JP2020005083A - Waveguide-transmission line converter - Google Patents

Abstract

To provide a waveguide-transmission line converter, capable of easily being miniaturized, in which a restriction on an insertion direction of the transmission line into the waveguide is eliminated.SOLUTION: A second dielectric substrate 4 on which a probe 8 is formed is arranged in a waveguide 1. A microstrip line 5 formed on a first dielectric substrate 3 and the probe 8 are connected via a conductor 9.EFFECT: A height of a shield frame 2 is reduced, and a size thereof can be reduced. In addition, there is no restriction on a direction in which a microstrip line 5 is inserted into a waveguide 1, and a degree of freedom in design increases.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a waveguide-transmission line converter, and more particularly, to a miniaturized waveguide-transmission line converter.

  Conventionally, a transmission line such as a microstrip line has been used for the configuration of an internal circuit of a microwave component of several GHz or more, such as a low noise block down converter (LNB) or a block up converter (BUC) for satellite communication. A waveguide with a small insertion loss is used for the interface. Therefore, a waveguide-transmission line converter for mutually converting the waveguide and the transmission line between them is used. For example, Patent Document 1 discloses a waveguide-transmission line converter using a microstrip line as a transmission line. As shown in FIG. 5 ((a) is a cross-sectional view and (b) is a plan view of a dielectric substrate), this waveguide-transmission line converter has a short-circuited surface formed by a shield frame 2 on a waveguide 1. The dielectric substrate 12 and the microstrip line 5 formed on the substrate are extended and inserted into the waveguide 1, and the tip of the line becomes the probe 8. According to such a structure, there is an advantage that the waveguide-transmission line converter can be realized simply and inexpensively.

Japanese Utility Model Publication No. 61-93005

  By the way, in the above-described waveguide-transmission line converter, the distance between the probe 8 and the short surface 6 needs to be about １ ／ of the wavelength in the waveguide. The height from the probe 8 corresponds to about １ ／ of the wavelength in the waveguide. Further, when a radiating fin (not shown) for suppressing a temperature rise due to heat generated by a circuit element or the like (not shown) connected to the transmission line is provided, the radiating fin is arranged in the same direction as the extending direction of the waveguide 1. Since the radiation fins are arranged to extend, the waveguide 1 becomes as long as the radiation fins. For this reason, there has been a problem that it is difficult to reduce the size of the waveguide-transmission line converter. Also, the probe at the tip of the transmission line must be inserted from the long side of the waveguide parallel to the short side and perpendicular to the tube axis, and the insertion direction of the transmission line into the waveguide is limited, There was a problem that the degree of freedom in design was low. SUMMARY OF THE INVENTION It is an object of the present invention to provide a waveguide-transmission line converter that can easily be reduced in size and eliminates the limitation on the direction in which the transmission line is inserted into the waveguide.

  In order to achieve the above object, the invention according to claim 1 of the present application is directed to a first dielectric having a waveguide open at both ends, a first dielectric sandwiched between one end of the waveguide and a shield frame, and forming a transmission line. An electrical substrate, a second dielectric substrate disposed in the waveguide, and having a probe of a predetermined length formed in a direction perpendicular to the tube axis of the waveguide, and the transmission line and the probe electrically connected to each other. The shield frame is a short-circuit surface of the waveguide.

  According to a second aspect of the present invention, in the waveguide-transmission line converter according to the first aspect, a ground conductor of the transmission line is a short surface of the waveguide.

  According to a third aspect of the present invention, in the waveguide-transmission line converter according to any one of the first and second aspects, the conductor is disposed in a cavity provided in a wall of the waveguide. It is characterized by having.

  In the waveguide-transmission line converter of the present invention, the shield frame is formed by forming a probe connected to the transmission line formed on the first dielectric substrate on the second dielectric substrate arranged in the waveguide. The height can be reduced and the size can be reduced.

  Further, since the probe is formed on the second dielectric substrate, there is no restriction on the direction in which the transmission line formed on the first dielectric substrate is inserted into the waveguide, and the degree of freedom in design increases. .

