JPH08288720A - Device for adjusting parabolic antenna - Google Patents

Abstract

PURPOSE: To make it possible to easily adjust the direction of a parabolic antenna even when its aperture is large. CONSTITUTION: Recessed parts 11, 12 are formed on two front and rear positions on the outer barrel of a primary radiator 2, and at the time of fitting the radiator 2 to a supporting arm 3 at the position of the recessed part 11 (or 12), the radiator 2 is set up on the focal position of a parabolic reflector. After roughly adjusting the elevation angle/azimuth angle of the antenna by fitting the radiator 2 to the arm 3 on the position of the recessed part 12 (or 11), the arm 3 is returned to the position of the recessed part 11 (or 12) to execute fine adjustment. A microwave made incident upon the radiator 2 is led into a down converter 7 through a waveguide 6, converted into required intermediate frequency and outputted to a receiver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parabolic antenna adjustment device, and more particularly to a device for broadening directivity to facilitate rough adjustment.

[0002]

2. Description of the Related Art To adjust the direction when installing a parabolic antenna (hereinafter abbreviated as "antenna"), refer to the instructions attached to the antenna, check the approximate elevation angle of the satellite at the installation location, and adjust the elevation angle of the antenna roughly. It is common practice to make an adjustment, then coarsely adjust the azimuth, and then alternately finely adjust the elevation and azimuth to determine the best point. This method is not difficult for people who are accustomed to installing the antenna, or if the antenna diameter is small and the directivity is broad, but for people who have no experience installing the antenna or the antenna diameter. If is large, it is difficult to adjust the orientation of the antenna. This is because G is between the antenna gain G and the half-value angle φ (angle at which the antenna gain is halved).
There is a relation of × (square of φ) = 4π (constant value). In the case of a parabolic antenna, the gain G is proportional to the square of the diameter of the antenna. Therefore, the half-value angle φ decreases as the antenna diameter increases. When the diameter of the antenna is 45 cm, the half-value angle is about 3.7 degrees, but when the diameter is 120 cm, it is about 1.5 degrees. Therefore, the antenna with a large diameter has a sharp directivity, and it is difficult to find the target satellite. There is a problem that it takes time.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention, when adjusting the orientation of the antenna, broadens the directivity of the antenna during the coarse adjustment stage to facilitate the capture of the target satellite and to perform the coarse adjustment. After completing the above, the original directional performance of the antenna is restored and fine adjustment is performed.

[0004]

According to the present invention, in order to solve the above-mentioned problems, a primary radiator is mounted such that an outer shell is sandwiched by support arms and is arranged in front of a parabolic reflector. In a parabolic antenna for receiving radio waves in the microwave band, at least two front and rear portions of the outer shell of the primary radiator are provided with support arm attachment portions, and one of the support arm attachment portions attaches the primary radiator to the support arm. In this case, the parabolic antenna adjustment device is set so that the radio wave from the reflector is set to enter the primary radiator the most, and the primary radiator is attached to the support arm at the other support arm attachment part for coarse adjustment. It is provided.

[0005]

With the above-described structure, in the antenna adjusting apparatus according to the present invention, the position of the primary radiator with respect to the parabolic reflector is shifted forward or backward when the antenna orientation is roughly adjusted to broaden the directivity. Facilitates the acquisition of the target satellite. After the coarse adjustment, the primary radiator is returned to the predetermined position to make the original directivity of the antenna and fine adjustment is performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an antenna adjusting device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view of an essential part showing an outline of an antenna adjusting apparatus according to the present invention. In the figure, 1 is a parabolic reflector, 2 is a primary radiator, and 3 is a support arm. The support arm 3 is attached to the antenna mounting tool 4 together with the parabolic reflector 1, and the antenna mounting tool 4 is mounted on the pole 5 so that the elevation angle and the azimuth angle can be adjusted by changing the vertical tilt and the horizontal direction. There is. Radio waves from satellites are parabolic reflector 1
Is reflected by, enters the primary radiator 2 arranged at the focal position, is guided to the converter 7 via the waveguide 6, is down-converted to a required intermediate frequency, and is sent to a receiver or the like by a signal cable (not shown). To be done. Reference numeral 8 denotes a polarization switching device that switches the antenna between horizontal polarization and vertical polarization according to a signal output from the receiver according to the received radio wave.

