JPH0728721Y2 - Polarization selection device for primary radiator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a polarization selection device for a primary radiator capable of selectively receiving horizontal polarization and vertical polarization.

[Prior Art] A conventional polarization selecting device of this kind is shown in FIG. 4, for example, in which a support fitting 51 attached to a parabolic reflector (not shown) via a support rod and a plurality of support fittings 51. Hold the cylindrical waveguide 54 of the primary radiator 53 with the frequency converter 56 with the holding metal fitting 52 attached with the bolt 55, and attach the reference scale 57 to the holding metal fitting 52.
On the cylindrical waveguide 54, a scale 58 is provided along the edge of the holding fixture 52 at a position corresponding to the position of the probe in the frequency converter 56, and a scale 59 is provided at a position 90 ° different from this scale. There is. For polarization selection operation, rotate the primary radiator 53 to align the scale 58 with the reference scale 57 for horizontal polarization reception, and scale for vertical polarization reception.
After aligning 59 with the reference scale 57, a plurality of bolts 55 are fastened to fix the primary radiator 53 with the support fitting 51 and the holding fitting 52.

[Problems to be solved by the device]

However, since the plane of polarization differs depending on where the satellite communication receiving antenna is installed, for example, a scale 58
Even if is set to the reference scale 57, horizontal polarized waves may not be accurately received. In such a case, the primary radiator 53 was rotated again to adjust the plane of polarization while observing the level of the spectrum analyzer or CS checker. For this reason, the adjusted scale 58 deviates from the reference scale 57, and the scales 58 and 59 are not useful for the subsequent switching of the reception polarization. That is, in the conventional one, when the desired polarization could not be accurately received at the time of installation due to the scale adjustment, the polarization plane was adjusted while looking at the spectrum analyzer, CS checker, television receiver, etc. each time the reception polarization was switched. However, adjustments are troublesome and time-consuming.

The present invention has been made in view of the above points, and an object thereof is to provide a polarization selection device for a primary radiator that does not require adjustment of the polarization plane for switching the reception polarization.

[Means for Solving the Problems]

In order to achieve this object, in the polarization selection device of the primary radiator of the present invention, for receiving satellite communication, a primary radiator with a frequency converter is provided at the focal point of the parabolic reflector with a supporting bracket and a holding bracket. In the antenna, a rectangular tube with a supporting body and a pressing metal fitting provided with a primary radiator fixing connector on a rectangular tube into which the primary radiator is rotatably fitted, and having a concave portion conforming to the outer shape of the rectangular tube. It is characterized in that the body is detachably fixed.

[Action]

In order to obtain the desired polarized wave when the antenna for receiving satellite communication is initially installed, for example, the level of a spectrum analyzer or a television is used for the rectangular cylindrical body 3 fitted in the recesses 5 and 6 and fixed by the support metal fitting 7 and the holding metal fitting 8. Rotating the primary radiator 1 while watching the image on the receiver, the coupler at the desired polarization reception position
The primary radiator 1 may be fixed to the rectangular cylindrical body 3 by 13.
For the subsequent switching of the reception polarization, if the rectangular cylinder 3 is rotated by approximately 90 ° and then fitted into the recess 5 of the support fitting 7, the rectangular cylinder 3 is accurately rotated by 90 °. Since the switching is completed, the supporting member 7 and the pressing member 8 fix the rectangular cylindrical body 3.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, 1 is a primary radiator, 2 is a frequency converter attached to the rear end of the primary radiator 1, 3 is a rectangular cylinder, 4 is a support, and the external shape of the rectangular cylinder 3 is shown. U-shaped recess conforming to the shape 5,
A support fitting 7 having 6 and a holding fitting 8 are connected by a plurality of bolts 9.

