millimeter-wave radar chips, and the synchronization of local oscillator signals between chips is one of the key technologies for cascading multiple millimeter-wave radar chips. The current synchronization method mainly uses Wilkinson power divider or power divider chip to divide the local oscillator signal of the main chip, and then transmits it to all radar chips synchronously through microstrip. This design has the disadvantages of large transmission loss and poor shielding. Summary of the invention

[0004] In view of the above problems, the present invention provides a power division device for synchronization signals of a cascaded millimeter-wave radar system, wherein the power division device comprises three conversion components and a power division part; wherein one conversion component is an input conversion component, and the other two conversion components are output conversion components; The conversion component comprises a first coplanar waveguide structure and a first substrate integrated waveguide structure; the first substrate integrated waveguide structure is arranged outside the first coplanar waveguide structure, and the transmission path of the first substrate integrated waveguide structure in the same conversion component is the same as the transmission path of the first coplanar waveguide structure; The power division part includes a second substrate integrated waveguide structure, which is divided into a power division input end and two power division output ends; The first substrate integrated waveguide structure of the input conversion component is connected to the power division input end of the power division part; the first substrate integrated waveguide structure of each output conversion component is connected to each power division output end of the power division part in a one-to-one manner.

[0005] Further, the input conversion component includes an input part and a first transition part; the input end of the first transition part is connected to the output end of the input part, and the output end of the first transition part is connected to the power division input end of the power division part; The output conversion component includes an output part and a second transition part; the input end of the second transition part is connected to the power division output end of the power division part, and the output end of the second transition part is connected to the input end of the output part.

[0006] Furthermore, the power splitter device comprises an upper metal layer, a dielectric layer and a lower metal layer; the upper metal layer, the dielectric layer and the lower metal layer are stacked in sequence; The first coplanar waveguide structure is arranged on the upper metal layer; the first substrate integrated waveguide structure and the second substrate integrated waveguide structure are respectively composed of a plurality of metal holes, each of which passes through the upper metal layer, the dielectric layer and the lower metal layer in sequence.

[0007] Further, the input portion includes a first central band and two parallel first metal perforated bands; two parallel first channels are arranged on both sides of the first central band; the two first metal perforated bands are respectively arranged on one side of the two first channels away from the first central band; the length directions of the first central band, the first metal perforated band and the first channel are parallel; The first center band and the first channel are both arranged on the upper metal layer; the metal holes in the first metal hole band sequentially penetrate the upper metal layer, the dielectric layer and the lower metal layer; and the input end of the first center band, one end of the first metal hole band and one end of the first channel are all located at one side edge of the upper metal layer.

[0008] Further, the first transition portion includes two symmetrically arranged second channels and two symmetrically arranged second metal perforated bands; one end of each second channel is respectively connected to one end of a first channel, and the distance between the ends of the two second channels away from the first channel is greater than the width of the first center band; one end of each second metal perforated band is connected to one end of a first metal perforated band, and the distance between the ends of the two second metal perforated bands away from the first metal perforated band is greater than the distance between parallel holes of the two first metal perforated bands; The included angle between the first channel and the second channel is greater than the included angle between the first metal hole belt and the second metal hole belt.

[0009] Further, each of the output parts comprises a second central band and two parallel third metal perforated bands; two parallel third channels are arranged on both sides of the second central band; the two third metal perforated bands are respectively arranged on one side of the two third channels away from the second central band; the length directions of the second central band, the third metal perforated band and the third channel in the same output part are parallel; The second center band and the third channel are both arranged on the upper metal layer; the metal holes in the third metal hole band sequentially penetrate the upper metal layer, the dielectric layer and the lower metal layer; and the output end of the second center band, one end of the third metal hole band and one end of the third channel are all located at the other side edge of the upper metal layer.

