JPS63302603A - Supporting structure for parabolic antenna - Google Patents

Abstract

PURPOSE:To prevent distortion due to the difference of height of a mounting plane from being generated and a mirror surface from being deteriorated, by fixing the main mirror panel of a parabolic antenna with a small diameter at a supporting structure body with three positions on a rear plane. CONSTITUTION:The parabolic antenna with the small diameter for a communication satellite is provided with a sub reflecting mirror 11 and a radio device 12 formed integrally with a primary radiator other than a main reflecting mirror panel 10. A back structure 13 is constituted of a triangular frame part 13a to mount the panel 10, a reinforcing part 13b that is the foot part of the part 13a, a frame part 13c extending from the part 13b at a certain angle to mount the sub reflecting mirror 11, and a frame part 13d to mount the device 12. The part 13a is formed almost in an isosceles triangle, and it fixes the reflecting mirror 10 with a position 21 of an apex and two positions 22 and 23 in the vicinity of both ends of a bottom side, In such a way, it is possible to prevent the distortion due to the difference of the height of the mounting plane from being generated and the accuracy of the mirror surface from being deteriorated.

Description

[Detailed Description of the Invention] [Summary] In a structure that supports the primary mirror surface of a small-diameter parabolic antenna from the back side (during pack construction), in order to improve the mounting accuracy, the back side of the primary mirror panel is installed at three locations. The mounting surface is uniquely determined. Furthermore, in order to increase the strength of the support structure, the primary mirror surface is supported by a triangular frame.

[Industrial application field]

The present invention relates to an antenna support structure, and particularly to a support structure for a mirror panel of a small-diameter parabolic antenna for satellite communications.

[Conventional technology]

In small-diameter parabolic antennas for satellite communication, especially offset type antennas, the structure that supports the main mirror panel (hereinafter referred to as pack structure) is a support structure (backup ring) made of metal pipes in the shape of a ring on the back of the panel, or Square box-shaped mounting frame (Fig. 6,
(see Figures 7 and 8) was common. In addition, in these figures, lO is the main reflecting mirror panel, 11
12 is a sub-reflector, 12 is a wireless device, 13 is a pack structure, 114 is a mount, 15 is a base, 16 is an angle adjustment device, and 17 is a primary radiator integrated with the wireless device. The back structure 13 has a rectangular box-shaped mounting frame 50, which corresponds to the apex of the rectangular mounting frame 50^1. ^2. The main reflecting mirror panel 10 is attached at four or more locations of A3°^4 using bolts or the like.

[Problem that the invention seeks to solve]

In recent years, with the use of higher frequencies due to the increase in communication capacity,
High mechanical precision is required for the antenna, but according to the conventional main reflector panel mounting/support structure as described above, the main mirror panel is supported at four or more locations, and the mutual flatness of the mounting surfaces is poor. The difference in height between the mounting surfaces causes distortion in the main mirror panel itself, degrading the precision of the mirror surface. Also,
In order to suppress such distortion, it is necessary to adjust the main mirror panel mounting surface of the pack structure by machining or by providing a movable mechanism in the mounting portion to obtain the optimum mirror surface accuracy.

As described above, if the pack structure requires high mechanical precision, the number of processing steps and adjustment steps will increase, leading to an increase in the cost of the antenna itself.

[Means for solving problems]

In order to solve such problems, according to the present invention,
A support structure for a small-diameter parabolic antenna is provided, characterized in that a main mirror panel is fixed to a support structure at three positions on the back surface thereof.

[For production]

In the present invention, since the primary mirror panel is supported and fixed at three locations, the mounting surface is uniquely determined. Problems such as distortion of the mirror panel and deterioration of mirror precision are resolved.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 1 and 2 show a small-diameter parabolic antenna for communication satellites employing the support structure of the present invention. This antenna is an offset type antenna with a diameter of 1.2 na, and has a radio device 12 integrated with a sub-reflector 11 and a -order radiator in addition to the main reflector panel IO. These are attached with high precision (±0.5 mm or less) by an integrated pack structure 13 as described later. The pack structure 13 is angle-adjustably attached to the mount 14 at a pivot point 17 and is further supported by a base 15. The angle of the pack structure 13, ie, the direction (elevation angle) of the antenna, can be adjusted by an angle adjustment device 16.

The pack structure 13 includes a triangular frame portion 13a for attaching the main reflecting mirror panel 10, and a reinforcing portion 13b corresponding to the base of the triangular frame portion 13a.
It consists of a frame part 13C extending at an angle formed by the reinforcing part 13b and for mounting the sub-reflector 11, and a frame part 13d for mounting the radio device 12 integrated with the -order radiator. Part 13aS L3b, 13
C is made of, for example, a steel material with a rectangular cross section, and is integrally constructed by welding or the like.

Triangular frame part 1 for attaching the main reflector panel IO
3a is a substantially isosceles triangle, and the position 2 of one of its vertices is
The main reflecting mirror 10 is fixed at two positions 22 and 23 close to both ends of the base.

Each position 21, 22, 23 has a mounting surface A defined by the same plane, and each position 2 also has a mounting surface A defined on the same plane.
1, 22, 3 defined by the same plane A corresponding to 23
It has two mounting surfaces. The mounting part at each position 21.22.23 has a flange 31 defining a mounting surface A;
This flange 31 has a positioning hole for receiving a positioning knock pin 32 protruding from the back surface of the main reflecting mirror panel IO. Therefore, by inserting the dowel pins 32 at each position 21, 22, 23 into the corresponding positioning holes, the main reflector panel IO can be moved into the pack structure.
13.

