Radome for on-board radar device
A radome for on-board radar devices 1 is provided with heater wires 3 wired in parallel so as to be separated from each other in a plane direction of an electromagnetic-wave-transmitting base member. A line pitch d of the heater wires 3 arranged in parallel in an electromagnetic-wave transmission region R of the base member is set to 0.2 to 2.5 times a wavelength of electromagnetic waves of the radar of an on-board radar device. A surface occupancy rate of the heater wires 3 arranged in parallel in the electromagnetic-wave transmission region R of the base member is set to be greater than 10% to 35%. The present invention provides a radome for on-board radar devices with which it is possible to obtain an electromagnetic-wave transmission property required of a radome, and to melt snow satisfactorily with a high heater performance.
1. A radome for an on-board radar device comprising:
heater wires wired in parallel so as to be separated from each other in a plane direction of an electromagnetic-wave-transmitting base member, wherein
a line pitch of the heater wires arranged in parallel in an electromagnetic-wave transmission region of the base member is set to 0.2 to 2.5 times a wavelength of electromagnetic waves of a radar of the on-board radar device, and
a surface occupancy rate of the heater wires arranged in parallel in the electromagnetic-wave transmission region of the base member is set to be greater than 10% to 35%.
2. The radome for the on-board radar device according to claim 1 , wherein
the line pitch of the heater wires arranged in parallel in the electromagnetic-wave transmission region of the base member is set to 1.6 to 2.0 times the wavelength of the electromagnetic waves of the radar of the on-board radar device, and
the surface occupancy rate of the heater wires arranged in parallel in the electromagnetic-wave transmission region of the base member is set to be greater than 10% to 25%.
3. The radome for the on-board radar device according to claim 2 , wherein
the surface occupancy rate of the heater wires arranged in parallel in the electromagnetic-wave transmission region of the base member is set to be greater than 10% to 20%.
4. The radome for the on-board radar device according to claim 3 , wherein
directions of currents flowing through the heater wires that are wired adjacent to each other are substantially anti-parallel to each other.
5. The radome for the on-board radar device according to claim 2 , wherein
the line pitch of the heater wires arranged in parallel in the electromagnetic-wave transmission region of the base member is set to 1.7 to 2.0 times the wavelength of the electromagnetic waves of the radar of the on-board radar device.
6. The radome for the on-board radar device according to claim 5 , wherein
directions of currents flowing through the heater wires that are wired adjacent to each other are substantially anti-parallel to each other.
7. The radome for the on-board radar device according to claim 2 , wherein
directions of currents flowing through the heater wires that are wired adjacent to each other are substantially anti-parallel to each other.
8. The radome for the on-board radar device according to claim 1 , wherein
the line pitch of the heater wires arranged in parallel in the electromagnetic-wave transmission region of the base member is set to 1.5 to 2.3 times the wavelength of the electromagnetic waves of the radar of the on-board radar device, and
the surface occupancy rate of the heater wires arranged in parallel in the electromagnetic-wave transmission region of the base member is set to be greater than 10% to 20%.
9. The radome for the on-board radar device according to claim 8 , wherein
directions of currents flowing through the heater wires that are wired adjacent to each other are substantially anti-parallel to each other.
10. The radome for the on-board radar device according to claim 1 , wherein
the surface occupancy rate of the heater wires arranged in parallel in the electromagnetic-wave transmission region of the base member is set to be greater than 10% to 15%.
11. The radome for the on-board radar device according to claim 10 , wherein
directions of currents flowing through the heater wires that are wired adjacent to each other are substantially anti-parallel to each other.
12. The radome for the on-board radar device according to claim 1 , wherein
directions of currents flowing through the heater wires that are wired adjacent to each other are substantially anti-parallel to each other.