JPH055688Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a Cassegrain type parabolic antenna using linearly polarized waves, and particularly to a parabolic antenna with a polarization direction adjustment mechanism having an improved polarization direction adjustment mechanism.

[Prior Art] Conventionally, this type of parabolic antenna has a configuration shown in FIG. 4. In the parabolic antenna shown in the figure, the polarization direction can be adjusted by first disconnecting the feeding section 3 from the primary radiator 2, then rotating only the feeding section 3, setting it at the desired rotation angle position, and then This was done by reconnecting with 2. Furthermore, a parabolic antenna is also known in which a linear polarization converter is mounted in a power feeding section via a rotary joint, and the polarization direction is adjusted by rotating the linear polarization converter.

[Problems to be Solved] The polarization direction adjustment method used in the conventional parabolic antenna described above had the following drawbacks.

In other words, in the method of temporarily disconnecting the radiator and the power supply section and rotating only the power supply section, it is not possible to adjust the rotation unless the connecting waveguide section is disconnected during rotation, so the rotation must be adjusted continuously until the desired rotation position is reached. It was difficult. Also, after adjusting the rotation,
When connecting the connecting waveguide sections, the adjustment work was extremely troublesome, as very careful connection work was required such as the packing of the waveguide sections falling off and the centering of the waveguides.

On the other hand, in the method of installing a linear polarization converter in the power supply section via a rotary joint and rotating the linear polarization converter, the manufacturing cost of the rotary joint and linear polarization converter becomes very expensive. I had a problem.

The present invention was devised in view of the problems of the prior art described above, and the manufacturing cost is low due to its simple structure.Moreover, it does not cause misalignment of the waveguide, and can continuously adjust any adjustment angle. The purpose of the present invention is to provide a parabolic antenna with a polarization direction adjustment mechanism that can be easily adjusted.

[Means for solving the problem] In order to achieve the above object, the parabolic antenna with a polarization direction adjustment mechanism of the present invention rotates the primary radiator and the feeding part together in a Cassegrain type parabolic antenna using linearly polarized waves. The rotary plate is equipped with a rotary plate for attaching the reflector, and the rotary plate has multiple long holes for mounting the reflector on a circle with the same radius centered on the reflector axis, and the rotary plate and the reflector are fixed through the long holes. The structure is as follows.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

Fig. 1 is a schematic configuration diagram of a parabolic antenna with a polarization direction adjustment mechanism according to this embodiment, Fig. 2 is a detailed diagram of the installation of the rotary plate of this embodiment, and Fig. 3 is a detailed diagram of the installation of the guide ring of this embodiment. It is a diagram.

In the figure, 1 is a main reflecting mirror for reflecting radio waves. The reflecting surface of the reflecting mirror 1 is spread out in a conical shape, and a fitting part that allows the rotation of the primary radiator 2 is formed at the center of the mirror axis. 3 is a power supply unit for supplying voltage to the primary radiator 2 and the like. Reference numeral 4 denotes a rotating plate to which the primary radiator 2 and the power feeding section 3 are fixedly attached and rotated together. The rotating plate 4 is provided with a plurality of elongated holes 5 for attaching the reflecting mirror 1, as shown in detail in FIG. A plurality of elongated holes 5 are provided on a circle having the same radius centered on the reflecting mirror axis. 6 is the primary radiator 2
It is a pipe for fixing the rotary plate 4 and is integrated with the rotary plate 4. Further, 7 is a fixing bolt for fixing the reflecting mirror 1 to the rotating plate 4, and 8 is a guide ring.

The reflecting mirror 1 is attached to the rotary plate 4 at a fitting portion centered on the mirror axis. As shown in detail in FIG. 3, the fixing method is to pass the bolt 7 fitted with the guide ring 8 through the elongated hole 5 and tighten it to the bolt fixing member 1a. Note that the reflecting mirror 1 is fixed in advance to the bolt fixing member 1a. The primary radiator 2 and the power supply section 3 are fixedly attached to the rotary plate 4 and are electrically connected. In this case, the primary radiator 2 is fixed with a pipe 6.

Next, a method of adjusting the polarization direction of the parabolic antenna according to this embodiment will be explained.

First, the fixing bolt 7 is loosened to the extent that the rotating plate 4 can be slightly rotated relative to the reflecting mirror 1 along the elongated hole 5. When the rotary plate 4 is rotated, the primary radiator 2 and the power feeding part 3 fixedly attached to the rotary plate 4 are connected to each other.
rotate as one. At this time, the rotating plate 4
rotates around the mirror axis with the elongated hole 5 guided by the fixing bolt 7. In this case, even if the fixing bolt 7 is loosened, the guide pin 8 will still be attached to the primary radiator 2.
This prevents tilting, misalignment, etc. due to the weight of the power supply unit 3,
The polarization direction is adjusted accurately. Long hole 5
has a length in the circumferential direction that allows the desired rotational movement of the rotating plate 4.

After the adjustment is completed, the fixing bolt 7 is tightened again to fix the positions of the primary radiator 2 and the power feeding section 3.

[Effects of the invention] As explained above, in the parabolic antenna with a polarization direction adjustment mechanism of the invention, the primary radiator and the feeding section are fixedly attached to the rotary plate, and a guide pin is provided to prevent tilting. Rotation adjustment for polarization direction adjustment without disconnecting the radiator and feeder.
By simply loosening the fixing bolt of the rotary plate, the adjustment angle can be adjusted continuously and smoothly to any desired angle without causing misalignment around the main reflecting mirror axis.

Furthermore, the parabolic antenna of the present invention does not require an expensive rotary joint or polarization converter, so it can be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a parabolic antenna with a polarization direction adjustment mechanism according to an embodiment of the present invention, Fig. 2 is a detailed view of the installation of the rotating plate of the parabolic antenna, and Fig. 3 is a guide ring of the parabolic antenna. FIG. 4 is a schematic configuration diagram of a conventional parabolic antenna with a polarization direction adjustment mechanism. 1...Reflector, 2...Primary radiator 2, 3...Power supply section, 4...Rotating plate, 5...Elongated hole, 6...Pipe, 7...Fixing bolt, 8...Guide ring.

Claims (1)

[Scope of utility model registration request] A Cassegrain-type parabolic antenna that uses linearly polarized waves is equipped with a rotary plate for rotating the primary radiator and the feeding part together, and a long hole for attaching the reflector is formed in the rotary plate with the reflector axis as the center. A parabolic antenna with a polarization direction adjustment mechanism, characterized in that a plurality of parabolic antennas are provided on a circle with the same radius, and a rotating plate and a reflecting mirror are fixed through the long holes.