[0010] Further, each of the second transition portions includes two symmetrically arranged fourth channels and two symmetrically arranged fourth metal perforated bands; one end of each fourth channel is respectively connected to one end of a third channel, and the distance between the ends of the two fourth channels away from the third channel is greater than the width of the second center band; one end of each fourth metal perforated band is connected to one end of a third metal perforated band, and the distance between the ends of the two fourth metal perforated bands away from the third metal perforated band is greater than the parallel hole distance between the two third metal perforated bands; The included angle between the third channel and the fourth channel is greater than the included angle between the third metal hole belt and the fourth metal hole belt.

[0011] Furthermore, the power division input end of the power division part includes two parallel fifth metal hole belts, and one end of the two fifth metal hole belts is respectively connected to one end of the two second metal hole belts in the first transition part away from the input part; Each power division output end of the power division part includes two parallel sixth metal hole belts, and one end of the two sixth metal hole belts of each power division output end is respectively connected to one end of two fourth metal hole belts in a second transition part away from the output part.

[0012] The beneficial effects of the present invention are: 1. A substrate integrated waveguide structure is set in the conversion component part, which not only realizes the transformation of the signal transmission mode, but also the metal wall surface of the substrate integrated waveguide structure can effectively suppress the generation of parasitic current in the coplanar waveguide circuit, thereby reducing the circuit transmission loss.

[0013] 2. The power division device proposed in the present invention adopts both coplanar waveguide technology and substrate integrated waveguide technology. The coplanar waveguide structure is used to realize signal input and output, and the substrate integrated waveguide structure is used to realize signal power division processing. Therefore, the power division device has the advantages of low process difficulty, low cost, strong anti-interference, and low transmission loss.

[0014] 3. The power distribution device in the present invention has the advantages of small size, light weight, low processability and easy integration.

[0015] 4. Different impedance matching requirements in the application of the power division device can be achieved by adjusting the angle between the first channel and the second channel, the angle between the first metal hole band and the second metal hole band, the angle between the third channel and the fourth channel, and the angle between the third metal hole band and the fourth metal hole band.

[0016] 5. The power division part of the present invention adopts substrate integrated waveguide technology, and by setting the transmission paths of the two power division output ends in the same straight line direction, the transmission path of the power division input end is perpendicular to the transmission paths of the two power division output ends, which can ensure that the distributed signal power and phase of the transmission path of each power division output end are equal.

[0017] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A front view of a power splitter device according to an embodiment of the present invention is shown; Figure 2 A side cross-sectional view of a power splitter device according to an embodiment of the present invention is shown; Figure 3 A schematic diagram showing the structure of an input conversion component according to an embodiment of the present invention is shown; Figure 4 A schematic diagram showing the structure of an output conversion component according to an embodiment of the present invention is shown; Figure 5 A schematic diagram showing the structure of a power division unit according to an embodiment of the present invention is shown; Figure 6 A simulation experiment data diagram of an embodiment of the present invention is shown.

[0020] In the figure: 1-conversion component; 2-power division part; 3-upper metal layer; 4-dielectric layer; 5-lower metal layer; 6-first metal hole band; 7-first channel; 8-first center band; 9-second channel; 10-second metal hole band; 11-third metal hole band; 12-third channel; 13-second center band; 14-fourth channel; 15-fourth metal hole band; 16-fifth metal hole band; 17-sixth metal hole band; 18-seventh metal hole band. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The present invention provides a power splitter for cascaded millimeter wave radar system synchronization signals, such as Figure 1As shown, the power division device includes three conversion components 1 and a power division part 2; wherein, one conversion component 1 is an input conversion component, and the other two conversion components 1 are output conversion components.

[0023] The conversion component 1 includes a first coplanar waveguide structure and a first substrate integrated waveguide structure; the first substrate integrated waveguide structure is arranged on the outside of the first coplanar waveguide structure, and the transmission path of the first substrate integrated waveguide structure in the same conversion component 1 is the same as the transmission path of the first coplanar waveguide structure.

[0024] A substrate integrated waveguide structure is set in the conversion component part, which not only realizes the conversion of the signal transmission mode, but also the metal wall surface of the substrate integrated waveguide structure can effectively suppress the generation of parasitic current in the coplanar waveguide circuit, thereby reducing the circuit transmission loss.

