JPH09223911A - Waterproof air permeable structure for antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide both waterproof property and air permeability of an antenna device without degrading the electric characteristics of the antenna device and without increasing manufacture man-hour by inserting and fixing a material provided with the air permeability and the waterproof property inside a ventilation hole opened on a metal base. SOLUTION: A radome 3 is formed in a bowl shape by the material for excellently transmitting radio waves and arranged on the metal base 2 and the part of a flange 4 formed around is fixed on the metal base 2 by bolts or the like. The ventilation hole 6 is formed at the prescribed part of the metal base 2 by counterboring work or the like. The waterproof air permeable member 8 of 'Gore-Tex(R)' or the like, for instance, is inserted to the side of the large diameter part 7 of the ventilation hole 6. For a link member, the ventilation hole 6 is formed at a center part. In the state where the waterproof air mermeable member 8 is inserted to the large diameter part 7 of the ventilation hole 6, a pressing plate 10 is inserted to the large diameter part 10. A caulking 12 fixes the pressing plate 10 to the metal base 2 and prevents the waterproof air permeable member 8 from being detached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof ventilation structure for an antenna used in an antenna device mounted on an aircraft or the like.

[0002]

2. Description of the Related Art In general, an antenna device mounted on a moving body, particularly on an aircraft, is required to have high environmental resistance. Therefore, the radiating element of the antenna is housed in the radome to make it a completely airtight structure. This often ensures high waterproofness.

[0003]

However, with such an airtight structure, a pressure difference is generated between the air pressure inside the radome and the air pressure outside the radome each time the flight altitude of the aircraft changes. Has repeatedly contracted and expanded, and in the worst case, the radome is damaged. In addition, since the radome has a completely airtight structure, there is a problem that when the radome cools, dew condensation occurs inside the radome and corrodes electric parts and the like in the radome. Therefore, as a method for solving such a problem, a method of filling the inside of the radome with a foam material has been taken, but such a method not only deteriorates the electrical characteristics of the antenna device. However, there is a problem that the number of manufacturing steps increases and the cost increases. In view of the above circumstances, the present invention provides a waterproof and air permeable structure for an antenna device, which can have both the waterproof property and the air permeability of the antenna device without deteriorating the electrical characteristics of the antenna device and increasing the number of manufacturing steps. Is intended to provide.

[0004]

In order to achieve the above object, a waterproof and ventilation structure for an antenna according to the present invention is defined in claim 1.
Then, in an antenna device having a plate-shaped metal base, a deep dish-shaped radome arranged on the metal base, and an antenna device main body arranged in the radome, a ventilation hole is formed in the metal base. It is characterized in that a material having breathability and waterproofness is inserted and fixed in this vent hole. According to a second aspect, in the waterproof ventilation ventilation structure for an antenna according to the first aspect, a counterbore is provided in a bottom portion of a metal base, a first ventilation hole is formed in the counterbore portion, and a ventilation is provided below the first ventilation hole. After inserting a material having water resistance and waterproofness, a pressing plate formed in a ring shape is inserted in the lower portion of the first ventilation hole, and the pressing plate is fixed to the metal base side by caulking, The material is fixed to the lower part of the first ventilation hole. According to a third aspect, in the waterproof ventilation structure for an antenna according to the second aspect, a bolt is used as a means for fixing the pressing plate to the metal base instead of caulking. According to a fourth aspect of the present invention, in the waterproof ventilation structure for an antenna according to the second aspect, as a means for fixing the pressing plate to the metal base, instead of caulking, a screw is cut on the metal base portion, and the pressing plate is made of metal. It is characterized by being fixed to the base. According to a fifth aspect, in the waterproof ventilation structure for an antenna according to any one of the first, second, third and fourth aspects, GORE-TEX is used as a material having air permeability and waterproof property.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. << Structure of Form Example >> FIG. 1 is a schematic structure diagram showing an example of an antenna device to which one form example of the waterproof ventilation structure for an antenna according to the present invention is applied. The antenna device 1 shown in this figure is made up of a metal base 2 formed by cutting a metal plate having a predetermined thickness, for example, 3 mm into a predetermined shape, for example, an ellipse, and a material that transmits radio waves well. A radome 3 which is formed in the shape of a basin and is arranged on the metal base 2, and a flange 4 portion formed on the periphery thereof is fixed on the metal base 2 with a bolt or the like, and the radome 3 is arranged in the radome 3. The antenna device main body 5, a ventilation hole 6 formed in a predetermined portion of the metal base 2 by counter boring, etc., and a waterproof ventilation member inserted into the large diameter portion 7 side of the ventilation hole 6, for example, GORE-TEX (gas). Water-proof ventilation member 8 such as a high-performance cloth that prevents the passage of water droplets and the like, and a ventilation hole 9 in the central portion.
A pressing plate 10 that is formed of a ring member having the above-mentioned structure, and is inserted into the large-diameter portion 7 in a state where the waterproof ventilation member 8 is inserted into the large-diameter portion 7 of the ventilation hole 6. A caulking 12 is provided for fixing the water-proof ventilation member 8 to the metal base 2 so that the waterproof ventilation member 8 does not come off.

