US 12,249,759 B2
Radome for vehicle-mounted radar device, and vehicle-mounted radar structure
Takamasa Enomoto, Tokyo (JP); Hiroyuki Kobayashi, Tokyo (JP); Ryuho Ikemasu, Tokyo (JP); and Shinpei Yamamoto, Tokyo (JP)
Assigned to SANKEI GIKEN KOGYO CO., LTD., Tokyo (JP)
Appl. No. 18/021,235
Filed by SANKEI GIKEN KOGYO CO., LTD., Tokyo (JP)
PCT Filed Jun. 23, 2021, PCT No. PCT/JP2021/023881
§ 371(c)(1), (2) Date Feb. 14, 2023,
PCT Pub. No. WO2022/038892, PCT Pub. Date Feb. 24, 2022.
Claims priority of application No. 2020-137956 (JP), filed on Aug. 18, 2020.
Prior Publication US 2023/0299472 A1, Sep. 21, 2023
Int. Cl. H01Q 1/32 (2006.01); H01Q 1/02 (2006.01); H01Q 1/42 (2006.01)
CPC H01Q 1/32 (2013.01) [H01Q 1/02 (2013.01); H01Q 1/42 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A radome for vehicle-mounted radar devices, comprising:
a base body having an electromagnetic wave permeable substrate and a heater wire laminated on an inner surface side of the substrate and wired in a surface direction of the substrate, the substrate being disposed in front of a vehicle-mounted radar device arranged on a center side of a vehicle and the inner surface side of the substrate being the center side of the vehicle, wherein
linear portions of the heater wire are arranged side by side at intervals in the surface direction of the substrate in an electromagnetic wave irradiation region of the substrate, and
a surface occupancy ratio of the linear portions of the heater wire in the electromagnetic wave irradiation region of the substrate is set to 1% or more and 24% or less,
wherein
the radome further comprises a heater sheet including the heater wire and an electromagnetic wave permeable insulating film,
the heater sheet is laminated on and fixed to the inner surface side of the substrate such that the heater wire is placed,
a refractive index defined based on complex permittivity of the insulating film matches the refractive index defined based on complex permittivity of the substrate, or a refractive index defined based on complex permittivity of the insulating film is substantially the same as the refractive index defined based on complex permittivity of the substrate,
the linear portions of the heater wire are arranged side by side so as to extend substantially perpendicularly to a plane of polarization of linearly polarized electromagnetic waves irradiated by a vehicle-mounted radar device,
the insulating film is welded and fixed to the substrate.