JPH03154406A - Antenna system - Google Patents

Abstract

PURPOSE:To facilitate the adjustment of a direction of a radiation beam and the polarized wave face of a linearly polarized wave by adopting the constitution such that a rotary shaft of a rotating parabolic face is place perpendicularly and a tilt angle of a dielectric plate and a rotating angle are adjusted. CONSTITUTION:A metallic grating 3 formed by arranging lots of metallic strips with a narrower width than the wavelength of an operating frequency is provided to the inner face of a dielectric body 2 shaped as a rotating parabolic face. A dielectric plate 4 one side of which a metallic film 8 is provided and other side of which a metallic grating 5 formed hy arranging lots of metallic strips with a narrower width than the wavelength of an operating frequency is provided is placed in an inner space of the dielectric body 2. Furthermore, a primary radiator 1 radiating a radio wave of linearly polarized wave from the inner direction of the dielectric body 2 to the outside is provided and the rotating shaft of the rotating parabolic face of the dielectric body 2 is made almost perpendicular. Then the tilt angle and the rotating angle of the dielectric plate 4 are adjusted. Thus, the volume of the antenna system occupied in space is reduced, and the radiating beam direction of the antenna system and the polarized face of the linearly polarized wave are easily adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a small linearly polarized antenna device used in a simple earth station for satellite communication.

[Conventional technology]

FIG. 5 shows, for example, Mitsubishi Electric Technical Report Vol. 1.58. No, 9.
1 is a schematic configuration diagram showing a conventional antenna device shown in 1984. In the figure, numeral 1 is a primary radiator that emits circularly polarized radio waves, 10 is a reflector that reflects radio waves, and 7 is a receiver that receives radio waves. 11 is a down converter that converts the received frequency to a low frequency; 8 is a coaxial cable that connects the receiver 7 and the down converter 11; 12 is a direction adjustment jig; 14 is a circularly polarized wave that generates circularly polarized waves. It is a generator. FIG. 6 is a schematic configuration diagram showing a conventional antenna device shown, for example, at the 1985 IEICE national conference (lecture number S6-2). In the figure, 20 is an element antenna for circularly polarized wave excitation; 21 is a power supply circuit, 11 is a down converter,
7 is a receiver, and 8 is a coaxial cable.

Next, the operation will be explained. This will be explained using transmission as an example. In FIG. 5, a primary radiator 1 connected to a receiver 7
The circularly polarized spherical radio waves radiated by the reflector 10 are reflected by the reflector 10, converted into plane wave radio waves, and radiated in the mirror axis direction of the reflector 10. A direction adjustment jig 12 is used to align the mirror axis of the reflecting mirror 10 with the direction of the satellite 13.

In addition, in FIG. 6, the receiver 7 is connected to the coaxial cable 8.
Power is supplied to each circularly polarized wave excitation element antenna 20 by two feeder circuits connected to the two.

The amplitude distribution fed to each circularly polarized wave excitation element antenna 20 is uniform, and the phase distribution is adjusted by adjusting the line length of the feeding circuit 21 so that the phases are aligned in a plane perpendicular to the direction of the radiation beam. is set to

The conventional antenna device shown in FIGS. 5 and 6 above is a circularly polarized antenna. However, by removing the circularly polarized wave generator 14 in Fig. 5, it becomes a linearly polarized antenna, and in Fig. 6, by changing the circularly polarized wave excitation element to a linearly polarized wave excitation element, It is easy to infer that it becomes a wave antenna. Here, the above-mentioned FIGS. 5 and 6 will be explained as conventional examples of linearly polarized antennas.

C Problems to be Solved by the Invention] Since the conventional antenna device is configured as described above, in the conventional example shown in FIG. 5, the volume occupied by the antenna device in the space is large. When installing antenna equipment, it is necessary to withstand sufficient wind pressure, so the installation work becomes complicated, and there is also the problem that it does not harmonize with the surrounding scenery of the antenna equipment to be installed, spoiling its aesthetic appearance. .

