JPH05218731A - Parabolic surface deployment antenna - Google Patents

Abstract

(57) [Abstract] [Purpose] The objective is to obtain a mirror surface shape of a large deployable antenna that is close to the ideal parabolic surface shape and has high redundancy, without a large increase in weight. A vertical frame 1 having a main hinge 2 provided on a ridge of a polygonal prism, a diagonal wire 3 connected to the main hinge 2, a coil spring 4, a synchronizing rod 5, and a bending member 6. It comprises a standoff 8, a mirror surface tension wire 9 connecting the standoffs, a metal mesh 10 fixed to the mirror surface adjustment wire, and a mirror surface adjustment wire 11. In this deployable antenna, the mirror surface adjustment wire 9
Since the mirror surface tension wire 11 on which the metal mesh 10 is stretched is constrained at three or more points on the ideal parabolic surface, the mirror surface adjustment wire 11 is installed on the antenna mirror surface close to the ideal parabolic surface. Can only be configured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for large-diameter deployable antennas especially used in artificial satellites, has a high retractability and high rigidity, and is a lightweight deployment using a metal mesh as a mirror surface for radio wave reflection. The present invention relates to a type antenna structure.

[0002]

2. Description of the Related Art In recent years, the performance and reliability of space shuttles, alien rockets, etc. have been improved, and economic merits have been created for space utilization. In particular, a large deployable antenna mounted on an artificial satellite is in high demand for communication of mobiles such as ships and vehicles, and deployable antennas for constructing the deployable antenna have been actively developed.

FIG. 5 is a view showing the shape of a conventional deployable antenna when it is deployed. In the figure, 1 is a vertical frame which is provided on the ridge of a polygonal column and has main hinges 2 at both ends, and 3 is stretched diagonally on the upper and lower bottom surfaces of the polygonal column, and the main hinges 2 are attached at both ends.
A diagonal wire 4 connected to the coil spring, a coil spring 4 serving as a driving force for deployment, a synchronization rod 5 for transmitting the extension force of the coil spring 4 to the bending member 6, and a bending member 6 at the center thereof. An intermediate hinge which is joined and opened by means of 8; a standoff having an axis in the same direction as the axial direction of the frame at one end of the vertical frame 1; It is a metal mesh that is fixed to and has conductivity that reflects radio waves.

The vertical frame 1, the bending member 6 and the diagonal wire 3 form a polygonal prismatic frame structure at the time of unfolding, and a standoff 8 is provided, and the tip of the standoff 8 forms a mirror surface tension wire for forming an antenna mirror surface. 9 and the metal mesh 10 serve as a support structure that supports the antenna mirror surface.

The conventional deploying antenna is constructed as described above, and the shape of the metal mesh 10 which becomes the mirror surface of the antenna after deployment is determined by the position of the joint with the standoff 8 of the deploying antenna, which is ideal. The length of the standoff 8 was adjusted in order to approximate the antenna mirror surface shape.

[0006]

In the deployable antenna as described above, the shape of the antenna mirror surface, which greatly contributes to the electrical performance of the deployed antenna, is determined by positioning the standoff 8 at a larger interval as the standoff 8 becomes wider. There is a problem in that the antenna mirror surface shape with rough accuracy is formed depending on the standoff 8 that is formed, the shape error from the ideal parabolic surface shape increases, and the performance as the antenna deteriorates. ..

On the other hand, there is a demand for larger and lighter deployable antennas mounted on artificial satellites, and it is desirable to increase the interval between the standoffs 8 as much as possible to reduce the weight. In order to approach the ideal parabolic surface, it is necessary to reduce the distance between the standoffs 8, that is, the distance between the support structures, resulting in an increase in weight and a difficulty in mounting the satellite on the satellite. ..

The present invention has been made in order to solve such a problem, and it is an object of the present invention to obtain a mirror-shaped profile of a deployable antenna close to an ideal parabolic plane shape without a large increase in weight in a large deployable antenna. The purpose is to provide a structure of the parabolic surface approximation deployable antenna with higher redundancy.

[0009]

In the deployable antenna according to the present invention, a mirror surface tension adjusting wire in which a metal mesh forming a mirror surface is stretched and a diagonal wire are adjusted to a predetermined length. Are combined by.

Further, in order to obtain an antenna mirror surface closer to an ideal parabolic surface shape, a plurality of points on the mirror-stretched wire and a plurality of points on the diagonal wire are adjusted to predetermined lengths. It is connected by multiple mirror tension wires.

Further, in order to surely form an antenna mirror surface closer to an ideal parabolic surface shape, the diagonal wires and one point on the mirror-stretched wire are connected to a plurality of mirror-surface adjustment wires at a plurality of main hinge portions. Are combined by.

[0012]

In the present invention, when the deployable antenna is deployed and the metal mesh constitutes the antenna mirror surface, both ends of the mirror surface tension wire and the metal mesh are positioned by the standoffs, and further the mirror surface shape adjusting wire Since it is positioned by the coupling points, it is constrained at a total of at least three points, and these constraining points allow the mirror surface tension wire and the metal mesh to form an antenna mirror surface close to an ideal parabolic surface as an antenna mirror surface.

Further, the plurality of mirror surface adjusting wires connecting one point on the mirror surface tension wire and the points on the plurality of diagonal wires should be one of the mirror surface tension wires unless at least one mirror surface adjusting wire is damaged. The position can be adjusted on the ideal parabolic surface.

