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Radar sensors for motor vehicles

  • US 7,630,061 B2
  • Filed: 07/26/2005
  • Issued: 12/08/2009
  • Est. Priority Date: 08/05/2004
  • Status: Expired due to Fees
First Claim
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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.

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