JPH07245522A - Antenna reflector - Google Patents

Abstract

PURPOSE:To improve the stability of communication by suppressing warp or distortion of the antenna reflector so as to prevent defocusing of a radio wave. CONSTITUTION:A throughhole 4 is provided to a reflector 2 and a stand-off 5 is penetrated to the throughhole 4 from a support structure member 1 to support a reflector 3. A flexible stand-off withstanding the supporting force and flexible with a bent is adopted for each stand-off 5. Then it is prevented that the amount of deformation of the reflector 3 gives effect on the reflector 2, resulting in warping or deforming the reflector 2. Furthermore, it is avoided that deformation such as elongation or contraction of the reflector 3 results in deformation such as warp or distortion. Thus, defocusing of a radio wave resulting from warp or distortion is suppressed to improve the stability of communication.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication antenna reflector mounted on, for example, an artificial satellite or space equipment.

[0002]

2. Description of the Related Art FIG. 5 is a diagram showing a conventional dual grid antenna reflector, FIG. 6 is a diagram for explaining the configuration of the conventional dual grid antenna reflector, and FIG. 7 is a modification mode of the conventional dual grid antenna reflector. It is a figure explaining. In the figure, 1 is a support structural member that supports two laminated reflectors, and 2 is a laminated lower side (one closer to the support structural member) of the two laminated reflectors supported by the support structural member 1. Antenna reflector 3 is support structure member 1
Of the two laminated reflectors supported by the antenna reflector on the upper side (the side farther from the support structure member) of the laminated body, 7 is the antenna reflector 2 and the antenna reflector 3.
It shows a cylindrical support member that is inserted between the two antenna reflectors and connects the two antenna reflectors. The support structure member 1, the antenna reflector 2, the cylindrical support member 7
Is a member in which carbon fiber reinforced plastic or aluminum honeycomb is adopted as the core and carbon fiber reinforced plastic is applied to the outer skin. The material of the antenna reflector 3 is a composite material that employs aramid resin fiber having radio wave transparency.

Next, the structure of a conventional dual grid antenna reflector will be described. In the conventional dual grid antenna reflector, the antenna reflector 2 is directly fixed to the support structure member 1. On the other hand, the antenna reflector 3 is fixed to the cylindrical supporting member 7, and the cylindrical supporting member 7 is fixed to the antenna reflector 2. As described above, since the antenna reflector 2 is directly fixed to the support structure member 1, as a result, the antenna reflector 3 is indirectly supported by the support structure member 1 via the cylindrical support member 7 and the antenna reflector 2. It has a structure that

[0004]

In a space environment, the antenna reflector is sometimes 100 degrees Celsius due to direct sunlight.
The temperature becomes higher than 100 ° C., and due to this, thermal expansion of the member causes extension and deformation. Also, when the spacecraft enters the shadow of the earth, the temperature of the antenna reflector drops rapidly and sometimes reaches below -150 degrees Celsius. Due to this, the contraction of the antenna reflector occurs due to the thermal contraction of the member. FIG. 7 is a diagram illustrating a modification mode of the conventional dual grid antenna reflector. Figure 5,
In the structure of the conventional dual grid antenna reflector shown in FIG. 6, since the antenna reflector 2 and the antenna reflector 3 are firmly coupled by the cylindrical support member 7, the antenna reflector 2 and the antenna reflector 3 are connected.
If the magnitude of the deformation of the extension or contraction of the reflectors is different, the reflector will be warped or distorted as shown in FIGS. 7 (a) and 7 (b). Here, in FIG. 7A, the deformation due to the temperature change of the antenna reflector 3 is relatively larger than the extension deformation of the antenna reflector 2.
Shows that the antenna reflector is warped due to a large extension deformation of the antenna. FIG. 7B shows the antenna reflector 3 rather than the contracted deformation of the antenna reflector 2.
Shows that the antenna reflector is distorted toward the inner side. Due to the deformation of the antenna reflector as described above, a phenomenon occurs in which the focus of the radio wave reflected by the conventional dual grid antenna reflector is deviated from an expected position, which causes deterioration of communication accuracy.

