JPH0661733A - Polarized angle adjustment antenna - Google Patents

Abstract

PURPOSE:To adjust the polarized angle even for a parabolic antenna provided with an integral feeding section. CONSTITUTION:An integral feeding section 52 is arranged in the vicinity of a focus of an offset parabolic reflecting mirror 50 and the feeding section 52 is coupled with an arm 70 extended from the parabolic reflecting mirror 50 via a rotary adjustment jig 64. The feeding section 52 has a probe 60 in a waveguide 58 connecting to a horn section 56 and a signal received by the probe 60 is frequency-converted by a converter in the feeding section 52. Circular-arc shaped grooves 74, 76 around a center axis of the waveguide 58 are provided to a support 66 fixed to an arm 70 in the rotary adjustment jib 64 and the feeding section 52 is fixed to the support 66 by using bolts 78, 80, 82 inserted to the grooves 74, 76.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parabolic antenna for receiving a linearly polarized wave, and more particularly to a parabolic antenna capable of adjusting a polarization angle.

[0002]

2. Description of the Related Art At present, satellite communication signals transmitted from communication satellites are sometimes received by parabolic antennas at homes and the like. Horizontal or vertical polarization is used for radio waves from communication satellites. Radio waves from communication satellites are received at various receiving points throughout Japan. Therefore, the tilt angle (polarization angle) of the vertically polarized wave when the communication satellite is viewed from each reception point is different as shown in Table 1, for example. Table 1 is an example of one communication satellite that can be received in Japan, and these polarization angles differ depending on the launch longitude of the communication satellite even at the same receiving point.

[0003]

[Table 1]

Therefore, in order to satisfactorily receive the satellite communication signal by the parabolic antenna according to each reception point, the parabolic antenna is provided at the focal position of the parabolic reflector such as a parabolic reflector or an offset parabolic reflector. In addition, it was necessary to adjust the position of the probe provided in the primary radiator.

Conventionally, the primary radiator and the converter for converting the frequency of the satellite communication signal received by the primary radiator into a low frequency are directly connected to each other to form a power feeding unit. There are a separate type that can be mechanically separated and an integral type that cannot be mechanically separated.

An example of the separate type is shown in FIG. In the figure, reference numeral 10 denotes a mounting member provided near the focal position of a parabolic reflecting mirror (not shown), and this mounting member 10 is attached to the reflecting mirror by an arm 12. The primary radiator 14 has a horn portion 16 and a circular waveguide 18 connected to the horn portion 16, and a probe (not shown) is provided in the waveguide 18. A converter 20 is provided on the back of the waveguide 18.
Is provided. Attach the middle of the waveguide 18 to the mounting bracket 1
It is fitted in a recess 22 provided at the center of 0, and is pressed by an inverted U-shaped pressing metal fitting 24 from the upper part thereof and fixed by bolts 26, 26. When the waveguide 18 is fitted into the recess 22, the probe inside thereof rotates the waveguide 18 around its central axis so that the probe has an angle corresponding to the polarization angle at the reception point.

An example of the integrated power supply unit 28 is shown in FIGS. As shown in FIG. 7, the integrated feed unit 28 is arranged at the focal position of the offset parabolic reflector 30, and is supported by an arm 32 extending from the offset parabolic reflector 30. As shown in FIG. 9, this arm 32 has bolts 3 attached to a mounting member 34 provided on the front surface of the power feeding portion 28.
It is fixed by 6, 36.

As shown in FIG. 8, the feeding portion 28 has a horn portion 38 and a waveguide 40 connected to the horn portion 38, and a probe 42 is provided in the waveguide 40. A converter (not shown) for converting the frequency of the satellite communication signal received in step 3 through a directly integrated microstrip line is provided inside the power supply unit 28. In addition, in FIG. 8, the radome 44 shown in FIG.
Are not shown.

