JPS62274903A - Parabolic antenna system - Google Patents

Abstract

PURPOSE:To prevent the increase of loss of a radome for heavy rain fall and snowfall by providing the radome with many minute holes or attaching an elastic cover to the surface of the radome to add the drop-proof structure which increases and reduces the air pressure in the radome or the cover at intervals of a certain time. CONSTITUTION:A parabolic antenna 1 attached to the side of a primary radiator 6 provided in the front end of a waveguide feeder 7 added to a transmitter- receiver 5 is provided with a conical radome 2 consisting of reinforced plastics or the like for the purpose of preventing trouble, and this radome 2 is provided with many minute holes 21. An air delivery pipe 71 is attached to the waveguide feeder 7 and is provided with a pump 4 operated by a rain fall sensor 8. When air sent from the pump 4 is sent into the parabolic antenna 1 through the waveguide feeder 7, the air pressure in the parabolic antenna 1 is made higher than that of the outside and air is always blown out from minute holes 21 provided on the radome 2. Thus, rain and snow drops sticking to the surface of the radome 2 are scattered by this air.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Summary] A parabolic antenna device having a radome for use in communication devices in the microwave band and millimeter wave band, the radome having a large number of microholes or the radome. An elastic cover is attached to the surface of the radome, and the air pressure inside the radome or cover is increased at regular intervals.

By installing a drip-proof structure that reduces pressure, it can withstand heavy rain.

Prevents radome loss from increasing during heavy snowfall and maintains stable characteristics.

[Industrial application field]

The present invention relates to a parabolic antenna device having a radome, and particularly to a parabolic antenna device equipped with a structure to prevent landing on water.

In recent years, with the rapid progress of wireless communications and the expansion of the range of use, the frequency bands used have tended to be higher (microwaves, millimeter waves, etc. with shorter wavelengths), and antennas using these frequencies are Parabolic antennas are commonly used. Many parabolic antennas are equipped with a radome to prevent interference. However, during heavy rain or heavy snowfall, the antenna gain decreases due to rainwater adhering to the radome or snow accumulation, so it is important to provide a structure to prevent water from landing on the radome.

[Conventional technology]

FIG. 4 is a diagram illustrating a conventional parabolic antenna device, and FIG. 4 (al is a side sectional view with a hood attached).

(b) is a side sectional view showing air being blown onto the -order radiator.

Fig. 4 fa+ shows a radome 2 attached to a parabolic antenna 1 with a cylindrical hood 3 attached to it to protect it from rain and snow, and Fig. 4(b) shows a parabolic antenna 1 without a radome attached. The structure is such that a pump 4 is provided to remove rain and snow adhering to the primary radiator 6, and blows air onto the primary radiator 6.

Furthermore, as a simple method (not shown in the figure), an oil-based material with good water repellency such as wax is applied to the surface of the radome 2 to prevent rain.
Methods are used to make snow more slippery and allow rain and snow to fall naturally.

[Problem that the invention seeks to solve]

The conventional parabolic antenna device mentioned above, that is, the structure in which a hood is attached, has the problem that the wind pressure load becomes large, and the snow on the hood freezes, putting a load on the antenna. However, since it requires a powerful pump and is located in the outside air, there is a problem that suspended matter in the outside air can adhere to the radome of the primary radiator.

[Means for solving problems]

The present invention solves the above problems and provides a parabolic antenna device equipped with a simple structure for preventing landing on water.

That is, in a parabolic antenna having a radome, the radome is provided with a large number of microscopic holes to increase the air pressure inside the parabolic antenna compared to the outside air, or the surface of the radome provided with the microscopic holes is provided with an elastic cover. Either the air pressure inside the parabolic antenna can be increased or decreased at regular intervals, or an elastic cover can be installed on the surface of the radome and the area around it can be tightly connected to the radome. This can be solved by providing a structure to prevent water landing, etc., which increases and decreases the air pressure inside the cover at regular intervals.

[Effect]

The structure of the above-mentioned parabolic antenna is that the radome is provided with a large number of micro-holes to make the air pressure inside the antenna higher than the outside air, and air is constantly blown out from the micro-holes to blow away rain and snow, or the surface of the radome with the micro-holes is An elastic cover is attached to the parabolic antenna, and the air pressure inside the parabolic antenna is increased and decreased at regular intervals to prevent rain and snow from landing on the parabolic antenna. The decrease in gain can be kept to a minimum.

〔Example〕

FIG. 1 is a diagram illustrating one embodiment of the present invention.
+ is a side sectional view of the main part, (b) is a side sectional view of the main part of the radome of the elastic body, and parts equivalent to those in FIG. 4 are given the same reference numerals.

Figure 1 + al shows a conical radome made of reinforced plastic or the like attached to the parabolic antenna 1 attached to the primary radiator 6 side provided at the tip of the waveguide feeder 7 attached to the transmitting/receiving device 5. 2 is attached to the radome 2, and a large number of microholes 21 are bored in this radome 2. Then, an air feed pipe 71 is attached to the waveguide feeder 7, and a pump 4 operated by the rain sensor 8 is attached to this air feed pipe 71, and the air sent from the pump 4 is transferred to the waveguide feeder 7. When the air is fed into the parabolic antenna 1 through the air, the air pressure inside the parabolic antenna 1 becomes higher than the outside air, and the radome
Air is constantly blown out through the micro holes 21 provided in the radome 2, and rain and snow adhering to the surface of the radome 2 are scattered by this air.