The prevention of the warp or distortion of the antenna reflector has been a problem to be solved in order to suppress the shift of the focus of radio waves, prevent the deterioration of communication accuracy, and improve the communication stability.

The present invention has been made to solve the above problems, and prevents the antenna reflector from warping or distorting, suppressing the focus shift of radio waves due to the warping or distortion, and preventing the deterioration of communication accuracy. , It aims to improve the stability of communication.

[0007]

A dual grid antenna reflector according to the present invention is an antenna reflector 2.
In order to prevent the antenna reflector 3 from warping or distorting when the extension or contraction deformation of the antenna reflector 3 is different from that of the antenna reflector 3, a through hole is provided in the antenna reflector 2 and a standoff is passed through the through hole. The antenna reflector 3 is directly attached to the support structure member 1 by the standoff.

Further, the standoff supporting the antenna reflector 3 is a plate-shaped flexible standoff that is strong against the support and soft against bending, and the extension and contraction of the antenna reflector 3 are deformed in the in-plane direction of the antenna reflector 3. It is a structure that prevents the deformation of the warp.

According to the present invention, the standoffs are arranged substantially in the center of the antenna reflector, and the flexible standoffs are arranged on both outer sides along the axis of the support structure member.

Further, according to the present invention, the standoff is arranged at one end of the antenna reflector, and the flexible standoff is arranged in one direction toward the other.

[0011]

In the dual grid antenna reflector configured as described above, since the antenna reflector 3 is directly supported by the support structure member 1 through the standoff, the amount of deformation of the antenna reflector 3 affects the antenna reflector 2. The antenna reflector 2 is not bent or distorted. As a result, the shift of the focus of the radio wave due to the warp or distortion is suppressed, and the stability of communication is improved.

Further, the standoff supporting the antenna reflector 3 is a plate-shaped flexible standoff that is strong against the support and soft against bending, and the antenna reflector 3 is extended and contracted in the in-plane direction of the antenna reflector 3. With this structure, the antenna reflector 3 can be deformed in a similar shape to that before the deformation, and thus the antenna reflector 3 can be prevented from warping or distorting. Due to the above, the focus shift of the radio wave due to the warp or distortion is suppressed, and the stability of communication is further improved.

According to the present invention, the standoffs are arranged substantially in the center of the antenna reflector, and the flexible standoffs are arranged on both outer sides along the axis of the support structure member, so that the antenna reflector 3 extends and contracts to prevent deformation of the antenna reflector 3. By adopting a structure in which the antenna reflector 3 is deformed in the in-plane direction, the deformation of the antenna reflector 3 can be made similar to that before the deformation, and thus the warp and distortion of the antenna reflector 3 can be prevented. Due to the above, the shift of the focus of the radio wave due to the warp or distortion is suppressed, and the stability of communication is further improved.

Further, according to the present invention, the standoff is arranged at one end of the antenna reflector, and the flexible standoff is arranged in one direction toward the other side, so that the antenna reflector 3 extends and contracts so that the deformation of the antenna reflector 3 can be caused by deformation. By adopting a structure in which the antenna reflector 3 is deformed inward, the antenna reflector 3 can be deformed in a similar shape to that before the deformation, so that the antenna reflector 3 can be prevented from being warped or distorted. Due to the above, the shift of the focus of the radio wave due to the warp or distortion is suppressed, and the stability of communication is further improved.

[0015]

【Example】

Example 1. FIG. 1 shows an embodiment of the invention in which an antenna reflector 2 is provided with a through hole, and a support structure member 1 is provided therein.
Shows a dual grid antenna reflector having a structure in which the antenna reflector 3 is directly attached to the support structural member 1 through the standoff through the standoff, and FIG. 2 illustrates the configuration of the dual grid antenna reflector showing one embodiment of the present invention. FIG. . In the figure, reference numeral 4 denotes a through hole provided in the antenna reflector 2, and the position of the through hole 4 is determined from the viewpoint of structural strength and radio wave reflection characteristics. Reference numeral 5 is a standoff that supports the antenna reflector 3. The standoff 5 is directly bonded to the support structural member 1. The standoff 5 and the antenna reflector 3 and the standoff 5 and the support structure member 1 are joined by an adhesive, for example. The standoff 5 uses an aramid resin composite material having excellent radio wave transmission characteristics in order to minimize electrical interference.

