JPS6090404A - Parabolic antenna - Google Patents

Abstract

PURPOSE:To receive efficiently a radio wave, i.e. linear polarized wave from a geostationary satellite by adjusting the rotation of a supporter which fits a dipole element to a parabolic reflector. CONSTITUTION:The reflector 6 is fixed to a reinforcing tool 11 with screw rods, washers, and nuts. The supporter 23 in a hollow tube shape is fitted almost to the center part of the reflector 6 in a radio wave arrival direction. The dipole element 38 is fitted atop the supporter 23 and a reflector 39 is arranged further atop. A feeder 42 to the dipole element is run through the hollow part of the supporter 23 and connected to a feeding box which is not shown in a figure. A rotary fitting plate 24 having circular-arcuate long holes bored at intervals of 120' about the center of the supporter 23 is fixed to the root part of the supporter 23, which is adjusted by rotation and fixed to the reflector 6 and reinforcing tool 11 with this rotary fitting plate 24 and a bolt 29. Thus, the plane of polarization of the dipole element 38 is made coincident with the plane of polarization of an arrival radio wave.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parabolic antenna. Specifically, it relates to a parabolic antenna that can receive linearly polarized radio waves emitted from geostationary satellites.

In this type of parabolic antenna, since the position of the dipole relative to the reflector is fixed, it is possible to receive very good reception in the central position of Japan, but on the other hand, it is possible to receive very good reception in the central position of Japan, but on the other hand, it is possible to receive L geostationary satellites in Hokkaido and other areas. The linearly polarized wave plane emitted from the receiver does not necessarily match the direction of the dipole element in the receiver, resulting in extremely inefficient reception.

Therefore, the present invention aims to provide a parabolic antenna that can efficiently receive linearly polarized radio waves from the geostationary satellites throughout Japan, and that can achieve the preferred reception mode with extremely simple adjustments. be.

The drawings showing the embodiments of the present application will be described below.

1 is a support that is fixedly attached to the ground, a balcony handrail, the roof of a building, etc. 2 is a mounting bracket,
It consists of a base frame 3 connected to the upper end of the support column 1 in a shape, and a tilting frame 4 connected to the base frame 3 so as to be tiltable.
The azimuth angle can be adjusted by rotating the base frame 3 with respect to the support column 1, and the elevation angle can be adjusted by tilting the tilting frame 4 with respect to the base frame 3, as is well known. 5 is a laboratory antenna that is attached to the above-mentioned mounting fixture 2. In this antenna, 6 is a well-known reflector, and a fitting hole 7 is bored in the center of the mirror, and a transparent hole is formed on the outer circumference of the mirror. Holes 8 and 9 are drilled.It is for reinforcing the reflection!!6 with the 1iti reinforcing tool, and is formed by press-molding a metal plate.

In this reinforcing tool 11, reference numeral 12 denotes a through hole that overlaps with the through hole 9 of the reflecting mirror 6, and a threaded rod p and washer 14 inserted therein. The reflecting mirror 6 and this reinforcing tool 11 are fixed using a J-nut 16. Reference numeral 17 indicates a fitting hole provided in the center of the reinforcing tool 11. The lull shows a known fixing nut fixedly attached to the reinforcement 11 around the insertion hole 17. Reference numeral 19 denotes a fixing nut fixedly attached to the reinforcing tool H on the outer circumferential side of the fixing nut 18, and by screwing the pole 20 inserted into the tilting frame 4 to this fixing nut 19, the tilting frame can be fixed. The reinforcing member 11 is being attached to the frame 4. Next, a No. 23 support is provided to protrude from the center of the reflecting mirror 6 toward the radio wave arrival direction (in this embodiment, aligned with the axis of the reflecting mirror 6). This support member is formed in the form of a hollow tube, as clearly shown in FIG. U is a rotating mounting plate which is fixedly attached to the base of the support and is formed into a flange shape as shown in the figure.

