Compound circuit board and radar device
A compound circuit board for a radar device includes a first substrate including a plurality of trace layers having a first trace layer formed with a digital signal processing unit and an electronic control unit in a first area, a second substrate including a plurality of trace layers having a second trace layer formed with an antenna module in a second area, and a prepreg layer between the first and second substrates for connecting the first and second substrates, wherein the first area and the second area in a first projecting result generated by projecting the first trace layer on the second trace layer are substantially overlapped.
1. A compound circuit board for a radar device, comprising:
a first substrate, comprising a plurality of trace layers having a first trace layer formed with a digital signal processing unit and an electronic control unit in a first area;
a second substrate, comprising a plurality of trace layers having a second trace layer formed with an antenna module in a second area; and
a prepreg layer, between the first substrate and the second substrate for connecting the first and second substrates;
wherein the first area and the second area in a first projecting result generated by projecting the first trace layer on the second trace layer are substantially overlapped.
2. The compound circuit board of claim 1 , wherein the first trace layer is formed with an analog-to-digital converter and an analog intermediate-frequency amplifier in a third area, the second trace layer is formed with a radio-frequency processing chip and a passive circuit module in a fourth area, and the third area and the fourth area in the first projecting result are substantially overlapped.
3. The compound circuit board of claim 2 , wherein a third trace layer in the first substrate is formed with a first power supply module in a fifth area and a second power supply module in a sixth area, the fifth area and the second area in a second projecting result generated by projecting the third trace layer on the second trace layer are substantially overlapped, and the sixth area and the fourth area in the second projecting result are substantially overlapped.
4. The compound circuit board of claim 1 , wherein a thickness of the prepreg layer is between 5 mils and 10 mils.
5. The compound circuit board of claim 1 , wherein projecting areas of the first substrate and the second substrate are substantially the same.
6. The compound circuit board of claim 5 , wherein a cross-section thickness of the compound circuit board is smaller than 5 mm.
7. The compound circuit board of claim 1 , wherein the first substrate conforms to an FR4 substrate specification.
8. The compound circuit board of claim 1 , wherein the radar device is a wireless signal transceiver of an automotive radar system.
9. A radar device, comprising:
a base;
a compound circuit board, disposed on the base, comprising:
a first substrate, comprising a plurality of trace layers having a first trace layer formed with a digital signal processing unit and an electronic control unit in a first area;
a second substrate, comprising a plurality of trace layers having a second trace layer formed with an antenna module in a second area; and
a prepreg layer, between the first substrate and the second substrate for connecting the first and second substrates;
a metal shielding cover, disposed on the compound circuit board, wherein a coverage of the metal shielding cover in relation to the compound circuit board does not include the second area;
wherein the first area and the second area in a first projecting result generated by projecting the first trace layer on the second trace layer are substantially overlapped.
10. The radar device of claim 9 , wherein the first trace layer is formed with an analog-to-digital converter and an analog IF amplifier in a third area, the second trace layer is formed with an RF processing chip and a passive circuit module in a fourth area, and the third area and the fourth area in the first projecting result are substantially overlapped.
11. The radar device of claim 10 , wherein a third trace layer in the first substrate is formed with a first power supply module in a fifth area and a second power supply module in a sixth area, the fifth area and the second area in a second projecting result generated by projecting the third trace layer on the second trace layer are substantially overlapped, and the sixth area and the fourth area in the second projecting result are substantially overlapped.
12. The radar device of claim 9 , wherein a thickness of the prepreg layer is between 5 mils and 10 mils.
13. The radar device of claim 9 , wherein projecting areas of the first substrate and the second substrate are substantially the same.
14. The radar device of claim 13 , wherein a section thickness of the compound circuit board is smaller than 5 mm.
15. The radar device of claim 9 , wherein the first substrate conforms to an FR4 substrate specification.
16. The radar device of claim 9 , wherein the radar device is a wireless signal transceiver of an automotive radar system.
17. The radar device of claim 9 , further comprising a radome for combining with the base to enclosing the compound circuit board and the metal shielding cover.