In the dual grid antenna reflector constructed as described above, since the antenna reflector 3 is directly attached to the support structure member 1 via the standoff, the amount of deformation of the antenna reflector 3 is reflected in the antenna reflector 2. It does not affect or warp or distort the antenna reflector 2. As a result, deviation of the focus of the radio wave due to warpage or distortion can be suppressed, and communication stability can be improved.

Example 2. FIG. 3 shows a dual grid antenna having a structure in which a through hole 4 is provided in an antenna reflector 2 showing an embodiment of the present invention, and the antenna reflector 3 is directly attached to the support structure member 1 through a standoff from the support structure member 1. In the reflector, the standoff that supports the antenna reflector 3 is a plate-shaped flexible standoff that is strong against the support and soft against bending, and the antenna reflector 3 is deformed in the in-plane direction due to the deformation of extension and contraction. It is a figure explaining the structure of the dual grid antenna reflector which was made into the structure which became, and was prevented from becoming the deformation | transformation of a warp or distortion. FIG. 4 is a diagram for explaining a modification mode in the dual grid antenna reflector showing the embodiment of the present invention. Here, FIG. 4A is a diagram showing a deformed state of the antenna reflector when the extended deformation of the antenna reflector 3 is relatively larger than the extended deformation of the antenna reflector 2. Further, FIG. 4B is a diagram showing a deformed state of the antenna reflector when the contracted deformation of the antenna reflector 3 is relatively larger than the contracted deformation of the antenna reflector 2. In the figure, 6 is a plate-like flexible standoff that is strong against support and soft against bending, and supports the antenna reflector 3. The flexible standoff 6 is directly bonded to the support structural member 1. The flexible standoff 6 uses an aramid resin composite material having excellent radio wave transmission characteristics in order to minimize electrical interference.

In the dual grid antenna reflector constructed as described above, the standoff for supporting the antenna reflector 3 is a plate-like flexible standoff 6 which is strong against the support and soft against bending. Since the flexible standoff is compliant with the bending mode, it does not oppose the deformation of the extension and contraction of the antenna reflector 3. That is, the deformation of the antenna reflector 3 is a deformation in the in-plane direction as shown in FIGS. 4 (a) and 4 (b). Since this deformation is similar to the shape of the antenna reflector 3 before the deformation, the warp or distortion of the antenna reflector 3 is avoided. This suppresses the shift of the focus of the radio waves due to warpage and distortion,
The stability of communication can be further improved.

In the above embodiment, the standoff 5 is arranged in the center and the flexible standoffs 6 are arranged on both outer sides along the axis of the reflector support structural member 1. However, for example, one of the antenna reflectors is used. It is within the scope of the present invention that the standoffs 5 are arranged at one end and the flexible standoffs 6 are arranged in one direction toward the other. Further, the number of flexible standoffs 6 arranged along the axis of the support structure member 1 is not limited to two per one support structure member 1 as in the above embodiment, and the number of standoffs 5 is not limited to one. The number of flexible standoffs 6 arranged in two directions on the support structure member 1 does not necessarily have to be equal.

[0020]

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

Since the antenna reflector 3 is directly attached to the support structure member 1 via the standoff, the amount of deformation of the antenna reflector 3 affects the antenna reflector 2 so that the antenna reflector 2 is bent or distorted. There is no. As a result, deviation of the focus of the radio wave due to warpage or distortion can be suppressed, and communication stability can be improved.

