JPH0422362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a deployable antenna reflector used, for example, in a space base, and particularly to a back support device thereof.

[Technical Background of the Invention] Generally, an antenna reflector has its mirror surface attached to a back support device, and is installed at a predetermined position via the back support device. The back support device that supports such an antenna reflector is improved to be suitable for ultra-large-diameter assembled antennas with apertures ranging from 10 m to several 100 m, which have recently been developed in the field of antennas. This is requested. As a means to improve this. With frame structures such as truss structures and rigid frame structures,
It has been considered to construct a rear support device with a parabolic recently curved surface corresponding to the antenna reflector.

[Problems with Background Art] However, the above-mentioned back support device having a frame structure has various problems when applied to a deployable antenna with a working frequency of 20 GHz or higher and an aperture diameter of several meters, for example.

That is, the specular contour of the antenna reflector is defined as an intersection line (ie, an ellipse) between a parabolic surface (paraboloid of revolution) and a cylinder parallel to the axis of rotation. As a result,
In the case of such a back support device, unless one basic shape (three-dimensional cell) formed by the frame structure is divided into small pieces, it becomes difficult to form a parabolic approximation curved surface that matches the mirror surface shape. Therefore, it is very difficult to design, very troublesome to manufacture, and
The problem is that there are a large number of joints and the weight is heavy. In particular, the problem of weight becomes a big problem especially when applied to an antenna reflector constructed in outer space such as a space base.

[Object of the Invention] The present invention was made in view of the above circumstances, and has a simple configuration and can promote weight reduction.
It is an object of the present invention to provide a back support device for an antenna reflector that can improve manufacturability and realize highly accurate matching with a mirror surface shape.

[Summary of the Invention] That is, the present invention consists of a point group equally divided in the circumferential direction on a concentric cylindrical surface, and has a rectangular upper surface and a rectangular lower surface arranged substantially parallel to each other. A plurality of trapezoidal three-dimensional cells are combined to form a substantially concentric curved surface as a whole, and one side of the rectangular upper surface and the rectangular lower surface is configured to be an antenna reflector installation surface. This is what I did.

[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a back support device for an antenna reflector according to an embodiment of the present invention. Block 10,
It is divided into three parts, 11 and 12. These first to third blocks 10, 11, and 12 are constructed with substantially the same basic structure, and have a surface on the mirror surface side (hereinafter referred to as the upper surface) and a surface farther from the mirror surface (hereinafter referred to as the upper surface).
The lower surface) is formed to be a curved surface having the same central axis. Of these, the first and third blocks 10 and 12 are shaped from each end toward the center so as to correspond to the parabolic surface of the antenna reflector (not shown). Slanted portions 101, 102 and 121, 122 are formed around the first and third blocks 10, 12 so as to correspond to the outer shape of the antenna reflector (not shown).

Here, FIG. 2 shows the basic cell pattern of the second block 11, in which a plurality of substantially similar trapezoidal cells 13 are arranged in the direction of the curved surface. As shown in FIG.
The surface connecting aehd and point dhgc (hereinafter referred to as side surface A) is approximately trapezoidal, and the other surface, that is, the point
A surface connecting aehd and point bfgc (hereinafter referred to as side surface B) and a surface connecting point abcd and point efgh (hereinafter referred to as side surface B)
The upper and lower surfaces are all rectangular (rectangular and square). The lengths of the members of this three-dimensional cell 13 and the angles formed by the members are: ad=eh=bc=fg, ae=dh=bf=cg, ab=dc, ef=hg ∠abe=∠bef=∠baf=∠afe=∠dch =∠chg
=∠cdg=∠dgh, ∠ade=∠deh=∠dah=∠ahe=∠bcf=∠cfg
=∠cbg=∠bgh, the following relationship holds true.

Each of the plurality of three-dimensional cells 13 has a side surface A
and are in contact with mutually opposing sides via the side surface B. Therefore, even if the addition of diagonal members connecting arbitrary points is considered, the point groups a, b, c, d of each three-dimensional cell 13
The angles formed by the upper surfaces (or lower surfaces) in (or e, f, g, h) can be the same for the entire surface, so one curved surface can be composed of one type.

That is, the antenna reflector back support device is constructed by continuously (laterally and circumferentially) combining one type of three-dimensional cells 13 using a well-known hinge structure or the like.
- form third blocks 10, 11, 12;
And these first to third blocks 10,1
1 and 12 are connected to each other by a hinge structure or the like, and a parabolic approximate curved surface as shown in FIG. 1 is formed. This parabolic approximation curved surface is, for example, an antenna reflector (not shown) with a focal length of 3024 mm, an aperture diameter of 3500 mm, and a distance of 276.09 mm between the center of the mirror surface and the focal axis.
When formed to correspond to a parabolic surface, it is confirmed that the maximum distance error from the parabolic surface is approximately 40.1 mm.

[Effects of the Invention] As detailed above, according to the present invention, the rectangular upper surface is formed of a group of points equally divided in the circumferential direction on a concentric cylindrical surface, and is arranged substantially in parallel. A plurality of trapezoidal three-dimensional cells each having a rectangular lower surface are combined to form a substantially concentric curved surface as a whole, and the upper surface thereof is configured to be an antenna reflector installation surface on which a parabolic surface is installed. As a result, it is possible to provide a back support device for an antenna reflector that can easily form a parabolic approximation curved surface that can be highly accurately matched with the parabolic surface of the antenna reflector as the antenna reflector installation surface. According to this, it is possible to standardize a plurality of three-dimensional cells formed with a frame structure, and there is an effect that the manufacturing including the design thereof can be simplified.

Note that this invention is not limited to the above embodiments,
It goes without saying that various other modifications can be made without departing from the spirit of the invention. ”

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a back support device for an antenna reflector according to an embodiment of the present invention, and FIGS. 2 and 3 are detailed views shown for explaining the details of FIG. 1. 10...first block, 11...second block, 12...third block, 13...three-dimensional cell.

Claims (1)

[Claims] 1 It is made up of a group of points equally divided in the circumferential direction on a concentric cylindrical surface, and includes a plurality of trapezoidal three-dimensional cells each having a rectangular upper surface and a rectangular lower surface arranged approximately in parallel. , an antenna reflection characterized in that the plurality of three-dimensional cells are combined to form a substantially concentrically curved shape as a whole, and one side of the rectangular upper surface and the rectangular lower surface is an antenna reflection mirror installation surface. Mirror back support device.