[0025] Furthermore, the power division part 2 includes a second substrate integrated waveguide structure, which is divided into a power division input end and two power division output ends.

[0026] The first substrate integrated waveguide structure of the input conversion component is connected to the power division input end of the power division part 2; the first substrate integrated waveguide structure of each output conversion component is connected to each power division output end of the power division part 2 one-to-one.

[0027] The design characteristics of coplanar waveguide technology (CPW) can reduce the loss during signal transmission, while achieving a wider operating frequency range and high frequency response, meeting the bandwidth requirements of various RF systems; and coplanar waveguide also has the advantages of low process difficulty, integration-based, and strong anti-interference. Substrate Integrated Waveguide (SIW) technology has the advantages of high inductance Q value, low cost, and easy integration with planar circuits. The power division device proposed in the present invention uses both coplanar waveguide technology and substrate integrated waveguide technology. The coplanar waveguide structure is used to realize signal input and output, and the substrate integrated waveguide structure is used to realize signal power division processing. Therefore, the power division device has the advantages of low process difficulty, low cost, strong anti-interference, and low transmission loss.

[0028] Specifically, Figure 1 As shown, the input conversion component includes an input part and a first transition part; the input end of the first transition part is connected to the output end of the input part, and the output end of the first transition part is connected to the power division input end of the power division part 2.

[0029] The output conversion component includes an output part and a second transition part; the input end of the second transition part is connected to the power division output end of the power division part 2, and the output end of the second transition part is connected to the input end of the output part.

[0030] The input part and the output part have the same structure, and a transition part is set between the input part and the power division part, and between the output part and the power division part, respectively, to switch the signal transmission mode. This ensures that the device can achieve the optimal performance state in both signal transmission and power division processing, reduces signal transmission loss, and improves the electromagnetic shielding effect of the device.

[0031] Further, such as Figure 2 As shown, the power splitter comprises an upper metal layer 3, a dielectric layer 4 and a lower metal layer 5; the upper metal layer 3, the dielectric layer 4 and the lower metal layer 5 are stacked in sequence. The first coplanar waveguide structure is arranged on the upper metal layer 3; the first substrate integrated waveguide structure and the second substrate integrated waveguide structure are respectively composed of a plurality of metal holes, and the metal holes penetrate the upper metal layer 3, the dielectric layer 4 and the lower metal layer 5.

[0032] Exemplarily, the upper metal layer 3 and the lower metal layer 5 are both made of copper, and the thickness of the upper metal layer 3 and the lower metal layer 7 are both 20 μm. The dielectric layer 4 is made of high-frequency circuit board material of model Rogers 3003G2, and the thickness is 0.127 mm.

[0033] The power splitter device in the present invention has the advantages of small size, light weight, low processability, and easy integration.

[0034] Specifically, Figure 3 As shown, the input portion includes a first center band 8 and two parallel first metal hole bands 6; two parallel first channels 7 are arranged on both sides of the first center band 8; the two first metal hole bands 6 are respectively arranged on the side of the two first channels 7 away from the first center band 8; the length directions of the first center band 8, the first metal hole band 6 and the first channel 7 are parallel.

[0035] The first center band 8 and the first channel 7 are both arranged on the upper metal layer 3; the first metal hole band 6 includes a plurality of equidistantly arranged metal holes, and each metal hole in the first metal hole band 6 sequentially penetrates the upper metal layer 3, the dielectric layer 4 and the lower metal layer 5; and the input end of the first center band 8, one end of the first metal hole band 6 and one end of the first channel 7 are all located at one side edge of the upper metal layer 3.

[0036] For example, the first center band 8 has a width of 0.27 mm and a length of 3 mm. The first channel 7 has a width of 0.1 The diameter of each metal hole in the first metal hole belt 6 is 0.15 mm, and the distance between the centers of any two adjacent metal holes is 0.3 mm; the parallel distance between the two first metal hole belts 6 is 0.77 mm.