Then, insert the bolt 33 into the tapped hole (not shown) on the panel side.
By screwing the main reflector panel 10 into the triangular frame portion 13a of the pack structure 13, the main reflector panel 10 is fixed to the triangular frame portion 13a of the pack structure 13.

A mounting surface B that is parallel to the mounting surface A of the main reflector 10 or inclined at a certain angle is defined at the tip of the frame portion 13c for mounting the sub-reflector 11, and the sub-reflector 11 is attached to the frame portion with bolts or the like. It is fixed at 13C.

Radio device 12 integrated with primary radiator 17 (Figure 7)
The frame portion 13d for attaching the reinforcing portion 13
It is fixed at b.

3 and 4 show a positioning jig 40 used when assembling the pack structure 13, and the bank structure 13 itself is shown in phantom lines. This jig 4
00 main body consists of a steel frame framework, and has a reference plane a defined by a horizontal plane on the upper part, which corresponds to the mounting surface A of the main reflecting mirror panel 10. The reference plane a is provided at three locations (41, 42, 43) on the same plane a corresponding to the three attachment locations 21, 22, and 23 of the main reflecting mirror panel IO.

A reference surface corresponding to the mounting surface B of the sub-reflector 11 is provided on a parallel or inclined portion descending from the reference surface a in a stepwise manner. The position of this surface is set accurately in advance with reference to the mounting reference surface a of the main reflecting mirror panel 10. - The reference planes c and d corresponding to the mounting surface C1D of the secondary radiator (a dummy primary radiator 17 is used when assembling the pack structure 13) are the vertical frames of the main body of the jig 40. It is composed of two parallel inclined frames 46 and 47 extending downward at a predetermined angle from 45.

A reference plane c is provided at the tip of these inclined frames 46 and 47.
It has d. Note that the positions of these reference planes c and d are also accurately set in advance with reference to the mounting reference plane a of the main reflecting mirror panel 10. It goes without saying that each reference surface is precisely finished by machining or the like.

First, the metal fittings and the like constituting the mounting surfaces A, B, C, and 'D are temporarily joined to the main body frame of the pack structure 13 by welding, with their relative positions being rough. Then, it is mounted on the jig 40, and the corresponding reference plane a,
Match b, c, d.

At that time, with the mounting surface A of the main reflecting mirror 10 as a reference, the mounting surface of the sub-reflector 11 and the -order radiator 17 is set to the mounting surface B of the jig 40.
, C, D, each mounting surface A, B, C, D.
The metal fittings and the like constituting the pack structure 13 are firmly connected to the main body frame of the pack structure 13 by spot welding, rivets, caulking, etc. Further, knock pins can be used to position the various antenna parts mentioned above to be attached to the pack structure 13, and these can be detachably attached.

FIG. 5 shows a method of assembling an antenna using the pack structure 13 constructed in this manner.

In FIG. 5, a is the plate reference plane of the main reflecting mirror panel 10, and the main reflecting mirror panel 10 is attached at three locations 21, 22 and 23 as described above. B is a mounting reference plane for the sub-reflector 11, and C and D are reference positions for mounting the wireless device 12 integrated with the primary radiator 17. dashed line 40
schematically shows a positioning jig.

Pack structure-13 assembled as described above
The maximum load applied to the main reflective surface panel 10 is the wind pressure applied to the main reflective surface panel 10, but the main reflective surface panel 10 has one position 21 above the center and two positions 22.
3, and the positioning is done by knock pins 32, so assembly is easy. Moreover, since the triangular frame portion 13a of the pack structure 13 is used, a support structure that is small, lightweight, simple, and has sufficient strength can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, the primary mirror panel is supported and fixed at three positions, so the mounting surface is uniquely determined, and the mounting surface can be mounted with high precision ( (0.5 mm or less) parabolic antenna can be obtained.

[Brief explanation of drawings]

Figure 1 is a rear view of a parabolic antenna that employs the support structure of the present invention, Figure 2 is a side view of the parabolic antenna, and Figure 3 is a side view of the parabolic antenna.
The figure is a side view of an assembly jig used for positioning the support structure (bank structure) of the present invention, Figure 4 is a plan view of the assembly jig, and Figure 5 is assembly of an antenna using a pack structure. 6(a) is a rear view of a parabolic antenna with a conventional support structure, and FIG. 6(b) is a diagram for explaining the
6 is a sectional view taken along line BB in FIG. 6(a), FIG. 7 is a side view of the conventional parabolic antenna, and FIG. 8 is a front view of the conventional parabolic antenna. 1O...Main reflector panel 11...Sub reflector 12...Radio device 13...Support structure (pack structure) 17.
...-Next radiator 13a...3 Each frame part 21, 22, 23...Fixing point 31...Flange 33...Back view of the antenna of the positioning dowel pin embodiment Fig. 1 13a. ... Side view of the antenna of the triangular frame part example 10 - Main reflecting mirror 21, 22, 239.・
Fixed position 11... Sub-reflector 31...
7 Lunge 13 ・-Pack Structure-32...
Positioning bin 13a - Assembly explanatory diagram of the antenna of the triangular frame part embodiment Figure 10 Main reflector 13 Pack structure 11 Sub reflector 50 Mounting frame Side view of conventional antenna Front view of conventional antenna 50 Mounting frame

Claims (1)

[Claims] 1. A support structure for a small-diameter parabolic antenna, characterized in that a main mirror panel is fixed to a support structure at three positions on the back surface thereof. 2. The support structure has a substantially isosceles triangular frame portion,
2. The support structure according to claim 1, wherein the main mirror panel is supported at one position corresponding to the apex of the isosceles triangle and at two positions near both ends of the base.