Antenna equipment and vehicle antenna equipment

Abstract

[Problem] To avoid an enlargement in a direction orthogonal to the radiation plane due to a transmission line for electric power, and facilitating obtaining a desired antenna gain. [Solution] This antenna 50 has a radiation plate 56 provided with a radiation plane that radiates a radio wave and a feeding point 56A that is a section supplied with electric power from a transmission line 70A. When the radiation plate is viewed in the horizontal direction, the feeding point is provided at a position separated from the center of gravity 56B of the radiation plate by a distance A. When the radiation plate is viewed in the thickness direction, a section of the transmission line between the end portion connected to the feeding point and an intersecting portion 70A4 that intersects an edge portion of a conductor plate overlaps a specific area SA between a third straight line L3 and a fourth straight line L4 in the thickness direction of the radiation plate.

Claims

1. An antenna that transmits and receives radio waves in a predetermined frequency band, It has a transmission line that supplies power to a conductor plate which is part of the antenna, The conductor plate has a radiating surface that emits radio waves and a power supply point which is a part to which power is supplied from the transmission line, When the radiating plate is viewed along the horizontal direction, the power supply point is located at a distance A from the center of gravity of the radiating plate. A first straight line passing through the centroid and the power supply point, A second line perpendicular to the first line and passing through the centroid, A third straight line passing through the power supply point and parallel to the second straight line, Given a fourth line that is parallel to the second line and symmetric with respect to the third line, and when the centroid of the radiating plate is viewed along the thickness direction, When viewed along the thickness direction of the radiating plate, the portion between the end of the transmission line connected to the power supply point and the intersection with the peripheral edge of the conductor plate overlaps with a specific region between the third straight line and the fourth straight line in the thickness direction of the radiating plate. An antenna device having a bent portion of the transmission line that overlaps with the center of gravity in the thickness direction of the radiating plate.

2. An antenna that transmits and receives radio waves in a predetermined frequency band, It has a transmission line that supplies power to a conductor plate which is part of the antenna, The conductor plate has a radiating surface that emits radio waves and a power supply point which is a part to which power is supplied from the transmission line, When the radiating plate is viewed along the horizontal direction, the power supply point is located at a distance A from the center of gravity of the radiating plate. A first straight line passing through the centroid and the power supply point, A second line perpendicular to the first line and passing through the centroid, A third straight line passing through the power supply point and parallel to the second straight line, Given a fourth line that is parallel to the second line and symmetric with respect to the third line, and when the centroid of the radiating plate is viewed along the thickness direction, When viewed along the thickness direction of the radiating plate, the portion between the end of the transmission line connected to the power supply point and the intersection with the peripheral edge of the conductor plate overlaps with a specific region between the third straight line and the fourth straight line in the thickness direction of the radiating plate. The length L E of the portion of the transmission line located on the second straight line, which includes the portion overlapping the specific region and the thickness direction of the radiating plate, is such that, when the wavelength of the radio wave in air is λ and the wavelength shortening factor of the surrounding medium is k, L E ≧ 0.20×λ×k An antenna device that satisfies the following conditions.

3. An antenna that transmits and receives radio waves in a predetermined frequency band, It has a transmission line that supplies power to a conductor plate which is part of the antenna, The conductor plate has a radiating surface that emits radio waves and a power supply point which is a part to which power is supplied from the transmission line, When the radiating plate is viewed along the horizontal direction, the power supply point is located at a distance A from the center of gravity of the radiating plate. A first straight line passing through the centroid and the power supply point, A second line perpendicular to the first line and passing through the centroid, A third straight line passing through the power supply point and parallel to the second straight line, Given a fourth line that is parallel to the second line and symmetric with respect to the third line, and when the centroid of the radiating plate is viewed along the thickness direction, When viewed along the thickness direction of the radiating plate, the portion between the end of the transmission line connected to the power supply point and the intersection with the peripheral edge of the conductor plate overlaps with a specific region between the third straight line and the fourth straight line in the thickness direction of the radiating plate. The antenna is a slot antenna having slots extending in a direction parallel to the second straight line of the radiating plate.

4. An antenna that transmits and receives radio waves in a predetermined frequency band, It has a transmission line that supplies power to a conductor plate which is part of the antenna, The conductor plate has a radiating surface that emits radio waves and a power supply point which is a part to which power is supplied from the transmission line, When the radiating plate is viewed along the horizontal direction, the power supply point is located at a distance A from the center of gravity of the radiating plate. A first straight line passing through the centroid and the power supply point, A second line perpendicular to the first line and passing through the centroid, A third straight line passing through the power supply point and parallel to the second straight line, Given a fourth line that is parallel to the second line and symmetric with respect to the third line, and when the centroid of the radiating plate is viewed along the thickness direction, When viewed along the thickness direction of the radiating plate, the portion between the end of the transmission line connected to the power supply point and the intersection with the peripheral edge of the conductor plate overlaps with a specific region between the third straight line and the fourth straight line in the thickness direction of the radiating plate. The antenna comprises a radiating plate, a grounding conductor plate which is part of the conductor plate, and a dielectric substrate sandwiched between the radiating plate and the grounding conductor plate. The length L of the portion of the transmission line that is located on the outer periphery side of the grounding conductor plate and extends along the second straight line is such that, when the wavelength of the radio wave in air is λ and the wavelength shortening factor of the surrounding medium is k, L ≥ 0.10 × λ × k An antenna device that satisfies the following conditions.