[0037] The first center band is a signal input port of the power division device, and the local oscillator synchronization signal of the radar is input into the power division device through the first center band.

[0038] Further, such as Figure 3 As shown, the first transition portion includes two symmetrically arranged second channels 9 and two symmetrically arranged second metal perforated belts 10; one end of each second channel 9 is respectively connected to one end of a first channel 7, and the distance between the ends of the two second channels 9 away from the first channel 7 is greater than the width of the first center belt 8; one end of each second metal perforated belt 10 is connected to one end of a first metal perforated belt 6, and the distance between the ends of the two second metal perforated belts 10 away from the first metal perforated belt 6 is greater than the parallel hole distance between the two first metal perforated belts 6.

[0039] The included angle between the first channel 7 and the second channel 9 and the included angle between the first metal hole belt 6 and the second metal hole belt 10 are both obtuse angles; and the included angle between the first channel 7 and the second channel 9 is greater than the included angle between the first metal hole belt 6 and the second metal hole belt 10.

[0040] The second channel 9 is arranged on the upper metal layer 3; the second metal hole belt 10 includes a plurality of metal holes arranged at equal intervals, and each metal hole in the second metal hole belt 10 sequentially penetrates the upper metal layer 3, the dielectric layer 4 and the lower metal layer 5.

[0041] Exemplarily, the included angle between the first channel 7 and the second channel 9 is 161°; the maximum distance between two second channels 9 is 2 mm, and the length along the signal transmission direction is 2.5 mm.

[0042] The angle between the first metal hole belt 6 and the second metal hole belt 10 is 129°; the maximum spacing between the two second metal hole belts 10 is 6.5mm, and the length along the signal transmission direction is 2.2mm. The diameter of each metal hole in the second metal hole belt 10 is 0.15mm, and the distance between the centers of any two adjacent metal holes is 0.3mm.

[0043] The first transition part is a converter that converts the local oscillation synchronization signal transmitted through the waveguide coplanar structure into a substrate integrated waveguide structure. In addition, the angle between the first channel and the second channel, and the angle between the first metal hole belt and the second metal hole belt can be adjusted to achieve different impedance matching requirements in the application of the power division device.

[0044] Further, such as Figure 4As shown, each of the output parts includes a second center band 13 and two parallel third metal hole bands 11; two parallel third channels 12 are arranged on both sides of the second center band 13; the two third metal hole bands 11 are respectively arranged on the side of the two third channels 12 away from the second center band 13; the length directions of the second center band 13, the third metal hole band 11 and the third channel 12 in the same output part 2 are parallel.

[0045] The second center band 13 and the third channel 12 are both arranged on the upper metal layer 3; the third metal hole band 11 includes a plurality of equidistantly arranged metal holes, and each metal hole in the third metal hole band 11 sequentially penetrates the upper metal layer 3, the dielectric layer 4 and the lower metal layer 5; and the output end of the second center band 13, one end of the third metal hole band 11 and one end of the third channel 12 are all located at the other side edge of the upper metal layer 3.

[0046] Specifically, the width of the second center band 13 is 0.27 mm and the length is 3 mm. The width of the third channel 12 is 0.1 mm and the length is 3 mm. The diameter of each metal hole in the third metal hole band 11 is 0.15 mm, and the distance between the centers of any two adjacent metal holes is 0.3 mm; the parallel distance between two third metal hole bands 11 is 0.77 mm.

[0047] The second center band is a signal output port of the power division device, and the synchronization signal with equal power and the same phase output by the power division part is transmitted to the radar chip to be cascaded through each second center band.

[0048] Further, such as Figure 4 As shown, each of the second transition portions includes two symmetrically arranged fourth channels 14 and two symmetrically arranged fourth metal perforated bands 15; one end of each fourth channel 14 is respectively connected to one end of a third channel 12, and the distance between the ends of the two fourth channels 14 away from the third channel 12 is greater than the width of the second center band 13; one end of each fourth metal perforated band 15 is connected to one end of a third metal perforated band 11, and the distance between the ends of the two fourth metal perforated bands 15 away from the third metal perforated bands 11 is greater than the parallel hole distance between the two third metal perforated bands 11.

