JPH0221769Y2 - - Google Patents

Description

[Detailed description of the invention] The invention of the present application aims to solve the following problems.

(Industrial Application Field) This invention relates to a folded dipole used for transmitting and receiving radio waves.

(Prior art) Conventional folded dipoles made of aluminum have problems such as poor corrosion resistance and low strength, causing them to bend when handled.
Additionally, those made of stainless steel, which has high corrosion resistance and strength, are heavy and require a sturdy support to install them. In order to eliminate the above problems, the dipole is constructed from two parallel main members and a U-shaped curved member that connects their tips to each other, and they are also made of carbon fiber reinforced resin and are integrally integrated with each other. A configuration has been devised in which the two are connected. However, in such a device, the forming precision of the curved member is low and the parallelism of the main body member tends to be poor, resulting in a problem that the electrical characteristics as a dipole are deteriorated.

(Problems to be solved by the invention) This invention aims to eliminate the above-mentioned conventional problems and provide a folded dipole that has high corrosion resistance and strength, is lightweight, and also has good electrical characteristics. .

The configuration of the present invention is as follows.

(Means for Solving the Problems) The present invention takes the measures as described in the claims above, and its effects are as follows.

(Function) The carbon fibers of the main body are electrically connected to the connecting portion through the conductive paint applied to the tip surface of the main body.

(Example) Below, drawings showing examples of the present application will be described. FIG. 1 shows the main parts of the antenna: 1 is a radiator, 2 is a composite waveguide, 3 is a waveguide, and 4 is a reflector, each of which is attached to a boom 5. Next, in the above radiator 1, 6 is the boom 5
This is a power supply section attached to the main body, and is constructed with a power supply box made of synthetic resin material. 7 is a U that is attached to the left and right sides of the power supply box 6 in an overhanging manner.
A letter-shaped radiating element is shown. Each of the radiating elements 7 has two straight main bodies 40 arranged parallel to each other.
and a U-shaped connecting portion 41 that connects the free ends of the main body portions 40 to each other. As shown in FIGS. 2 and 4, the main body portion 40 is formed into a hollow cylindrical shape using a carbon fiber reinforced resin made by hardening a large number of carbon fibers 8 with a resin 9.
The amount of the carbon fibers 8 is preferably 60% or more in terms of volume content. These carbon fibers 8 are arranged long in the longitudinal direction of the main body portion 40, and each carbon fiber 8 is electrically independent from each other. Also,
As the resin 9, thermosetting polyester resin, poxy resin, polyimide resin, thermoplastic polyamide resin, vinyl chloride resin, etc. are used.

The free end portion of the main body portion 40 is provided with a fitting hole 42 and an annular cutout portion 43, respectively. Note that the outer diameter of the main body portion 40, the diameter of the fitting hole 42, and the diameter of the cutout portion 43 are, for example, 13 mm, 10 mm, and 11.5 mm, respectively. Next, the connector 41 is connected to the main portion 44 made of a conductive metal material (for example, an aluminum pipe).
4 is provided with a protective layer 45 for protecting it from corrosion. As the protective layer 45, for example, epoxy resin is used. The end portion of the main portion 44 protrudes beyond the protective layer 45, and the protruding portion serves as an insertion portion 46 for the fitting hole 42. 47 indicates an annular cutout. In addition, the above connection part 4
The outer diameter of 1, the outer diameter of the main portion 44, the inner diameter of the main portion 44, the diameter of the cutout 47, and the length of the insertion portion 46 are, for example, 13 mm, 10 mm, 8.4 mm, 11.5 mm, and 40 mm, respectively.
48 is a conductive paint, which covers the end surfaces 40a, 4 of the main body 40.
0b, the peripheral surface of the missing portion 43, the inner surface of the fitting hole 42, and the outer surface of the insertion portion 46 are continuously coated. Any known conductive paint 48 can be used as it has extremely low resistance to high frequencies. 49 is the missing part 43,
47, and is used to mechanically and firmly connect the free end of the main body 40 and the end of the connecting part 41, and to form it, glass fiber and epoxy resin are used. The missing part 4 is a mixture of
3, 47 and solidify there, or the above-mentioned mixture is made into a sheet to fill the missing part 4.
For example, a method is used in which the material is wound around the material 3, 47 and then solidified by heat treatment.

