JP3512980B2 - Radome for antenna equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radome for an antenna device used for protecting an antenna device, for example.

[0002]

2. Description of the Related Art As is well known, a radome for protecting a radar from rain, wind, etc. is made of a material having a high radio wave transmittance. However, when rain or snow adheres to the radome, a water film is formed on the surface, and the radio wave transmittance decreases. This effect becomes larger as the frequency band used becomes higher, and the performance is remarkably deteriorated particularly in the weather radar utilizing the frequency called the X band band.

For this reason, a radome has heretofore been proposed in which measures against water film adhesion are taken. FIG. 3 is a diagram showing an example of such a conventional radome. In FIG. 3, a spherical shell-shaped radome 2 is installed on a base 1, and an antenna device (not shown) is housed in the radome 2. A water-repellent agent is applied to the surface of the radome 2, so that a water film is not formed on the surface of the radome 2 during rainfall. In addition, a gap 3 is formed on the surface of the radome 2.
Since the rain gutter 4 is provided and the rain collected by the gutter 4 is intensively caused to flow from the gap 3, it is possible to effectively prevent the formation of a water film against rain from above. Has become.

[0004]

However, such a conventional radome has the following drawbacks. That is, the water repellent must be applied regularly because it will peel off over time. However, many antenna devices are often installed at a high position above the ground in consideration of radio wave reach. Therefore, the work of applying the water repellent to the radome becomes large and dangerous.

Further, the fact that it is provided on the surface of the radome is effective against rain from above, but it cannot cope with rain from the lateral direction, and it must be said that the effect is weak especially during heavy rain. Absent.

As described above, the conventional radome does not have sufficient countermeasures against the adhesion of the water film at the time of rainfall, so that there is a possibility that the radio waves radiated by the internal antenna device may not be sufficiently transmitted at the time of rainfall. there were.

The present invention has been made in view of the above circumstances, and an object thereof is to easily and surely prevent a water film from adhering to the surface thereof, thereby improving the radio wave transmission even during rainfall. An object is to provide a radome for an antenna device that can be kept.

[0008]

In order to solve the above-mentioned problems, the present invention has a radome for an aerial device which houses an aerial device, wherein at least a side surface portion surrounding the radio wave radiation range of the aerial device is opened like a net. Is characterized by.

Further, the present invention is characterized in that the mesh-shaped opening has a multiple structure. Further, the present invention is characterized in that an overhang is formed at an upper portion of the side surface portion so as to extend outward with respect to the side surface portion.

Further, the present invention is characterized in that the mesh of the mesh-like opening portion has a size such that a water film is not formed by water droplets. Further, the present invention is characterized in that the mesh-shaped opening is formed of a member having radio wave transparency.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. (First Embodiment) FIG. 1 shows the structure of a radome 8 according to a first embodiment of the present invention. In FIG. 1, an antenna device (not shown) is installed on a base 1, and a spherical shell-shaped framework 5 is formed so as to surround the periphery thereof. A cover 6 is formed on the top of the frame 5. This cover 6
The antenna device has an area large enough to cover the antenna device from above and does not cover the radio wave radiation range of the antenna device. Furthermore, a net 7 is attached to the framework 5, thus forming a radome 8.

Here, the frame 5 and the net 7 are made of a material such as plastic which does not shield the radio waves emitted from the antenna device. Further, the size of the mesh of the mesh 7 is sufficiently rough so as not to form a water film against the attachment of raindrops, and fine enough to prevent rainwater from blowing into the radome 8 to the maximum extent. Has become.

According to the above construction, the cover 6 blocks rain from above the antenna device, and therefore the antenna device can be protected from rain from above.
Further, since the skeleton 5 and the net 7 that cover the radio wave radiation range of the antenna device are formed of members having good radio wave permeability,
Radio waves emitted from the antenna device can pass through the radome 8 without being attenuated. Furthermore, since the size of the mesh of the net 7 is rough enough not to form a water film, after rain from the lateral direction adheres to the net 7,
Runs off without forming a water film. Therefore, even when it is raining, a water film is not formed in the radio wave radiation range of the antenna device, and it becomes possible to maintain good radio wave permeability.

(Second Embodiment) FIG. 2 shows the structure of a radome 13 according to a second embodiment of the present invention. The radome 13 shown in FIG. 2 has substantially the same structure as the radome 8 of the first embodiment, but a cover 9 is provided instead of the cover 6. The cover 9 is configured such that the outer edge portion of the cover 6 has a diameter larger than the maximum diameter of the skeleton 5. That is, the cover 9 has a portion (overhanging portion 11) that is pushed out to the outside of the skeleton 5. Note that the cover 9 has an area that does not cover the radio wave radiation range 12 of the antenna device 10 as in the first embodiment.

In the above structure, the rain that has fallen on the cover 9 flows down to the outside of the side surface of the radome 13,
Rainwater from the cover 9 does not hit the net 7, and a higher water film prevention effect can be expected. Since the cover 9 does not cover the radio wave radiation range 12 of the antenna device 10, the cover 9 itself or a water film formed on the cover 9 may block radio waves emitted by the antenna device 9. Absent.

The present invention is not limited to the above embodiments. For example, in each of the above-described embodiments, the net 7 is provided only on the side surface portion of the radome body, but another net may be provided inside the side surface portion so as to further surround the antenna device. Further, these nets may be provided in multiple layers. In this way, the rain blown over the outer net is blocked by the inner net. Therefore, a greater rainproof effect can be expected.

[0017]

As described above, according to the present invention, the side surface surrounding the antenna device is sufficiently rough so that a water film is not formed against the adhesion of raindrops, and that rainwater is blown into the radome body. Since a net with a mesh that is fine enough to prevent it to the maximum extent is attached, it is possible to easily and reliably prevent the water film from adhering to the surface, and thus to maintain good radio wave transmission even during rainfall. It is possible to provide a radome for an antenna device that enables the above.

[Brief description of drawings]

FIG. 1 is a front view showing the configuration of a radome according to a first embodiment of the present invention.

FIG. 2 is a front view showing the configuration of a radome according to a second embodiment of the present invention.

FIG. 3 is a front view showing a configuration of a conventional radome.

[Explanation of symbols]

1 ... base 2,8,13 ... radome 3 ... Gap 4 ... 5 ... framework 6, 9 ... Cover 7 ... Net 8 ... Gap 10 ... Antenna system 11 ... Overhang part 12 ... Radio range

Claims (5)

(57) [Claims] 1. A radome for an aerial device, comprising a radome for an aerial device which accommodates the aerial device, wherein at least a side surface portion surrounding a radio wave radiation range of the aerial device is opened like a net. 2. The radome for an antenna device according to claim 1, wherein the mesh-shaped opening has a multiple structure. 3. The radome for an aerial device according to claim 1, wherein an upper portion of the side surface portion is formed with an overhang so as to project outward from the side surface portion. 4. The radome for an antenna device according to claim 1, wherein the mesh of the mesh-shaped opening has a size such that a water film is not formed by water droplets. 5. The radome for an antenna device according to claim 1, wherein the mesh-shaped opening is formed of a member having radio wave transparency.