Radar side-shield and a radar transceiver assembly

1. A side-shield for a radar transceiver, the side-shield comprising:

a non-uniform delay structure comprising:

a first dielectric material; and

a plurality of embedded portions of at least one second dielectric material of different dielectric constant than the first dielectric material, each of the plurality of embedded portions being surrounded by, and thus physically separated by, the first dielectric material;

the non-uniform delay structure being configured to have a radar signal propagate therethrough and to delay the radar signal propagating through the non-uniform delay structure by a variable amount in dependence of a wavelength of the radar signal and in dependence of a location on the non-uniform delay structure through which the radar signal propagates, to thereby diffuse the radar signal by phase randomization due to propagation through the non-uniform delay structure.

2. The side-shield according to claim 1 , wherein the non-uniform delay structure has a variable thickness measured along a normal vector of a surface of the side-shield or a non-uniform dielectric constant measured along the normal vector.

3. The side-shield according to claim 1 , wherein the non-uniform delay structure comprises a carrier structure and a plurality of protruding portions, wherein each of the protruding portions are configured to delay the radar signal propagating through the side-shield by a respective and variable amount in dependence of the wavelength of the radar signal, thereby randomizing a phase distribution of the radar signal after propagation through the side-shield.

4. The side-shield according to claim 3 , wherein the protruding portions and the carrier structure are integrally formed in a plastic material.

5. The side-shield according to claim 3 , wherein the protruding portions are attached to the carrier portion by any of; an adhesive layer, a snap-fit mechanism, an interference fit mechanism, or by ultrasonic welding.

6. The side-shield according to claim 3 , wherein each of the plurality of protruding portions is associated with a height in a range from 0 to H millimeter (mm), measured from the carrier structure in an extension direction of the protruding portion, wherein the height H depends on a radar transmission wavelength in vacuum λ 0 and a dielectric constant ε of a material in the protruding portion.

7. The side-shield according to claim 6 , wherein the height H is given by

H

=

λ

0

2

⁢

(

ε

-

1

)

.

8. The side-shield according to claim 6 , wherein the height H is in a range 2-4 mm.

9. The side-shield according to claim 3 , wherein at least one of the plurality of protruding portions is one or more of a pyramid-shaped protruding portion, a cuboid-shaped protruding portion, an irregular or piecewise linear trench, or a polygon-shaped protruding portion.

10. The side-shield according to claim 3 , wherein one or more of the protruding portions are within a part of a surface of the carrier structure.

11. The side-shield according to claim 1 , wherein the non-uniform delay structure is configured to have the radar signal enter a first surface of the non-uniform delay structure, propagate through the non-uniform delay structure, and exit a second surface of the non-uniform delay structure, wherein at least the first surface of the non-uniform delay structure has a non-uniform, non-repetitive cross-sectional shape.

12. The side-shield according to claim 11 , wherein both the first surface and the second surface of the non-uniform delay structure have non-uniform, non-repetitive cross-sectional shapes.

13. The side-shield according to claim 11 , wherein the non-uniform delay structure has a generally wedge-shaped cross-section, with a first thickness at a first end of the cross-section being smaller than a second thickness at a second end of the cross-section, wherein the radar signal, in addition to being diffused by propagation through the non-uniform delay structure, is directed away from a propagation path between the side-shield and a receiver of the radar transceiver.

14. The side-shield according to claim 1 , wherein at least two of the plurality of embedded portions have at least one of different sizes relative to each other and different shapes relative to each other.

15. A radar transceiver assembly including a radar transceiver and a side-shield according to claim 1 .

16. A vehicle including the radar transceiver assembly according to claim 15 .