JPH04245802A - Circularly polarized wave/linearly polarized wave converter - Google Patents

Abstract

PURPOSE:To attain miniaturization by installing a phase shift circuit for converting a circularly polarized wave into a linearly polarized wave in a circular waveguide, and making one end of the phase shift circuit an opening for inputting/outputting the circularly polarized wave, and joinning the other end to a rectangular waveguide through a slit. CONSTITUTION:A primary radiator 1 is made into the shape of a horn, and the phase shift circuit for converting the circularly polarized wave into the linearly polarized wave is installed in the inside of the circular waveguide 2. A pair of nearly semicylindrical metallic blocks 6 and 7 are installed on the inner wall part of the circular waveguide 2 as the phase shift circuit, and the length of the metallic blocks 6 and 7 in a longitudinal direction is made the length enough to convert the radio wave of the circularly polarized wave into the radio wave of the linearly polarized wave. At the time of receiving a satellite broadcast radio wave, the radio wave of the circularly polarized wave introduced into the primary radiator 1 is converted into the linearly polarized wave by the phase shift circuit, and the converted radio wave of the linearly polarized wave is led to the rectangular waveguide 5 through the slip 4 installed in contact with the surface of the phase shift circuit, and a satellite broadcast signal is transmitted to a BS converter.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a circularly polarized wave/linearly polarized wave converter using a waveguide, and when used on the receiving side, converts circularly polarized wave to linearly polarized wave. The present invention relates to a device that can be used as a circularly polarized wave generator, and when used on the transmitting side, can be used as a circularly polarized wave generator that converts linearly polarized waves into circularly polarized waves and radiates circularly polarized waves.

0002

2. Description of the Related Art In a conventional circularly polarized wave/linearly polarized wave converter, as shown in FIG. A circular waveguide 2 and a rectangular waveguide 21
A primary radiator 1 is connected to one end of a circular waveguide 2, and a coupling slit 19 is connected to the other end of the circular waveguide 2.
When receiving satellite broadcast radio waves, the circularly polarized radio waves guided to the primary radiator 1 are converted into linearly polarized waves by the phase circuit 3, and then passed through the slit 19. The converted linearly polarized radio waves were guided into the rectangular waveguide 21 to transmit satellite broadcasting signals to the BS converter.

0003

[Problem to be Solved by the Invention] Therefore, the circular waveguide 2
Since a space 20 is provided inside the circular waveguide 2 for impedance matching, the length of the circular waveguide 2 becomes long, and the structure of the phase circuit 3 provided inside the circular waveguide 2 is made circular. When using a waveguide that is integrally constructed with the waveguide 2, in addition to the mold corresponding to the phase circuit 3 part, the space part 2
There was a problem that a mold corresponding to 0 was required, which increased the number of molds and made processing difficult. In the present invention, the space portion 20 for so-called impedance matching is deleted and the rectangular waveguide 21 and the phase circuit 3 are directly connected. In addition, when the structure of the phase circuit 3 provided inside the circular waveguide 2 is integrated with the circular waveguide 2, the length can be shortened. The purpose of the present invention is to provide a small and economical circularly polarized wave/linearly polarized wave converter that eliminates the need for a mold and is easy to process.

0004

[Means for Solving the Problems] FIG. 1 is a diagram explaining the principle of the present invention. As shown in the figure, a phase circuit for converting circularly polarized waves into linearly polarized waves is provided inside a circular waveguide 2. 3, one end of the in-phase circuit 3 is an opening that can input and output circularly polarized waves,
The other end of the in-phase circuit 3 is directly connected to a rectangular waveguide 5 via a coupling slit 4.

[0005]

[Operation] With the above-described configuration, the present invention converts circularly polarized waves into linearly polarized waves or linearly polarized waves into circularly polarized waves. The impedance matching at the junction between the phase circuit and the rectangular waveguide is determined by the length of the slit in the longitudinal direction, the width of the slit, the thickness of the material of the slit, and the rectangular waveguide to be joined. The installation position of the slit is adjusted to match the position of the slit. Therefore, the space provided inside the circular waveguide for so-called impedance matching becomes unnecessary, the length of the circular waveguide can be shortened, and the structure of the phase circuit provided inside the circular waveguide is eliminated. When using a device that is integrated with a circular waveguide,
There is no need for a mold in the space, making processing easier.

[0006]

[Embodiment] Fig. 2 is a partially cutaway perspective view showing an embodiment of the circularly polarized wave/linearly polarized wave converter for right-handed circularly polarized waves according to the present invention. and a circular waveguide 2 equipped with a phase circuit for converting circularly polarized waves into linearly polarized waves.
A primary radiator 1 is connected to one end of the circular waveguide 2, and a rectangular waveguide is connected to the other end of the circular waveguide 2 through a coupling slit 4. 5 is joined and when receiving satellite broadcast radio waves, the circularly polarized radio waves guided to the primary radiator 1 are converted into linearly polarized waves by a phase circuit, and the slit 4 provided in contact with the surface of the same phase circuit is used. The converted linearly polarized radio waves are guided to the rectangular waveguide 5 through the rectangular waveguide 5, and the satellite broadcasting signal is transmitted to the BS converter.

In the example shown in FIG. 2, a pair of substantially semi-cylindrical metal blocks 6 and 7 are provided on the inner wall of the circular waveguide 2 as a phase circuit, and the lengths of the metal blocks 6 and 7 in the longitudinal direction are The length is such that circularly polarized radio waves are converted to linearly polarized radio waves. FIG. 3 is a front view of the circularly polarized wave/linearly polarized wave converter for right-handed circularly polarized waves shown in FIG. 6 and 7 are attached, and the center line 15 of the metal blocks 6 and 7 passing through the center of the waveguide 2 and the longitudinal center line 14 of the slit 4 are 4
They are arranged to form an angle of 5 degrees.

