JPH0326647Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a parabolic antenna for SHF reception.

(b) Prior art Since parabolic antennas for SHF reception are installed outdoors, their functionality must not be impaired under any weather conditions. However, if snow falls on the laboratory antenna, for example, and the snow falls on the reflector or the opening of the primary radiator, the gain will decrease by several dB.
It can reach up to several tens of dB.

Therefore, parabolic antennas used in areas with snowfall require some kind of snow accumulation prevention measures.

As one example of this, a technique has been proposed, as in Japanese Utility Model Application Publication No. 50-31851, in which an exhaust pipe is provided around the mirror surface of a parabolic antenna to create an air curtain to prevent snow from accumulating, but the mechanism becomes complicated and costs increase. There was a drawback.

(c) Purpose of the invention The purpose of the invention is to prevent snow from accumulating on parabolic antennas with a simple mechanism and at low cost.

(d) Structure of the invention The invention is a parabolic antenna that is equipped with a solar panel and a heating element to prevent snow accumulation.

(e) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view of an offset type parabolic antenna in this embodiment, and FIGS. 2A and 2B are a rear view and a side view of a reflecting mirror.

In the figure, 1 is a reflector whose reflective surface is made of FRP, 2 is a primary radiator, 3 is a frequency converter connected to the primary radiator, and 4 is a predetermined position of the primary radiator and frequency converter with respect to the reflector. 5 is a support arm that supports the reflector 1, 6 is an antenna mount that connects the support and the reflector, and the elevation and azimuth angles of the reflector 1 are adjustable. .

As shown in FIGS. 2A and 2B, mounting frames 7, 7 for mounting an antenna mount (not shown) are provided on the back surface of the reflector 1, and at the bottom of this mounting frame,
A solar cell panel 9 is attached via fixing members 8, 8.

Further, heating elements 10, 10, 10, which receive power supply from the solar panel, are disposed in the hatched portions of the support arm and the primary radiator.

Therefore, even if snow falls on the support arms 4, 4, 4 and the primary radiator 2 due to snowfall, the light irradiated to the solar panel 9 is changed to electric power, and the heating element 1
A current flows through 0, 10, and 10, and the snow melts due to the heat generated by the heating element.

In addition, in the case of an offset type parabolic antenna like this example, the mounting angle of the reflector with respect to the vertical direction is very small (for example, about 20 degrees) compared to a standard type parabolic antenna, so it is difficult to attach the reflector to the surface of the reflector. Snow is relatively rare.

Therefore, in this example, no heating element is provided on the surface of the reflector, but even if it is an offset type antenna, it is suitable for use in regions with particularly heavy snowfall, or for standard parabolic antennas with relatively large mounting angles. Since it is possible that snow may accumulate on the reflective mirror surface, it is desirable to attach a heating element to the reflective mirror as well.

Next, FIGS. 3(a) and 3(b) show other embodiments of the present invention.

In the embodiments described above, the solar panels cannot generate electricity at night. Therefore, in this embodiment, a storage battery 11 is disposed on the mounting frame 7 on the back surface of the reflecting mirror 1 in close proximity to the solar cell panel 9. This storage battery is made of a nickel cadmium battery, and is configured to supply current to the heating elements 10, 10, 10 and to be constantly charged when the solar panel 9 is in operation.

Therefore, the storage battery 11 is charged during the day, and the heating elements 10, 10, 10 can be made to generate heat during the night.

In the above two embodiments, the solar panel was placed below the back surface of the reflecting mirror, but if a large amount of power is required, the panel may be placed upward so that sunlight can be irradiated efficiently. You can also place it.

(f) Effects of the invention As mentioned above, according to the invention, since the solar panel is used, it is possible to melt the snow that has settled on the parabolic antenna by generating heat from the heating element without requiring any other power source. Therefore, the structure is simple and inexpensive, and it is possible to prevent gain reduction due to snow accretion on the parabolic antenna.

[Brief explanation of the drawing]

Figure 1 is an external perspective view of an offset parabolic antenna according to an embodiment of the present invention, Figures 2A and 2B are back and side views of the reflector, and Figures 3A and 3B are other than the present invention. FIG. 6 is a back view and a side view of a reflecting mirror in an example of FIG. DESCRIPTION OF SYMBOLS 1...Reflector, 2...Primary radiator, 3...Frequency converter, 4...Support arm, 9...Solar battery panel, 10...Heating element, 11...Storage battery.

Claims (1)

[Claims for Utility Model Registration] (1) A parabolic antenna characterized by comprising a solar panel and a heating element, and preventing snow accretion by causing the heating element to generate heat by generating electricity from the solar panel. (2) The parabolic antenna according to claim 1, which includes a storage battery that is charged with electric power generated by the solar panel.