In addition, the conventional example shown in Fig. 6 has a flat plate-like structure and can be attached to the roof or wall of a house, so it harmonizes with the surrounding landscape of the antenna device and does not spoil the aesthetic appearance. It occupies a small volume and is easy to install. However, the radiation beam direction and linear polarization plane of the antenna device are determined by the line length setting of the feeder circuit 21 and the arrangement of the linear polarization excitation element antenna, respectively;
The roof or wall of a house does not necessarily face the direction of the satellite 13, so after installing the antenna device on the roof or wall of the house, the direction of the radiation beam of the antenna device should match the direction of the satellite 13, or the direction of the antenna device Satellite 1
There was a problem in that it was complicated to adjust the polarization plane to match the polarization plane of No. 3.

This invention was made to solve the above-mentioned problems, and it is possible to reduce the volume occupied by the antenna device (so that the aesthetic appearance is not impaired), and also to change the radiation beam direction and linear polarization of the antenna device. An object of the present invention is to obtain an antenna device whose polarization plane can be easily adjusted.

[Means to solve the problem]

The antenna device according to the present invention includes a metal lattice 3 in which a large number of metal bands having a width narrower than the wavelength of the frequency used is arranged on the inner surface of a dielectric body 2 having a shape of a paraboloid of rotation, and the dielectric body 2 A dielectric plate 4 having a metal film 6 on one surface and a metal grid 5 in which a large number of metal strips having a width narrower than the wavelength of the frequency used is arranged on the other surface is provided in the internal space of the dielectric material. 2
It is equipped with a primary radiator 1 that radiates linearly polarized radio waves from the inside to the outside of the dielectric body, and is installed so that the axis of rotation of the paraboloid of revolution of the dielectric body 2 is substantially perpendicular to the dielectric body. This device is characterized by having a configuration in which the inclination angle and rotation angle of the plate 4 can be adjusted.

[Effect]

In the antenna device of the present invention, substantially spherical linearly polarized radio waves emitted from the -order radiator 1 are converted into substantially planar radio waves on the inner surface of the dielectric body 2 having a paraboloid of revolution shape. The dielectric plate 4
, the polarization plane of the linearly polarized wave is converted into a plane wave that is 90" different from the polarization plane in the -order radiator 1 and reflected,
radiated into space.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a primary radiator composed of a batch antenna, 2 is a dielectric, 3 is a metal grid provided on the inner surface of the dielectric 2, 4 is a dielectric plate, and 5 is provided on one side of the dielectric plate 4. a metal grid 6, a metal film provided on the other side of the dielectric plate 4, 11
12 is a down converter which is a part of the receiver integrally constructed with the primary radiator 1, and 12 is a direction adjustment jig for adjusting the radiation beam direction and polarization plane of the antenna device.

This will be explained using transmission as an example. In FIG. 1, a -order radiator 1 radiates linearly polarized radio waves having a spherical shape toward the inner surface of a dielectric body 2 having a paraboloid of revolution shape. A metal lattice 3 is provided on the inner surface of the dielectric 2. A metal lattice 3 is provided in which a large number of metal bands whose width is narrower than the wavelength of the frequency used is arranged. The dielectric 2 is set so that the plane of polarization of the radio waves coincides with that of the radio waves. Then, the radio waves emitted by the -order radiator l are converted by the metal grating 3 into substantially planar radio waves whose plane of polarization does not change, are reflected, and are directed toward the dielectric plate 4 .

In FIG. 2, the dielectric plate 4 is provided on the same plane as the primary radiator 1, and the side of the dielectric plate 4 facing the dielectric 2 has a narrow width compared to the wavelength of the frequency used. A metal grid 5 in which a large number of metal strips are arranged is provided, and a metal film 6 is provided on the reflective surface side of the metal grid 5. The extending direction of the pattern of the metal grating 5 is set to form an angle of approximately 45'' with the direction of the linearly polarized wave emitted by the primary radiator 1.The thickness of the dielectric plate 4 is 174 wavelengths. The electrical length is set to .The radio wave reflected by the metal grid 3 enters the metal grid 5.The third
As shown in the figure, the radio wave incident on the metal grid 5 is decomposed into a component Ha in the direction in which the metal strips of the metal grid 5 extend, and a component Eb perpendicular to this. The radio wave of the Ha component is reflected on the metal grid 5 as a radio wave with an opposite phase. On the other hand, the Eb component radio wave passes through the metal grating 5, is reflected at the metal film 6 as a radio wave with an opposite phase, and heads toward the metal grating 5 again. Since the thickness of the dielectric plate 4 is an electrical length of 174 wavelengths, the phase of the radio wave returning to the metal grating 5 is the same as the phase when it is incident on the metal grating 5. As a result, the polarization direction of the reflected wave with respect to the metal grating 5 differs from the polarization direction of the incident wave by 90''.