[0049] The included angle between the third channel 12 and the fourth channel 14 and the included angle between the third metal hole belt 11 and the fourth metal hole belt 15 are both obtuse angles; and the included angle between the third channel 12 and the fourth channel 14 is greater than the included angle between the third metal hole belt 11 and the fourth metal hole belt 15.

[0050] The fourth channel 14 is arranged on the upper metal layer 3; the fourth metal hole belt 15 includes a plurality of metal holes arranged at equal intervals, and each metal hole in the fourth metal hole belt 15 sequentially penetrates the upper metal layer 3, the dielectric layer 4 and the lower metal layer 5.

[0051] Exemplarily, the included angle between the third channel 12 and the fourth channel 14 is 161°; the maximum distance between two fourth channels 14 is 2 mm, and the length along the signal transmission direction is 2.5 mm.

[0052] The angle between the third metal hole belt 11 and the fourth metal hole belt 15 is 129°; the maximum spacing between the two fourth metal hole belts 15 is 6.5 mm, and the length along the signal transmission direction is 2.2 mm. The diameter of each metal hole in the fourth metal hole belt 15 is 0.15 mm, and the distance between the centers of any two adjacent metal holes is 0.3 mm.

[0053] The second transition part is a converter that converts the synchronization information processed by the power division part through the substrate integrated waveguide structure to be transmitted through the waveguide coplanar structure. In addition, the angle between the third channel and the fourth channel, and the angle between the third metal hole belt and the fourth metal hole belt can be adjusted to achieve different impedance matching requirements in the application of the power division device.

[0054] Furthermore, the power division input terminal is connected to each power division output terminal respectively; Figure 5 As shown, the power division input end of the power division part 2 includes two parallel fifth metal hole belts 16, and one end of the two fifth metal hole belts 16 is respectively connected to one end of the two second metal hole belts 10 away from the input part 1; each power division output end of the power division part 2 includes two parallel sixth metal hole belts 17, and one end of the two sixth metal hole belts 17 of each power division output end is respectively connected to one end of two fourth metal hole belts 15 in a second transition part away from the output part.

[0055] Specifically, the fifth metal hole belt 16 and the sixth metal hole belt 17 respectively include a plurality of metal holes arranged at equal intervals, and each metal hole sequentially penetrates the upper metal layer 3 , the dielectric layer 4 and the lower metal layer 5 .

[0056] Exemplarily, the diameter of each metal hole in the fifth metal hole belt 16 and the sixth metal hole belt 17 is 0.15 mm; the distance between the centers of any two adjacent metal holes in each metal hole belt is 0.3 mm; the parallel spacing between the two fifth metal hole belts 16 is 6.5 mm, and the parallel spacing between the two sixth metal hole belts 17 at the same power divider output end is 6.5 mm.

[0057] It should be noted that in practical applications, the circuit has specific impedance requirements for the input part, output part, power splitter input end and each power splitter output end. For example, the circuit requires that the impedance of the connection ports such as the input part, output part, power splitter input end and each power splitter output end reaches 50 ohms. For the coplanar waveguide structure of the input part and the output part, its partial characteristic impedance is 50 ohms, which can meet the circuit requirements. However, the impedance of the substrate integrated waveguide structure of the power splitter input end and each power splitter output end cannot directly reach 50 ohms. Therefore, it is necessary to adjust the angle between the first metal hole belt and the second metal hole belt in the first transition part, and the angle between the third metal hole belt and the fourth metal hole belt in the second transition part, respectively, to ensure that the impedance of the power splitter input end and each power splitter output end can reach 50 ohms. Among them, the angle between the first metal hole belt and the second metal hole belt is related to the parallel spacing of the two fifth metal hole belts; the angle between the third metal hole belt and the fourth metal hole belt is related to the parallel spacing of the two sixth metal hole belts of the same power splitter output end.