Next, in the power supply box 6, the main body 10 is manufactured by molding a synthetic resin material such as ABS or polypropylene. In this main body 10, 11 is a bottom plate, 13 is a boom contact piece, 14 is an annular side wall, and a female thread 17 of a lid 16 is screwed into a male thread 15 formed above the outer peripheral surface.
Next, reference numeral 18 denotes an element mounting portion, which is constructed as shown in FIGS. 3 and 4. In this element mounting portion, reference numeral 19 denotes a holder formed on the main body 10 of the power supply box 6, and two holders are formed on each of the left and right sides of the main body 10 so as to penetrate through the side wall 14. This holder 19 is formed into a cylindrical shape having an opening hole 20 opened at the outer end.
The inner end of 0 is closed by a closing wall 21. The inner diameter of the opening hole 20 is formed to have substantially the same size as the outer diameter of the main body portion 40 of the radiating element 7,
The base of the main body portion 40 is inserted into the interior thereof. Reference numeral 22 designates an annular engaging portion formed protruding from the closing wall 21, and is abutted by a pressing portion to be described later. 2
3 is a mounting hole formed in the peripheral wall of the holder 19. Reference numeral 24 denotes an abutting surface formed on the end surface of the main body 40 of the radiating element 7 on the base side, and is formed into a tapered surface as shown. The ends of the carbon fibers 8 are exposed on this contact surface 24 . Reference numeral 25 denotes a mounting hole formed at the base of the main body portion 40, and is formed at a position overlapping with the mounting hole 23. Reference numeral 26 denotes a cylindrical connector that is press-fitted into the opening hole 7a of the main body portion 40 of the radiating element 7, and is made of a conductive material. Reference numeral 27 denotes a conductive pressing portion integrally formed at the end of the connecting device 26, which is formed into a funnel shape by pressing so as to protrude toward the outer periphery of the connecting device 26 and face the abutting surface 24. has been done. The abutting surface 27a of the abutting portion 27 closely abuts the carbon fiber 8 of the abutting surface 24, so that the abutting portion 27 and the carbon fiber 8 are electrically well connected. Reference numeral 29 denotes a mounting hole formed in the connector 26, which is similar to the mounting hole 2 described above.
3,25. 30
is a conductive terminal plate located on the outer peripheral side of the holder 19, and is attached to each holder 19. A power supply line for signal transmission is electrically and mechanically connected to this terminal board 30. 34 is the terminal plate 30, the holder 19, the radiation element 7, and the connector 2
6 is shown.

In the antenna with the above configuration, the terminal plate 30, the carbon fiber 8 of the main body part 40, and the main part 44 of the connecting part 41
Since there is a good electrical connection between the two, radio waves can be transmitted and received well. That is, the pressing part 27
contacts the carbon fiber 8 exposed on the contact surface 24 and is electrically connected well, so the terminal plate 30
is electrically connected to the carbon fiber 8 through the fastener 34, the connector 26, and the pressing portion 27. On the other hand, in the connecting part between the main body part 40 and the connecting part 41, a large number of carbon fibers 8 exposed on the end surfaces 40a and 40b are electrically connected to the conductive paint 48, and the conductive paint 48 is connected around the insertion part 46. The carbon fibers 8 are electrically connected to the main portion 44 of the portion 41, and as a result, the large number of carbon fibers 8 are electrically connected to the main portion 44 in a good manner.
As a result of the good electrical connection between the terminal plate 30, the carbon fibers 8, and the main portion 44, the above-mentioned transmission and reception can be performed well.

(Effects of the invention) As described above, when the present invention is used outdoors, since the main body part 40 is made of carbon fiber reinforced resin, it has high corrosion resistance against rain and dust particles and has a long life. It has many advantages, such as being strong and durable against strong winds, being light in weight, and having a simple supporting structure. Moreover, even if the main body part 40 is made of carbon fiber reinforced resin, the connecting part 41 is made of metal, so it will not fit within the predetermined U.
It has structural features that allow it to bend correctly into the shape of a letter, to be able to connect with the mutually parallel main body parts 40 without difficulty (connection can be made while maintaining the correct parallelism of the main body parts), and to have good electrical characteristics as a folded dipole. be.

Further, as described above, the main body portion 4 made of carbon fiber reinforced resin
0 and the metal connection part 41, in the connection part between the two, first, a large number of carbon fibers in the main body part are electrically connected together with the conductive paint 48 on the end surface. At the same time as it continues to be coated with conductive paint 48, the connection portion 4
1, the large number of carbon fibers and the connecting portion 41 are connected with good conductivity, and have the effect of exhibiting better electrical characteristics as a folded dipole.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a partially omitted perspective view of the antenna, FIG. 2 is an enlarged horizontal sectional view of the portion, and FIG. 3 is an enlarged vertical sectional view of the portion.
FIG. 4 is an enlarged sectional view of the part. 6... Power feeding part, 40... Main body part, 8... Carbon fiber, 41... Connection part, 48... Conductive paint.

Claims (1)

[Scope of utility model registration request] Two main bodies of linear elements are made to protrude from each of the left and right sides of the power feeding part, and the two main bodies on each side are positioned parallel to each other, and further, on each of the sides, In the folded dipole, each free end of the two main parts is connected to one end and the other end of a U-shaped connecting part, respectively, and the main part has a large number of carbon fibers embedded in the resin. On the other hand, the connecting part is composed of a main part made of a conductive metal material and a protective layer provided around the main part. , Furthermore, the connection structure between the free end of the main body and the end of the connection part is as follows:
The free end of the main body is formed into a cylindrical shape, into which the end of the main body in the connection part is inserted, and a conductive paint is applied to the tip surface of the free end of the main body. and a conductive paint is applied from the coated surface to the outer periphery of the end of the main part in the connection part to establish electrical continuity between the carbon fibers of the main part and the end of the main part in the connection part, Furthermore, the folded dipole is characterized in that the outer periphery of the free end of the main body portion and the end of the connecting portion is covered with a connecting member.