JPS60203004A - Reflector for microwave antenna - Google Patents

Abstract

PURPOSE:To attain the light weight and low cost with satisfactory reflection characteristics with a reflector for microwave antenna, by using the fiber yarn obtained by mixing a polymer conductive fiber and a conductive fiber into the fiber reinforced resin to obtain a composite fabric material and setting proper yarn and fabric characteristics. CONSTITUTION:A fabric material 11 containing the fiber yarn obtained by mixing a polymer conductive fiber and a conductive fiber is put on the fiber reinforced resin GFRP10 forming a structure main body of a reflector. The material 11 serves as a reflecting surface of radio waves. A coating material 12 is put on the material 11 to put the GFRP10 and the material 11 together. Here the resistance value of said fiber yarn is set at 0.5-5kOMEGA/10cm together with the resistance value set at 0.05-50OMEGA between the counter sides of a square of the material 11 having 65mm. each side. Then the weight per square meter of the material 11 is set at 40-180g/m<2> respectively. In such a way, both the light weight and low cost are attained together with satisfactory reflection characteristics with a reflector for microwave antenna.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a microwave antenna rectifier suitable for use as a parabolic antenna, an offset antenna, or the like.

(Technical Background) Currently, there are plans to put satellite broadcasting using SHF radio waves into practical use, and this satellite broadcasting will be caught by current television receivers via a parabolic antenna or an offset antenna and a converter.

As shown in Fig. 1, the parabolic antenna has seven rectors 2 arranged on a curved surface near the apex of a paraboloid 1, and a primary radiator arranged at the focal point 3 of the paraboloid 1. . Also,
The offset antenna has seven rectors 4 arranged on a curved surface off the vertex of the paraboloid 1, and a primary radiator arranged at the focal point 3 of the paraboloid 1.

By the way, these types of parabolic antennas and offset antennas are installed in ordinary homes to receive satellite broadcasts, so the 7-rector is highly recommended for its low price and light weight for easy installation. It is requested.

(Prior Art and Problems) Conventionally, S7 rectors have been made of metal, synthetic resin and wire mesh combined, synthetic resin coated with a metal foil film, and fiber reinforced resin (CF) made of carbon fiber cloth.
RP) products are being considered. However, all of them have problems such as being heavy, rusting due to salt damage, poor weather resistance, high cost, and difficulty in processing curved surfaces.

(Objective of the Invention) The present invention solves the above-mentioned problems, and provides a cloth-like article made of fiber yarns made of a blend of polymeric conductive fibers and conductive fibers inside or on the surface of an i-fiber-reinforced resin. Each prefecture and cloth-like products are composites of cloth-like products made by mixing molecular conductive fiber threads and conductive fiber threads, or cloth-like products made by mixing polymeric conductive fiber threads and conductive fiber threads. The present invention aims to provide a 7-rector for a microwave antenna that is lightweight, has excellent weather resistance, is inexpensive, and can ensure practically sufficient reflection characteristics by appropriately setting the characteristics.

(Structure of the Invention) The first feature of the present invention is that a cloth-like material made of a fiber yarn made of a blend of conductive polymer W, fibers, conductive kfj, and fibers is composited inside or on the surface of the fiber reinforced resin. In this configuration, the electric resistance value of the i-miscellaneous light made by blending the polymeric conductive fiber and the conductive fiber is set to 0.5, Ω/10 cm or more, and 5 to Ω/10.
cm or less, the electrical resistance value between opposite sides of a square of 65 mm on each side of the cloth-like material is 0.05Ω or more and 50Ω or less, and the basis weight of the cloth-like material is 40H/m2 or more and 180B/
This is because it is set to less than m2.

A second feature of the present invention is that in a structure in which a cloth-like material in which a polymer conductive fiber yarn and a conductive fiber yarn are mixed is composited inside or on the surface of the fiber reinforced resin, the polymer The electrical resistance value of the conductive fiber thread is 0, and 5 when it is SkΩ/10cm or more.
The conductive wL fiber optical electrical resistance value is set to 0.5 and Ω/10 cm or less, and the cloth-like material 1
The electrical resistance value between opposite sides of a square with sides of 65 mm is 0.05.
Ω or more and 50Ω or less, and the basis weight of the cloth-like material is 40g.
/l112 or more and 180g/m2 or less.