The rectangular tubular body 3 has a square cross section, and is a cylindrical waveguide of the primary radiator 1.
A through hole 12 for rotatably fitting and a bolt for detachably attaching the primary radiator 1 to the rectangular tube body 3 on each outer peripheral surface.
A screw hole 14 for screwing 13 together is provided. Further, the prismatic tubular body 3 cannot be inserted into the cylindrical waveguide 11 by, for example, projecting a flange portion for mounting the frequency converter 2 on the primary radiator 1, and the prismatic tubular body 3 is, for example, as shown in FIG. With a split structure, the rectangular tube 3 is fitted into the cylindrical waveguide 11 and then bolted.
You may use 15 and connect integrally. In this embodiment, both the supporting metal fitting 7 and the holding metal fitting 8 are formed as U-shaped concave portions for the rectangular cylindrical body receiving portions, but either one may be a U-shaped concave portion and the other may be a flat plate portion.

The setting of the desired polarization at the beginning of the antenna installation and the subsequent switching of the reception polarization according to the present embodiment can be performed as described in the section of the operation. Apart from this, it is also possible to easily obtain the maximum gain rotation angle of the main polarization as described below in the present embodiment.

The maximum gain of the main polarization is broader than the minimum gain rotation angle of the cross polarization, as is clear from the chart of Fig. 5 showing the relationship between the rotation angle of the primary radiator and the signal level of the main polarization. Therefore, it is difficult to obtain the maximum gain rotation angle of the main polarization. However, in the present embodiment, the rectangular cylindrical body 3
Attaches the primary radiator 1 so that it can be rotated and fixed, and is 90 °
Since it can be reattached to the support tool 4 only when it is rotated by an integral multiple of, the desired polarization is first adjusted by adjusting the elevation angle and azimuth angle of the parabolic reflector and rotating the primary radiator 1. In the received state, the primary radiator 1 is fixed to the rectangular tube body 3 and then the support tool 4 is loosened, and the primary radiator 1 is rotated by 90 ° together with the rectangular tube body 3 and the support tool 4 is inserted through the rectangular tube body 3. Fixed to (reverse polarization reception). Here, the primary radiator 1 is rotated without releasing the fixation to the rectangular cylindrical body 3, and the primary radiator 1 is squared at the rotation angle position where the cross polarization signal at the time of receiving the reverse polarization is null (minimum point). When fixed to the tubular body 3, the support tool 4 is loosened, and the primary radiator 1 is rotated by 90 ° together with the rectangular tubular body 3 and the supporting tool 4 is inserted through the rectangular tubular body 3.
If fixed to, the maximum gain rotation angle of the desired polarization can be obtained.
In order to obtain a higher precision, the operation of obtaining the null (minimum point) of the cross polarization signal at the time of receiving the reverse polarization, the fine adjustment of the elevation angle and the azimuth angle of the parabolic reflector, and the primary radiator 1 are used. The operation of receiving the desired polarization may be alternately performed.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

The rectangular tube is mounted so that the primary radiator can be rotated and fixed, and the support and holding brackets are mounted by fitting the rectangular tube into the recess that fits the external shape, so that the polarization of the received polarization can be switched. There is a practical benefit that can be easily and surely adjusted without adjustment.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIGS. 2 and 3 are perspective views of an embodiment of a prismatic tubular body, FIG. 4 is a perspective view of a conventional product, and FIG. 5 is a primary radiator. 6 is a chart showing a relationship between a rotation angle and a polarization signal level. 1 ... Primary radiator, 2 ... Frequency converter, 3 ... Rectangular tube, 5,
6 ... Recess, 7 ... Supporting fitting, 8 ... Holding fitting, 13 ... Primary radiator fixing connector.

Claims (1)

[Scope of utility model registration request] 1. A satellite communication receiving antenna in which a primary radiator (1) with a frequency converter, which is attached to a focal point of a parabolic reflector by a support fitting (7) and a holding fitting (8), is arranged. A rectangular radiator (3) into which the device (1) is rotatably fitted is provided with a primary radiator fixing connector (13), and recesses (5), () conforming to the outer shape of the rectangular barrel (3) are provided. A polarization selecting device for a primary radiator, characterized in that a rectangular tubular body (3) is detachably fixed by a support metal fitting (7) and a metal fitting (8) having a structure (6).