JPH08596U - Loop antenna device - Google Patents

Abstract

(57) [Abstract] [Purpose] While reducing the weight of the loop antenna device,
The effort of adjusting the broadband sensitivity improving circuit is simplified. [Structure] Carbon fiber-containing epoxy synthetic resin strip tapes are attached to the front and back of the core layer of the glass fiber-containing epoxy synthetic resin strip with epoxy synthetic resin material, and a coating film layer of enamel coating is applied to the entire outer surface. Create a resistive antenna element. This antenna element is curved against its elasticity and the carbon fibers at both ends of the element are exposed to form a terminal portion, thereby forming a loop antenna.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a loop type antenna device used for a wireless direction finder.

[0002]

[Prior art]

 Such loop antenna devices include shield type devices in which the antenna element is made of wire and placed inside a shield tube, and bare type in which the antenna element is made of a rod-shaped or plate-shaped metal body and exposed naked. There are some.

A bare loop antenna device in which an antenna element is formed of a strip-shaped metal plate is well known from Japanese Utility Model Publication No. 55-52375. A loop antenna device with a sense antenna / counterpoise in which a sense antenna for unidirectional determination and a counterpoise with a horizontal ring for phase stabilization in the VHF / UHF band are assembled to the loop antenna is a special feature of the present applicant. There is a wish 60-84092.

Since such a loop antenna device is installed mainly on the top of a mast of a ship, which often vibrates, in order to avoid a detection error due to the influence of surrounding structures, it is strong in terms of earthquake resistance and salt damage. And it must have a lightweight structure. For this reason, the antenna element portion is made of a corrosion-resistant aluminum alloy, and the base (base pedestal) portion holding it is made of a corrosion-resistant aluminum alloy or FRP (reinforced polyester synthetic resin) material.

Further, in order to improve the sensitivity in a specific frequency range, the loop antenna element circuit itself is caused to resonate in the vicinity of its frequency band, and a wide band sensitivity is added by which a resistance is added to slow down this co-seismic band. Improvement circuit is applied. In a loop antenna having two orthogonal loops, the electronic imbalance of this circuit between the loop antennas has a great influence on the direction finding accuracy, so it has been carefully adjusted.

[0006]

[Problems to be solved by the device]

 Recently, even medium-sized ships have been made into FRP ships, and the hull itself has become extremely lightweight, so even a slight heavy object on the mast will have a great adverse effect on the hull's sway and overturning limits. Furthermore, quantification is required.

On the other hand, at the time of cargo handling work at the port, even if a part of the cargo handling machine touches the antenna element very lightly and slightly, it will be deformed immediately and cause a direction finding error. Is required to do so. Moreover, adjustment of the above-mentioned wideband sensitivity improving circuit requires a lot of work, and there are many demands such as simplification of the demand. Therefore, these demands can be solved at once. There is a problem that the emergence of loop antenna technology is expected.

[0008]

[Means for Solving the Problems]

 According to the present invention, each of the above problems is solved by means of forming the above loop antenna element by bending a belt-shaped plate of synthetic resin material containing carbon fiber having low resistance and conductivity against its elasticity. It is something that can be solved.

[0009]

【Example】

 Embodiments will be described below with reference to the drawings. In the figure, FIG. 1 shows a strip-shaped plate 1 of a carbon fiber-containing synthetic resin material for forming an antenna element and thin conductor plates 3 for terminals to be attached to both ends thereof. The strip-shaped plate 1 is formed in a linear shape. Then, the terminal surfaces 2 are provided on the respective surface portions at both ends thereof.

As shown in FIG. 2, the cross section of the base material of the strip-shaped plate 1, that is, the cross section taken along the line ii, has the core layer T1 of the strip-shaped plate of glass fiber-containing epoxy synthetic resin material arranged at the center, and both sides The surface layer T2 of the tape tape made of epoxy synthetic resin material containing carbon fiber is attached to the side with epoxy synthetic resin material to form a single strip plate, and the coating layer T3 of enamel coating is applied to the entire outer surface. . Then, the glass fiber of the core material layer T1 is formed in a fibrous shape, and the carbon fiber of the skin layer T2 is formed in a parallel shape aligned in the longitudinal direction of the strip plate 1 as the carbon fiber direction D1 of FIG. There is. As shown in Fig. 4, the surface of the terminal surface 2 is roughened by scratching the front and back surfaces in the direction D1 and the direction D2 perpendicular to the carbon fiber to expose the carbon fiber on the surface, and then the conductive material such as acrylic synthetic resin paint containing nickel powder is used. A paint is applied to form a conductive contact layer T4, and its cross section, that is, a cross section along the line is formed as shown in FIG. Then, a mounting hole P1 for fixing is provided in this portion, and as will be described later, it is assembled to the base (base pedestal) portion 10 to form an output takeout terminal portion.

