Vehicle assembly comprising a radar sensor and a set of layers
AssigneeValeo Vision
InventorsPierre Renaud, Pierre Albou
Life of this patent
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Abstract
The invention relates to a vehicle assembly for a vehicle, with the vehicle assembly including a radar sensor configured to transmit/receive radar waves. The radar sensor being placed facing a layer assembly. The layer assembly includes at least two dielectric layers, these dielectric layers including a primary layer and a secondary layer separated by a layer of air. The layer of air has a thickness equal to (m3×(λ/2))/cos(θ3), with θ3 an angle of incidence of exiting reflected waves striking the secondary layer and m3=1, . . . to N, N being an integer, the exiting reflected waves deriving from radar waves transmitted by the radar sensor.
Claims10
A vehicle assembly for a vehicle, the vehicle assembly comprising:
- a radar sensor configured to transmit or receive a number of radar waves, the radar sensor being placed facing a layer assembly, and
- the layer assembly, which includes at least two dielectric layers, said dielectric layers including primary layers and secondary layers where each primary layer and each secondary layer is separated by a layer of air;
- wherein the layer of air has a thickness equal to ((m3+ε)×(λ/2))/cos (θ3), where λ is a wavelength, where ε includes a value between −0.25 and +0.25, where θ3 represents an averaged angle of incidence from a plurality of exiting reflected waves striking the secondary layer;
- and
- where m3 is defined by a number selected in a range from 1 to N, N being a positive integer, said exiting reflected waves derived from each associated radar waves transmitted by the radar sensor;
- wherein the primary layer has a thickness equal to (λ/(2×n1×cos β1))+(m1×λ), where β1 is a refracted angle corresponding to an angle of incidence θ1 of each transmitted radar wave and where n1 is a refractive index of the primary layer and m1 is an integer selected from 1 to N;
- and
- wherein the thickness of the primary layer is defined by the angle of incidence θ1 equal to arctan (d1/(2e4)), where d1 is a distance between a transmitter antenna and a receiver antenna, and where e4 is a distance between the radar sensor and the primary layer.
A layer assembly for a vehicle, the layer assembly configured to be placed facing a radar sensor and configured to transmit or receive radar waves, comprising:
- at least two dielectric layers, said dielectric layers including primary layers and secondary layers where each primary layer and each secondary layer is separated by a layer of air;
- wherein the layer of air has a thickness equal to (m3×(λ/2))/cos(θ3), where λ is a wavelength, wherein θ3 is an averaged angle of incidence from a number of exiting reflected waves striking the secondary layer, where m3 is defined by a number selected in a range from 1 to N, N being a positive integer, said exiting reflected waves derived from each associated radar waves transmitted by the radar sensor;
- wherein the primary layer has a thickness equal to (λ/(2×n1×cosβ1))+(m1×λ), where β1 is a refracted angle corresponding to an angle of incidence θ1 of each transmitted radar wave and where n1 is a refractive index of the primary layer and m1 is an integer selected from 1 to N;
- and
- wherein the thickness of the primary layer is defined by the angle of incidence θ1 equal to arctan (d1/(2e4)), where d1 is a distance between a transmitter antenna and a receiver antenna, and where e4 is a distance between the radar sensor and the primary layer.
Dependencies are inferred from the claim text.