Vehicular antenna, vehicular antenna-attached window glass, and antenna system
A vehicle antenna includes a conductor plate, a radiator plate facing the conductor plate, a feeding portion located on a same side as the conductor plate with respect to the radiator plate, a connection conductor connecting the feeding portion and the radiator plate, and a first element and a second element arranged away from each other on both sides in a vehicle-width direction of a vehicle with respect to the radiator plate, wherein the radiator plate is arranged at an inclination of equal to or less than ±15 degrees with respect to a vertical plane perpendicular to a horizontal plane.
1. A vehicle antenna comprising:
a conductor plate;
a radiator plate facing the conductor plate;
a feeding portion located on a same side as the conductor plate with respect to the radiator plate;
a connection conductor connecting the feeding portion and the radiator plate; and
a first element and a second element arranged away from each other on both sides in a vehicle-width direction of a vehicle with respect to the radiator plate,
wherein the radiator plate is arranged at an inclination of equal to or less than ±15 degrees with respect to a vertical plane perpendicular to a horizontal plane, and
wherein at least one of the first element and the second element is arranged in a same layer as the conductor plate.
2. The vehicle antenna according to claim 1 , wherein the first element and the second element are arranged in a same plane as each other.
3. The vehicle antenna according to claim 1 , wherein a portion of at least one of the first element and the second element overlaps the conductor plate, as viewed from a same side as the radiator plate with respect to the conductor plate.
4. The vehicle antenna according to claim 1 , wherein the first element, the second element, the conductor plate, and the radiator plate are parallel to each other.
5. The vehicle antenna according to claim 1 , wherein the first element and the second element are located away from a center of gravity of the radiator plate, as viewed from a same side as the radiator plate with respect to the conductor plate.
6. The vehicle antenna according to claim 1 , wherein the first element and the second element are located away from the radiator plate, as viewed from a same side as the radiator plate with respect to the conductor plate.
7. The vehicle antenna according to claim 1 , wherein, as viewed from a same side as the radiator plate with respect to the conductor plate, the first element and the second element are linearly symmetrical about an axis of symmetry passing through a connection point where the connection conductor is connected to the radiator plate.
8. The vehicle antenna according to claim 1 , wherein the first element and the second element are arranged at an inclination of equal to or less than ±15 degrees with respect to the vertical plane perpendicular to the horizontal plane.
9. The vehicle antenna according to claim 1 , wherein the vehicle antenna is configured to transmit and receive an electromagnetic wave in 5.9 GHz band.
10. A vehicle antenna-attached window glass comprising:
a glass plate for a window of a vehicle; and
at least one vehicle antenna according to claim 1 attached to the glass plate.
11. An antenna system comprising:
at least two window glasses selected from among a windshield, a rear window glass, and a side window glass of a vehicle; and
at least one vehicle antenna according to claim 1 attached to each of the at least two window glasses.
12. The vehicle antenna according to claim 1 , wherein where a value obtained by subtracting −35 [dBi] from an antenna gain [dBi] in a traveling direction of the vehicle is defined as A [dBi], and a value obtained by subtracting −35 [dBi] from an antenna gain [dBi] in a vehicle-width direction of the vehicle is defined as B [dBi], a ratio A:B is in a range of 1:0.55 to 1:1.50.
13. A vehicle antenna comprising:
a conductor plate;
a radiator plate facing the conductor plate;
a feeding portion located on a same side as the conductor plate with respect to the radiator plate;
a connection conductor connecting the feeding portion and the radiator plate; and
a first element and a second element arranged away from each other on both sides in a vehicle-width direction of a vehicle with respect to the radiator plate,
wherein the radiator plate is arranged at an inclination of equal to or less than ±15 degrees with respect to a vertical plane perpendicular to a horizontal plane, and
wherein the first element and the second element do not overlap with the conductor plate, as viewed from a same side as the radiator plate with respect to the conductor plate.
14. The vehicle antenna according to claim 13 , wherein the first element and the second element are arranged on a same side as the radiator plate with respect to the conductor plate.
15. The vehicle antenna according to claim 14 , wherein at least one of the first element and the second element is arranged on an opposite side of the radiator plate from the conductor plate.
16. The vehicle antenna according to claim 14 , wherein at least one of the first element and the second element is arranged in a same plane as the radiator plate.
17. The vehicle antenna according to claim 13 , wherein at least one of the first element and the second element is arranged on an opposite side of the conductor plate from the radiator plate.
18. The vehicle antenna according to claim 13 , wherein the first element and the second element are arranged in a same plane as each other.
19. The vehicle antenna according to claim 13 , wherein a portion of at least one of the first element and the second element overlaps the conductor plate, as viewed from a same side as the radiator plate with respect to the conductor plate.
20. The vehicle antenna according to claim 13 , wherein the first element, the second element, the conductor plate, and the radiator plate are parallel to each other.