FIG. 2 is an explanatory diagram of a waveguide-transmission line converter according to the first embodiment of the present invention. FIG. 2 is an explanatory diagram of a waveguide-transmission line converter according to the first embodiment of the present invention. FIG. 6 is an explanatory diagram of a waveguide-transmission line converter according to a second embodiment of the present invention. FIG. 11 is an explanatory diagram of a waveguide-transmission line converter according to a third embodiment of the present invention. It is explanatory drawing of the conventional waveguide-transmission line converter.

  In the waveguide-transmission line converter according to the present invention, the probe connected to the transmission line is formed on the second dielectric substrate arranged in the waveguide, so that the shield frame can be reduced in height and downsized. It becomes. Hereinafter, examples will be described in detail.

  A first embodiment of the present invention will be described. FIG. 1 is an explanatory view of a first embodiment of the present invention. FIG. 1A is a sectional view of a waveguide-transmission line converter, and FIG. The plan views of the first dielectric substrate are respectively shown. As shown in FIG. 1A, the waveguide-to-transmission line converter according to the present embodiment has a first dielectric substrate sandwiched between one end of a waveguide 1 having both open ends and a shield frame 2. 3, and a second dielectric substrate 4 in the waveguide 1. The microstrip line 5 is formed on the surface of the first dielectric substrate 3 (the surface not in contact with the waveguide 1), and the ground conductor 7 is provided on the back surface (the surface in contact with the waveguide 1). I have. Here, in the waveguide 1, the ground conductor 7 is provided only on the back surface portion corresponding to the portion where the microstrip line 5 is formed, and the shield frame 2 serves as the short surface 6 of the waveguide 1. Further, a probe 8 is formed on the second dielectric substrate 4 in a direction orthogonal to the tube axis of the waveguide 1. FIG. 1A shows the probe 8 formed on the back surface of the second dielectric substrate 4 (the surface not facing the first dielectric substrate 3). May be formed on the surface of the dielectric substrate 4 (the surface facing the first dielectric substrate 3). Here, the second dielectric substrate 4 is arranged such that the distance between the short surface 6 and the probe 8 formed on the second dielectric substrate 4 is about １ ／ of the wavelength in the waveguide. Is done. The second dielectric substrate 4 may be disposed in the waveguide 1 by separating the waveguide 1 in a direction perpendicular to the tube axis and sandwiching the separated waveguide.

  Then, as shown in FIG. 1B, the microstrip line 5 formed on the surface of the first dielectric substrate 3 is patterned so as to surround the conductor 9, so that the conductor 9 is electrically connected to the microstrip line 5. 1A, the conductor 9 and the ground conductor 7 are insulated by not patterning the ground conductor 7 formed on the back surface of the first dielectric substrate 3 on the peripheral portion 10 of the conductor 9 as shown in FIG. Further, by electrically connecting the conductor 9 to the probe 8 formed on the second dielectric substrate 4, the microstrip line 5 formed on the surface of the first dielectric substrate 3 via the conductor 9 and the second The probe 8 formed on the dielectric substrate 4 is electrically connected.

  In the waveguide-transmission line converter having such a structure, the shield frame 2 is formed by forming the probe 8 connected to the microstrip line 5 on the second dielectric substrate 4 arranged in the waveguide 1. The height can be reduced and the size can be reduced.

  Further, since the probe 8 is formed on the second dielectric substrate 4, the microstrip line 5 formed on the first dielectric substrate 3 is inserted into the waveguide 1 as shown in FIG. 2, for example. This is also possible from the short side of the waveguide 1. That is, there is no restriction on the insertion direction, and the degree of freedom in design increases.

  Next, a second embodiment of the present invention will be described. FIG. 3 is a sectional view of a waveguide-transmission line converter according to a second embodiment of the present invention. As shown in FIG. 3, the waveguide-transmission line converter according to the present embodiment is similar to the first embodiment described above in that the waveguide-transmission line converter is sandwiched between one end of a waveguide 1 having both open ends and a shield frame 2. One dielectric substrate 3 is arranged, and a second dielectric substrate 4 is arranged in the waveguide 1. The first dielectric substrate 3 has a microstrip line 5 formed on the surface. Further, a probe 8 is formed on the second dielectric substrate 4 in a direction orthogonal to the tube axis of the waveguide 1. In this embodiment, a ground conductor 7 is provided on the entire back surface of the first dielectric substrate 3, and this ground conductor 7 is a short surface 6. The ground conductor 7 is not patterned on the periphery 10 of the conductor 9 to insulate the conductor 9 from the ground conductor 7.