[0009]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention
Since the waveguide 18 can be rotated around its central axis, it is possible to adjust the position of the probe to a polarization angle according to the reception point. Since it is non-rotatably fixed by bolts 36, 36, the position of the probe cannot be adjusted to the polarization angle according to the reception point. Therefore, for example, in FIG.
When the probe and the polarization angle do not match each other, as in the point B, the main polarization level (solid line) of the converter is lower than when the probe and the polarization angle match each other, as in the point A. On the contrary, there is a problem that the cross polarization level (dotted line) increases.

[0010]

In order to achieve the above object, the present invention comprises a parabolic reflector such as a paraboloid of revolution parabolic reflector and an offset parabolic reflector, and an integral power feeding section. There is. The integrated power feeding section includes a horn section arranged substantially at the focal point of the reflecting mirror, a waveguide connected to the horn section, and a linearly polarized wave reception probe provided in the waveguide. The frequency conversion unit that frequency-converts the signal received by this probe is integrally formed. Further, in the present invention, an arm for supporting the power feeding portion, a rotation adjusting means for rotatably attaching the power feeding portion to the arm with the central axis of the waveguide as the center of rotation,
It is equipped with.

The rotation adjusting means includes a support body fixed to the arm, an arcuate groove formed in the support body about the central axis of the waveguide, and the power feeding portion inserted into the groove. And a fixing tool that is detachably attached to the support and that fixes the power supply unit to the support body. Further, it is possible to provide a plurality of the fixing tools, or to provide a plurality of the grooves and to provide the fixing tools in the respective grooves.

[0012]

According to the present invention, the power feeding portion is attached to the arm through the rotation adjusting means. Since the rotation adjusting means allows the power feeding portion to rotate about the central axis of the waveguide therein, the probe inside the waveguide can be rotated around the central axis.

In particular, when the rotation adjusting means is composed of a support, a groove, and a fixture, when the fixture is loosened a little and the feeding part is rotated, the fixture is guided into the groove and the center of the waveguide is guided. The power feeding unit rotates about the shaft. Further, if a plurality of grooves are provided and a fixing tool is provided in each groove, the power feeding portion can be firmly fixed.

[0014]

EXAMPLE In this example, the present invention is applied to an offset parabolic antenna as shown in FIG. 1, and has an offset parabolic reflector 50. In the vicinity of the focal position of the offset parabolic reflecting mirror 50, the integrated power feeding unit 52 is provided.
Are arranged.

As shown in FIG. 3, this integral type power feeding section 52 has a radome 54 at the upper part of its front surface, and a horn section 56 is provided inside the radome 54, as shown in FIG. A circular waveguide 58 is provided following the horn portion 56. A probe 60 for receiving linearly polarized waves is provided in the waveguide 58. The probe 60 propagates from the communication satellite as indicated by reference numeral 59 in FIG. 1, is reflected by the offset parabolic reflector 50, and is propagated through the horn section 56 and the circular waveguide 58. Is for receiving.

The satellite communication signal received by the probe 60 is converted into an intermediate frequency signal having a frequency lower than that of the satellite communication signal by a converter (not shown) provided in the integrated power feeding section 52, It is supplied to the output terminal 61. The output terminal 61 supplies the tuner (not shown) through a coaxial cable (not shown).

As described above, since the converter is provided inside the integrated power supply unit 52, the horn unit 56,
The primary radiator composed of the circular waveguide 58 and the probe 60 and the converter are mechanically inseparable.

As shown in FIG. 3, a rectangular parallelepiped mounting portion 62 is provided on the lower portion of the front surface of the integrated type power feeding portion 52, and a support body 66 of a rotation adjusting tool 64 is provided on the front surface thereof. ing. An arm attachment portion 68 is provided on the lower portion of the front surface of the support body 66, and an arm 70 is attached to the arm attachment portion 68.
Are connected by bolts.