[0014]

EXAMPLES Example 1. FIG. 1 is a diagram showing an embodiment of the present invention, and 1 to 10 are exactly the same as the above-mentioned conventional device. Reference numeral 11 is a mirror surface adjusting wire that connects the mirror surface tension wire 9 and the diagonal wire 3.

In the deployable antenna constructed as described above, when the deployable antenna is deployed, the mirror surface adjusting wire 9
2 constrains the mirror surface tension wire 11 on which the metal mesh 10 constituting the antenna mirror surface is stretched at three points on the ideal parabolic surface as shown in FIG. Only by installing the mirror surface adjusting wire 11, the mirror surface adjusting wire 11 can be constructed without a large increase in weight.

Example 2. In the first embodiment, one point on the mirror tension wire 9 and one point on the diagonal wire 3 are connected by one mirror adjustment wire 11 so that the mirror tension wire 9 and the metal mesh 10 stand off. 8
Although it is constrained at a total of three points including the two points at both ends positioned by the above, in this embodiment, as shown in FIG. 3, a plurality of points on the mirror tension wire 9 and a plurality of points on the diagonal wire 3 are constrained. Point to point by a plurality of mirror surface adjustment wires 11
Mirror surface tension wire 9 at multiple points by connecting with
Since the position of the metal mesh 10 can be adjusted, an antenna mirror surface closer to the ideal parabolic surface shape can be formed.

Embodiment 3. Figure 4 shows 1 on the mirror-mounted wire
It shows a state in which a point and a diagonal wire are connected by a plurality of mirror surface adjusting wires. One point at the center of the mirror surface tension wire 9 and the diagonal wire 3 are adjusted at a plurality of main hinges 2 at a plurality of mirror surface adjusting points. It is connected by a wire 11. According to this FIG. 4, even if some of the plurality of mirror surface adjusting wires 11 shown in FIG. 4 are damaged, the other mirror surface adjusting wires remaining without being damaged cause the positions of the mirror surface tension wire and the metal mesh. Can adjust the antenna mirror surface with high redundancy.

By the way, in the above description, the present invention is applied to the hexalink truss type deployable truss antenna shown in FIG. 1, but it goes without saying that it can also be applied to other type deployable antennas. ..

[0019]

Since the present invention is configured as described above, it has the following effects.

By attaching the mirror surface adjusting wire to the mirror surface tension wire, not only both ends of the mirror surface tension wire but also at least three points can be set on the ideal parabolic mirror surface, and the shape error of the antenna mirror surface can be reduced. Since it can be reduced, the electrical characteristics of the deployable truss antenna are improved without a large increase in weight.

Further, by connecting one point on the mirror surface tension wire and a plurality of points on the diagonal wire by the mirror surface adjustment wire adjusted to a predetermined length, the antenna is provided unless all the mirror surface adjustment wires are damaged. A highly redundant antenna mirror surface that does not lose the function of bringing the mirror surface into an ideal parabolic surface shape can be constructed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a first embodiment of the present invention.

FIG. 3 is a perspective view and a sectional view showing a second embodiment of the present invention.

FIG. 4 is a perspective view and a sectional view showing a third embodiment of the present invention.

FIG. 5 is a perspective view showing a conventional example.

[Explanation of symbols]

 1 Vertical frame 2 Main hinge 3 Diagonal wire 4 Coil spring 5 Synchronous rod 6 Bending member 7 Intermediate hinge 8 Standoff 9 Mirror surface tension wire 10 Metal mesh 11 Mirror surface adjustment wire

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akio Iso 2-12-5 Iwamoto-cho, Chiyoda-ku, Tokyo Inside Institute for Space Communication Technology, Ltd. (72) Inventor Shinichi Sato 2-chome, Iwamoto-cho, Chiyoda-ku, Tokyo No. 12 No. 5 Co., Ltd. In the Space Communication Technology Laboratory (72) Inventor Yoshiyuki Okawa 325 Kamimachiya, Kamakura City Mitsubishi Electric Co., Ltd. (72) Inventor Kazuo Tanizawa 325 Kamimachiya, Kamakura Mitsubishi Electric Co., Ltd. Kamakura Factory

Claims (3)

[Claims] 1. A frame member having a plurality of vertical frames having main hinges at both ends, a bending member connecting between the vertical frames and the plurality of main hinges, and a frame member connected between the main hinges. And a supporting structure constituted by diagonal wires stretched on a diagonal line of a polygonal column formed by the frame member, a standoff for supporting the antenna mirror surface which is a radio wave reflecting surface on the supporting structure, and the stand. In a deployable antenna composed of a mirror tension wire stretched between OFF and a metal mesh stretched on the mirror tension wire, the mirror tension wire and the diagonal wire are combined and deployed. A parabolic surface approximating deployable antenna comprising a mirror surface adjusting wire whose length is adjusted so that the mirror surface tension wire is located at a predetermined position later. 2. The parabolic surface approximate deployable antenna according to claim 1, wherein the mirror surface tension wire and the diagonal wire are connected at a plurality of points by a mirror surface adjusting wire. 3. The parabolic surface approximating deployable antenna according to claim 1, wherein one point on the mirror surface tension wire and the diagonal wire are coupled by a mirror surface adjusting wire at a plurality of main hinge portions.