Furthermore, the third feature of the present invention is that a cloth-like material made of fiber yarns in which polymeric conductive A-woven yarns and conductive fiber yarns are intertwisted is composited inside or on the surface of the fiber-reinforced resin. In the configuration, the electrical resistance value of the polymeric conductive microorganism is set to 0.5Ω.
/10cm or more and 5 and Ω/10cm or less, and the electrical resistance value of the conductive i-fiber is 0.5 and Ω/1. Ocn+
The electric resistance value between opposite sides of a square of 65 mm on each side of the cloth-like material is 0.05Ω or more and 50Ω or less, and the basis weight of the cloth-like material is 40 g/m2 or more and 180 g/spring2.
The settings are as follows.

(Embodiments of the Invention) Hereinafter, embodiments of the microwave antenna reflector according to the present invention will be described with reference to the drawings.

Example 1 As shown in Fig. 2, glass a forming the structural body of the +77 rector
Fiber-reinforced unsaturated polyester resin (hereinafter referred to as GFRP)
A cloth-like material 11 woven or knitted from fiber yarns made of a blend of polymeric conductive fibers and conductive fibers is provided on one side of the material 10 to serve as a radio wave reflecting surface, and furthermore, an unsaturated polyester material 11 is provided as a coating material. Established Delft 12,
The cloth-like material 11 is composited into GFRPIO. In this case, the thickness of the 7-rector will be about 5 mm. Here, the polymeric conductive fiber is made by bonding a conductive metal or metal compound (CuS, etc.) to the surface of acrylonitrile fiber, polyester, polyamide, etc., to exhibit conductivity as a whole. For example,
[Thunderon, 5S-NJ (trade name, manufactured by Nihon Kasuke Dyeing Co., Ltd.), etc. can be used. The conductive fibers are those that exhibit high conductivity, and are made of metals such as stainless steel, aluminum, iron (with anti-scratch coating), copper, brass, etc., or carbon fibers with a sheet resistance of 2 Ω/mm or less. There are some materials. In this example, the electric resistance value of the fiber yarn made by blending polymeric conductive fibers and conductive fibers was set to 0.5Ω/10c.
m or more and 5 and Ω/10 cm or less, and the electrical resistance value between opposite sides of the square of 65 mm on each side of the cloth-like material 11 is 0.0.
In other words, the sheet resistance value is 0.05 as 5Ω or more and 50Ω or less.
Ω/mouth ~ 50Ω/mouth), the basis weight of the cloth-like material is 40H/
Set at m2 or more and 180g/Tt12 or less.

FIG. 3 shows a method for measuring the electrical resistance value of the cloth-like material 11, in which the cloth-like material 11 is cut into a square with a side of 65 mm, and the opposite side A in the vertical direction is measured.

Using electrodes 2OA and 20B formed on B, the resistance value between both electrodes (that is, the sheet resistance value of the cloth-like material 11) was examined.

In the graph of FIG. 4, the chain line X indicates the basis weight (a spacing of This is a curve that shows the relationship between the reflection coefficient (the smaller the weaving interval, the larger the value) and the reflection coefficient.

In addition, the solid line Y is a curve showing the relationship between the basis weight and the reflection coefficient in the case of a cloth-like material (polymer conductive fiber cloth) consisting of polymer conductive M and fibers that do not contain conductive fibers. be.

From this Figure 4, the reflectance of cloth-like materials is proportional to the fabric weight, and in order to improve the reflection, the fabric weight must be increased and more threads must be used. In order to improve the reflective properties of conductive fiber cloth and to lower the basis weight, we use conductive fibers with high conductivity and blend them with polymer conductive fibers to create polymer conductive fibers. It is possible to obtain reflective properties equal to or better than that of a cloth-like material made only of natural fibers, with a lower basis weight. In other words, in the case of the solid line Y in which conductive fibers with high conductivity are not blended, the reflection coefficient is approximately 0.8 with a basis weight of approximately 60 g/m''; In the case of the chain line X, the reflection coefficient is approximately 0 when the basis weight is 40 g/m
．． It can be 8 or more. In addition, the basis weight is 180g
Even if it is larger than /l112, no improvement in reflection properties is observed, and in consideration of price and weight, it is preferably 180 g/m2 or less. In addition, the electric resistance value of the fiber yarn made by blending polymeric conductive fibers and conductive fibers is 5Ω/10em.
If it becomes larger, the reflection characteristics will be lower than in the case of the chain line X, and the effect of blending the conductive fibers will be reduced. If the blended I&fiber yarn 0.5 is made to have a resistance value lower than Ω/10cm, the yarn will become too thick, causing problems in processability and the like. Therefore, the electrical resistance value of a fiber yarn made by blending polymeric conductive fibers and conductive fibers is 0.
It can be said that it is desirable to set the value to 5Ω/10cm or more and 5Ω/10cm or less.