[0058] Further, such as Figure 5 As shown, the power division part 2 further includes a seventh metal hole belt 18, and the seventh metal hole belt 18 is arranged at the symmetry axis of the power division part 2. The seventh metal hole belt 18 includes one metal hole or a plurality of metal holes arranged equidistantly; each metal hole in the seventh metal hole belt 18 is a port tuning metal via.

[0059] For example, Figure 5 As shown, the seventh metal hole belt 18 includes three equidistantly arranged metal holes, each of which has a diameter of 0.15 mm, and a distance between the centers of any two adjacent metal holes is 1.1 mm.

[0060] It should be noted that the various structural dimension data mentioned in the embodiments of the present invention are only exemplary. According to actual application requirements, the various structural dimensions can be adaptively adjusted and are not limited here.

[0061] Preferably, Figure 5 As shown, the connection angle between a sixth metal hole belt 17 at the power division output end and a fifth metal hole belt 16 at the power division input end connected thereto is a right angle.

[0062] By setting the transmission paths of the two power splitter output ends in the same straight line direction, the transmission path of the power splitter input end is perpendicular to the transmission paths of the two power splitter output ends, which can ensure that the distributed signal power and phase of the transmission paths of each power splitter output end are equal.

[0063] like Figure 6As shown in the figure, from the S parameter simulation results, it can be seen that in the frequency range of 17GHz~22GHz, the return loss of the power splitter is relatively low. This means that the port matching of the power splitter is high, and the bandwidth can cover the actual use range of 19-20.25GHz. Moreover, the two-way output loss of the power splitter is basically the same, and the signal is evenly distributed.

[0064] The present invention adopts a coplanar waveguide structure as the interface end of the power splitter, so that the power splitter can be easily connected with passive and active devices in the microwave circuit, thereby improving the circuit density. A substrate integrated waveguide structure is adopted as the power splitter body, and the transmission performance of the interface end is improved by using the substrate integrated waveguide structure. The power splitter of the present invention can effectively suppress the generation of parasitic current and reduce the transmission loss of the power splitter; and the shielding effect is excellent, which can effectively reduce the interference of external electromagnetic waves. The power splitter has the advantages of small size, light weight, and low processability.

[0065] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power splitter for synchronization signals of a cascaded millimeter-wave radar system, characterized in that: The power division device comprises three conversion components (1) and a power division unit (2); wherein one conversion component (1) is an input conversion component, and the other two conversion components (1) are output conversion components; The conversion component (1) comprises a first coplanar waveguide structure and a first substrate integrated waveguide structure; the first substrate integrated waveguide structure is arranged outside the first coplanar waveguide structure, and the transmission path of the first substrate integrated waveguide structure in the same conversion component is the same as the transmission path of the first coplanar waveguide structure; The power division part (2) comprises a second substrate integrated waveguide structure, which is divided into a power division input end and two power division output ends; The first substrate integrated waveguide structure of the input conversion component is connected to the power division input end of the power division part (2); and the first substrate integrated waveguide structure of each output conversion component is connected to each power division output end of the power division part (2) in a one-to-one manner.

2. The power division device for synchronization signals of a cascaded millimeter-wave radar system according to claim 1, characterized in that: The input conversion component includes an input part and a first transition part; the input end of the first transition part is connected to the output end of the input part, and the output end of the first transition part is connected to the power division input end of the power division part; The output conversion component includes an output part and a second transition part; the input end of the second transition part is connected to the power division output end of the power division part, and the output end of the second transition part is connected to the input end of the output part.

3. The power division device for synchronization signals of a cascaded millimeter-wave radar system according to claim 1, characterized in that: The power division device comprises an upper metal layer (3), a dielectric layer (4) and a lower metal layer (5); the upper metal layer (3), the dielectric layer (4) and the lower metal layer (5) are stacked in sequence; The first coplanar waveguide structure is arranged on the upper metal layer (3); the first substrate integrated waveguide structure and the second substrate integrated waveguide structure are respectively composed of a plurality of metal holes, each metal hole sequentially passing through the upper metal layer (3), the dielectric layer (4) and the lower metal layer (5).

