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1. WO2020115220 - DISPOSITIF DE LENTILLE À MICRO-ONDES AUTOMOBILE POUR LA GÉNÉRATION D'UN DIAGRAMME DE RAYONNEMENT EN FORME DE COEUR DANS DES APPLICATIONS DE DÉTECTION AUTOMOBILE INTÉRIEURE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

Claims

1. A dielectric lens device (14; 40) for shaping a radar beam, used in particular in interior automotive radar sensing applications, comprising

- a first plano-convex cylindrical dielectric lens member (16; 42) and a second plano-convex cylindrical dielectric lens member (20; 52),

- a plane-parallel dielectric substrate (24),

wherein

- the two plano-convex cylindrical dielectric lens members (16, 20; 42, 52) are arranged with their plane surfaces towards a same surface of the plane- parallel dielectric substrate (24), and

- the plano-convex cylindrical dielectric lens members (16, 20; 42, 52) are interconnected to the plane-parallel dielectric substrate (24) in a material fit.

2. The dielectric lens device (14) as claimed in claim 1 , wherein a first height (h-i) of the first plano-convex cylindrical dielectric lens member (16) and a second height (h2) of the second plano-convex cylindrical dielectric lens member (20), measured in a direction that is perpendicular to the surface of the plane- parallel dielectric substrate (24), are substantially equal.

3. The dielectric lens device (14) as claimed in claim 1 or 2, wherein the first (16) and the second plano-convex cylindrical dielectric lens member (20) are arranged in a spaced manner.

4. The dielectric lens device (14) as claimed in any one of claims 1 to 3, wherein at least one out of the convex surface (18) of the first plano-convex cylindrical dielectric lens member (16) and the convex surface (22) of the second plano convex cylindrical dielectric lens member (20) is shaped as a portion of an elliptical cylinder surface.

5. The dielectric lens device (14) as claimed in any one of claims 1 to 3, wherein at least one of the convex surface (18) of the first plano-convex cylindrical dielectric lens member (16) and the convex surface (22) of the second plano convex cylindrical dielectric lens member (20) is shaped as a portion of a parabolic cylinder surface.

6. The dielectric lens device (40) as claimed in any one of the preceding claims, wherein at least one of the convex surface (44, 54) of the first plano-convex cylindrical dielectric lens member (42) and the convex surface (54) of the second plano-convex cylindrical dielectric lens member (52) is shaped as a portion of a cylinder having a direction of extension that is curved.

7. The dielectric lens device (14) as claimed in any one of the preceding claims, wherein at least one out of a first width (w-i) of the first plano-convex cylindrical dielectric lens member and a second width (w2) of the second plano-convex cylindrical dielectric lens member (20) is at least twice as large as the respective height (h-i, h2) of the plano-convex cylindrical dielectric lens member (16, 20), wherein the widths (w-i, w2) are measured in a direction (30) parallel to the surface of the plane-parallel dielectric substrate (24) and perpendicular to a direction of extension (28) of the respective plano-convex cylindrical dielectric lens member (16, 20).

8. The dielectric lens device (14) as claimed in any one of the preceding claims, wherein the plano-convex cylindrical dielectric lens members (16, 20) and the plane-parallel dielectric substrate (24) are for the most part made from a thermoplastic polymer and are formed as a single unitary piece.

9. A radar device (10) for interior automotive radar sensing applications, comprising

- a dielectric lens device (14; 40) as claimed in any one of the preceding claims, and

- at least one radar antenna member (12),

wherein

- the at least one radar antenna member (12) is arranged in a spaced manner to face a surface of the plane-parallel dielectric substrate (24) opposite of the two plano-convex cylindrical dielectric lens members (16, 20; 42, 52), and

- the at least one radar antenna member (12) is arranged such that a direction of its strongest power emission runs perpendicular to the surface of the plane-parallel dielectric substrate (24).

10. The radar device (10) as claimed in claim 9, wherein the at least one radar antenna member (12) is arranged on a center line (26) of the dielectric lens device (14) that is arranged perpendicular to the surface of the plane-parallel dielectric substrate (24) and that is equally spaced to the two plano-convex cylindrical dielectric lens members (16, 20).

11. The radar device (10) as claimed in claim 9 or 10, wherein a size (m) of a spacing between the two plano-convex cylindrical dielectric lens members (26, 20) on the plane-parallel dielectric substrate (24) and sizes of their heights (h-i, h2) are selected such that a ratio of a radar power magnitude of a local minimum that is located between two maxima of a radar power magnitude in a transmitted radiation pattern to one of the maxima of radar power magnitude in the transmitted radiation pattern lies between 2.0 and 4.0.

12. The radar device (10) as claimed in any one of claims 9 to 11 , wherein the at least one radar antenna member (12) has a Gaussian-type main lobe, and wherein the dielectric lens device (14; 40) is configured for being arranged behind a vehicle headliner as an operating location.