The arm 70 is attached to a support fitting 72 provided on the back side of the offset parabolic reflector 50 as shown in FIG. The support fitting 72 is attached to a column (not shown), and supports the offset parabolic reflector 50, the power feeding portion 52, the arm 70, and the like. Further, the support fitting 72 is configured so that the elevation angle and the azimuth angle of the offset parabolic reflecting mirror can be adjusted by adjusting the support fitting 72.

Further, two grooves 74 and 76 are provided on the upper portion of the support body 66 at intervals vertically. These grooves 74 and 76 are formed in an arc shape having different radii about the center axis of the circular waveguide 58 when the support 66 is attached to the attachment portion 62. Further, the grooves 74 and 76 are both formed symmetrically with respect to a vertical line passing through the central axis O of the waveguide 58.

Two bolts 78 and 80 are inserted in the groove 74, and one bolt 82 is inserted in the groove 76. These bolts 78, 80, 82 are attached to the mounting portion 6
The mounting portion 62 and the power feeding portion 52 connected to the mounting portion 62 are fixed to the support body 66. Here, the bolts 78, 80, 82 are arranged so as to be located at the respective vertices of the triangle. That is, the mounting portion 6
2, the power supply unit 52, the support body 66, the bolt 78,
It is supported at three points by 80 and 82.

In the offset parabolic antenna configured as described above, the offset parabolic reflector 50 is adjusted to have an azimuth angle corresponding to the communication satellite to be received at a certain reception point by adjusting the mounting direction to the support fitting 72. Is adjusted, and further, the support fitting 72 is adjusted to adjust the offset parabolic reflector 50 to an elevation angle according to the communication satellite to be received. This azimuth and elevation adjustment is
It is performed so that the output of the converter provided in the power feeding unit 52 reaches the maximum level. Note that, when the azimuth angle and the elevation angle are adjusted in this way, the probe 60 in the waveguide 58 is assumed to be located on the horizontal line 86 shown in FIG.

After adjusting the azimuth angle and the elevation angle in this way,
Bolts 78, 80, 82 inserted in the grooves 74, 76
Loosen a little. In this state, when the power feeding part 52 is held by hand and rotated, the bolts 78, 80, 82 are moved to the groove 74,
Guided by 76, power supply 52 and mounting 6
Since 2 rotates about the central axis O of the waveguide 58, the probe 60 also rotates around the central axis O of the waveguide 58. Therefore, after the adjustment of the azimuth angle and the elevation angle is completed, the power feeding unit 52 may be rotated to a position where the output of the converter reaches the maximum level. Of course, the loosened bolt 78,
Tighten 80 and 82 again, and the power feeding part 52 and the mounting part 6
2 must be fixed to the support 66.

FIGS. 4 and 5 show the probe 6 in this way.
The state where the position of 0 is changed from the state shown in FIG. 2 to adjust the polarization angle is shown. The polarization angle is adjusted so that the main polarization level and the cross polarization level at the point A are obtained as shown in FIG. FIG. 4 shows the case where the polarization angle θ is adjusted so that the satellite communication signal from a certain communication satellite is received in Sapporo, and FIG. 5 is the polarization so that the satellite communication signal from the same communication satellite is received in Okinawa. The case where the angle θ is adjusted is shown. As described above, the probe 60 may rotate above the horizontal line 86 or may rotate below the horizontal line 86 depending on the reception point. Therefore, the grooves 74 and 76 are provided so as to be located on both sides of the vertical line 77.

In the above embodiment, the support 66 is provided with the two grooves 74 and 76, but at least one groove may be provided. Also, insert the two bolts 78, 80 into the groove 74,
Although one bolt 82 is provided in the groove 76, conversely, one bolt 82 is provided in the groove 74.
One bolt may be inserted and two bolts may be inserted in the groove 76, and the number of bolts inserted in each groove may be arbitrarily changed. Further, in the above embodiment, the offset parabolic reflector is used as the reflector, but a paraboloid of revolution parabolic antenna can also be used. Further, although the power feeding portion 52 is attached to the offset parabolic reflecting mirror 50 by the arm 70, it may be attached to the column supporting the offset parabolic reflecting mirror 50. Further, in order to facilitate the adjustment of the polarization angle, a display showing the polarization angle may be provided along the grooves 74 and 76.