As the thin conductor plate 3, a thin conductor plate made of a thin stainless plate or a thin copper plate plated with nickel is spread over the length l of the terminal surface 2 at both ends of the strip 1. It has a contacting surface at the top and bottom and both sides are connected at the side, for example, it is formed by bending into a horizontally long U-shape as shown in FIG. 6, and a mounting hole P 2 corresponding to the hole P 1 is provided. is there.

In the assembly described later, the thin conductor plate 3 increases the contact surface with the terminal surface 2 of the strip-shaped plate 1 and short-circuits both upper and lower terminal surfaces 2 for parallel connection, and the antenna element itself This is useful for lowering the conductivity of the device, reducing the contact resistance for extracting the antenna output at this assembly part, and eliminating their variation.

The terminal surface pressing member 4 is made of a conductive material such as a stainless material or a copper plate plated with nickel, and the lower side surface, that is, the lower surface is formed with a radius R of the loop circle of the antenna element. In the later-described assembly, a mounting hole P4 corresponding to the hole P1 is provided with a thickness h sufficient to contact the terminal surface 2 and to withstand the terminal surface 2 forcibly.

FIG. 7 shows a procedure for forming the strip-shaped plate 1 on the antenna element and assembling it to the base pedestal 10, and FIG. 8 shows the assembled state. The strip-shaped plate 1 is formed on a straight line as shown in FIG. 1. However, when the portion slightly inward of the terminal surface 2 is curved with both hands in a ring shape against the elasticity, the elasticity of the strip-shaped plate 1 is reduced. A natural ring shape repelled by rigidity, that is, a loop shape as shown in FIG. 7, can be formed as an antenna element of a loop antenna.

When the thin conductor plate 3 is covered on the terminal surface 2, the terminal surface pressing metal fitting 4 is applied to the upper surface side, and the screw S1 is passed through the holes P1, P2, P4 and tightened to the mounting seat 5, The upper surface of the seat 5 is the radius R of the loop circle of the antenna element (more precisely, the radius of R plus the thicknesses of the strip plate 1 and the thin conductor plate 3 but also R Since it is formed with almost no change), it means that a loop-shaped antenna element having a target size is assembled to the base pedestal 10.

The base pedestal 10 is made of an FRP material with a structure that can be disassembled into a lid 6 and a receiving seat 8 at the mating position 7, and is arranged alternately with the mounting seats 5 with a packing W1 interposed. A watertight chamber is formed by tightening together with the screw S5, and a flange (not shown) provided on the top of the mast of the ship or the steel tower of the ship by the mounting screw 9 protruding to the lower end surface side of the seat 8. Fixed) to support. The mounting seats 5 are formed on the upper surface side of the base pedestal 10 by projecting a required number (in the case of the figure, four antennas are radiated at 90 ° intervals because they are orthogonal loop antennas) and are embedded inside for the screws S1. The metal fittings 11 and 11 'are embedded, and one of the metal fittings 11 is projected downward to serve as an electrode for extracting the antenna output, and a printed wiring board 12 for an accessory circuit is attached thereto by a screw S4.

In the center of the lid body 6, a boss C1 is projected, and in the recessed hole, a metal fitting 13A at the lower end of the pillar 13 formed in the shape of a hollow cylinder made of an insulating material such as FRP or the like is provided with a screw S3 via a packing W2. The column 13 is held by tightening and fixing with. A receiving seat 14 made of an insulating material such as FRP is fixed to the upper end of the column 13, and the top portion of the strip-shaped plate 1 is inserted and held in the recessed hole Q1 for the strip-shaped plate 1 provided on the upper surface thereof. , The strip-shaped plate 1 ′ for forming the antenna element on the crossing side indicated by the chain line is curved and arranged in the same manner as the strip-shaped plate 1 described above, and both ends of the strip-shaped plate 1 ′ are mounted in the same manner as the strip-shaped plate 1 described above. After assembling and fixing to the ′ ′, the pressing lid 15 made of an insulating material such as FRP is arranged on the upper side, and the recessed portion Q2 for the zonal plate 1 ′ provided on the lower surface side of the top part of the zonal plate 1 ′. Is inserted and held, and the pressing lid 15 is tightened and fixed to the receiving seat 14 with the screw S2. By this fastening and fixing, the apex intersection points of the strip-shaped plate 1 and the strip-shaped plate 1 ′ are clamped by the receiving seat 14 and the pressing lid 15.