4. The power division device for synchronization signals of a cascaded millimeter-wave radar system according to claim 2, characterized in that: The input portion comprises a first central band (8) and two parallel first metal perforated bands (6); two parallel first channels (7) are arranged on both sides of the first central band (8); the two first metal perforated bands (6) are respectively arranged on one side of the two first channels (7) away from the first central band (8); the length directions of the first central band (8), the first metal perforated bands (6) and the first channels (7) are parallel; The first central band (8) and the first channel (7) are both arranged on the upper metal layer (3); the metal holes in the first metal hole band (6) sequentially penetrate the upper metal layer (3), the dielectric layer (4) and the lower metal layer (5); and the input end of the first central band (8), one end of the first metal hole band (6) and one end of the first channel (7) are all located at one side edge of the upper metal layer (3).

5. The power division device for synchronization signals of a cascaded millimeter-wave radar system according to claim 4, characterized in that: The first transition portion comprises two symmetrically arranged second channels (9) and two symmetrically arranged second metal perforated bands (10); one end of each second channel (9) is respectively connected to one end of a first channel (7), and the distance between the ends of the two second channels (9) away from the first channel (7) is greater than the width of the first central band (8); one end of each second metal perforated band (10) is connected to one end of a first metal perforated band (6), and the distance between the ends of the two second metal perforated bands (10) away from the first metal perforated band (6) is greater than the distance between parallel holes of the two first metal perforated bands (6); The included angle between the first channel (7) and the second channel (9) is greater than the included angle between the first metal hole band (6) and the second metal hole band (10).

6. The power division device for synchronization signals of a cascaded millimeter-wave radar system according to claim 2, characterized in that: Each of the output parts comprises a second central band (13) and two parallel third metal perforated bands (11); two parallel third channels (12) are arranged on both sides of the second central band (13); the two third metal perforated bands (11) are respectively arranged on a side of the two third channels (12) away from the second central band (13); the length directions of the second central band (13), the third metal perforated bands (11) and the third channels (12) in the same output part (2) are parallel; The second central band (13) and the third channel (12) are both arranged on the upper metal layer (3); the metal holes in the third metal hole band (11) sequentially penetrate the upper metal layer (3), the dielectric layer (4) and the lower metal layer (5); and the output end of the second central band (13), one end of the third metal hole band (11) and one end of the third channel (12) are all located at the other side edge of the upper metal layer (3).

7. The power division device for synchronization signals of a cascaded millimeter wave radar system according to claim 6, characterized in that: Each of the second transition portions comprises two symmetrically arranged fourth channels (14) and two symmetrically arranged fourth metal perforated bands (15); one end of each fourth channel (14) is respectively connected to one end of a third channel (12), and the distance between the ends of the two fourth channels (14) away from the third channel (12) is greater than the width of the second central band (13); one end of each fourth metal perforated band (15) is connected to one end of a third metal perforated band (11), and the distance between the ends of the two fourth metal perforated bands (15) away from the third metal perforated band (11) is greater than the distance between parallel holes of the two third metal perforated bands (11); The included angle between the third channel (12) and the fourth channel (14) is greater than the included angle between the third metal hole band (11) and the fourth metal hole band (15).

8. The power division device for synchronization signals of a cascaded millimeter-wave radar system according to claim 2, characterized in that: The power division input end of the power division part (2) comprises two parallel fifth metal hole belts (16), one end of the two fifth metal hole belts (16) being respectively connected to one end of the two second metal hole belts (10) in the first transition part away from the input part; Each power division output end of the power division part (2) comprises two parallel sixth metal hole strips (17), and one end of the two sixth metal hole strips (17) of each power division output end is respectively connected to one end of two fourth metal hole strips (15) in a second transition part away from the output part.

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