[0026]

As described above, according to the present invention, the integral type power feeding portion provided in the vicinity of the focal position of the parabolic reflector is rotated about the central axis of the waveguide provided therein. Since it is attached to the arm by the rotation adjusting means, the probe can be rotated about the central axis of the waveguide by rotating the integrated power feeding unit, and even with the integrated power feeding unit, The polarization angle can be adjusted, and it becomes possible to receive the linearly polarized signal from the communication satellite in the best condition.

Further, the rotation adjusting means is provided with a support body fixed to the arm, an arcuate groove centered on the center axis of the waveguide formed in the support body, and inserted into the groove to feed the power. If a fixture is provided that is detachably attached to the section and that fixes the power supply section to the support body, when the power supply section is rotated with the fixture loosened, the fixture is inserted into the groove. Since it is guided and rotates, it is possible to quickly adjust the polarization angle so that the deviation between the main polarization level and the cross polarization level becomes maximum.

When a plurality of fixtures are provided, the support and the power feeding portion are supported at multiple points, so that they can be firmly fixed. Further, when a plurality of grooves are provided on a plurality of concentric circles having different radii and a fixture is provided in each groove, the support and the power feeding portion are supported at a plurality of different points, so that they are more firmly fixed.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a polarization angle adjusting antenna according to the present invention.

FIG. 2 is a front view of a power feeding unit in the embodiment.

FIG. 3 is a side view of a power feeding unit in the embodiment.

FIG. 4 is a front view of the power feeding unit in a state where the polarization angle is adjusted at a certain reception point in the embodiment.

FIG. 5 is a front view of the power feeding unit in the same embodiment in a state where the polarization angle is adjusted at a reception point different from that in FIG.

FIG. 6 is an assembly diagram showing a mounting state of a conventional power supply unit that can separate a horn unit and a converter.

FIG. 7 is a perspective view of a conventional osset parabolic antenna using a power feeding unit in which a horn unit and a converter are integrated.

FIG. 8 is a front view of the power feeding unit of FIG.

9 is a side view of the power feeding unit of FIG. 7. FIG.

10 is a diagram showing a change in converter output level based on a deviation between a probe and a polarization angle in the power feeding section of FIG. 7.

[Explanation of symbols]

 50 offset parabolic reflector (parabolic reflector) 52 feeding part 56 horn part 58 circular waveguide 60 probe 64 rotation adjusting tool 66 support 70 arm 74 groove 76 groove 78 bolt (fixing tool) 80 bolt (fixing tool) 82 bolt (Fixture)

Claims (4)

[Claims] 1. A parabolic reflector, a horn portion arranged substantially at the focal point of the reflector, a waveguide connected to the horn portion, and a linearly polarized wave provided in the waveguide. A probe for reception and a frequency conversion unit that frequency-converts the signal received by this probe,
An integrally formed power feeding portion, an arm for supporting the power feeding portion, and a rotation adjusting means for rotatably mounting the power feeding portion on the arm about the center axis of the waveguide as a rotation center. Polarization angle adjusting antenna equipped. 2. The polarization angle adjusting antenna according to claim 1, wherein the rotation adjusting means has a support fixed to the arm and a center axis of the waveguide formed on the support. A polarization angle adjusting antenna, comprising: an arc-shaped groove; and a fixture that is inserted into the groove and is removably provided to the power feeding unit and that fixes the power feeding unit to the support body. 3. The polarization angle adjusting antenna according to claim 2, wherein a plurality of the fixtures are provided. 4. The polarization angle adjusting antenna according to claim 2, wherein the groove is provided on a plurality of concentric circles having different radii, and the fixture is provided in each groove. Polarization angle adjustment antenna.