In the case of an antenna configuration including the sense antenna 16, holes P3 and P3 ′ are formed at the center points of the strip-shaped plates 1 and 1 ′, and holes P7 and P9 are formed at the centers of the receiving seat 14 and the push cover 15, respectively. Each of them is provided with the sense antenna 16 inserted from above, and the lower end of the sense antenna 16 is inserted into the recessed hole 13B provided on the upper end side of the fitting 13A through the support column 13 and fixed by the screw S6 to be integrally assembled. . The sense antenna 16 has a conductor wire which is passed through a thin tubular body made of an FRP material, and is electrically connected to a mounting metal fitting provided at the lower end.

Each dimension in each drawing shows the actual size in mm even though the diameter of the loop is 600 mm when the loop antenna is used for the frequency band of 27 MHz.

The electrical characteristics of the strip-shaped plate 1 itself are determined so that the conductive resistance between the terminal surfaces 2 at both ends of the skin layer T2 is as low as about 6Ω for both the upper skin layer and the lower skin layer. In addition, the upper and lower skin layers are connected in parallel with each other by the above-mentioned terminal part assembly structure to have a resistance of about 3Ω, and the contact resistance in the terminal part assembly itself is negligible. I try to get the continuity of.

[Modified Implementation] The present invention can be modified and implemented as follows. (1) It is required that the antenna is composed of only one loop antenna, that is, the one having only the strip plate 1 in FIG.

(2) The upper sides of the embedded metal fittings 11 and 11 ′ are exposed on the upper surface side of the mounting seat 5, and the upper surface thereof is formed along the lower surface of the thin conductor plate 3 to form the thin conductor plate 3 of FIG. The upper and lower separate layers are formed by removing the horizontal joints, and the upper and lower surface layers T2 are connected in parallel as in the assembly of FIG. .

(3) The upper ends of the embedded metal fittings 11 and 11 'are formed in the same manner as in (2) above, the thin conductor plate 3 is left as it is in FIG. 6, and the terminal surface pressing metal fitting 4 is made of FRP or the like. It is formed of the insulating material of FIG. 7 and is configured so that the same conductive connection effect as that of the assembly of FIG. 7 can be obtained.

(4) When the upper surface of the mounting seat 5 and the lower surface of the terminal surface pressing metal fitting 4 are planes and are appropriately inclined surfaces, for example, planes having an inclination of the tangent line of the diameter circle of the loop antenna, , The deformation stress applied to the terminal surface 2 and the thin conductor plate 3 is eliminated, and the conductive contact effect is improved.

(5) The upper surface of the mounting seat 5 and the lower side surface of the terminal surface pressing metal fitting 4 are made into a flat surface having a horizontal surface or an inclination close to the horizontal surface or a curved surface close to the horizontal surface, and the loop shape is an elliptical shape that is flat in the horizontal direction. Or make them close to the vertical direction and configure the loop shape as a flat elliptical shape in the vertical direction.

(6) The skin layer T2 of the carbon fiber-containing epoxy synthetic resin band tapes formed on both the front and back surfaces of the band-shaped plate 1 has only one of the upper side and the lower side, and the thin conductor plate 3 is one flat plate. Configure as a face plate.

(6) The tubular portion 13C of the column 13 is made of glass fiber-containing epoxy synthetic resin on the inside, and a carbon fiber-containing epoxy synthetic resin material is wound around the outside thereof to form each fiber into a fibrous shape. By doing so, the seismic strength of the column 13 is improved.

(7) The base pedestal 10 is formed by integrating the lid body 6 and the receiving seat 8 that cannot be disassembled at the mating position 7 to form an inexpensive structure.

(8) When the sense antenna 16 is provided, the sense antenna 16 is formed of a carbon fiber-containing epoxy synthetic resin rod or tube.

(9) In the case where a counterpoise with a horizontal ring for phase stabilization as shown in chain line in FIG. 3 is assembled to form the above-mentioned Japanese Patent Application No. 60-84092, the horizontal ring The stub ring 17 is formed of the same material as the strip plate 1.

