A PCB with a special structure for automotive 77GHz millimeter-wave radar

Abstract

This invention provides a specially structured PCB for a 77GHz millimeter-wave radar used in automobiles. The PCB includes a copper foil metal shielding layer, vias, high-frequency signal lines, grounding protection lines, low-frequency signal lines, power supply lines, and intermediate-frequency signal lines. By classifying and arranging signal transmission lines according to frequency in different areas and employing corresponding line structures and protection measures, this invention effectively reduces crosstalk between different signal lines, improves the accuracy and stability of signal transmission, and thus enhances the radar's detection accuracy. The metal shielding layers covering the top and bottom layers of the PCB, along with the metal shielding frame at the edges, form a robust electromagnetic shielding structure, effectively shielding against external electromagnetic interference and improving the radar board's anti-interference capability in complex electromagnetic environments, ensuring the normal operation of the radar system.

Description

Technical Field

[0001] This utility model belongs to the field of PCB technology, and in particular relates to a PCB with a special structure for use in automotive 77GHz millimeter-wave radar. Background Technology

[0002] Existing automotive 77GHz millimeter-wave radar PCBs have several structural design flaws that affect radar performance and reliability. For example, the signal transmission lines on the PCB are poorly laid out, easily causing crosstalk between different signal lines and leading to errors in radar signal processing; the mixed arrangement of power lines and signal lines makes power supply noise prone to interfering with signal transmission and reducing signal quality; furthermore, the PCB lacks an effective electromagnetic shielding structure, making it susceptible to external electromagnetic interference in complex electromagnetic environments, which can affect the normal operation of the radar board and lead to inaccurate radar detection. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a PCB with a special structure for automotive 77GHz millimeter-wave radar. By optimizing the circuit layout and setting an electromagnetic shielding structure, signal crosstalk and electromagnetic interference are reduced, thereby improving signal transmission quality and the operational stability of the radar board.

[0004] A PCB with a special structure for a 77GHz millimeter-wave radar for automobiles includes a PCB, a copper foil metal shielding layer, vias, high-frequency signal lines, grounding protection lines, low-frequency signal lines, power lines, and intermediate-frequency signal lines. The outer wall of the PCB is integrally formed with a copper foil metal shielding layer; vias are respectively opened at the four corners of the PCB; high-frequency signal lines are arranged at the upper part of the PCB; grounding protection lines are arranged on the outer ring of the upper part of the PCB; low-frequency signal lines and power lines are arranged at the bottom of the PCB; and intermediate-frequency signal lines are arranged in the middle of the PCB.

[0005] Preferably, the high-frequency signal lines are arranged in an area 10mm from the edge of the PCB, using a microstrip line structure with a width of 0.12mm and a line spacing of 0.15mm.

[0006] Preferably, the PCB size is set to 120mm × 80mm; the inner wall of the via is integrally provided with a copper sheet layer.

[0007] Preferably, the width of the grounding protection line is set to 0.08mm and it is connected to the grounding wire of PCB1 through a copper sheet set on the inner wall of the via.

[0008] Preferably, the power line is a 0.5mm wide line; and an epoxy resin insulating strip with a width of 0.3mm is provided between the power line and the low-frequency signal line.

[0009] Preferably, the top and bottom surfaces of the PCB are covered with a copper foil metal shielding layer with a thickness of 0.03 mm, and the metal shielding layer is connected to the ground layer of PCB1 through vias.

[0010] Preferably, the diameter of the via is set to 0.3 mm.

[0011] Preferably, a stainless steel metal shielding frame with a thickness of 0.2mm and a height of 1mm is installed around the edge of the PCB, and the copper foil metal shielding layer is fixedly connected to the metal shielding frame by soldering.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. In this utility model, by classifying and arranging signal transmission lines according to frequency in different areas and adopting corresponding line structures and protection measures, crosstalk between different signal lines is effectively reduced, the accuracy and stability of signal transmission are improved, thereby enhancing the radar's detection accuracy of target objects.

[0014] 2. In this utility model, by setting an isolation strip between the power supply line and the low-frequency signal line, the interference of power supply noise on the low-frequency signal is prevented, the quality of the low-frequency signal is guaranteed, and the stable operation of the radar board is facilitated.

