JPH01202903A - Non-directional antenna within horizontal plane - Google Patents

Abstract

PURPOSE:To make the weight of a main reflection mirror light and to facilitate the assembling and adjustment of the antenna by forming the main reflection mirror from a dielectric substance incorporatedly from a supporting cylinder and metalling the surface of the dielectric so as to form the reflecting face. CONSTITUTION:An electromagnetic horn 12 is fitted to a supporting cylinder 10 made of a metal such as aluminum and a waveguide connected to a transmitter-receiver is interposed in the electromagnetic horn 12. A structure 25 with a main reflection mirror 26 having conical parabolic face of rotation and a dielectric supporting cylinder 24 formed incorporatedly is fixed to the metal-made supporting cylinder 10 by a tightening means such as bolts. The structure 25 is made of a dielectric substance such as polycarbonate or glass fiber reinforced polyester, and the reflecting face 26a is formed by cutting or casting using a die to assure sufficient accuracy with respect to an ideal curve and by applying metallizing to the surface through the coating or plating of a conductive material thereto. Thus, the error in the setup of the main reflection mirror is reduced and formed incorporatedly, then high airtightness is ensured.

Description

[Detailed Description of the Invention] Overview The present invention relates to an omnidirectional antenna in a horizontal plane for communicating between a central station and a large number of stator stations scattered around the central station or mobile stations moving in a horizontal plane. The aim is to provide an omnidirectional antenna in the horizontal plane that can reduce the weight of the reflector and allow easy assembly and adjustment of the antenna. In an omnidirectional antenna in a horizontal plane having a main reflecting mirror having a reflecting surface, the one-sided 0A81 is formed integrally with a support cylinder from a dielectric material, and the reflecting surface is formed by metallizing the surface of the dielectric material.

INDUSTRIAL APPLICATION FIELD The present invention relates to an omnidirectional antenna in a horizontal plane for communicating between a central station and a large number of stator stations scattered around the central station or mobile stations moving in a horizontal plane.

When communicating with subscribers who move in a plane that is approximately horizontal to the central station, a tracking device is required when using a parabolic antenna because the directivity is sharp. Furthermore, when communicating with a large number of sub-stations scattered in a substantially horizontal plane, the central station requires a large number of antennas corresponding to the sub-stations. In such a case, if an omnidirectional antenna in the horizontal plane is used at the central station, there is no need to track the slave stations, and there is no need to deploy multiple antennas at the central station. Since this antenna is omnidirectional in the horizontal plane, the central station can cover 360° around it, selectively transmitting information to all subscribers within a given path 11 (e.g. 5 contacts) from the central station. Alternatively, wireless transmission can be performed simultaneously. The microwaves sent from the central station are received by, for example, a horn antenna provided on the access side.

In addition, an omnidirectional antenna in the horizontal plane is installed on an unmanned moving vehicle in a warehouse or yard, and the image information recognized by the moving vehicle is transmitted by this antenna in the microwave band. By receiving image information using a wide-angle horn antenna or the like and displaying the image information on a display, it is possible to observe the surrounding situation of the unmanned moving vehicle from the comfort of your own home. In addition, this unmanned moving vehicle can be controlled because if a signal is transmitted by a horn antenna installed at a predetermined location, this signal can be received by a horizontal omnidirectional antenna no matter where the unmanned moving vehicle is located. , can be easily achieved on the operator's side.

BACKGROUND ART FIG. 3 shows a vertical cross-sectional view of a conventional non-directional antenna in a horizontal plane, and 10 is a metal support cylinder made of metal such as aluminum. An electromagnetic horn 12 is provided within the metal support cylinder 10, and a waveguide (not shown) connected to a transmitting/receiving device is interposed within the electromagnetic horn 12. A dielectric support cylinder 14 made of polycarbonate or glass fiber-filled polyester is attached by fixing means such as bolts. 16 is a substantially conical paraboloid of revolution or a modified paraboloid of revolution. It is a conical paraboloid of revolution main reflecting mirror with a reflection surface 16a as a circulation surface, and is joined to the dielectric support cylinder 14 at a joint portion 20 at its upper end.The conical paraboloid of revolution main reflected light 16 is e.g. It is made of metal such as aluminum. 18 is a cover for preventing dirt, snow, etc. from entering.

The radio waves radiated from the electromagnetic horn 12 are reflected by the conical paraboloid of revolution main reflecting mirror 16 and radiated in the horizontal plane, and are non-directional in the horizontal plane.