Further, the standoff supporting the antenna reflector 3 is a plate-like flexible standoff that is strong against the support and soft against bending, whereby the antenna reflector 3 extends and contracts in the in-plane direction. It can be a transformation. This allows the antenna reflector 3
The deformation of is similar to that before the deformation, and deformation of warpage and distortion can be avoided. Therefore, the shift of the focus of the radio wave due to the warp or distortion can be suppressed, and the stability of communication can be further improved.

According to the present invention, the standoff is arranged substantially in the center of the antenna reflector, and the flexible standoffs are arranged on both outer sides along the axis of the support structure member. By adopting a structure in which the antenna reflector 3 is deformed in the in-plane direction, the deformation of the antenna reflector 3 can be made similar to that before the deformation, and thus the warp and distortion of the antenna reflector 3 can be prevented. Due to the above, the focus shift of the radio wave due to the warp or distortion is suppressed, and the stability of communication is further improved.

Further, according to the present invention, the standoff is arranged at one end of the antenna reflector, and the flexible standoff is arranged in one direction toward the other side so that the antenna reflector 3 extends and contracts due to deformation of the surface of the antenna reflector 3. By adopting a structure in which the antenna reflector 3 is deformed inward, the antenna reflector 3 can be deformed in a similar shape to that before the deformation, so that the antenna reflector 3 can be prevented from being warped or distorted. Due to the above, the focus shift of the radio wave due to the warp or distortion is suppressed, and the stability of communication is further improved.

[Brief description of drawings]

FIG. 1 shows a dual grid antenna reflector having a structure in which a through hole is provided in a lower antenna reflector 2 and a support structure member 1 passes through a standoff to support an upper antenna reflector 3 according to an embodiment of the present invention. FIG.

FIG. 2 is a dual grid antenna reflector having a structure in which a lower antenna reflector 2 according to an embodiment of the present invention is provided with a through hole, and a support structure member 1 is passed through a standoff to support the upper antenna reflector 3. It is a figure explaining the structure of.

FIG. 3 is a dual grid antenna reflector having an antenna reflector 3 supported by a standoff according to an embodiment of the present invention, in which a standoff that supports the antenna reflector 3 has a plate-like shape that is strong against the support and soft against bending. It is a figure explaining the structure of the dual grid antenna reflector made into the flexible standoff.

FIG. 4 is a diagram illustrating a modification mode of the dual grid antenna reflector according to the embodiment of the present invention.

FIG. 5 is a diagram showing a conventional dual grid antenna reflector.

FIG. 6 is a diagram illustrating a configuration of a conventional dual grid antenna reflector.

FIG. 7 is a diagram illustrating a modification mode of a conventional dual grid antenna reflector.

[Explanation of symbols]

1 Support structure member 2 Antenna lower reflector on the lower side of the stack (closer to the support structural member 1) 3 Antenna reflector upper side of the stack (the side farther from the support structural member 1) 4 Through hole 5 Standoff 6 Flexible standoff 7 Cylindrical support member

Claims (4)

[Claims] 1. A dual grid antenna reflector in which two antenna reflectors are stacked at intervals and are supported by a reflector support structural member in order to reflect different polarized waves such as horizontal polarized waves and vertical polarized waves by separate antenna reflectors. In the above, in the two reflectors stacked with respect to the support structure member, a through hole is provided in the reflector on the lower side of the stack (closer to the support structure member), and a standoff is passed through the through hole to form the upper side of the stack (from the support structure member). An antenna reflector having a structure in which a (distant side) reflector is directly attached to a support structure member by the standoff. 2. The standoff supporting the reflector on the upper side of the stack (away from the support structure member) is a plate-like flexible standoff that is strong against the support and soft against bending. 1. The antenna reflector according to 1. 3. The antenna reflector according to claim 2, wherein the standoffs are arranged substantially in the center of the antenna reflector, and the flexible standoffs are arranged on both outer sides along the axis of the support structure member. 4. The antenna reflector according to claim 2, wherein the standoff is arranged at one end of the antenna reflector, and the flexible standoff is arranged in one direction toward the other end.