Radar sensor having hollow waveguide structure
A radar sensor. The radar sensor has a hollow waveguide structure and a high-frequency module, which are arranged on opposite sides of a printed circuit board, and has a coupling device for transmitting microwave signals between the high-frequency module and the hollow waveguide structure, the coupling device having a dielectric waveguide manufactured separately from the printed circuit board.
1 . A radar sensor, comprising:
a hollow waveguide structure and a high-frequency module, which are arranged on opposite sides of a printed circuit board relative to one another; and
a coupling device configured to transmit microwave signals between the high-frequency module and the hollow waveguide structure, wherein the coupling device has a dielectric waveguide manufactured separately from the printed circuit board,
wherein the ends of the dielectric waveguide are shaped to match corresponding coupling points of the hollow waveguide structure and the high-frequency module.
2 . The radar sensor as recited in claim 1 , wherein the dielectric waveguide extends through a drill hole of the printed circuit board.
3 . The radar sensor as recited in claim 2 , wherein the dielectric waveguide is held in the drill hole of the printed circuit board in such a way that its entire perimeter is held at a distance from an inner wall of the drill hole.
4 . The radar sensor as recited in claim 2 , wherein the dielectric waveguide is fixed in the drill hole by clamping elements.
5 . The radar sensor as recited in claim 4 , wherein the clamping elements are connected to the waveguide by way of resilient webs and are biased in a clamping manner against a peripheral surface of the drill hole.
6 . The radar sensor as recited in claim 2 , wherein the dielectric waveguide passes through the drill hole of the printed circuit board and, on a side of the printed circuit board on which the hollow waveguide structure is arranged, has a section which projects out of the drill hole and bridges a gap between the drill hole and a coupling point of the hollow waveguide structure.
7 . The radar sensor as recited in claim 6 , wherein the section of the dielectric waveguide that projects out of the drill hole is bent or curved.
8 . The radar sensor as recited in claim 1 , wherein the high-frequency module has a housing, which is fixed to and in contact with the printed circuit board by way of solder balls, and in which a solder ball of the solder balls forms a coupling site for coupling to the dielectric waveguide, one end of which is positioned opposite the solder ball.
9 . The radar sensor as recited in claim 1 , wherein the high-frequency module has an integrated coupling point for coupling to the dielectric waveguide, and one end of the waveguide is positioned opposite the integrated coupling point.
10 . The radar sensor as recited in claim 9 , wherein the coupling point is located in a part of the high-frequency module facing the printed circuit board.
11 . The radar sensor as recited in claim 9 , wherein the coupling point is located in a lateral surface of the high-frequency module extending at right angles to a plane of the printed circuit board.
12 . The radar sensor as recited in claim 9 , wherein the coupling point is located in a top surface of the high-frequency module facing away from the printed circuit board.