FIG. 4 is a front view showing an embodiment of the circularly polarized wave/linearly polarized wave converter for left-handed circularly polarized waves according to the present invention. Metal blocks 6 and 7 as well as vessels
A pair of approximately circular arcs are formed on opposing circular arc portions of the inner wall of the waveguide 2 so that the center line 15 passing through the center of the waveguide 2 and the longitudinal center line 14 of the slit 4 form an angle of 45 degrees. Scythe-shaped metal blocks 6 and 7 are attached, and the one for right-handed circularly polarized waves has a center line 15 that is upward to the left with respect to the center line 14, whereas the one for left-handed circularly polarized waves has a center line 15 that is upward to the left with respect to the center line 14. The thing is the center line 1
4, the center line 15 slopes upward to the right.

FIG. 5 is an explanatory diagram showing the connection between the circularly polarized wave/linearly polarized wave converter of the present invention and the rectangular waveguide, and FIG.
The rectangular waveguide 5 is coupled to the waveguide 2 in a direction perpendicular to the direction of propagation of radio waves in the waveguide 2, whereas in the case of FIG. The rectangular waveguide 9 is coupled to the waveguide 2 so that the
The waveguide 2 and the rectangular waveguide may be connected by either the method shown in FIG. 1 or the method shown in FIG. 5.

FIGS. 6 and 7 are perspective views showing an embodiment of a coupling slit between a circularly polarized wave/linearly polarized wave converter and a rectangular waveguide according to the present invention. For,
In the case of FIG. 6, the slit 12 is provided on the side surface parallel to the long side of the rectangle so that the center line 10 in the longitudinal direction of the slit 12 is parallel to the long side of the rectangle. In the case of No. 7, the slit 13 is provided on the side surface parallel to the short side of the rectangle so that the center line 10 in the longitudinal direction of the slit 13 is perpendicular to the short side of the rectangle. When the waveguide 11 is coupled to the waveguide 2 in FIG. 4, the centerline 10 of the slit 12 or 13 of the waveguide 11 is aligned with the centerline 14 of the slit 4 in FIGS. 3 and 4. do it like this. An example of a phase circuit that can be used in the circularly polarized wave/linearly polarized wave converter of the present invention is a phase circuit that is generally used in a circularly polarized wave/linearly polarized wave converter, and is a substantially semi-cylindrical metal phase circuit as shown in FIG. One of the blocks is attached to the arc of the inner wall of the waveguide 2, or a dielectric plate is used, and the center line of the cross section of the dielectric plate is arranged so that it matches the center line 15 in FIG. There is one in which the length in the direction is the length at which a circularly polarized radio wave is converted into a linearly polarized radio wave.

[0011]

As explained above, according to the present invention, the phase circuit of the circularly polarized wave/linearly polarized wave converter is directly connected to the rectangular waveguide via the coupling slit, and the phase circuit The length of the waveguide section of the circularly polarized wave/linearly polarized wave converter can be shortened by the fact that there is no space between the waveguide and the rectangular waveguide. When using a circuit structure that is integrated with the waveguide, there is no need for a mold for the space, making it easier to process. A polarization converter can be provided.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the principle of a circularly polarized wave/linearly polarized wave converter according to the present invention.

FIG. 2 is a partially cutaway perspective view showing an embodiment of a circularly polarized wave/linearly polarized wave converter for right-handed circularly polarized waves according to the present invention.

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a front view showing an embodiment of a circularly polarized wave/linearly polarized wave converter for left-handed circularly polarized waves according to the present invention.

FIG. 5 is an explanatory diagram showing the connection between the circularly polarized wave/linearly polarized wave converter of the present invention and a rectangular waveguide.

FIG. 6 is a perspective view showing an embodiment of a coupling slit between a circularly polarized wave/linearly polarized wave converter and a rectangular waveguide according to the present invention.

FIG. 7 is a perspective view showing another embodiment of a coupling slit between a circularly polarized wave/linearly polarized wave converter and a rectangular waveguide according to the present invention.

FIG. 8 is an explanatory diagram showing a conventional circularly polarized wave/linearly polarized wave converter.

[Explanation of symbols]

1 Primary radiator 2 Circular waveguide 3 Phase circuit 4 Slit 5　Rectangular waveguide 6　Kamaboko-shaped metal plate 7　Kamaboko-shaped metal plate 8 Notch line 9 Square waveguide 10 Center line 11 Square waveguide 12 Slit 13 Slit 14 Center line 15 Center line 19 Slit 20 Space section 21 Square waveguide

Claims (2)

[Claims] Claim 1: A phase circuit for converting circularly polarized waves into linearly polarized waves is provided inside a circular waveguide, and one end of the phase circuit is an opening through which the circularly polarized waves can be input and output. A circularly polarized wave/linearly polarized wave converter characterized in that the other end is connected to a rectangular waveguide via a coupling slit. 2. The phase circuit is made of a substantially semi-cylindrical metal block, the length in the longitudinal direction of the metal block is a length at which a circularly polarized radio wave is converted into a linearly polarized radio wave, and the circular waveguide The metal lump is attached so that at least one arc of the inner surface of the tube is a plane, and the metal block is arranged so that an extension of the plane and the longitudinal center line of the slit form an angle of 45 degrees. The circularly polarized wave/linearly polarized wave converter according to claim 1.