Radar apparatus provided with radome

Patent metadata

Field	Value
Publication number	US-9502760-B2
Application number	US-201314407809-A
Country	US
Kind code	B2
Filing date	Jun 6, 2013
Priority date	Jun 14, 2012
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

An antenna section is housed in a housing space which is defined by a radome and a housing, and provided with a transmitting antenna that transmits radar waves composed of radio waves of a predetermined frequency and a receiving antenna that receives the radar waves. The radome has a transmission section that is a portion transmitting the radar waves and an attenuation section that is a portion attenuating the radar waves. The attenuation section includes a first attenuation layer formed of a material for attenuating the radar waves. The first attenuation layer has a thickness that is 2n−1 times (n is a natural number) of one-quarter of a wavelength of the radar waves in the first attenuation layer.

First claim

What is claimed is:

1. A radar apparatus comprising:
an antenna that performs at least one of transmission and reception of radar waves composed of radio waves of a predetermined frequency; and
a radome having a transmission section that is a portion transmitting the radar waves therethrough and an attenuation section that is a portion attenuating the radar waves, wherein
the attenuation section at least includes a first attenuation layer formed of a material that attenuates the radar waves, a second attenuation layer stacked onto the first attenuation layer and formed of a material having a dielectric constant that is different from that of the first attenuation layer and a third attenuation layer formed to sandwich the second attenuation layer between the first attenuation layer and the third attenuation layer;
the first attenuation layer has a thickness that is 2n−1 times (n is a natural number) of one-quarter of a wavelength of the radar waves in the first attenuation layer;
the second attenuation layer is formed of the same material as that forming the transmission section; and
the third attenuation layer is formed of the same material as the material forming the first attenuation layer.

2. The radar apparatus according to claim 1 , wherein the second attenuation layer has a thickness that is 2n−1 times (n is a natural number) of one-quarter of a wavelength of the radar waves in the second attenuation layer.

3. The radar apparatus according to claim 1 , wherein the radome has the transmission section that is a portion on which an aperture plane of the antenna is projected in a normal direction relative to the antenna-aperture plane, with the attenuation section being formed around the transmission section.

4. The radar apparatus according to claim 1 , wherein the radar apparatus is installed in a vehicle.

Assignees

• Denso Corp

Inventors

• Fujita Akihisa
• Hoshino Koichi

Classifications

• H01Q9/0407

  Substantially flat resonant element parallel to ground plane, e.g. patch antenna (dipole H01Q9/285; monopole H01Q9/40) · CPC title

• G01S2007/027

  Physics · mapped topic

• G01S13/931

  of land vehicles · CPC title

• G01S7/03

  Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver · CPC title

• H01Q1/42

  Housings not intimately mechanically associated with radiating elements, e.g. radome · CPC title