JPS6260302A - Antenna system - Google Patents

Abstract

PURPOSE:To attain the light weight without losing the strength, rigidity and face accuracy by forming plural recesses made by notching the rear side to the rear face of a sandwich structure in an antenna system where the reflection mirror is made of the sandwich structure adhering a skin member to both sides of a core member. CONSTITUTION:Many of recesses 14 formed at the rear face by eliminating partially a back skin b2, a core (a) and an adhesive (c) of the reflection mirror 11, the pattern can be circular or square. Skins b1, b2 are made of a material such as CFRP and formed by an autoclave. In emphasizing especially the face accuracy, the core (a) whose height is lowered is left. When it is required to take the improvement of the rigidity into account in addition to the face accuracy, the core (a) whose height is lowered is left and a back skin b2' thinner than the normal back skin b2 is adhered to the part thereby improving the rigidity and face accuracy. Thus, the weight of the reflection mirror 11 is lightened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a sandwich structure used, for example, in an antenna reflector for an artificial satellite, and particularly to a lightweight sandwich structure.

[Technical background of the invention and its problems] Conventionally, in the aperture antenna device, the method shown in FIG.
), as shown in the side and front views of (b), the reflector 1
It is formed only of a sandwich structure in which skins bl and b2 are adhered to both sides of a core material a having a curved or planar shape. The skin material is made of FRP (carbon fiber, Kevlar fiber, etc.) with a small coefficient of thermal expansion.
Fiber・Re1nforced-P 1asti
cs) etc., and honeycomb cores, flex cores, etc. are used as the core material. The adhesive used is a very lightweight film-like adhesive, which makes the entire reflecting mirror extremely lightweight. Further, a mirror surface support mechanism 12 is provided at the bottom of the reflecting mirror 11, and is supported in a predetermined direction by this.

However, in recent years, as antennas are required to have higher performance, such as multi-beam configuration, there is a tendency for antenna devices to have reflective mirror surfaces with larger diameters while maintaining high precision. In this case, if the laminated structure of the skin is not changed, the weight of the skin and adhesive will increase in proportion to the area as the diameter increases, and the core thickness will also increase in accordance with the required rigidity. For this reason, not only the weight of the skin and adhesive increases in proportion to the square of the aperture ratio, but also the core thickness, resulting in a significant increase in weight. For example, the weight distributed to the antenna system from the entire satellite system has made it extremely difficult to design the antenna system.

Conventionally, as shown in FIG. 8, an antenna device has been considered in which a sandwich-structured reflector 11, which is much thinner than the conventional one, is attached to a highly rigid frame-structured support frame 13. According to this structure, the rigidity required when the diameter is increased can be met with a slight increase in weight by sizing and optimal arrangement of the mirror support structure member consisting of a frame structure.

However, as the diameter of a thin sandwich reflector increases, the weight of the skin, adhesive, and core increases in proportion to the square of the aperture ratio, as in the case of the sandwich structure shown in Figure 7 above. I come to do it. Therefore, the overall weight increase is considerable, although not as much as in the case of a sandwich structure alone.

[Purpose of the Invention] This invention was made to improve the above-mentioned problems, and its purpose is to provide an antenna device having a light reflecting mirror without sacrificing strength, rigidity, and surface accuracy. shall be.

[Summary of the Invention] That is, the antenna device according to the present invention is an antenna device in which a reflecting mirror is formed of a sandwich structure in which a skin material is bonded to both sides of a curved or planar core material. It is characterized by having a plurality of recessed portions formed on the back side.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. However, in FIG. 1, the same parts as in FIG. 7 are designated by the same reference numerals, and only the different parts will be mainly explained here.

Figure 1 shows its configuration, with figure (a) being a front view and figure (a) being a front view;
b) The figure is a sectional view taken along the line A-A in the figure (a). That is, in this antenna device, as shown in FIG. 2, the backskin B2 and core A5 adhesive C of the reflector 11 are partially removed to form a large number of recesses, that is, backless recesses 14. The backing pattern may be circular or rectangular as shown in Figure 3.

The arrangement (pitch) and size of the removed portion are determined by the reflector 11.
It is determined by analyzing the strength, rigidity, and surface accuracy required for the material, and taking into account manufacturability.

In particular, when surface accuracy is important, it is sufficient to leave the core a with a reduced height as shown in FIG. 4.

If it is necessary to consider improving rigidity in addition to surface area, as shown in Fig. By attaching a backskin (b2-) which is thinner than the skin (b2) to be adhered to the core of the part, it is possible to improve the rigidity and area. In this way, by partially removing the core together with the backskin b2 or by lowering the core height (in this case, removing the backskin b2 or creating a thinner backskin b2-), the weight of the reflector 11 can be reduced. It is possible to reduce the weight to about 1/2 compared to the conventional one.

Next, a method for manufacturing the reflecting mirror 11 will be explained. The skins bl and b2 are made of a material such as CFRP and are molded in an autoclave or the like. At this time, the front skin b1 and the back skin b2 are molded separately, and the back skin b2 is molded according to the pattern of the recessed portion 14 of the backing, and then holes are formed. Next, adhesive C1 core a5 adhesive C and back skin b2 are stacked in this order on the front skin bl, and heated and pressure molded in an autoclave or the like. At this time, the adhesive C is not filled into the part to be lined. After molding, the core a is removed according to the pattern of the recessed portions 14 of the backskin b2. In addition, even if you do not use the above method, after integrally molding by simultaneous curing molding method (at this time, adhesive C is not filled into the unlined part)
It is also possible to remove unnecessary back skin b2 and core a using a jig or the like. In addition, as shown in FIG. 5, when a thin backskin is bonded with the core left in the pattern of the recessed part 14 of the backing, if a step is formed on the core in advance, molding can be easily performed by the above-mentioned simultaneous curing molding method. It is possible to do so.

Note that this invention is not limited to the above embodiments,
For example, in addition to antenna substrates made of planar circuits, solar array substrates, etc., satellite onboard equipment can also be mounted on sandwich panels. As an example of these, an example of the equipment panel configuration is shown in FIG. That is, in the figure, 15 is a honeycomb core, 16 is a pattern portion of a recessed portion without a back, 17 is a skin, and 18 is a mounted device.

Therefore, the reflector of the antenna device configured as described above can be extremely lightweight without sacrificing the conventional performance, that is, strength, rigidity, and area coverage.

[Effects of the Invention] 2 As described in detail, according to this invention, strength, rigidity,
It is possible to provide an antenna device having a lightened reflector by cutting out so-called spaces on the back side of the core material without impairing the surface area.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the antenna device according to the present invention, Fig. 2 is a block diagram showing the detailed structure of the recessed portion which is a feature of the embodiment, and Figs. Configuration diagrams for explaining other embodiments of the invention, FIGS. 7 and 8
The figure is a configuration diagram showing the configuration of a conventional antenna device. 11...Reflector, 12...Reflector support mechanism, 13.
...Reflector support frame, 14...Backless recess pattern, 15...Core, IC...recess, 17...Skin, 18...Mounted equipment, a...Core material, bl ...Front skin, b2... Back skin, C... Adhesive. Applicant's agent Patent attorney Takehiko Suzue (a) (b) First factor Second factor 3 Figure 6 (a) Figure 6 (a) Figure 7 (b) Figure 8

Claims (1)

[Claims] An antenna device in which a reflecting mirror is formed of a sandwich structure in which skin materials are bonded to both sides of a curved or planar core material, characterized in that a plurality of unlined recesses are formed on the back side of the sandwich structure. antenna device.