[0015] 3. In this utility model, a good electromagnetic shielding structure is formed by the metal shielding layer covering the top and bottom layers of the PCB and the metal shielding frame at the edge. This structure can effectively shield external electromagnetic interference, improve the anti-interference capability of the radar board in complex electromagnetic environments, and ensure the normal operation of the radar system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0018] In the picture:

[0019] 1. PCB; 2. Copper foil metal shielding layer; 3. Via; 4. High-frequency signal lines; 5. Grounding protection lines; 6. Low-frequency signal lines; 7. Power supply lines; 8. Intermediate-frequency signal lines. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings, as shown below. Figure 1 and attached Figure 2 As shown, a PCB with a special structure for a 77GHz millimeter-wave radar for automobiles includes a PCB1, a copper foil metal shielding layer 2, vias 3, a high-frequency signal line 4, a grounding protection line 5, a low-frequency signal line 6, a power supply line 7, and an intermediate-frequency signal line 8. The outer wall of the PCB1 is integrally provided with the copper foil metal shielding layer 2; vias 3 are respectively opened at the four corners of the PCB1; the high-frequency signal line 4 is provided at the upper inner end of the PCB1; the grounding protection line 5 is provided at the outer ring of the upper inner end of the PCB1; the low-frequency signal line 6 and the power supply line 7 are provided at the bottom inner end of the PCB1; and the intermediate-frequency signal line 8 is provided at the middle position of the PCB1.

[0021] In this embodiment, specifically, the high-frequency signal line 4 is arranged in an area 10mm away from the edge of PCB1, and adopts a microstrip line structure with a width of 0.12mm.

[0022] In this embodiment, specifically, the size of the PCB1 is set to 120mm × 80mm; the inner wall of the via 3 is integrally provided with a copper sheet layer.

[0023] In this embodiment, specifically, the width of the grounding protection line 5 is set to 0.08mm and it is connected to the grounding wire of PCB1 through the copper sheet set on the inner wall of the via 3.

[0024] In this embodiment, specifically, the power line 7 is set to a width of 0.5mm; and an epoxy resin insulating strip with a width of 0.3mm is provided between the power line 7 and the low-frequency signal line 6.

[0025] In this embodiment, specifically, the top and bottom surfaces of PCB1 are covered with a copper foil metal shielding layer with a thickness of 0.03mm, and the metal shielding layer is connected to the ground layer of PCB1 through via 3.

[0026] In this embodiment, specifically, a stainless steel metal shielding frame with a thickness of 0.2mm and a height of 1mm is installed around the edge of the PCB1, and the copper foil metal shielding layer 2 is fixedly connected to the metal shielding frame by soldering.

Claims

1. A PCB with a special structure for use in automotive 77GHz millimeter-wave radar, characterized in that, The PCB with a special structure for a 77GHz millimeter-wave radar for automobiles includes a PCB (1), a copper foil metal shielding layer (2), vias (3), a high-frequency signal line (4), a grounding protection line (5), a low-frequency signal line (6), a power supply line (7), and an intermediate-frequency signal line (8). The outer wall of the PCB (1) is integrally provided with a copper foil metal shielding layer (2). The four corners of the PCB (1) are respectively provided with vias (3). The upper part of the PCB (1) is provided with a high-frequency signal line (4). The outer ring of the upper part of the PCB (1) is provided with a grounding protection line (5). The bottom part of the PCB (1) is provided with a low-frequency signal line (6) and a power supply line (7). The middle part of the PCB (1) is provided with an intermediate-frequency signal line (8).

2. The PCB with a special structure for automotive 77GHz millimeter-wave radar as described in claim 1, characterized in that, The high-frequency signal line (4) is arranged in an area 10mm away from the edge of PCB1, and adopts a microstrip line structure with a width of 0.12mm and a line spacing of 0.15mm.

3. The PCB with a special structure for automotive 77GHz millimeter-wave radar as described in claim 1, characterized in that, The PCB (1) is 120mm×80mm in size; the inner wall of the via (3) is integrally provided with a copper sheet layer.

4. The PCB with a special structure for automotive 77GHz millimeter-wave radar as described in claim 1, characterized in that, The grounding protection line (5) is set to a width of 0.08 mm and is connected to the grounding line of PCB1 through a copper sheet set on the inner wall of the via (3).

5. The PCB with a special structure for automotive 77GHz millimeter-wave radar as described in claim 2, characterized in that, The power line (7) is set to a width of 0.5 mm; an epoxy resin insulating strip with a width of 0.3 mm is provided between the power line (7) and the low frequency signal line (6).

6. The PCB with a special structure for automotive 77GHz millimeter-wave radar as described in claim 1, characterized in that, The top and bottom surfaces of the PCB (1) are covered with a copper foil metal shielding layer with a thickness of 0.03 mm, and the metal shielding layer is connected to the ground layer of the PCB1 through a via (3).

7. The PCB with a special structure for automotive 77GHz millimeter-wave radar as described in claim 2, characterized in that, A stainless steel metal shielding frame with a thickness of 0.2 mm and a height of 1 mm is installed around the edge of the PCB (1), and the copper foil metal shielding layer (2) is fixedly connected to the metal shielding frame by soldering.

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