JPH0334241B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an improvement of an antenna with a snow cover.

[Prior art and its problems] Conventionally, there are two main types of snow covers for satellite receiving antennas: one is a hard radome as shown in Figure 1A, and the other is a hard radome as shown in Figure 2. This is the soft radome shown in A.

In Figure 1A, 1 is a parabolic antenna,
The hard radome 2 is usually made of FRP, and for satellite reception, only FRP 3 (B) or a foam 4 sandwiched between thin FRP 3 (C) is used, but both are expensive. In the case of (c), although it prevents the electrical performance of the antenna from deteriorating during snowy conditions,
In any case, when snow 5 accumulates like in d, radio waves 6
It is difficult to pass through, and the electrical performance deteriorates. In addition, it is difficult to separate, and the assembly and transportation costs to the site are high.

In the case of the soft radome shown in FIG. 2, in A, 1 is a parabolic antenna, 7 is a flexible sheet, 8 is a support frame, and some are fixed with springs 9 as shown in B.

However, in this case, even if snow accumulates, the support frame 8
However, when snow accumulates, the load is large, and the wind receiving area is large, so the wind load is large, so regular reflectors cannot be used, so electromagnetic wave absorbing material is pasted on the inside, and mounting brackets etc. It is also necessary to reinforce the support frame itself, making it expensive and bulky during transportation, resulting in a high total cost.

Therefore, it is unsuitable for use as a satellite receiving antenna, which is desired to be inexpensive.

[Structure of the Invention] The present invention is an antenna with a snow cover that was created in view of the above points, and its feature is that when snow load or wind load is applied to the support frame or support rod of the flexible sheet, The support frame or support rod has an elastic structure that returns to its original shape after being deformed in a direction that reduces the respective load or in a direction that sheds snow.

[Example] Examples of the present invention will be described with reference to FIGS. 3, 4, 5, and 6.

In FIG. 3A, the flexible sheet 7 is used as a soft radome. At this time, conventionally a rigid body has been used as the support frame or the support rod, but in the present invention, an elastic rod 10 structure is used which easily bends due to snow load, wind load, etc. In the case of snow, the elastic rod 10 bends under the weight and deforms in the direction in which the snow falls. It also deflects in the direction of reducing wind load, thus playing a role in reducing the load. B, C, and D are structural examples of elastic support rods, 13 and 14 are piano wires, and 15 is a rubber rod. In either case, the part where it contacts the soft radome is rounded to prevent the radome from tearing.

In addition, in A, the number of elastic support rods 10 is one or more, and the peripheral end 11 of the flexible sheet is tied with a string 12 like a purse.

In the embodiment shown in FIG. 4, reference numeral 7 in A is a flexible sheet that is fixed to the antenna with screws 21.

Reference numeral 20 denotes an elastic support frame, which has a spring 22 structure and an insertion type 23, as shown in the detailed partial diagram (b) of the dotted circle, for easy assembly.

In the embodiment of FIG. 5, 7 is a flexible sheet, 30
is a cylindrical support made of an elastic material such as rubber, and is held down to the parabolic antenna 1 by a band 31.

The embodiment shown in FIG. 6 is an offset antenna, in which the flexible sheet 7 has a peripheral end 11 connected to a string 12.
It's built up. 40 is an elastic support rod, and 41 is a primary radiator.

In this case, one or more elastic support rods are provided and their directions are determined so as not to affect the electrical characteristics. The arrow indicates the beam direction.

[Effects of the Invention] The effects of the present invention are as follows: (1) Since the structure of the support frame or support rod is an elastic body as described above, (1) When snow accumulates, it falls off, so snow does not accumulate in the end, and therefore electrical performance is prevented from deteriorating. do not have.

(2) Willow does not bend in the wind, so the wind load is small.

(3) It is inexpensive because its parts are small and simple;
Moreover, the transportation load is small.

etc.

[Brief explanation of drawings]

Figure 1 shows the case where the snow cover is a hard radome, A is an explanatory diagram including the antenna, B and C are explanatory diagrams of the radome constituent materials, D is an explanatory diagram when snow accumulates on the hard radome, and Fig. 2 The figure is an explanatory diagram of a soft radome, A is an explanatory diagram of the relationship between the flexible sheet and the support rod, B is a detailed explanatory diagram of the support rod, and Fig. 3 is one of the embodiments of the present invention. A side view of the antenna with a snow cover; B, C, and D are explanatory diagrams of structural examples of the support rod, respectively; Figure 4 is another example; A is an explanatory diagram of the antenna with a snow cover; B is an illustration of the support frame in A; A partially enlarged explanatory view, FIG. 5 is an explanatory view of an embodiment in which the support rod is a cylinder, and FIG. 6 is an explanatory diagram of an embodiment in the case of an offset antenna. 1... Parabolic antenna, 2... Hard radome, 3... FRP, 4... Foam, 5... Snow cover,
6... Radio wave, 7... Flexible sheet, 8... Support frame, 9... Spring, 10... Support rod, 11... Peripheral end of soft sheet, 12... String, 13, 14...
... Piano wire, 15 ... Rubber elastic body, 20 ... Elastic support frame, 21 ... Screw fastening, 22 ... Spring, 30 ... Elastic body cylindrical support body, 31 ... Band, 40 ... Elastic support frame, 41...Primary radiator.

Claims (1)

[Claims] 1. When a snow load or wind load is applied to the support frame or support rod of a flexible seat tread dome used for a parabolic antenna, offset antenna, etc. for satellite reception, the support frame or support rod bends and each An antenna with a snow cover, characterized in that the support frame or support rod has an elastic structure that returns to its original shape after being deformed in a direction to reduce the load of the snow cover or in a direction to shed snow. .