JPS59218006A - Offset parabolic antenna device - Google Patents

Abstract

PURPOSE:To set very easily and surely an angle of a parabolic antenna device by providing a member placed perpendicularly in the incoming direction of a radio wave to a constituting member constituting an offset parabolic antenna device. CONSTITUTION:The constituting member of the offset parabolic antenna device is provided with the member 23 placed perpendicularly in the incoming direction of a radio wave. Since the member directed in the incoming direction of the radio wave is provided, the angle of the antenna has only to be set to a prescribed position angle of a broadcast satellite known in advance by using the member as a reference and the setting of the installing angle of the parabolic antenna device is conducted very easily and surely.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an offset parabolic antenna device.

SHF band satellite broadcast television reception is normally done using a parabolic antenna device as shown in FIG. This parabolic antenna device has a primary radiator 2 that receives reflected waves positioned at the focal point on the reflective surface side of a parabolic reflector l formed into a paraboloid of revolution, and a guide that stands vertically in the center and aligns with its axis. A converter (frequency converter) 4 connected to the tip of the wave tube 3 and arranged on the back side of the parabolic reflector 1 is connected to the base end of the waveguide 30, and the upper side of the back surface of the parabolic reflector l is pivoted 6 to the pedestal 5. The lower part is attached to the frame 5 via adjustment bolts 7. The broadcasting satellite is in a geostationary orbit 361000kIl above the equator, and the radio waves from the broadcasting satellite arrive from the sky as parallel waves at a constant angle to the ground. The angle and elevation angle are announced in advance.

Note that the direction in which the radio waves arrive is indicated by an arrow E in the figure. Therefore, to point this device in the direction of the broadcasting satellite, roughly set the azimuth and elevation angles of the parabolic reflector 1 and the primary radiation N2 by 1 tsubo, and finally determine them using a compass, inclination angle, and protractor. . In such a parabolic antenna device, the primary radiator 2
is positioned perpendicular to the parabolic reflector 1, so the installation angle can be set based on this.

However, unlike the above-mentioned parabolic antenna device, the offset parabolic antenna device does not have a standard for setting the installation angle and is not easy to install.

In the offset parabolic antenna device, the offset parabolic reflector 8 does not include the entire axis of the paraboloid of revolution as shown in FIG. Focus using the primary radiator 9
FIGS. 3, 4, and 5 are specific examples thereof. In this offset parabolic device, the primary radiator 9 is not located in the radio wave arrival path. - The secondary radiator 9 is located at the focal point of the offset parabolic reflector 8, has the converter lO directly connected behind it, is attached to the offset parabolic reflector 8 via the support arm 11, and is attached to the back surface of the offset parabolic reflector 8. It is attached to the antenna mast 13 with an angle adjuster 12 interposed therebetween.

In this offset parabolic antenna device, as can be seen from the figure, the arrival direction of the radio waves, the direction of the offset parabolic reflector 8, and the direction of the -order radiator 9 toward the parabolic reflector 8 do not all match, and the offset parabolic reflector Since the direction in which the radio waves arrive from the mirror 8 cannot be visually confirmed, there is no standard for setting the installation angle, making it very difficult to set it. Furthermore, in the offset parabolic antenna device in which the converter 10 is directly attached to the primary radiator 9, the mounting structure is made to be mounted using as simple a member as possible. Furthermore, it is difficult to set the installation angle of the offset parabolic antenna device because there is a restriction that the constituent members must not cause wind pressure or characteristic deterioration. Therefore, in view of the above-mentioned circumstances, the present invention provides a component that is perpendicular to the direction of arrival of radio waves in the components constituting the offset parabolic antenna device, in order to facilitate the setting of the installation angle of the offset parabolic antenna device. It is.

Hereinafter, the present invention will be described in detail based on specific embodiments shown in FIGS. 6 to 10.

In the offset parabolic antenna device, the primary radiator 1 receives reflected radio waves with respect to the offset parabolic reflector 14.
5 is positioned at the focal point, and a converter 16 is directly connected to the rear of this primary radiator 15, and these are screwed at the base end to the lower side of the back surface of the parabolic reflector 14, and attached to the tips of two support arms 17 extending forward. Install. A reinforcing plate 18 is provided between the support arms 17 for reinforcement, and the tip side of the support arms 17 and the outer peripheral edge of the offset parabolic reflector 14 are connected by a stay rod 19. Such an offset parabolic reflector 14 is attached to the antenna mast 22 with an angle adjuster 21 interposed between the vertical reinforcing ribs 20 on the back surface thereof.

The offset parabolic antenna device constructed in this way is provided with a member 23 that is perpendicular to the radio wave arrival direction.

The following members (surfaces) 23 are perpendicular to the radio wave arrival direction.

(11 Offset Parabolic Reflection! On the back surface of J1114, one or more members 23 are provided which are integrated with the reflecting mirror 14 itself and are perpendicular to the direction in which the radio waves arrive.

(2) A member/surface 23 that is perpendicular to the radio wave arrival direction is provided on another reinforcing rib provided together with the vertical reinforcing rib 20 on the back surface of the offset parabolic reflector 14 or on the antenna installation component.

(3) Along with each member constituting the off-cent parabolic antenna device, a member 23 serving as an angle measurement plate that can measure the direction when setting the antenna direction is provided perpendicular to the direction of arrival of radio waves.

(4) A part of the support arm 17 that supports the primary radiator 15 and converter 16 installed as an antenna device, for example, the base end or upper end of the support arm 17 on the back side of the offset parabolic reflector 14 is set as the radio wave arrival direction. It is formed on a vertical surface 23.