21. The vehicle antenna according to claim 13 , wherein the first element and the second element are located away from a center of gravity of the radiator plate, as viewed from a same side as the radiator plate with respect to the conductor plate.
22. The vehicle antenna according to claim 13 , wherein the first element and the second element are located away from the radiator plate, as viewed from a same side as the radiator plate with respect to the conductor plate.
23. The vehicle antenna according to claim 13 , wherein, as viewed from a same side as the radiator plate with respect to the conductor plate, the first element and the second element are linearly symmetrical about an axis of symmetry passing through a connection point where the connection conductor is connected to the radiator plate.
24. The vehicle antenna according to claim 13 , wherein the first element and the second element are arranged at an inclination of equal to or less than ±15 degrees with respect to the vertical plane perpendicular to the horizontal plane.
25. The vehicle antenna according to claim 13 , wherein the vehicle antenna is configured to transmit and receive an electromagnetic wave in 5.9 GHz band.
26. A vehicle antenna-attached window glass comprising:
a glass plate for a window of a vehicle; and
at least one vehicle antenna according to claim 13 attached to the glass plate.
27. An antenna system comprising:
at least two window glasses selected from among a windshield, a rear window glass, and a side window glass of a vehicle; and
at least one vehicle antenna according to claim 13 attached to each of the at least two window glasses.
28. The vehicle antenna according to claim 13 , wherein where a value obtained by subtracting −35 [dBi] from an antenna gain [dBi] in a traveling direction of the vehicle is defined as A [dBi], and a value obtained by subtracting −35 [dBi] from an antenna gain [dBi] in a vehicle-width direction of the vehicle is defined as B [dBi], a ratio A:B is in a range of 1:0.55 to 1:1.50.
29. A vehicle antenna comprising:
a conductor plate;
a radiator plate facing the conductor plate;
a feeding portion located on a same side as the conductor plate with respect to the radiator plate;
a connection conductor connecting the feeding portion and the radiator plate; and
a first element and a second element arranged away from each other on both sides in a vehicle-width direction of a vehicle with respect to the radiator plate,
wherein the radiator plate is arranged at an inclination of equal to or less than ±15 degrees with respect to a vertical plane perpendicular to a horizontal plane, and
wherein a value obtained by subtracting −35 [dBi] from an antenna gain [dBi] in a traveling direction of the vehicle is defined as A [dBi], and a value obtained by subtracting −35 [dBi] from an antenna gain [dBi] in a vehicle-width direction of the vehicle is defined as B [dBi], a ratio A:B is in a range of 1:0.55 to 1:1.50.
30. The vehicle antenna according to claim 29 , wherein the first element and the second element are arranged on a same side as the radiator plate with respect to the conductor plate.
31. The vehicle antenna according to claim 30 , wherein at least one of the first element and the second element is arranged on an opposite side of the radiator plate from the conductor plate.
32. The vehicle antenna according to claim 30 , wherein at least one of the first element and the second element is arranged in a same plane as the radiator plate.
33. The vehicle antenna according to claim 29 , wherein at least one of the first element and the second element is arranged on an opposite side of the conductor plate from the radiator plate.
34. The vehicle antenna according to claim 29 , wherein the first element and the second element are arranged in a same plane as each other.
35. The vehicle antenna according to claim 29 , wherein a portion of at least one of the first element and the second element overlaps the conductor plate, as viewed from a same side as the radiator plate with respect to the conductor plate.
36. The vehicle antenna according to claim 29 , wherein the first element, the second element, the conductor plate, and the radiator plate are parallel to each other.
37. The vehicle antenna according to claim 29 , wherein the first element and the second element are located away from a center of gravity of the radiator plate, as viewed from a same side as the radiator plate with respect to the conductor plate.
38. The vehicle antenna according to claim 29 , wherein the first element and the second element are located away from the radiator plate, as viewed from a same side as the radiator plate with respect to the conductor plate.
39. The vehicle antenna according to claim 29 , wherein, as viewed from a same side as the radiator plate with respect to the conductor plate, the first element and the second element are linearly symmetrical about an axis of symmetry passing through a connection point where the connection conductor is connected to the radiator plate.
40. The vehicle antenna according to claim 29 , wherein the first element and the second element are arranged at an inclination of equal to or less than ±15 degrees with respect to the vertical plane perpendicular to the horizontal plane.
41. The vehicle antenna according to claim 29 , wherein the vehicle antenna is configured to transmit and receive an electromagnetic wave in 5.9 GHz band.
42. A vehicle antenna-attached window glass comprising:
a glass plate for a window of a vehicle; and
at least one vehicle antenna according to claim 29 attached to the glass plate.
43. An antenna system comprising:
at least two window glasses selected from among a windshield, a rear window glass, and a side window glass of a vehicle; and
at least one vehicle antenna according to claim 29 attached to each of the at least two window glasses.