Fig. 1 (bl) shows a structure in which a radome 9 is made of an elastic material such as rubber and has a large number of micro holes 91.When the air pressure inside the parabolic antenna 1 is the same as the outside air, the radome 9 is a flat plate. (shown by a solid line), and the microhole 91 is in a closed state.Here, the rainfall sensor 8 detects
When the pump 4 explained in is activated, the parabolic antenna 1
The air pressure inside becomes higher than the outside air, and the radome 9 becomes arc-shaped (
(shown by the dotted line), the microhole 91, which was closed in the flat state, expands and the air blows out, as shown in Figure 1 (al.
As explained above, rain and snow adhering to the surface of the radome 9 are scattered by this air.

FIG. 2 is a main part explaining another embodiment of the present invention.
In the cross-sectional view, the same parts as in FIG. 1 are designated by the same reference numerals.

In the figure, a conical radome 2 made of reinforced plastic or the like is installed on a parabolic antenna 1 to prevent interference, a large number of micro holes 21 are bored in the radome 2, and an elastic material is formed on the surface of the radome 2. A thin cover 10 made of a member such as rubber is attached and tightly attached around the cover. Then, an air inlet pipe 11 is attached to the parabolic antenna 1, and a pump 12 that can be rotated in forward and reverse directions and operated by the rain sensor 8 is attached to the air inlet pipe 11 to keep the air pressure inside the parabolic antenna 1 constant. When the air pressure inside the parabolic antenna 1 is higher than the outside air pressure, the cover 10 expands as shown by the dotted line, and when the pressure is reduced, the cover 10 follows the surface of the radome 2. shrinks to This operation is repeated to vibrate the cover 10, and the structure is such that rain and snow adhering to the surface of the cover 10 are blown away.

FIG. 3 is a diagram illustrating another embodiment of the present invention, and FIG.
(a) is a side sectional view of the main part when the pressure is reduced, and (b) is a side sectional view of the main part when the pressure is applied. Portions equivalent to those in FIG. 2 are given the same reference numerals.

In the figure, a conical radome 2 made of reinforced plastic or the like is attached to a parabolic antenna to prevent interference, and on the surface of the radome 2 there is a thin cover 10 made of an elastic material such as rubber and having an air inlet pipe 11. Attach it and close the area around it. Then, the air supply pipe 1
1 is attached with a pump 12 that can be rotated in forward and reverse directions and is operated by the rain sensor 8, and increases or decreases the air pressure between the radome 2 and the cover 10 at regular intervals, and when the air pressure is increased, the air pressure inside the cover 10 increases. is higher than the outside pressure, so cover 1
0 expands as shown in FIG. 3 (bl), and when the pressure is reduced, the cover 10 contracts as shown in FIG. It has a structure that does not blow away rain and snow that adheres to the surface.

In this embodiment, the radome 2 is described as a conical type, but the present invention is not limited to the conical type, but can also be applied to a flat plate type radome. Furthermore, although the cover has been described as being made of rubber, it is not limited to rubber, and may be made of elastic nylon or other materials.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, rain and snow attached to a radome can be removed with a simple drip-proof structure, and the decrease in antenna gain due to rain and snow can be kept to a minimum, thereby improving the reliability of communication equipment. Extremely effective.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention.
1 is a side sectional view of the main part, (b) is a sectional view of the main part of the radome of the elastic body, FIG. 2 is a side sectional view of the main part explaining another embodiment of the present invention, and FIG. 3 is a sectional view of the main part This is a diagram illustrating another example of the figure (
al is a side sectional view of the main part when depressurized, (b) is a side sectional view of the main part when pressurized, and Figure 4 is a diagram explaining a conventional parabolic antenna device. Side sectional view. (b) is a side view of blowing air to the -order radiator. In the figure, 1 is a parabolic antenna, 2.9 is a radome, 3 is a hood, 4 is a pump, 5 is a transceiver, 6 is a primary radiator, 7 is a waveguide feeder, 8 is a rain sensor, 10 is a cover, 11.71 is an air inlet pipe, 21.91 is a microhole,
Reference numeral 12 indicates a pump that can be rotated in forward and reverse directions. 1Q) 914 sentences A-J Otsu J! 'lt#I-P-muq +gP(g'J!tk 1
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Claims (3)

[Claims] (1) Parabolic antenna (1) with radome (2)
A parabolic antenna device characterized in that the radome (2) is provided with a large number of microholes (21) so that the air pressure inside the parabolic antenna (1) is higher than that of the outside air. (2) An elastic cover (10) is attached to the surface of the radome (2) in which the microhole (21) is provided, and the periphery of the cover (10) is tightly attached to keep the air pressure inside the parabolic antenna (1) constant. The parabolic antenna device according to claim 1, wherein pressurization and depressurization are performed at intervals. (3) Parabolic antenna (1) with radome (2)
A parabola characterized in that an elastic cover (10) is provided on the surface of the parabola, and the air pressure inside the cover (10) is increased or decreased at regular intervals by closely contacting the periphery of the cover (10). antenna device.