Example 2 In the configuration shown in Fig. 2, one cloth-like material was
It has a structure in which L fiber miscellaneous photoconductive fiber yarn is mixed, and the electrical resistance value of the polymer conductive fiber yarn is set to 0.5 Ω/10cn+
In the above, the electrical resistance value of the conductive fiber yarn is set to 0.5 to Ω/10 cm or less, and the electrical resistance value between opposite sides of the square of 65 mm on each side of the cloth-like material is set to 0.5.
05Ω or more and 50Ω or less, and the basis weight of the cloth-like material is 4
Set to 0g/m2 or more and 180g/lI+2 or less.

In this Example 2 as well, conductive fiber yarn with high conductivity was used as an auxiliary material to improve the reflection characteristics of the polymer conductive fiber cloth and to lower the basis weight. By mixing it with fiber yarn, it is possible to obtain reflective properties equal to or higher than that of a cloth-like material made of only conductive polymer fibers with a lower basis weight. That is, in the case of Example 2 as well, the characteristics shown by the dashed line X in FIG. 4 can be obtained.゛It should be noted that when the electrical resistance value of the polymeric conductive fiber yarn itself is greater than 5Ω/10cm, the reflection characteristics will be lower than in the case of the chain line X,
The effect of mixing conductive fiber threads is reduced. Further, if the polymeric conductive fiber yarn has a resistance value lower than 0.5 Ω/10 cm, the yarn becomes too thick, which causes problems in processability and the like. If the conductive wL fiber has a miscellaneous light of 0.5 kQ/10 cm, and the resistance value is too high, the effect of improving the reflection characteristics by mixed fibers will be reduced. Therefore, the polymer conductive wt fiber photoelectric resistance value is set to 0.5 to Ω/10 cm or more and 5 to Ω/10 cm or less, and the electrical resistance value of the conductive fiber yarn is set to 0.5 to Ω/10 cm.
It can be said that it is desirable to set it to 10 cm or less.

Example 3 In the structure shown in FIG. 2, the cloth-like material 11 is made of a fiber yarn obtained by intertwisting a polymer conductive fiber yarn and a conductive fiber yarn, and the electrical resistance value of the polymer conductive fiber yarn is O, SkΩ
/10cm or more and 5 to Ω/10cm or less, the conductivity m and the fiber optic electrical resistance value to 0.5 to Ω/10cm or less, and the distance between the opposite sides of the square of 65 cm on each side of the cloth-like material. The electrical resistance value is set to 0.05Ω or more and 50Ω or less, and the basis weight of the cloth material is set to 40g/m2 or more and 180g/m2 or less.

In this Example 3 as well, conductive fiber yarn with high conductivity was used as an auxiliary material to improve the reflection characteristics of the polymer conductive fiber cloth and to lower the basis weight. By intertwisting #& fibers, it is possible to obtain reflection characteristics equal to or higher than that of a cloth-like material made of only conductive polymer fibers with a lower basis weight. That is, in the case of Example 3 as well, the characteristics shown by the dashed line X in FIG. 4 can be obtained. In addition, when the electrical resistance value of the polymeric conductive fiber yarn itself is larger than 5Ω/10cm, the reflection characteristics will be lower than in the case of the chain line X,
The effect of twisting the conductive fiber yarns is reduced. Further, if the polymeric conductive fiber yarn has a resistance value lower than 0.5Ω/10cm, the yarn becomes too thick, which causes problems in processability and the like. Furthermore, the conductive fiber yarn is 0.
If the resistance value is higher than Ω/10cn+, the effect of improving the reflection characteristics due to twisted twisting will be reduced. Therefore, the electrical resistance value of the polymeric conductive fiber yarn is set to 0.5Ω/10cm or more and 5Ω/10cm or less, and the electrical resistance value of the conductive fiber yarn is set to 0.5Ω/10cm or less. It can be said that it is desirable to do so.