Reference numeral 6 denotes a fitting portion in the mounting plate, which is formed in a size that allows it to fit into the fitting hole 7 without significant play and to rotate smoothly. The insertion hole 1 of the reinforcing tool 11 is formed by the 26U protrusion.
It is inserted into 7. Reference numeral 27 denotes mounting holes, and as shown in Fig. 2, three of them are located at 72° from each other with respect to the axis of the support.
They are spaced apart by θ degrees, and each hole is formed into an arc-shaped long hole centered on the above-mentioned axis. Z indicates a fixture for fixing the rotating mounting plate example to the reflecting mirror 6, and the mounting hole I
It consists of a pin (29) inserted into and screwed onto a fixed nut (18), and a well-known washer. A pair of angle display units provided on the 31ti rotating mounting plate and the reflecting mirror 6 are shown.

In this case, a scale is formed along the mounting hole η. The formation is performed by any means such as printing or engraving. 33 is an indication of the area of use provided along the scale holder. Reference numeral 34 denotes an index provided on the reflecting mirror 6, which is provided on the front surface of the reflecting mirror 6 by any means such as a printed sticker or printing. Note that the above-mentioned scale and index are relative to each other, and the scale may be provided on the reflector and the index on the rotating mounting plate. The figure shows a one-cooker radiator that has been modified.In this, 37 is a power supply box with a built-in balanced-unbalanced converter inside.38. The dipole element is mechanically fixed to the feeder box η and connected to the converter inside the feeder box I.The beauty is a reflector, which is connected to the dipole element and towards the direction of radio wave arrival. A shaft, a threaded rod, and a straw provided in an overlapping positional relationship, -1,71<, H418tA
'If MS M V Cause 5' E I A A -
A 42M transmission line is inserted through the hollow part of the support n, and one end thereof is connected to the converter inside the power supply box a. The other end is connected to a converter 6 which is attached to the support column 1 with a flexible band I.

Next, the assembly of the parabolic antenna 5 having the above configuration will be explained. First, as shown in FIG. 2, the reflecting mirror 6 and the reinforcing tool (2) are superimposed on each other, and both are fixed using a threaded rod 13, a nut 16, etc. Next, the fitting portion δ of the rotating mounting plate U is fitted into the fitting hole 7 so that the mounting hole η overlaps with the through hole 8. Fukini Pol)
29 is inserted into the mounting hole I and the through hole 8 through the washer (material), and the tip thereof is screwed into the fixed nut 18. Then, by tightening the bolts 4, the rotating mounting plate example is fixed to the reflecting mirror 6. As a result, the supporting member is fixed in a state in which it projects from the reflecting mirror 6. In this case, as shown in FIG. 5 or 6, the finger [34 is made to point to the scale element 32a of the area where the parabolic antenna 5 is used. In other words, rotate the rotary mounting plate example (rotate around the axis of the support n) without tightening the pin 29 tightly so that the index tone points to the scale element 32a in the target area. . After that, tighten Port and To9 tightly. By doing so, the directions of the dipole elements in the -order radiator 36 can be made to correspond (coincide) with the direction of the polarization plane of radio waves transmitted from a satellite, which will be described later.

It should be noted that each element 32a iL of the scale clearing is formed at a predetermined position so that the above relationship is achieved in any area of use. The assembly of the parabolic antenna 5 is thus completed. Thereafter, the assembled parabolic antenna 5 is attached to the tilting frame 4 of the fixture 2 using bolts and washers 4.

In this state, the AM-FM of /69/Wh sent from geostationary satellite a (for example, geostationary meteorological satellite Himawashi 2)
The radio waves, which are modulated waves but are linearly polarized waves, are reflected by a reflecting mirror 6 in a well-known manner and are focused toward the primary radiator chrysanthemum. The focused radio waves are received by the dipole element blades directly or further reflected by a reflector. In this case, by the adjustment explained based on FIGS. 3 and 6, the direction of the dipole element is set to correspond to the direction of the polarization plane of the radio wave coming from the satellite's tail. Therefore, the radio waves can be efficiently received by the dipole I wing. In this case, the reflector or the dipole element blade can be shielded to prevent radio waves from the satellite from directly hitting the dipole element blade.