Problems to be Solved by the Invention However, in the conventional horizontal plane omnidirectional antenna having the structure described above, the conical paraboloid of revolution main reflector 16 is joined to the dielectric support cylinder 14 at the joint portion 20. Therefore, in order to maintain high antenna characteristics, high precision is required for attachment at this joint portion 20. Therefore, careful attention had to be paid to the processing and installation of this part. In addition, since the antenna is usually used outdoors, etc., in order to prevent the intrusion of rainwater etc. at this joint part 20, for example, 0-
It was necessary to perform an airtight treatment using a ring or the like.

The present invention was made in view of the above points, and its purpose is to provide an omnidirectional antenna in the horizontal plane that can reduce the weight of the main OA mirror and that allows easy assembly and adjustment of the antenna. It is to provide.

Means for Solving the Problem The main reflecting mirror 26.36 is formed integrally with the supporting cylinder 25.35 from a dielectric material, and the reflecting surface 26a.

The above-mentioned problems are solved by forming 35aG by metallizing the dielectric surface.

Function: Since the main reflecting mirror and the dielectric support cylinder are integrally formed in the present invention, errors in setting the main reflecting mirror can be reduced, and there is no need for airtight treatment between the main reflecting mirror and the supporting cylinder.
Since it is integrally molded, high airtightness is naturally achieved. Also, since the reflecting mirror is made of dielectric material, it is lightweight. Furthermore, the number of parts is reduced, and assembly and adjustment become easier.

辷-”L-μ Embodiments of the present invention will be described in detail below based on the drawings.

In the description of the embodiment, the same components as those in the conventional structure shown in FIG. 3 will be described with the same reference numerals.

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, in which an electromagnetic horn 1 is mounted on a metal support cylinder 10 made of aluminum or the like.
2 is attached to the electromagnetic horn 12, and a waveguide (not shown) connected to a transmitting/receiving device is interposed within the electromagnetic horn 12. The metal support cylinder 10 has a structure 2 formed integrally with a conical paraboloid of revolution main reflecting mirror 26 and a dielectric support cylinder 24.
5 is fixed by fastening means such as bolts. The structure 25 is made of a dielectric material such as polycarbonate or glass fiber-containing polyester, and the reflective surface 26a is formed by cutting so as to have sufficient precision with respect to an ideal curve, or by casting using a mold. It is formed by applying a conductive paint or plating the surface to metallize it. 28 is a cover for preventing the intrusion of rainwater, snow, etc.
It is attached to the top surface of 5. In this example,
A reflective surface 26a is formed inside.

FIG. 2 is a longitudinal sectional view of another embodiment of the present invention, which differs from the embodiment shown in FIG. 1 in that a reflective surface 36a is formed on the outside. That is,
Inside the dielectric support: R34 and the cylindrical paraboloid of rotation reflection chain 36
A structure 35 formed integrally with the metal support cylinder 10 is fixed to the metal support cylinder 10 by fastening means such as bolts. Reflective surface 36
A is formed on the outside with high precision using cutting, molding, etc., and is completed by metallization. 38 is a cover for preventing rainwater, snow, etc. from entering.

Effects of the Invention Since the omnidirectional antenna in the horizontal plane of the present invention is configured as detailed above, it is possible to reduce errors when setting the main reflecting mirror, and eliminates the need for airtight treatment between the 1.0 mm T14 mirror and the supporting cylinder. Since it is integrally molded, high airtightness is naturally achieved. Furthermore, since the reflecting mirror is formed of a dielectric material, it is lightweight, the number of parts is reduced, and the antenna can be easily assembled and adjusted.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the invention, FIG. 2 is a longitudinal sectional view of another embodiment of the invention, and FIG. 3 is a longitudinal sectional view of a conventional example. 10... Metal support cylinder, 12... Electromagnetic horn, 14.24.34... Dielectric support cylinder, 16.26.
36... Conical paraboloid of rotation main reflecting mirror, 16a, 26a
, 36a... reflective surface. Good, σtsu, Ji's'T-n1, Idarl'' Se1 door face, mouth 2nd figure

Claims (1)

[Scope of Claims] An omnidirectional antenna in a horizontal plane having a main reflecting mirror (26, 36) whose reflecting surface is a substantially conical paraboloid of revolution or a surface of revolution obtained by adding correction to the paraboloid of rotation, the main reflecting mirror comprising: (26, 36) supporting cylinder (24, 34)
An omnidirectional antenna in a horizontal plane, characterized in that the reflecting surface (26a, 36a) is formed by metallizing the dielectric surface.