JP2636750B2 - Quadrature polarization splitter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a quadrature splitter for a small antenna for receiving satellite communications.

[0002]

2. Description of the Related Art A conventional orthogonal mode splitter (Orthomode Transducer) used for a small antenna for satellite communication reception has a structure shown in FIG. 6 disclosed in Japanese Utility Model Laid-Open No. 60-28303. This orthogonal polarization splitter 10 serves to separate vertical polarization (V polarization) and horizontal polarization (H polarization). As shown in FIG. 7, this is connected to a horn 7 of an antenna. By connecting the low noise frequency converter 20 to each of the two branch waveguides 13 of the orthogonal polarization splitter 10, two independent V-polarized signals and H-polarized signals from the satellite are separated. , Two low-noise frequency converters 20 to receive two independent signals.

[0003]

In such a conventional orthogonal polarization splitter 10, since only one low-noise frequency converter 20 is connected to each branch waveguide 13, the low-noise frequency When the converter 20 fails, there is a problem that it cannot be received until it is replaced. Therefore, in order to avoid such an unreceivable state, in the case of Cassegrain antenna 6 or the like shown in FIG. In this case, it is possible to prevent the reception from being disabled by switching the waveguide switch 9. However, if such a structure is applied to a small antenna, the configuration of the feeder circuit including the low-noise frequency converter becomes complicated, its size becomes large, and its weight increases, so that it is not suitable for a small antenna. was there.

The present invention solves such a problem, and provides a quadrature demultiplexer capable of avoiding an unreceivable state when the low-noise frequency converter fails, with a small and simple configuration. The purpose is to:

[0005]

According to the present invention, there is provided a hollow cylindrical waveguide, and a hollow cylindrical metal cylinder rotatably inserted into the waveguide. A first coupling hole and a second coupling hole are formed on both wall surfaces opposed to each other with respect to the axis of the first coupling hole and the first coupling hole at a predetermined distance in the axial direction from the positions of the first coupling hole and the second coupling hole. A third bonding hole and a fourth bonding hole are formed so as to be orthogonal to the second bonding hole, and the first bonding hole, the second bonding hole, the third bonding hole and the fourth bonding hole are each hollow. -Shaped branch waveguides are connected, a notch is formed at a position corresponding to the first coupling hole and the third coupling hole of the metal cylinder, and the surface thereof is formed on the central axis of the metal cylinder. A metal plate is provided so as to correspond to each notch individually.

The outer diameter of the metal cylinder is almost equal to the inner diameter of the waveguide, and the metal cylinder preferably has a driving means for applying a driving force when rotating in the waveguide. A low noise frequency converter can be connected to the waveguide.

[0007]

FIG. 4 shows the position of the notch of the metal cylinder during normal use.
Assuming that the position is 0 degree, the input H-polarized wave is prevented from traveling in the waveguide by the metal plate and is extracted from the first coupling hole. At this time, since the second coupling hole is closed by the metal cylinder, no radio wave is introduced into the branch waveguide. V polarization propagates without being affected by the metal plate,
Since it is blocked by the metal plate located at the rear, it is taken out of the third coupling hole and connected to the current low noise frequency converter through the branch waveguide coupled to the first coupling hole and the third coupling hole. You.

Here, when the metal cylinder is rotated by 180 degrees to the position shown in FIG. 5, the position of the notch of the metal cylinder is opposed to the second and fourth coupling holes, and the first and second coupling holes. The three connection holes are closed. Therefore, it is connected to a spare low-noise frequency converter via the branch waveguides connected to the second and fourth coupling holes.

As described above, the low-noise frequency converter can be switched from the working mode to the standby mode by simply rotating the hollow metal cylinder, so that it is not necessary to provide a waveguide switching device and the size can be reduced. be able to.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a configuration of an embodiment of the present invention, and FIG. 2 is a perspective view showing a configuration of a metal cylinder in the embodiment of the present invention.

The embodiment of the present invention relates to a hollow cylindrical waveguide 1.
And a hollow cylindrical metal cylinder 2 rotatably inserted into the inside of the waveguide 1. A first coupling hole 1a and a second coupling hole are formed in both wall surfaces facing each other with respect to the axis of the waveguide 1. A hole 1b is formed, and a third hole is formed at predetermined intervals in the axial direction from the positions of the first coupling hole 1a and the second coupling hole 1b and perpendicular to the first coupling hole 1a and the second coupling hole 1b. A coupling hole 1c and a fourth coupling hole 1d are formed, and a hollow branch waveguide 3 is connected to each of the first coupling hole 1a, the second coupling hole 1b, the third coupling hole 1c, and the fourth coupling hole 1d. Connection hole 1a and third connection hole 1c of metal cylinder 2
Notch 2a is formed at a position corresponding to
The metal plate 4 is provided on the central axis so that its surface individually corresponds to each of the notches 2a.

The outer diameter of the metal cylinder 2 is almost equal to the inner diameter of the waveguide 1. The metal cylinder 2 is provided with a driving means 5 for applying a driving force when rotating inside the waveguide 1.

FIG. 3 is a perspective view showing an example of the configuration of an antenna feed unit using the orthogonal polarization splitter of the embodiment of the present invention. The horn 7 is attached to the tip of the waveguide 1 in this manner, and the low-noise frequency converter 20 is fixed to each of the four branch waveguides 3 connected.

