Abstract
A radar sensor that includes a circuit board, a waveguide structure having at least one waveguide channel, and at least one pin that is pressed into the circuit board. The pin connects the circuit board to the at least one waveguide channel of the waveguide structure in such a way that radar signals may be coupled into the at least one waveguide channel and/or decoupled from the at least one waveguide channel.
Claims
1. A radar sensor, comprising: a circuit board; a waveguide structure having at least one waveguide channel; at least one pin which is pressed into the circuit board and which connects the circuit board with the at least one waveguide channel of the waveguide structure in such a way that radar signals may be coupled into the at least one waveguide channel and/or decoupled from the at least one waveguide channel.
2. The radar sensor as recited in claim 1, wherein a position and a shape of the at least one pin is adapted to the at least one waveguide channel.
3. The radar sensor as recited in claim 1, wherein the at least one waveguide antenna is connected via the at least one waveguide channel.
4. The radar sensor as recited in claim 1, wherein the at least one waveguide antenna is formed in the waveguide structure.
5. A method for manufacturing a radar sensor, comprising the following steps: providing a circuit board; providing a waveguide structure; forming at least one waveguide channel in the waveguide structure; pressing at least one pin into the circuit board, whose position and shape are adapted to the at least one waveguide channel; and bringing together the waveguide structure and the circuit board, so that the at least one pin connects the circuit board with the at least one waveguide channel.
6. The method as recited in claim 5, wherein the at least one pin is pressed into the circuit board perpendicularly to the circuit board.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Exemplary embodiments of the present invention are illustrated in the figures and explained in greater detail in the description below.
[0014] FIG. 1 shows an isometric view of a waveguide structure of a radar sensor according to an example embodiment of the present invention.
[0015] FIG. 2 shows a sectional view of a circuit board of a radar sensor according to an example embodiment of the present invention.
[0016] FIG. 3 shows a view of a surface of the circuit board, in accordance with an example embodiment of the present invention.
[0017] FIG. 4 shows an isometric sectional view through a radar sensor according to one specific example embodiment of the present invention.
[0018] FIG. 5 shows a sectional view through the radar sensor according to an example embodiment of the present invention.
[0019] FIG. 6 shows a top view of the radar sensor according to an example embodiment of the present invention.
DETAILED DESCRIPTION OF EXAMPLE EMBODIMENTS
[0020] FIG. 1 shows an isometric view of a waveguide structure in the form of a distributor plate 1. In distributor plate 1, waveguide channels 10 are designed that are used to guide a radar signal. Distributor plate 1 is made of metal-plated plastic. Waveguide channels 10 have metal-plated side walls. In this exemplary embodiment, two groups made of four waveguide channels 10 each, i.e., eight waveguide channels 10 overall, are formed. The number, the position, the orientation, and the shape of the waveguide channels may vary and be adapted to the usage conditions. In this exemplary embodiment, waveguide channels 10 have the same cross section. Waveguide channels 10 are open on one side and have an opening 11 on the other side.
[0021] FIG. 2 shows a sectional view of a circuit board 2 and FIG. 3 shows a view of a surface O of circuit board 2. Circuit board 2 has strip lines 20 on surface O. Multiple pins 3 are pressed into circuit board 2, only two of which are visible in the present case. A single pin insertion method is used to press in pins 3. Pins 3 stand perpendicularly to surface O of circuit board 2 and protrude from surface O. Optionally, pins 3 that protrude too far from surface O are shortened. Every pin 3 is contacted via a separate strip line 20. Furthermore, a transceiver 4 is situated as an integrated circuit (IC) on a side opposite surface O on circuit board 2. Transceiver 4 is configured to provide a radar signal that is intended to be emitted and to process a radar signal that is received. Transceiver 4 is connected to strip lines 20, for example with the aid of a through-connection (not illustrated).
[0022] To manufacture the radar sensor, distributor plate 1 is brought together with circuit board 2. Distributor plate 1 is plugged onto circuit board 2 with the downward open side of waveguide channels 10, i.e., the side illustrated in FIG. 1. Pins 3 have a position and a shape that is adapted to waveguide channels 10 in each case. To determine the position and the shape of waveguide channels 10 and pins 3, a three-dimensional field simulation may be used, for example. In this exemplary embodiment, pins 3 have the same shape and size and waveguide channels 10 have the same cross section, namely a square cross section. Every pin 3 has a head that has a square cross section and a side length that matches the transverse length of waveguide channels 10 in each case. The position of pins 3 is selected in such a way that they engage with a point of contact of hollow wavelength channels 10 in each case, when distributor plate 1 and circuit board 2 are brought together. Since pins 3 are oriented perpendicularly to surface O, distributor plate 1 is put on circuit board 2 in a direction perpendicular to surface O, along an imagined straight line. Finally, distributor plate 1 and circuit board 2 are connected to one another.
[0023] FIG. 4 shows a sectional isometric view through a radar sensor according to one specific embodiment of the present invention. FIG. 5 shows a view of the section from FIG. 4. FIG. 6 shows a top view of the radar sensor. Distributor plate 1 is connected to circuit board 2. A pin 3 protruding from surface O of circuit board 2 in each case extends in a waveguide channel 10 formed in distributor plate 1. Each waveguide channel 10 is thus connected to circuit board 2. Waveguide channels 10 have openings 11 on the top side of distributor plate 1, which is opposite circuit board 2. Eight openings 11 are provided in this exemplary embodiment (see FIG. 6). The number and position of openings 11 may vary and be adapted to the usage conditions. Further openings, which are not shown here, may also be designed at the other sides of circuit board 2. Waveguide antennas, which are not shown here, are coupled into openings 11 of distributor plate 1. The waveguide antennas may also be directly designed in distributor plate 1 at openings 11. A radar signal is generated by transceiver 4, guided via strip line 20 in circuit board 2 to corresponding pin 3, coupled via pin 3 in waveguide channel 10 of distributor plate 1 and supplied through waveguide channel 10 (and through opening 11) to the waveguide antenna, where, at the desired directional characteristic, it is finally emitted. A radar signal reflected from an external object is received by the waveguide antenna, guided through waveguide channel 10 of distributor plate 1 to pin 3, decoupled via pin 3 from waveguide channel 10, supplied to strip line 20 of circuit board 2 and guided via strip line 20 to transceiver 4. The emitted and received radar signals may use the same paths and pins 3 depending on the usage conditions or use separate paths and pins 3 in each case.