When the antenna device 1 is attached to an aircraft or the like, the aircraft takes off, the flight altitude is gradually increased, and each time the atmospheric pressure outside the radome 3 is lowered, the antenna device 1 is inserted and fixed in the vent hole 6 of the metal base 2. Air flows from the inside of the radome 3 to the outside of the radome 3 through the waterproof ventilation member 8 so that the atmospheric pressure inside the radome 3 and the atmospheric pressure outside the radome 3 become the same. At this time, since the water droplets and the like are prevented from entering the radome 3 by the waterproof ventilation member 8, water droplets and the like outside the radome 3 are prevented from entering the radome 3, and at the same time, the radome 3 is prevented. It is prevented that the humidity in 3 becomes high. Similarly, every time the flight altitude of the aircraft decreases and the air pressure outside the radome 3 rises, air flows into the radome 3 so that the air pressure inside the radome 3 becomes the same as the air pressure outside the radome 3. To be done. Also at this time, the waterproof ventilation member 8 prevents water drops and the like from entering the radome 3, so that water drops and the like outside the radome 3 are prevented from entering the radome 3. The humidity inside the radome 3 is prevented from increasing.

<< Effects of the embodiment example >> As described above, in this embodiment example, the air holes 6 are formed in the metal base 2 which constitutes the antenna device 1, and the waterproof air vent member 8 such as GORE-TEX is inserted into the air holes 6. Then, with the ring-shaped pressing plate 10,
Since this is fixed, it is possible to secure the waterproofness and the air permeability of the antenna device 1 without deteriorating the electrical characteristics of the antenna device body 5 and without increasing the number of manufacturing steps. In addition, in this embodiment, due to the caulking 12 formed on the metal base 2,
Since the pressing plate 10 is fixed to the metal base 2, it can be manufactured at a very low cost. In addition, in this embodiment, waterproofness and breathability can be ensured within the thickness of the metal base 2, and thus the radome 3
The atmospheric pressure inside the radome 3 and the atmospheric pressure outside the radome 3 should be the same while preventing water droplets from entering the radome 3 without affecting the radiation characteristics of the antenna device body 5 housed inside. You can

<Other Embodiments> In the above-mentioned embodiments, GORE-TEX is used as the waterproof ventilation member 8, but other materials such as porous polytetrafluoroethylene (EPTFE) material are used. Any material may be used as long as it is waterproof and breathable. In the embodiment described above, the pressing plate 10 is fixed to the metal base 2 by caulking 12 to prevent the waterproof ventilation member 8 from falling off.
Instead of 2, the pressing plate 10 may be fixed to the metal base 2 with a bolt or the like, or a screw may be cut in a contact portion between the metal base 2 and the pressing plate 10 to fix the pressing plate 10 to the metal base 2. It may be fixed by screwing into.

[0009]

As described above, according to the present invention, according to the first to fifth aspects, the antenna device can be made waterproof without deteriorating the electrical characteristics of the antenna device and increasing the number of manufacturing steps. , And can be combined with breathability.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an example of an antenna device to which an example of a waterproof ventilation structure for an antenna according to the present invention is applied.

FIG. 2 is a plan view of the pressing plate portion shown in FIG. 1 when viewed from below.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna device 2 Metal base 3 Radome 4 Flange 5 Antenna device main body 6 Vent hole (1st vent hole) 7 Large diameter part 8 Waterproof ventilation member (material) 9 Vent hole 10 Holding plate 12 Caulking

Claims (5)

[Claims] 1. An antenna device having a plate-shaped metal base, a deep dish-shaped radome arranged on the metal base, and an antenna device main body arranged in the radome, wherein the metal base is provided. A waterproof ventilation structure for an antenna, which is characterized in that a ventilation hole is opened in this material, and a material having breathability and waterproofness is inserted and fixed in the ventilation hole. 2. The waterproof ventilation structure for an antenna according to claim 1, wherein a counterbore is provided in a bottom portion of the metal base, and a first ventilation hole is formed in the counterbore portion, and ventilation is provided below the first ventilation hole. After inserting a material having water resistance and waterproofness, a pressing plate formed in a ring shape is inserted in the lower portion of the first ventilation hole, and the pressing plate is fixed to the metal base side by caulking,
A waterproof ventilation structure for an antenna, wherein the material is fixed to a lower portion of the first ventilation hole. 3. The waterproof ventilation structure for an antenna according to claim 2, wherein the pressing plate is fixed to the metal base.
A waterproof ventilation structure for the antenna that uses bolts instead of caulking. 4. The waterproof ventilation structure for an antenna according to claim 2, wherein the pressing plate is fixed to the metal base.
A waterproof ventilation structure for an antenna, characterized in that, instead of caulking, a screw is cut in the metal base portion that engages with the pressing plate to fix the pressing plate to the metal base. 5. The waterproof ventilation structure for an antenna according to any one of claims 1, 2, 3 and 4, wherein GORE-TEX is used as a material having ventilation and waterproof properties. Waterproof ventilation structure.