5. An antenna that transmits and receives radio waves in a predetermined frequency band, It has a transmission line that supplies power to a conductor plate which is part of the antenna, The conductor plate has a radiating surface that emits radio waves and a power supply point which is a part to which power is supplied from the transmission line, When the radiating plate is viewed along the horizontal direction, the power supply point is located at a distance A from the center of gravity of the radiating plate. A first straight line passing through the centroid and the power supply point, A second line perpendicular to the first line and passing through the centroid, A third straight line passing through the power supply point and parallel to the second straight line, Given a fourth line that is parallel to the second line and symmetric with respect to the third line, and when the centroid of the radiating plate is viewed along the thickness direction, When viewed along the thickness direction of the radiating plate, the portion between the end of the transmission line connected to the power supply point and the intersection with the peripheral edge of the conductor plate overlaps with a specific region between the third straight line and the fourth straight line in the thickness direction of the radiating plate. The transmission line comprises a first transmission line and a second transmission line of a different type from the first transmission line. An antenna device comprising,

6. The antenna device according to any one of claims 1 to 5, wherein the intersection of the transmission line coincides with the intersection of the peripheral edge of the conductor plate and the second straight line in the thickness direction of the radiating plate.

7. The antenna device according to claim 1, wherein the radiating plate has a rectangular shape when viewed from the front.

8. The length L of the portion of the transmission line that is located on the outer periphery side of the radiating plate and extends along the second straight line is such that, when the wavelength of the radio wave in air is λ and the wavelength shortening factor of the surrounding medium is k, L ≥ 0.10 × λ × k An antenna device according to claim 3 that satisfies the following conditions.

9. When half the length of the radiating plate along the second straight line is defined as 100%, and the portion of the transmission line that overlaps with the radiating plate when viewed along the thickness direction is defined as the overlapping portion, the length L of the portion of the overlapping portion that overlaps with the second straight line is defined as the overlapping portion. Ｃ The antenna device according to claim 3, wherein the proportion is 30% or more.

10. When half the length of the grounding conductor plate along the second straight line is defined as 100%, and the portion of the transmission line that overlaps with the grounding conductor plate when viewed along the thickness direction is defined as the overlapping portion, the length L of the portion of the overlapping portion that overlaps with the second straight line is defined as the overlapping portion. Ｃ The antenna device according to claim 4, wherein the proportion is 30% or more.

11. The antenna device according to claim 4, wherein the center of gravity of the grounding conductor plate and the center of gravity of the radiating plate overlap in the thickness direction of the radiating plate, and the peripheral edge of the grounding conductor plate is located on the outer side of the peripheral edge of the radiating plate.

12. The antenna device according to claim 4, wherein the antenna comprises at least one passive conductor plate that does not overlap with the centroid of the radiating plate in the thickness direction of the radiating plate.

13. The antenna comprises a radiating plate, a grounding conductor plate aligned in the thickness direction of the radiating plate, and two unpowered conductor plates located on the radiating plate side of the grounding conductor plate. The antenna device according to claim 12, wherein the centroid of the radiating plate is located between two of the unpowered conductor plates in the thickness direction of the radiating plate.

14. The antenna device according to any one of claims 1 to 4, wherein the transmission line is composed of one type of line.

15. The antenna device according to claim 14, wherein the aforementioned one type of line is a coaxial cable.

16. The antenna device according to claim 5, wherein the first transmission line faces the surface of the antenna opposite to the radiating surface in the thickness direction of the radiating plate, and the second transmission line is located on the side of the radiating surface.

17. The antenna device according to claim 5, wherein the first transmission line extends along the second straight line to a position where it overlaps with the center of gravity and the thickness direction of the radiating plate, and the second transmission line extends along the first straight line from the position where it overlaps with the center of gravity and the thickness direction to the feed point.

18. The antenna device according to claim 17, wherein the first transmission line is a coaxial cable and the second transmission line is a coplanar feed line.

19. Vehicle window glass installed in a vehicle, An antenna device according to any one of claims 1 to 5, wherein the radiating surface is arranged to face the vehicle window glass, Equipped with, A vehicle antenna device wherein, in the thickness direction of the radiating plate, the angle between the first straight line or the second straight line and the vertical direction of the vehicle is 15° or less.

20. In the thickness direction of the radiation plate, the angle between the first straight line and the vertical direction of the vehicle is 15° or less. The vehicle antenna device according to claim 19, wherein the frequency band includes a 5.8 GHz band or a 5.9 GHz band.

21. The vehicle antenna device according to claim 19, wherein the antenna is a V2X antenna.

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