US 12,228,676 B2
Radar apparatus
Ryosuke Shiozaki, Tokyo (JP); Ken Takahashi, Ishikawa (JP); and Noriaki Saito, Tokyo (JP)
Assigned to Panasonic Automotive Systems Co., Ltd., Kanagawa (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Feb. 2, 2022, as Appl. No. 17/591,488.
Application 17/591,488 is a continuation of application No. PCT/JP2020/024669, filed on Jun. 23, 2020.
Claims priority of application No. 2019-143752 (JP), filed on Aug. 5, 2019.
Prior Publication US 2024/0310477 A1, Sep. 19, 2024
Int. Cl. G01S 7/03 (2006.01); G01S 7/02 (2006.01); G01S 13/931 (2020.01); H01Q 1/32 (2006.01)
CPC G01S 7/032 (2013.01) [G01S 7/027 (2021.05); G01S 13/931 (2013.01); H01Q 1/3233 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A radar apparatus, comprising:
a circuit board including a board surface provided with an antenna module for transmitting an electromagnetic wave;
a housing accommodating the circuit board and including a facing wall facing the board surface; and
a heat transfer module transferring heat generated inside the housing to the housing, wherein
the facing wall includes:
a transmission portion transmitting therethrough the electromagnetic wave transmitted from the antenna module, the transmission portion having a first thickness corresponding to a wavelength of the electromagnetic wave transmitted from the antenna module; and
an absorption portion having a second thickness different from the first a thickness of the transmission portion, the second thickness corresponding to an effective wavelength of the electromagnetic wave, and the absorption portion is configured to reabsorb a re-incident electromagnetic wave reflected from an object outside the housing which is re-incident on the housing, the absorption portion being made of a same material as the transmitting portion, and wherein
the absorption portion absorbs the electromagnetic wave by reverse-phase synthesis of:
a first electromagnetic wave resulting from reflection of the re-incident electromagnetic wave at a first surface of the absorption portion, and
a second electromagnetic wave resulting from reflection of the re-incident electromagnetic wave at a second surface different from the first surface.