(5) The reinforcing plate 18 of the support arm 17 that supports the primary radiator 15 and converter 16 attached as an antenna device is oriented perpendicular to the direction in which radio waves arrive.

In the above, the member 23 perpendicular to the radio wave arrival direction is a plate, surface,
Although it is made up of sides, it can also be made of pipe material, especially round pipe material.

The installation angle can be set with an offset parabolic antenna device provided with one or more of the above.

To set the elevation angle of the offset parabolic reflector 14, as shown in FIG. 9, first, the inclination angle measuring device 24 is brought into contact with and fixed to a member 23 that is perpendicular to the radio wave arrival direction. Member 2 of measuring instrument 24
If the member 23 is a metal body, the base of the measuring device 24 is a magnetic body, so that it is fixed to the base plate 3 simply by making contact with it.

At this time, the measuring device 24 measures how many degrees IIJi the member 23 is from the vertical.
Indicates whether the Since this angle θ is set so that the member 23 is perpendicular to the radio wave arrival direction, it indicates the elevation angle θ of the off-cent parabolic reflector 14, as can be seen from the figure. Therefore, the measuring device 2 is adjusted to the elevation angle with respect to the broadcasting satellite that is announced and already known in the area where this antenna device is installed.
The elevation angle of the member 23, that is, the offset parabolic reflector 14 integrated with the member 23, is changed so that the indicated angles θ of 4 coincide with each other. Then, the offset parabolic reflector 14
is set to the correct elevation angle.

In FIG. 1O, the protractor 25 is brought into contact with the member 23, the plumb bob 26 is suspended, and the inclination angle θ of the member 23 from the vertical is measured. This angle θ indicates the elevation angle θ of the offset parabolic reflector 14, as in the case of FIG. So,
The member 23 is arranged so that this elevation angle θ matches the elevation angle of the broadcast satellite
, changes the elevation angle of the parabolic reflector 14 integrated therewith.

If the primary radiator 15 is located on a vertical plane that includes the center axis ζ of the offset parabolic reflector 14 as shown in this embodiment in the off-cent parabolic antenna device, then the off-centered parabolic antenna device is turned off with the vertical plane facing the satellite. Saint parabola reflector 14
The azimuth can be set.

Furthermore, although it has been described above that the offset parabolic antenna device is provided with the member 23 that is perpendicular to the radio wave arrival direction, it is also possible to provide a member that is parallel to the radio wave arrival direction in conjunction with the member 23 that is perpendicular to the radio wave arrival direction. Accordingly, it is possible to easily set the installation angle of the offset parabolic antenna device.

As described above, the present invention is an offset parabolic antenna device in which the constituent members of the offset parabolic antenna device are provided with a member perpendicular to the radio wave arrival direction, and when the offset parabolic antenna device is installed toward a broadcasting satellite. Since a member is provided that is perpendicular to the direction of arrival of radio waves, it is only necessary to set the predetermined position angle of the broadcasting satellite based on this as a reference, which is known in advance, making it extremely easy and reliable to set the installation angle of the parabolic antenna device. It is. - Good received radio waves arrive at the next radiator. Further, when setting the approximate angle visually, it is easy to use a member perpendicular to the radio wave arrival direction as a reference. Furthermore, the member perpendicular to the direction of arrival of radio waves according to the present invention can be provided relatively easily, and does not deteriorate the antenna performance or spoil the aesthetics, but rather improves the aesthetics and increases the strength of the antenna device. It is also possible to provide one.

[Brief explanation of drawings]

Figure 1 is a side view of a conventional parabolic antenna device; Figure 2 is a longitudinal and cross-sectional view of an offset parabolic reflector;
5 shows a conventional offset parabolic antenna device, FIG. 3 is a side view of one example of the offset parabolic antenna device, FIG. 4 is a side view of another example of the offset parabolic antenna device, and FIG. 5 is a side view of another example of the offset parabolic antenna device. A vertical cross-sectional view of the antenna part in Figure 4,
6th~l. The figures show a specific embodiment of the present invention, FIG. 6 is a perspective view thereof, FIG. 7 is a cross-sectional view of the offset parabola reflector section of FIG. 6, and FIG. A vertical cross-sectional view of the reflecting mirror section, and FIGS. 9 and 10 are side views illustrating an installation state in which the offset parabolic antenna device is directed toward a broadcasting satellite by a member perpendicular to the direction of arrival of radio waves according to the present invention. 23...Participant perpendicular to the direction of arrival of radio waves Applicant: Yoshiteru Takagi, representative of Diex Antenna Co., Ltd. Official letter of the city on the proceedings (spontaneous) Commissioner of the Patent Office Kazuo Wakasugi 1. Indication of the case 1988 Special Permission No. 92915 2, Name of the invention Offset parabolic antenna device 3, Relationship to the case of the person making the amendment Patent application applicant Address 2-15 Hamasaki-dori, Hyogo-ku, Kobe Name Name Diex Antenna Co., Ltd. Representative Fujino Yoshio 4, agent address: 1-23-26 Edobori, Nishi-ku, Osaka City Detailed description of the invention and drawings in the specification ”
is corrected as "the base end of the support arm 17". (2) "The surface 23 is formed" in the 7th line of page 6 is corrected to "formed by the member 23 such as a plate, surface, side, etc." (3) On page 6, line 11, "direct" is corrected to "comprise." (4) On page 8, line 3, “center axis also” was changed to “center axis (
” he corrected. (5) Figures 7 and 8 of the drawings shall be corrected as shown in the attached sheet. that's all

Claims (1)

[Claims] (1) Offset parabolic antenna device characterized in that the constituent members constituting the Offsera I parabolic antenna device are provided with a member perpendicular to the direction of arrival of radio waves.