VEHICLE

• US 20170263999A1
• Filed: 03/10/2017
• Published: 09/14/2017
• Est. Priority Date: 03/11/2016
• Status: Active Grant

• Current Assignee: Nidec Corporation
• Original Assignee: Nidec Elesys Corporation (Nidec Corporation)
• Inventors: MIYOSHI, Akito, KAMO, Hiroyuki, SHINDO, Masahiro
• Granted Patent: US 10,205,215 B2
• Time in Patent Office: Days
• CPC Class Codes: H01Q 1/1271 for mounting on windscreens
• CPC Class Codes: H01Q 1/3275 mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
• CPC Class Codes: H01Q 1/3291 mounted in or on other locations inside the vehicle or vehicle body
• CPC Class Codes: H01Q 3/06 over a restricted angle
• CPC Class Codes: H01Q 9/0485 Dielectric resonator antennas

Abstract

A vehicle includes a vehicle body, a drive mechanism, a windshield, an antenna part provided in a vehicle interior, and a reflection suppression layer including a dielectric layer that closely adheres to a surface on the antenna part side of the windshield. The dielectric layer has a refractive index that is lower than a refractive index of a glass layer of the windshield and higher than a refractive index of air. The dielectric layer has a thickness that allows reflection of the transmission wave to be suppressed by interference between a reflected wave generated by reflection of the transmission wave on an interface on the opposite side of the innermost glass layer of the windshield to the antenna part side, and a reflected wave generated by reflection of the transmission wave on a surface on the antenna part side of the dielectric layer.

Claims

1. A vehicle comprising:

a vehicle body;

a drive mechanism for moving the vehicle body;

a windshield located between a vehicle interior and an outside, at least a surface on the vehicle interior side of the windshield being a surface of a glass layer;

an antenna part provided in the vehicle interior and for transmitting a transmission wave from the vehicle interior through the windshield to the outside, the transmission wave being a radio wave in a millimeter waveband, and receiving a reflected wave that enters the vehicle interior from the outside through the windshield;

a reflection suppression layer composed of at least one dielectric layer that closely adheres to the surface on the antenna part side of the windshield;

a high-frequency oscillator for outputting high-frequency electric power to the antenna part; and

a receiver for receiving input of a radio wave received by the antenna part and outputting a received signal,

wherein the at least one dielectric layer has a refractive index that is lower than a refractive index of the glass layer and higher than a refractive index of air,

the transmission wave has a horizontal polarization component greater than a vertical polarization component thereof with respect to the reflection suppression layer, and

Formula 27 is satisfied;

3. The vehicle according to claim 1, wherein

the variable j is 1.

5. The vehicle according to claim 1, wherein

the variable j is greater than or equal to 2, and

each of the second and subsequent dielectric layers counting from the antenna part side has a refractive index higher than a refractive index of a dielectric layer that is adjacent to the antenna part side of the dielectric layer.

7. The vehicle according to claim 1, wherein

the incident angle of the transmission wave on the reflection suppression layer at the center of the main lobe is greater than 10 degrees.

9. The vehicle according to claim 3, wherein

the incident angle of the transmission wave on the reflection suppression layer at the center of the main lobe is greater than 10 degrees.

11. The vehicle according to claim 5, wherein

the incident angle of the transmission wave on the reflection suppression layer at the center of the main lobe is greater than 10 degrees.

13. The vehicle according to claim 1, further comprising:

an antenna cover located between the antenna part and the windshield and covering a front of the antenna part,

wherein the antenna cover also serves as the reflection suppression layer.

15. The vehicle according to claim 3, further comprising:

an antenna cover located between the antenna part and the windshield and covering a front of the antenna part,

wherein the antenna cover also serves as the reflection suppression layer.

17. The vehicle according to claim 5, further comprising:

an antenna cover located between the antenna part and the windshield and covering a front of the antenna part,

wherein the antenna cover also serves as the reflection suppression layer.

19. The vehicle according to claim 7, further comprising:

an antenna cover located between the antenna part and the windshield and covering a front of the antenna part,

wherein the antenna cover also serves as the reflection suppression layer.

2. A vehicle comprising:

a vehicle body;

a drive mechanism for moving the vehicle body;

a windshield located between a vehicle interior and an outside, at least a surface on the vehicle interior side of the windshield being a surface of a glass layer;

an antenna part provided in the vehicle interior and for transmitting a transmission wave from the vehicle interior through the windshield to the outside, the transmission wave being a radio wave in a millimeter waveband, and receiving a reflected wave that enters the vehicle interior from the outside through the windshield;

a reflection suppression layer composed of at least one dielectric layer that closely adheres to the surface on the antenna part side of the windshield;

a high-frequency oscillator for outputting high-frequency electric power to the antenna part; and

a receiver for receiving input of a radio wave received by the antenna part and outputting a received signal,

wherein the at least one dielectric layer has a refractive index that is lower than a refractive index of the glass layer and higher than a refractive index of air,

the transmission wave has a vertical polarization component greater than a horizontal polarization component thereof with respect to the reflection suppression layer, and

Formulas 28 and 29 are satisfied;

4. The vehicle according to claim 2, wherein

the variable j is 1.

6. The vehicle according to claim 2, wherein

the variable j is greater than or equal to 2, and

each of the second and subsequent dielectric layers counting from the antenna part side has a refractive index higher than a refractive index of a dielectric layer that is adjacent to the antenna part side of the dielectric layer.

8. The vehicle according to claim 2, wherein

the incident angle of the transmission wave on the reflection suppression layer at the center of the main lobe is greater than 10 degrees.

10. The vehicle according to claim 4, wherein

the incident angle of the transmission wave on the reflection suppression layer at the center of the main lobe is greater than 10 degrees.

12. The vehicle according to claim 6, wherein

the incident angle of the transmission wave on the reflection suppression layer at the center of the main lobe is greater than 10 degrees.

14. The vehicle according to claim 2, further comprising:

an antenna cover located between the antenna part and the windshield and covering a front of the antenna part,

wherein the antenna cover also serves as the reflection suppression layer.

16. The vehicle according to claim 4, further comprising:

an antenna cover located between the antenna part and the windshield and covering a front of the antenna part,

wherein the antenna cover also serves as the reflection suppression layer.

18. The vehicle according to claim 6, further comprising:

an antenna cover located between the antenna part and the windshield and covering a front of the antenna part,

wherein the antenna cover also serves as the reflection suppression layer.

20. The vehicle according to claim 8, further comprising:

an antenna cover located between the antenna part and the windshield and covering a front of the antenna part,

wherein the antenna cover also serves as the reflection suppression layer.