JPS603205A - Satellite radio wave reception antenna - Google Patents

Abstract

PURPOSE:To reduxe the cost by fitting a primary radiator to a reflecting plate so as to be moved in the direction of angle of elevation and azimuth angle thereby eliminating the need for a minute adjusting mechanism. CONSTITUTION:The reflecting plate 1 is fixed on a frame 2 comprising a fixed base 3, a base frame 4 and a supporting leg 6 so as to allow lthe azimuth angle and the angle of elevation to be adjusted coarsely. An azimuth angle adjusting metallic fixture 11 is fixed to the tip of a supporting arm 10 by a bolt 12. The metallic fixture 11 has a rising piece 11a, which has an outer side face curved horizontally and vertically so as to have a proper radius of curvature. Further, the piece 11a is provided with a horizontal long hole 13. Moreover, an elevation angle adjusting metallic fixture 14 has an inner side face having a curvature along the outer side face of the piece 11 and a longitudinal long hole 15, the inside face is overlapped on the outer side face of the piece 11a and the crossing part of the long holes 13, 15 of both is connected by an adjusting bolt 16. Further, the primary radiator 9 is fixed to the tip of the elevation angle adjusting metallic fixture 14.

Description

[Detailed Description of the Invention] (a) Industrial Application Field This invention relates to a satellite radio wave receiving antenna, and in particular to a structure for finely adjusting the elevation angle and azimuth angle of a receiving antenna consisting of a first beam radiation plate and a primary radiator. be.

(b) Prior Art FIGS. 1 and 2 show parabolic antennas for receiving radio waves from geostationary satellites that have been used in the past.

1-i of this antenna, the mount 2 that supports the elbow plate 1 has a base frame 4 slidably placed on a fixed base 3''2, and the base frame 6 is slid with an adjustment bolt 5 to adjust the azimuth. That's what I do. In addition, the elevation angle can be coarsely adjusted by providing a large number of coarse adjustment holes 6 in the base frame 4 and attaching support legs 7 to appropriate positions thereof, and adjusting bolts 8 provided at the tops of the support legs 7. Fine adjustments to the elevation angle are being made.

In addition, there are various support structures for the reflector 1, but the mechanism for finely adjusting the elevation angle is all based on the above-mentioned screw adjustment.

(c) Key points to be solved by the invention In the above-mentioned fine adjustment mechanism, it is necessary to adjust the elevation angle of the reflector within the range of 30 to 40 degrees with an accuracy of about 0.1 degrees; Because it had to withstand wind pressure, the condyle was complicated and expensive.

In addition, it is extremely difficult to directly move a large, heavy reflector to adjust the angle, as well as working at heights. Especially when exposed to strong wind pressure, it is extremely difficult to adjust the angle of the reflector. there were.

The object of the present invention is to provide a satellite radio wave receiving antenna that eliminates the above problems.

(b) Means for solving the intercondylar point The present invention provides an antenna consisting of a reflector and a primary radiator, and if the position of the -order radiator deviates within a certain range, the beam direction will shift. However, focusing on the fact that the gain and other characteristics remain almost unchanged, the primary radiator is attached to the reflector so that it can be moved by one angle in the elevation and azimuth directions.

The above configuration will be explained based on the principle diagram shown in FIG.

The X and Y coordinates are determined with the X axis on the diameter of the parabolic reflector 1 and the Y axis on the central axis. The radius F of the reflector 1 is the focal length f of the reflector 1. The position f' of the primary radiator before movement is the position f' of the primary radiator after movement, f'(x, y ) is the position θ on the X and Y axes The deflection angle δ of the beam is the distance p11 from the center of the reflector 1 to the intersection of the X and Y axes
F el, 12 is the distance e3 from the periphery of the reflector 1 to f'
is the distance from the center of the reflector 1 to f'.

Now, assuming that the beam of the anti-Q = ) plate 1 (the direction in which the satellite radio waves are received) coincides with the Y axis, the -order radiator is placed at the position f, that is, the focal point.

Next, if the direction of the beam deviates by an angle θ, conventionally the direction of the reflector 1 is moved to point in that direction, but in the case of this invention, the direction of the reflector 1 is not changed, but - The next radiator is f/(x.

y).

The most desirable position of f' (x, y), that is, the position where the gain decrease is minimum, can be determined, for example, as follows.

That is, in order to make the phase difference between the reflected waves from the center and the ends of the reflector 1 zero, the radio waves from the equiphase plane m just before entering the reflector 1 to f' (x, y) must be If the lengths of the paths are equal, the phase difference of the radio waves arriving at f'(x, y) should be zero, so if we consider this for the radio waves arriving at the center and both ends of the reflector plate 1, θ As long as is small, it will be as follows.