As described above, four coupling holes of the first coupling hole 1a, the second coupling hole 1b, the third coupling hole 1c, and the fourth coupling hole 1d are formed around the waveguide 1. Coupling hole 1
a and the second coupling hole 1b, and the third coupling hole 1c and the fourth coupling hole 1d are located at positions facing the axis of the waveguide 1, respectively. Further, the pair of the first coupling hole 1a and the second coupling hole 1b and the pair of the third coupling hole 1c and the fourth coupling hole 1d are orthogonal to each other, and the branch waveguides ( In this embodiment, a rectangular waveguide 3 is attached.

A metal cylinder 2 is inserted into the waveguide 1 so as to be in close contact with its inner wall, and the metal cylinder 2 is rotated by a driving means 5. The metal cylinder 2 is provided with a notch 2a around one of the opposing first and second coupling holes 1a and 2b, and one of the third and fourth coupling holes 1c and 1d.

Further, two metal plates (blocking plates) 4 are fixed inside the metal cylinder 2, and the two metal plates 4 pass through the centers of the first coupling hole 1a and the second coupling hole 1b, respectively. They are arranged so as to be perpendicular to a straight line and a straight line passing through the centers of the third coupling hole 1c and the fourth coupling hole 1d.

The input side end of each metal plate 4 is connected to the first coupling hole 1.
a and the second coupling hole 1b, the third coupling hole 1c and the fourth coupling hole 1d
Is disposed slightly behind (the driving means 5 side).

FIGS. 4A and 4B are views for explaining connection with the branch waveguide when the metal cylinder is at the 0 degree position in the embodiment of the present invention. A case where V-polarization and H-polarization are simultaneously input from the input terminal at the position of 0 degrees will be described.

The H-polarized light is prevented from traveling in the waveguide 1 by the metal plate 4 and is extracted from the branch waveguide 3 connected to the first coupling hole 1a. At this time, since the second coupling hole 1 b is closed by the metal cylinder 2, no radio wave is introduced into the branch waveguide 3. On the other hand, the V-polarized wave continues to propagate without being affected by the metal plate 4, is blocked by the rear metal plate 4, and is guided to the branch waveguide 3 through the third coupling hole 1c.
As described above, when the position of the metal cylinder is 0 degrees, the H-polarized light is output to the branch waveguide 3 connected to the first coupling hole 1a, and the V-polarized light is output to the branch connected to the third coupling hole 1c. Output to the waveguide 3.

FIGS. 5A and 5B show cross sections when the metal cylinder 2 in the embodiment of the present invention is located at a position of 180 degrees. In this case, the notched portion of the metal cylinder 2 is shown. 2a faces the second coupling hole 1b and the fourth coupling hole 1d opposite to the position shown in FIG. Therefore, the H polarization is output to the branch waveguide 3 connected to the second coupling hole 1b, and the V polarization is output to the branch waveguide 3 connected to the fourth coupling hole 1d.

[0021]

As described above, according to the present invention, it is possible to switch to a spare low-noise frequency converter simply by rotating a hollow metal cylinder without providing a waveguide switch, and thus a small-sized frequency converter can be used. There is an effect that can be made.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a metal cylinder in the embodiment of the present invention.

FIG. 3 is a perspective view illustrating a configuration example of an antenna feed unit using the orthogonal polarization splitter according to the embodiment of the present invention.

FIGS. 4A and 4B are cross-sectional views illustrating connection with a branch waveguide when a metal cylinder is at a 0-degree position in an embodiment of the present invention.

FIGS. 5A and 5B are cross-sectional views illustrating connection with a branch waveguide when a metal cylinder is rotated to a position of 180 degrees in an embodiment of the present invention.

FIG. 6 is a perspective view showing a configuration of a conventional example.

FIG. 7 is a diagram illustrating a configuration of an antenna supply unit using a conventional orthogonal polarization splitter.

FIG. 8 is a diagram showing a redundant configuration with a low-noise frequency converter using a conventional orthogonal polarization splitter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Waveguide 1a 1st coupling hole 1b 2nd coupling hole 1c 3rd coupling hole 1d 4th coupling hole 2 Metal cylinder 2a Notch part 3, 13 Branch waveguide 4, 14 Metal plate 5 Driving means 6 Cassegrain・ Antenna 7 Horn 9 Waveguide switch 10 Quadrature polarization splitter 20 Low noise frequency converter

Claims (4)

(57) [Claims] 1. A hollow cylindrical waveguide, and a hollow cylindrical metal cylinder rotatably inserted into the waveguide, and both wall surfaces facing each other with respect to an axis of the waveguide. A first coupling hole and a second coupling hole are formed at a predetermined distance in the axial direction from the positions of the first coupling hole and the second coupling hole and are orthogonal to the first coupling hole and the second coupling hole. A third coupling hole and a fourth coupling hole are formed, and a hollow branch waveguide is connected to each of the first coupling hole, the second coupling hole, the third coupling hole, and the fourth coupling hole. A notch is formed at a position corresponding to the first coupling hole and the third coupling hole of the metal cylinder, and a surface thereof individually corresponds to the notch on a central axis of the metal cylinder. A quadrature polarization splitter, wherein a metal plate is provided. 2. The orthogonally demultiplexer according to claim 1, wherein an outer diameter of the metal cylinder is substantially equal to an inner diameter of the waveguide. 3. The orthogonal polarization demultiplexer according to claim 1, wherein the metal cylinder includes a driving unit that applies a driving force when rotating inside the waveguide. 4. The orthogonal polarization demultiplexer according to claim 1, wherein a low noise frequency converter is connected to the branch waveguide.