Radar antenna with director
A radar antenna with director includes a first main body and a second main body. The first main body has a receiving channel and two first transmission channels. The receiving channel receives a signal source, and a splitter provided between the two first transmission channels splits the signal source into two first radiative signals and transmits the same through the first transmission channels. The second main body is located at one side of the first main body. The second main body has two second primary transmission channels, and two second secondary transmission channels flanking the two second primary transmission channels. The second primary transmission channel each has a primary receiving hole. The second secondary transmission channel and the corresponding second primary transmission channel are communicated through a coupling hole. The first radiative signal is split into two second radiative signals through coupling by the coupling hole.
1 . A radar antenna with director, for working with a signal source for radiative transmission, the radar antenna comprising:
a first main body, having a receiving channel and two first transmission channels communicated with the receiving channel, wherein the receiving channel is for receiving the signal source, and a splitter arranged between the two first transmission channels is for splitting the signal source into two first radiative signals and transmitting the two first radiative signals through the two first transmission channels, respectively, a secondary splitting portion raised from two sides of the splitter along an X-axis direction; and
a second main body, being located at one side of the first main body that has the two first transmission channels, and comprising two second primary transmission channels communicated with the two first transmission channels, respectively, and two second secondary transmission channels flanking the two second primary transmission channels, wherein each of the second primary transmission channels has one end thereof adjacent to the first main body has a primary receiving hole, which has a hole size equal to a hole size of each of the first transmission channels, and each of the second secondary transmission channels is communicated with the corresponding second primary transmission channel through a coupling hole, whereby each of the first radiative signals is split into two second radiative signals through coupling by the coupling hole, and the two second radiative signals are radiatively output in a direction away from the first main body through the second primary transmission channels and the second secondary transmission channels, respectively,
wherein the X-axis direction is perpendicular to the connecting direction of the first main body and the second main body.
2 . The radar antenna of claim 1 , wherein the receiving channel at one end thereof away from the second main body has a signal receiving hole, which defines a first hole length along the X-axis direction that is between 2 mm and 5 mm, and a first hole width along a Y-axis direction that is between 1 mm and 3 mm; the receiving channel defines a first transmission length along a Z-axis direction that is between 1 mm and 3 mm.
3 . The radar antenna of claim 1 , wherein each of the first transmission channels defines a second hole length along the X-axis direction that is between 2 mm and 5 mm, a second hole width along a Y-axis direction that is between 1 mm and 4 mm, and a second transmission length along a Z-axis direction that is between 0.5 mm and 2 mm.
4 . The radar antenna of claim 1 , wherein the splitter defines an installation length along the X-axis direction that is between 0.1 mm and 1 mm.
5 . The radar antenna of claim 1 , wherein the two second primary transmission channels and the two second secondary transmission channels are arranged linearly along the X-axis direction with the two second primary transmission channels adjacent to each other, and the two second secondary transmission channels are located at opposite outer sides of the two second primary transmission channels.
6 . The radar antenna of claim 1 , wherein the primary receiving hole defines a third hole length along the X-axis direction that is between 2 mm and 7 mm, and defines a third hole width along a Y-axis direction that is between 1 mm and 4 mm.
7 . The radar antenna of claim 1 , wherein each of the second primary transmission channels at one end thereof away from the first main body has a primary output hole that has a hole size greater than a hole size of the primary receiving hole.
8 . The radar antenna of claim 7 , wherein the primary output hole has a hole width along a Y-axis direction greater than a hole width of the primary receiving hole along the Y-axis direction.
9 . The radar antenna of claim 8 , wherein each of the second primary transmission channels has a hole width along the Y-axis direction gradually widened in a direction from the primary receiving hole toward the primary output hole.
10 . The radar antenna of claim 7 , wherein the primary output hole defines a fourth hole length along the X-axis direction that is between 2 mm and 7 mm, and defines a fourth hole width along a Y-axis direction that is between 1 mm and 5 mm.
11 . The radar antenna of claim 1 , wherein the adjacent two second primary transmission channels are separated along the X-axis direction by a first interval distance that is between 0.1 mm and 0.5 mm.
12 . The radar antenna of claim 1 , wherein each of the second secondary transmission channels at one end thereof away from the first main body has a secondary output hole, and each of the second secondary transmission channels defines a hole width along a Y-axis direction, in which the hole width is gradually widened in a direction toward the secondary output hole.
13 . The radar antenna of claim 12 , wherein the secondary output hole defines a fifth hole length along the X-axis direction that is between 1 mm and 5 mm, and the secondary output hole defines a fifth hole width along the Y-axis direction that is between 1 mm and 5 mm.
14 . The radar antenna of claim 1 , wherein each of the second primary transmission channels and each of the second secondary transmission channels defines a third transmission length along a Z-axis direction that is between 1 mm and 6 mm.
15 . The radar antenna of claim 1 , wherein the coupling hole defines a sixth hole length along a Z-axis direction that is between 0.33 times and 0.46 times of a wavelength of the signal source.
16 . The radar antenna of claim 1 , wherein the coupling hole defines a seventh hole length along the X-axis direction that is between 0.2 mm and 1 mm, and defines a sixth hole width along a Y-axis direction that is between 0.5 mm and 2 mm.
17 . The radar antenna of claim 1 , wherein the signal source has a frequency between 75 GHz and 78 GHz.
18 . The radar antenna of claim 17 , wherein the coupling hole defines a sixth hole length along a Z-axis direction, and when the signal source has a frequency of 76.5 GHz, the sixth hole length is between 1.3 mm and 1.8 mm.