7?1=7? z+ 2 aθ=b+δ+aθ −(1
)-', ll+122132δ=0... (2)
Here, !・-f + However, F is the focal length of the reflector 1.

-I7→-p=='0... (3) Above (3)
f'(x, y) shown in the equation is the point at which the gain decrease is minimized.

Therefore, the −order radiator satisfies this relationship” (x
+y), the elevation angle can be adjusted, and the azimuth angle can also be adjusted in the same way on the plane formed by the Z axis and the Y axis, which are perpendicular to the X axis.

(e) Example FIG. 3 is an example of an offset parabolic antenna,
As in the conventional case, the reflector 1 is fixed on a pedestal 2 consisting of a fixed base 13, a base frame 4, and support legs 6, so that the azimuth and elevation angles can be roughly adjusted. - the secondary radiator 9 is mounted in an offset position by the support arm 10;

An azimuth adjustment fitting 11 is fixed to the tip of the support arm 10 with a bolt 12. This adjustment fitting 11 has a rising piece 11a, and this rising piece 11a has an outer surface curved in the horizontal and vertical directions to have an appropriate curvature. Further, a horizontal elongated hole 13 is provided in the rising piece 11a.

Further, the elevation adjustment fitting 14 has an inner surface having a curvature along the outer surface of the rising piece 11a, and a long hole 15 in the vertical direction,
The inner surface of the rising piece 11a is overlapped with the outer surface of the rising piece 11a, and the intersecting portions of the elongated holes 13 and 15 are connected with an adjustment bolt 16. Further, the -order radiator 9 is fixed to the tip of the elevation adjustment fitting 14.

The curvatures of the curved surfaces of the rising piece 11a and the elevation adjustment fitting 14 are appropriately determined so that the above-mentioned "(x+Y)" position can be obtained.

(f) Effects As described above, this invention allows fine adjustment of the azimuth or elevation angle by moving the position of the primary radiator, which eliminates the need for a fine adjustment mechanism and significantly reduces costs. In addition to being able to reduce the amount of noise, the work is also significantly easier because fine adjustments can be made by only slightly moving the primary radiator, which is much lighter than the reflector.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the conventional example, FIG. 2 is a plan view of the base portion of FIG. 1, FIG. 3 is a sectional view of the embodiment of the present invention, and FIG. FIG. 5 is a sectional view of the same, and FIG. 6 is a diagram of the principle. 1... Reflector plate, 2... Frame, 9... -order radiator,
10...Support arm, 11...Azimuth angle adjustment fitting, 13.
...Long hole, 14...Elevation angle adjustment fitting, 15...Long hole,
16...Adjustment bolt patent Seller Sumitomo Electric Industries Co., Ltd. Agent Kama 1) Text 2

Claims (1)

[Claims] (11) In a satellite radio receiving antenna consisting of a reflector and a primary radiator, the primary radiator is attached to the reflector so as to be movable in the elevation angle and azimuth directions, and the movement of the -order radiator causes the elevation angle to be (2) A satellite radio wave receiving antenna according to claim 1, characterized in that the reflector is attached via a rough adjustment] scale. Receiving antenna. (3) Item 1 - The primary radiator is moved to a position where the phase difference between the reflected waves that are reflected by the satellite radio waves at the main points of the reflector and collected at the primary radiator is minimized. A satellite radio wave receiving antenna according to claim 1 or 2. +4+ The reflecting plate of l is formed of a rotating parabolic surface,
The primary radiator is moved along the locus shown by the following formula in the elevation and azimuth planes so that the radio waves arriving at the center point and the edge of the parabolic surface are reflected and the phases of the radio waves that converge on the primary radiator match. A satellite radio wave receiving antenna according to any one of claims 1 to 3, characterized in that the antenna moves. Memory 2+ p 2 ' + p-. However, a: Length from the center of the parabolic surface to the end of the parabolic surface in the plane in which the beam direction is to be adjusted F: Focal length of the parabolic surface X: Parabola center in the plane in which the beam direction is to be adjusted Position y on the coordinate axis in the direction perpendicular to the axis: Similarly, the position on the coordinate axis that coincides with the central axis of the parabola. A curved surface with curvature was formed, and one adjustment plate had a horizontal long hole, and the other adjustment plate had a vertical long hole. A satellite radio wave receiving antenna according to claim 3 or 4, characterized in that: