Patent ID: 7630061
Filing Date: 2009-12-08
Classification: B60W,G01S,G08G,H01Q

Abstract:
1. A radar sensor for a motor vehicle comprising: a radar antenna element; and an optical system for subdividing a radar beam generated by the antenna element into a plurality of radar beam components that are radiated in different directions, the optical system having a diffraction grating, wherein the diffraction grating is a transmission grating, and wherein the optical system includes a plano-convex lens, the diffraction grating being integrated on the planar surface of the plano-convex lens, and wherein the radar beam components that are radiated in different directions exit the plano-convex lens from the convex surface of the plano-convex lens, and wherein the diffraction grating is made up of an elastic diaphragm having a sequence of grating strips, and a grating constant of the diffraction grating may be varied by applying a variable force to the elastic diaphragm.