Millimeter wave-radar and method for manufacturing the same
View Patent ↗A millimeter-wave radar has a radome or radar cover including a layer, the dielectric constant of which is a greater than that of the other portion without the layer, or including a magnetic loss layer in an appropriate position with respect to the antenna. The dielectric constant of the radome or radar cover can be made higher in a portion corresponding to the side of the antenna than in a portion corresponding to the front of the antenna.
1. A millimeter wave-radar comprising:
an antenna base having a transmission/reception antenna;
a housing fixing the antenna base; and
at least a radome or a radar cover enclosing the antenna base;
wherein the radome or the radar cover has a dielectric constant which progressively increases from a front of the transmission/reception antenna toward a side of the antenna.
2. A millimeter wave-radar according to claim 1 wherein a radio wave absorbing layer is provided to a side surface of the radome or the radar cover.
3. A millimeter wave-radar according to claim 1 wherein the radome or the radar cover is provided with a radio wave absorbing layer having its performance adjusted according to its position with respect to the transmission/reception antenna.
4. A millimeter wave-radar according to claim 1 wherein the radome or the radar cover is provided with a radio wave absorbing layer having a higher dielectric loss than that of a material of the radome or the radar cover.
5. A millimeter wave-radar according to claim 1 wherein the radome or the radar cover is provided with a radio wave absorbing layer that is a magnetic loss layer.
6. A millimeter wave-radar according to claim 1 wherein the radome or the radar cover is provided with a radio wave absorbing layer having a higher dielectric constant than that of a material of the radome or the radar cover.
7. A millimeter wave-radar according to claim 1 wherein the radome and the radar cover use a material with a dielectric constant of 3.0 or lower in a portion thereof corresponding to a front of the transmission/reception antenna.
8. A millimeter wave-radar according to claim 1 wherein the radome and the radar cover use, as a main ingredient in a portion thereof corresponding to a front of the transmission/reception antenna, at least one of polycarbonate, syndiotactic polystyrene, polypropylene and a combination of these materials as a main ingredient and acrylonitrile butadiene styrene (ABS).
9. A millimeter wave-radar according to claim 1 wherein the radome or the radar cover is provided with a radio wave absorbing layer formed of only a layer having a predetermined angle to a surface of the transmission/reception antenna or of a combination of the layer having the predetermined angle and a layer having a predetermined angle to a normal of the surface of the transmission/reception antenna.
10. A millimeter wave-radar according to claim 1 wherein the radome or the radar cover is provided with a radio wave absorbing layer is a mesh of less than ¼ of wavelength.
11. A millimeter wave-radar comprising:
an antenna base having a transmission/reception antenna;
a housing fixing the antenna base; and
at least a radome or a radar cover enclosing the antenna base;
wherein the radome or the radar cover is provided with a radio wave absorbing layer formed through an insert molding process or a double molding process; and
wherein the radome or the radar cover has a greater dielectric constant in a portion thereof corresponding to a side of the transmission/reception antenna than in a portion thereof corresponding to a front of the antenna.
12. A millimeter wave-radar according to claim 11 , wherein the radome and the radar cover use in a portion thereof corresponding to a front of the transmission/reception antenna a material with a dielectric constant of 3.0 or lower.
13. A millimeter wave-radar according to claim 11 , wherein the radome and the radar cover use, as a main ingredient in a portion thereof corresponding to a front of the transmission/reception antenna, at least one of polycarbonate, syndiotactic polystyrene, polypropylene and a combination of these materials as a main ingredient and ABS.
14. A millimeter wave-radar comprising:
an antenna base having a transmission/reception antenna;
a housing fixing the antenna base; and
at least a radome or a radar cover enclosing the antenna base;
wherein the radome or the radar cover has a dielectric constant which progressively increases from a front of the transmission/reception antenna toward a side of the antenna, and wherein the radome and the radar cover use in a portion thereof corresponding to a front of the transmission/reception antenna a material with a dielectric constant of 3.0 or lower.
15. A millimeter wave-radar comprising:
an antenna base having a transmission/reception antenna;
a housing fixing the antenna base; and
at least a radome or a radar cover enclosing the antenna base;
wherein the radome or the radar cover has a dielectric constant which progressively increases from a front of the transmission/reception antenna toward a side of the antenna, and wherein the radome and the radar cover use, as a main ingredient in a portion thereof corresponding to a front of the transmission/reception antenna, at least one of polycarbonate, syndiotactic polystyrene, polypropylene and a combination of these materials as a main ingredient and acrylonitrile butadiene styrene (ABS).
16. A millimeter wave-radar comprising:
an antenna base having a transmission/reception antenna;
a housing fixing the antenna base; and
at least a radome or a radar cover having an electronic permeability which progressively decreases from a front of the transmission/reception antenna toward a side of the antenna.