That is, the plane of polarization of the linearly polarized wave is converted by the metal grating 5 into a plane wave whose polarization plane differs by 90 degrees from the plane of polarization in the primary radiator 1, and is reflected back toward the dielectric 2. As shown in Figure 4,
A plane wave whose polarization plane differs by 90' from the plane of polarization in the -order radiator 1 is transmitted through the metal grating 3 provided on the inner surface of the dielectric body 2 and radiated into space.

Since the antenna device is installed so that the axis of rotation of the dielectric 2, which has the shape of a paraboloid of revolution, is almost vertical, the volume occupied by the antenna device is small and it can easily withstand wind pressure, so construction work for installation is unnecessary. It is easy to install, and it harmonizes with the surrounding landscape in which the antenna device is installed, so it does not spoil the aesthetics. Next, the radiation beam direction of the antenna device can be easily adjusted by changing the inclination angle of the dielectric plate 4. Further, the polarization direction of the radiation beam can be easily adjusted by changing the rotation angle of the primary radiator 1 and the dielectric plate 3, which are arranged on the same plane.

In the above embodiment, the down converter, which is part of the receiver, was attached to the dielectric plate, but the entire receiver, part or all of the transmitter, or part or all of the transceiver may be attached to the dielectric plate. You can.

〔Effect of the invention〕

As described above, according to the present invention, a metal lattice in which a large number of metal bands having a width narrower than the wavelength of a frequency used is provided on the inner surface of a dielectric having a paraboloid of rotation shape, and the dielectric Inside, there is a dielectric plate with a metal film on one side and a metal lattice with a large number of metal strips narrower than the wavelength of the frequency used on the other side, and a primary plate that emits linearly polarized radio waves. The configuration includes a radiator, which is installed so that the axis of rotation of the paraboloid of rotation is almost vertical, and the tilt angle and rotation angle of the dielectric plate can be adjusted, thereby reducing the space of the antenna device. This has the advantage that the volume occupied by the antenna device can be reduced, the installation is easy, and the aesthetic appearance is not spoiled, and the direction of the radiation beam of the antenna device and the plane of polarization of linearly polarized waves can be easily adjusted.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an antenna device according to an embodiment of the present invention, and a perspective view of the metal grid 3 seen from directly above when the antenna device name is ≠ #. FIG. A third diagram for explaining the configured primary radiator 1, metal grating 5, reflective film 6, receiver 7, and direction adjustment jig 12.
4 is a diagram for explaining the change in the polarization direction of an incident wave and a reflected wave in the metal grating 5, FIG. 4 is a diagram for explaining the positional relationship between the metal grating 2 and the metal grating 5, and FIG. and the sixth
The figure is a schematic configuration diagram showing a conventional antenna device. 1...-order radiator, 2... dielectric, 3... metal lattice, 4... dielectric plate, 5... metal lattice, 6... metal film.

Claims (1)

[Claims] A metal lattice in which metal bands having a width narrower than the wavelength of the frequency used is arranged on the inner surface of a dielectric body having the shape of a paraboloid of rotation, and a metal film and a metal film on one surface are provided in the internal space of the dielectric body. A dielectric plate is provided on the other surface with a metal grid in which a large number of metal strips having a width narrower than the wavelength of the frequency used is arranged, and linearly polarized radio waves are emitted from the inside of the dielectric to the outside. It is characterized by comprising a primary radiator that emits radiation, installed so that the axis of rotation of the rotating radiation surface of the dielectric is substantially perpendicular, and having a configuration in which the inclination angle and rotation angle of the dielectric plate can be adjusted. antenna device.