The radio waves (microwave radio waves) received by the above dipole-sperm are transmitted after passing through a converter zm42<for example jD2W
etc. coaxial cable) to converter C,
There, it is converted to a signal of a lower frequency (for example, 77 koku). Transmission by converted signal line II! All 45 signals are drawn into the building and sent to the receiver chrysanthemum installed inside the building. The 77 hazy signal is converted into, for example, a computer signal (2D crystal) by the receiver 47, and is sent to the computer 47. This computer 47 is used, for example, to digitally process signals from the satellite and display images, and its output signal is applied to a display screen, on which an image based on the signals from the satellite is displayed.

As described above, in the present invention, (a) #1 in the reflector 6 has a hollow tubular support n protruding from the center, and a dipole is provided at the tip of the reflector 6 in order from the reflector side. Since it is equipped with an element blade and a reflector, the radio waves sent from the satellite Kiku are reflected by the reflector 6 and focused towards the dipole element blade, allowing for highly sensitive reception. In this case, the dipole element blades are shielded by a reflector and then re-reflected by a reflector, which has the effect of enabling highly sensitive reception as is generally known.

←) Furthermore, in the present invention, the plane of polarization is adjusted in accordance with the direction of the plane of polarization at the receiving point (for example, the plane of polarization is slightly inclined with respect to the central part of Japan on the origin side or in Hokkaido). The angle of the dipole element can be easily made to correspond to the direction. That is, by slightly rotating the rotary mounting plate fixed to the base of the support member with respect to the reflector 6, the distance positional relationship between the rear element holder and the reflector I can be maintained without changing. This makes it possible to very easily and accurately align the dipole antenna element with the direction of the polarization plane of the linearly polarized wave from the geostationary satellite. It has the advantage of providing favorable reception throughout the country.

(c) Moreover, when changing the inclination angle of the dipole element, the rotating mounting plate along the reflecting mirror 6 is turned, so for example, the rotating mounting plate can be adjusted using a slight scratch on the reflecting surface as a guide. If you turn it, you can make a small angle, for example /°.

It is possible to turn even a small turning angle of 2° while clearly perceiving it, and the turning angle is extremely accurate. This means that it is extremely quick and accurate to match the direction of the dipole to the polarization plane direction of the linearly polarized wave emitted from the satellite, and it has a significant effect on improving accuracy.

If a scale or the like is provided at the boundary between the reflecting surface of the parabolic antenna and the rotating mounting plate, the above-mentioned convenience can be further appreciated.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a perspective view showing a receiving state, FIG. 2 is a partially cutaway perspective view showing the main parts of a parabolic antenna, FIG. 3 is an exploded perspective view, and FIG. 5 and 6 are longitudinal cross-sectional views showing the attachment structure of the base of the support to the reflector, and front views showing an example of adjustment to make the dipole element correspond to the polarization plane direction of the radio wave (the middle of the support (The primary radiator is shown by an imaginary line). 6... Reflector, S... Support, A... Dipole element, (9)... Reflector, Row... Rotating mounting plate. Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A parabolic antenna is equipped with a hollow tubular support that protrudes largely toward the direction in which the radio waves arrive, approximately in the center of the reflector, and a pair of dipoles that extend toward both sides at the tip of the support. a parabolic element, further comprising a reflecting plate disposed at the tip of the support on the side further toward the radio wave arrival direction than the dipole element at a position overlapping with the dipole element when viewed from the radio wave arrival direction; In the antenna, the structure of the attachment part for the reflecting mirror in the hollow tubular support includes fixing to the support a rotary attachment plate formed in a projecting shape on a surface perpendicular to the axis of the support, and A parabolic antenna characterized in that the rotating mounting plate is attached to the surface of the reflector so as to be rotatably adjustable about the axis of the support.