FIG. 2 is a side view of essential parts of an embodiment of an antenna adjusting apparatus according to the present invention. Reference numerals 11 and 12 in the figure denote recesses formed in the outer shell of the primary radiator 2 and the waveguide 6.
The recesses 11 and 12 are each formed to have a width corresponding to the width of the portion where the primary radiator of the support arm 3 is mounted. For example, when the recess 12 is attached to the support arm 3, the primary radiator 2 becomes the parabolic reflector 1. The radio wave accurately placed at the focal point of and reflected by the parabolic reflector 1 is incident on the primary radiator 2 to the maximum extent. To adjust the orientation of the antenna, first make a coarse adjustment and then a fine adjustment. For coarse adjustment, use bolt 13
To open the upper half of the support arm 3 upward, remove the primary radiator 2 etc. from the support arm 3 and move it in the direction opposite to the arrow (forward) to sandwich the recess 11 with the support arm 3 and in this state the antenna The direction of the target satellite radio wave by adjusting the direction of, and after that, move the primary radiator 2 etc. rearward so that the support arm 3 is in the position of the recess 12, and tighten the bolt 13 to fix it to the support arm 3. And make fine adjustments. Or a recess
Primary radiator 2 when attached to support arm 3 at position 11
May be set to the focal position of the parabolic reflector 1 and the primary radiator 2 or the like may be moved in the direction of the arrow (rearward) to perform rough adjustment. The opposite side of the support arm 3 (the back side in the figure) is also tightened with bolts in the same manner as the front side in the figure, or is formed in a shape in which the upper and lower abutting portions cross each other vertically, and a hinge is formed through a hinge at the crossing portion You may.

FIG. 3 is a side view of the essential parts of another embodiment of the antenna adjusting apparatus according to the present invention. The figure shows an example in which the converter 7 is attached in a direction substantially perpendicular to the waveguide 6 and is attached to the support arm 3 by a support arm attachment base 21 provided on the side of the converter 7. 22 is a bolt and 23 is an adapter. The primary radiator 2 mounts the adapter 23 on the support arm 3
And, it is set so as to be positioned at the focal point of the parabolic reflector in a state where it is inserted between the support arm mounts 21. For coarse adjustment of the antenna, use an adapter between the support arm 3 and the head of the bolt 22.
Temporarily tighten the bolt 22 at the position where the 23 is inserted (the adapter 23 on the left side of the support arm 3 in the figure is moved to the right side), that is, the position where the primary radiator 2 is moved in the direction opposite to the arrow a (forward). After coarse adjustment, loosen bolt 22 and adapter 23
The primary radiator 2 by turning it in the direction of arrow b.
Move in the direction of the arrow a to the position shown in the figure, make a gap between the support arm mount 21 and the support arm 3, and rotate the removed adapter 23 in the direction opposite to the arrow b. Then, the primary radiator 2 is fixed by tightening the bolts 22 and then finely adjusting. Connect the adapter 23 as shown
By forming it in a V shape, the adapter 23 can be pulled out only by loosening it without pulling out the bolt 22. The primary radiator 2 is set so as to be located at the focal point of the parabolic reflector with the adapter 23 inserted in the front side of the support arm and the support arm mount 21 in close contact with the support arm 3 to support the adapter 23. Rough adjustment may be performed in a state in which the arm 3 and the support arm mount 21 are inserted and attached.

Alternatively, the E-shaped adapter 23 'may be formed and the bolts may be inserted into the upper and lower recessed portions.

