JPS6259401A - Antenna with snow melting device - Google Patents

Abstract

PURPOSE:To prevent sticking of snow on a reflection mirror and to melt the sticking snow by fitting a hood around the reflection mirror of an antenna and arranging a heater radiating and heating the reflection mirror to the hood. CONSTITUTION:The nearly cylindrical hood 3 is fitted incorporatedly so as to be projected in front of the parabolic reflection mirror 1. The heater 4 is arranged to several parts in the inner face of the hood 3. The heater 4 consists of an infrared rays heater 5 and a reflect plate 6 reflecting a far infrared-ray irradiated to the center of the reflection mirror 1. Thus, the direct sticking of snow on the inner face of the reflection mirror 1 is suppressed by the hood and the sticking snow is molten by the heater 4 through the constitution above.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an antenna having a snow melting function, and more particularly to an antenna with a snow melting device that improves the snow melting effect as well as the radiation characteristics and directivity characteristics.

[Conventional technology]

Generally speaking, communication antennas installed in cold regions are equipped with melting snow to melt the snow that has adhered to the antenna in order to prevent deterioration of electrical characteristics such as radiation characteristics due to snow that has accumulated on or near the reflecting surface. Equipment is attached. Conventionally, antennas with this type of device, such as parabolic antennas, often have a heater installed on the back side of the reflector, and the heat of this heater is used to melt the snow that has adhered to the reflector. There is. Other antennas include those that are provided with a radome that covers the front surface of the reflector, and the radome prevents snow from adhering to the reflective surface of the reflector.

[Problem that the invention seeks to solve]

In the above-mentioned conventional antennas, when a heater is attached to the back of the reflector, the reflector is easily heated due to the heat of the heater, which causes the reflector to be thermally deformed.This deformation deteriorates the precision of the mirror surface and prevents radio waves. radiation characteristics are likely to deteriorate. Additionally, in order to attach the heater to the back of the reflector, special parts and mounting structures must be used.
Moreover, with an antenna having a special configuration on the back surface of the reflector, it becomes difficult to attach a heater, and furthermore, there are problems such as it is not easy to replace the heater.

On the other hand, an antenna equipped with a radome has a problem in that the antenna gain is reduced and the radiation characteristics are deteriorated due to reflected waves from the radome itself and reflections from snow, ice, etc. attached to the radome.

[Means for solving problems]

The antenna with a snow melting device of the present invention has a hood attached around the reflector in order to not only prevent snow from accreting and melting the accumulated snow, but also to prevent deterioration of the radiation characteristics and directivity characteristics of the antenna. Moreover, this hood is provided with a heater for radiant heating at least the reflective mirror surface.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a front view of an embodiment of an antenna with a snow melting device according to the present invention, and FIG. 2 is a cross-sectional view taken along the line AA, showing an embodiment in which the present invention is applied to a parabolic antenna.

As shown in the figure, the parabolic reflector 1 configured in a rotationally symmetrical parabolic shape is supported by an antenna support portion (not shown), □, ! Ef
A primary radiator 2 that protrudes to the focal point is fixed at the center of the inner surface of the 2.5□ sea urchin 11. Around this parabolic reflector 1, It protrudes in front of the reflector 1 in the range from the circumferential side part to the circumferential upper part excluding the lower part.
Ya-oh, 1, 16,, J. 07-)'3(
7) □, 4.1 Ka. Heater 4 is installed at each of the several distributed locations (5 locations in this example).
・There is a straight infrared heater wire 5 that emits far infrared rays, and there is a part behind this infrared heater wire 5 that emits far infrared rays! +111O1*kJJt77i shot*-
t) IE shooting + & 6 a? +ll.

The bracket 7 is also used for removal.
1□ By slightly tilting the angle, far infrared rays can be emitted.
1□ Inject toward the inner surface of the parabolic reflector l
It is configured as follows.
:, Eka, 71,. . Engineering 4. From 27.7
, it is possible to prevent snow from directly adhering to the inner surface of the reflecting mirror 1, and also to prevent snow from adhering directly to the inner surface of the reflecting mirror 1. The snow is melted by being heated by a plurality of heaters 4 provided on the inner surface of the hood 3.At this time, since the heaters 4 are installed in an inclined state, they can effectively irradiate far-infrared rays onto the inner surface of the reflector l. The inner surface of the reflector 1 and the primary emitter 2 can be efficiently radiated and heated to melt snow adhering to them.Furthermore, far-infrared rays are used for heating, and since the heating is done slowly by radiant heat, there is no reflection. It is possible to prevent thermal deformation of the reflective mirror surface without overheating the mirror surface.Furthermore, since these heaters 4 are attached to the inner surface of the hood 3 using brackets 7, not only the installation work but also the heater replacement work is easy. It can be done easily.

This prevents snow from adhering to the parabolic reflector 1 and prevents the reflector from deforming.Furthermore, since there is nothing in front of the reflector that would degrade the radiation characteristics, it can be installed in cold regions. It is possible to maintain good radiation characteristics and directivity characteristics of the antenna. In addition, reflecting mirror 1
Wide-angle directivity characteristics can also be improved by the hood 3 protruding around the periphery.

6.7-1″3′ version It 1 (7) J’ilT″3
``G9J'': Missing, NTI, ゛4(7)? It goes without saying that even though there was snow on the ground, there was still a lot of snow on the ground.

Here, the number of heaters 4 does not need to be five as shown in the figure, and may be changed as appropriate depending on the snow adhesion environment, etc. :,! :t+? . 6°, 9, ), and the heater 4 is a far infrared heater 7.

Shape shown. Also,) is limited to engineering, but)7 is
I don't have one. In addition, in the above embodiment, a rotationally symmetrical parapod
[This is applied to antennas with reflectors, but
Reflection mirrors are not limited to parabolic curved surfaces, and can also be applied to offset mirror surfaces that are not rotationally symmetrical.

〔Effect of the invention〕

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Attach a hood around the mirror and attach a small
``<8 Radiant heating of reflective mirror surface 6'' - evening arrangement 5
[With this structure, the hood prevents snow from adhering to the reflector, and the radiant heater can melt the snow, which prevents deformation of the reflector and improves antenna performance. Deterioration of radiation characteristics can be prevented. Further, a hood provided around the reflecting mirror can improve the directivity characteristics over a wide angle.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. 1. 1... Parabolic reflector, 2... -order radiator, 3...
・Hood, 4... Heater, 5... Infrared heater wire, 6
... Reflector, 7... Bracket. Figure 1-I

Claims (1)

[Claims] 1. An antenna having a reflecting mirror, characterized in that a hood is attached around the reflecting mirror, and a heater for radiant heating at least the surface of the reflecting mirror is disposed in the hood. Antenna with snow melting device. 2. The snow melting device according to claim 1, wherein the hood is disposed over the circumferential side part to the circumferential upper part of the substantially circular reflecting mirror, and is configured to protrude in front of the reflecting mirror. antenna.