(10) A counterpoise 18 protruding from the counterpoise with a horizontal ring for phase stabilization of the above (9) is formed in the same manner as the sense antenna 16 of the above item (8).

(11) By changing the electrical characteristic conditions of the carbon fibers forming the strip plate 1, the conduction resistance value between the terminal faces 2 at both ends of the strip plate 1 can be further reduced, and the one suitable for a low frequency band can be obtained. Alternatively, on the contrary, the resistance value is increased to be suitable for widening the band in a high frequency band.

[0033]

[Effect of device]

 According to the present invention, as described above, the strip-shaped plate 1 is formed by the strip-shaped plate of the carbon fiber-containing synthetic resin material having the low resistance conductivity, and the strip-shaped plate 1 is curved against the elasticity of the loop antenna. Since the antenna element is formed, the antenna device becomes extremely lightweight, and even in the case of a small boat, its center of gravity is not increased, which does not adversely affect the shaking and the sideways limit. Since the original shape is restored only by instantaneously deforming it when touched, there is no possibility of causing a direction error due to deformation of the antenna element as in the conventional case.

Further, the surface of the strip-shaped plate 1 is roughened to expose the carbon fibers, and conductive contact is made good by means of a terminal surface forming means such as applying a conductive paint to the carbon fibers. In addition to providing the desired characteristics, in the case of a high frequency band, by providing the strip-shaped plate 1 with an appropriate low resistance, a complicated circuit for widening the band can be formed in the printed wiring board 12 as in the conventional case. It is possible to eliminate the troublesome adjustment work for installing or balancing the circuit constants.

Furthermore, since the antenna element is linear like the strip plate 1, if it is packaged and transported in the disassembled state before assembly, and the means for assembling at the site is taken, the transportation cost of the conventional 3 is used. It has a feature that it can be reduced to 1/5.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts.

FIG. 2 is a cross-sectional view of the parts of the main part

FIG. 3 is a cross-sectional view of essential parts

FIG. 4 is a plan view of essential parts

FIG. 5 is a front view of essential parts.

FIG. 6 is a cross-sectional view of essential parts

FIG. 7 is a perspective view of an assembling procedure.

FIG. 8 is a vertical sectional view of the assembled state.

[Explanation of symbols]

 1 band-shaped plate 2 terminal surface 3 thin conductor plate 4 terminal surface pushing metal fitting 5 mounting seat 6 lid 7 mating position 8 receiving seat 9 mounting screw 10 base pedestal 11 embedding metal fitting 12 printed wiring board 13 strut 14 receiving seat 15 push lid 16 sense antenna 17 stub ring 18 counterpoise

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Nomoto Yoshinomoto 1-17-71 Nishihashimoto, Sagamihara City, Kanagawa Prefecture

Claims (5)

[Scope of utility model registration request] 1. A loop antenna device, wherein the antenna element is formed by bending a belt-shaped plate made of carbon fiber-containing synthetic resin material having low resistance and conductivity against the elastic force. 2. The loop antenna device according to claim 1, wherein surfaces of both ends of the strip plate are roughened to expose the carbon fibers, and a conductive paint is applied to the terminal faces for output extraction. A loop antenna device comprising terminal surface forming means for forming a loop. 3. The loop antenna device according to claim 1, wherein carbon fiber arranging means for arranging the carbon fibers on both surface sides of the strip plate to form the strip shape, and front and back surfaces of both ends of the strip plate. A loop antenna device comprising: front and back terminal surface forming means for roughening both surfaces to expose the carbon fibers and applying a conductive coating to form terminal surfaces for output extraction on the front and back surfaces. 4. The loop antenna device according to claim 1, wherein a carbon fiber arranging means for arranging the carbon fibers on both front and back surfaces of the strip-shaped plate to form the strip, and front and back surfaces of both ends of the strip-shaped plate. Front and back terminal surface forming means for forming a terminal surface for output extraction by applying a conductive coating on the both surfaces to expose the carbon fiber, and each contacting each terminal surface formed on the front and back. A loop antenna device, comprising: a thin conductor plate adhering means for forming a take-out terminal surface by covering the both ends with a thin conductor plate having continuous contact surfaces. 5. The loop antenna device according to claim 1, wherein the strip-shaped plate is packed and transported in the form of a plate, and the strip-shaped plate is curved to form a loop at a mounting site of the loop antenna device. A loop antenna device, characterized by comprising on-site assembling means for assembling the base base.