As described above, by moving the primary radiator 2 forward or backward from the focus position of the parabolic reflector, the directivity becomes broad and it becomes easy to capture the radio waves of the satellite. This will be described with reference to FIG. FIG. 4A shows an example in which the primary radiator 2 is moved forward as indicated by an arrow a (solid line →
In the dotted line, the primary radiator 2 is at the normal position (solid line), that is, when the parabola is at the focal point, most of the reflected waves from the parabolic reflector 1 (range of arrow b) are incident on the primary radiator 2. On the other hand, by moving the primary radiator 2 forward (position of the dotted line), only the reflected wave within the range of the arrow c shown by the dotted line is incident on the primary radiator 2. This is the same as making the diameter of the parabolic reflector 1 smaller, the gain is lowered and the directivity is broadened, and even if the direction of the parabolic reflector 1 (including the primary radiator 2) is deviated, satellite radio waves Since the range (elevation angle / azimuth angle) that can be captured is widened, adjustment is easy. FIG. 4B shows an example in which the primary radiator 2 and the like are moved backward, for example, as indicated by a ′ (solid line → dotted line). The primary radiator 2 includes only reflected waves in the range of arrow c ′ indicated by the dotted line. Will be incident, which is equivalent to using a parabolic reflector with a small diameter, as in the case of (a), and the directivity becomes broad and satellite radio waves can be easily captured.

[0011]

As described above, according to the antenna adjusting apparatus of the present invention, the primary radiator can be moved forward or backward from the normal position during coarse adjustment, so that the directivity of the antenna becomes broad. Even in the case of an antenna having a large diameter, rough adjustment is easy, and after the rough adjustment, the primary radiator is returned to the normal position and fine adjustment is performed, so that the performance of the antenna is not hindered. In the case of the primary radiator, the width of the concave portion provided in the outer shell matches the width of the support arm in the example of FIG. 2, so even if the primary radiator is moved during coarse adjustment, it can be easily returned to the normal position after coarse adjustment. Further, in the example of FIG. 2, the primary radiator can be returned to the normal position at the time of fine adjustment simply by moving the adapter.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an outline of a parabolic antenna adjusting device according to the present invention.

FIG. 2 is a side view of essential parts of an embodiment of a parabolic antenna adjusting device according to the present invention.

FIG. 3 is a side view of essential parts of another embodiment of the parabolic antenna adjusting device according to the present invention.

FIG. 4 is a diagram for explaining the narrowing of the effective diameter of the parabolic reflector due to the forward and backward movement of the primary radiator.

[Explanation of symbols]

 1 Parabolic reflector 2 Primary radiator 3 Support arm 6 Waveguide 7 Converter 21 Support arm mount 22 Bolt 23, 23 'Adapter

Claims (7)

[Claims] 1. A parabolic antenna for mounting an outer shell of a primary radiator so as to be sandwiched between support arms and disposing the parabolic reflector in front of the parabolic antenna to receive radio waves in a microwave band. An adjusting device for a parabolic antenna, wherein support arm attachment portions are provided at least at two front and rear positions of the outer body of the radiator. 2. When the primary radiator is attached to one of the support arm attachment portions, the radio wave from the reflecting mirror is set to be incident on the primary radiator most, and the other support arm attachment portion is set. The adjustment device for the parabolic antenna according to claim 1, wherein the primary radiator is attached to the support arm for rough adjustment. 3. The support arm mounting portion is provided with a recess having a width corresponding to a width of a portion where the primary radiator of the support arm is mounted on the outer shell of the primary radiator. Parabolic antenna adjustment device. 4. A microwave band which is provided with a support arm attachment portion at a portion perpendicular to the outer shell of the primary radiator to attach the primary radiator to the support arm and which is disposed in front of a parabolic reflector. Parabolic antenna for receiving radio waves of the above, wherein a parabolic antenna adjusting device is provided with an adapter inserted between the support arm attachment portion and the support arm. 5. When the adapter is inserted between the support arm attachment portion and the support arm, the radio wave from the reflecting mirror is set to enter the primary radiator most, and the adapter is set to the support arm. The adjustment device for the parabolic antenna according to claim 4, wherein the coarse adjustment is performed without being inserted between the mounting portion and the support arm. 6. The adapter according to claim 4 or 5, wherein the adapter is formed in an S shape, and bolts or the like are inserted into the upper and lower recessed portions to fasten the support arm and the support arm attachment portion. Parabolic antenna adjustment device. 7. The adapter according to claim 4 or 5, wherein the adapter is formed in an E shape, and bolts or the like are inserted into the upper and lower recessed portions to fasten the support arm and the support arm attachment portion. Parabolic antenna adjustment device.