In the above embodiments, the cloth-like material may have a knitted, woven or non-woven structure, but knitting has the advantage that it is easy to form convex and concave surfaces by taking advantage of elongation.

(Effects of the Invention) As explained above, according to the microwave antenna reflector of the present invention, inside or on the surface of the fiber reinforced resin,
A cloth-like material made of a fiber yarn that is a blend of a polymeric conductive fiber and a conductive fiber, a polymeric conductive fiber yarn and a conductive w1. The properties of each group and the cloth-like material were set appropriately to create a composite of a cloth-like material mixed with fiber yarn or a cloth-like material mixed and twisted with polymeric conductive M&fiber photoconductive fiber yarn. , the following effects can be achieved.

(1) Since the main structure of the reflector is made of GFRP, it is lightweight and can have a specific gravity of 2 or less.

(2) It is rust-resistant, resistant to salt damage, and has excellent weather resistance.

(3) A cloth-like article made of a fiber yarn that is a blend of polymer conductive fibers and conductive fibers, a cloth-like article that is a mixture of polymer conductive i miscellaneous light and conductive fiber yarn, or a polymer conductive M& Since a cloth-like material mixed with fibrous photoconductive fiber threads is used as a member constituting the radio wave reflecting surface, it improves the reflective properties and has a lower basis weight than when using a simple polymeric conductive fiber cloth. It is possible to reduce the amount, and it is easy to obtain practically sufficient reflection characteristics (reflection coefficient of 0.9 or more).

(4) It can be manufactured by integral molding, etc., and is inexpensive.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a parabolic antenna and an off-seven antenna, Fig. 2 is a perspective view showing the structure of an embodiment of a seven-rector for a microwave antenna according to the present invention, and Fig. 3 is an explanatory diagram showing a cloth-like antenna. FIG. 4, which is an explanatory diagram showing the conditions for measuring the resistance value, is a graph showing the relationship between the basis weight and the reflection coefficient. 2, 4 =・IJ 7 and 99.10・GFRP, 11
...Cloth-like material. Takashi Murai, patent attorney and agent for patent applicant TDC Co., Ltd.

Claims (3)

[Claims] (1) A 7-rector for a microwave antenna in which a cloth-like material made of a fiber yarn made of a blend of polymeric conductive fibers and conductive fibers is composited inside or on the surface of a fiber-reinforced resin,
The electric resistance value of the fiber yarn blended with the polymeric conductive fiber and conductive fiber is 0.5Ω/10cm or more and 5Ω.
/10cm or less, the electrical resistance value between opposite sides of a square of 65 mm on one side of the cloth-like material is 0.05Ω or more and 50Ω or less, and the basis weight of the cloth-like material is 40g/m2 or more and 18
A 7-rector for microwave antennas characterized by being set to 0g/m2 or less. (2) A 7-rector for a microwave antenna in which a cloth-like material in which a polymeric conductive fiber thread and a conductive fiber thread are mixed is composited inside or on the surface of a fiber-reinforced resin, the polymer The electrical resistance value of the conductive fiber thread is set to 0.5 to Ω/10cm or more and 5 to Ω/10cI11 or less, and the electrical resistance value of the conductive fiber thread is set to 0.5 to Ω/10em or less, and the cloth-like article The electric resistance value between opposite sides of a square of 65 mm+ on one side is set to 0.05Ω or more and 50Ω or less, and the basis weight of the cloth-like material is set to 40g/m” or more and 180g/m2 or less. 7 rectors for microwave antennas. (3) A 7-rector for microwave antenna in which a cloth-like material made of a fiber yarn made by intertwisting a polymeric conductive fiber yarn and a conductive fiber yarn is placed inside or on the surface of a fiber-reinforced resin. Then, the electrical resistance value of the polymer conductive wL fiber is O,S
kΩ/10cm or more and 5 to Ω/10cm or less, the electrical resistance value of the conductive fiber yarn is 0.5 to Ω/10cT6 or less, and the electrical resistance between opposite sides of the square of 65IIIO on one side of the cloth-like material. The value is 0.05Ω or more and 50Ω or less, and the basis weight of the cloth is 40g/m2 or more and 180g/m2.
A 7-rector for microwave antennas characterized by being set to +n" or less.