  In the waveguide-transmission line converter of the present invention having such a structure, the probe 8 connected to the microstrip line 5 is formed on the second dielectric substrate 4 arranged in the waveguide, and By using the short surface 6 as the ground conductor 7 of the microstrip line 5, it is not necessary to form a short surface with the shield frame 2, and the size can be reduced.

  Further, since the probe 8 is formed on the second dielectric substrate 4, the insertion of the microstrip line 5 formed on the first dielectric substrate 3 into the waveguide is performed, for example, on the short side of the waveguide 1. It is also possible from the side. That is, there is no restriction on the insertion direction, and the degree of freedom in design increases.

  Next, a third embodiment of the present invention will be described. FIG. 4 is a sectional view of a waveguide-to-transmission line converter according to a third embodiment of the present invention. As shown in FIG. 4, the waveguide-transmission line converter according to the present embodiment includes a microstrip line 5 formed on the first dielectric substrate 3 and a second dielectric substrate 4 in the first embodiment. The structure is such that a conductor 9 for electrically connecting the formed probe 8 is arranged in a cavity 11 provided in the wall of the waveguide 1.

  The waveguide-to-transmission line converter of the present invention having such a structure has a second dielectric member in which the probe 8 connected to the microstrip line 5 is disposed in the waveguide 1 similarly to the first embodiment. By forming the shield frame 2 on the body substrate 4, the height of the shield frame 2 can be reduced and the size of the shield frame 2 can be reduced.

  Further, the conductor 9 in the second embodiment may be arranged in a cavity provided in the wall of the waveguide 1 similarly to the present embodiment.

  The waveguide-to-transmission line converter of the present invention having such a structure has a second dielectric substrate in which a probe 8 connected to the microstrip line 5 is disposed in the waveguide, as in the second embodiment. 4 and the short-circuit surface 6 of the waveguide 1 is used as the ground conductor 7 of the microstrip line 5, so that it is not necessary to form a short-circuit surface with the shield frame 2 and the size can be reduced.

  In addition, since the probe 8 is formed on the second dielectric substrate 4, the insertion of the microstrip line 5 formed on the first dielectric substrate 3 into the waveguide 1 is performed, for example, by shortening the waveguide 1. It is also possible from the side. That is, there is no restriction on the insertion direction, and the degree of freedom in design increases.

  Although the embodiment of the present invention has been described above, it is needless to say that the present invention is not limited to the above embodiment of the present invention. Specifically, a microstrip line is formed on the back surface of the first dielectric substrate, and It is also possible to provide a ground conductor at the bottom. It is also possible to form a microstrip line on the surface of the first dielectric substrate and cover the entire surface of the first dielectric substrate with a conductive material so as to insulate it from the microstrip line to form a short surface. . Furthermore, the conductor electrically connected to the microstrip line and the probe is not limited to a conductor formed only of a conductor. For example, a conductor is provided only on the surface, a conductor other than the surface is provided, or a linear conductor is provided on the insulator. It is also possible. Further, in the above embodiment, the case where the microstrip line is used as the transmission line has been described, but a coplanar line may be used.

1: waveguide, 2: shield frame, 3: first dielectric substrate, 4: second dielectric substrate, 5: microstrip line, 6: short surface, 7: ground conductor, 8: probe, 9 : Conductor, 10: peripheral portion, 11: hollow portion, 12: dielectric substrate

Claims (3)

A waveguide open at both ends,
A first dielectric substrate sandwiched between one end of the waveguide and a shield frame and forming a transmission line;
A second dielectric substrate disposed in the waveguide, and having a probe of a predetermined length formed in a direction orthogonal to the tube axis of the waveguide;
A conductor that electrically connects the transmission line and the probe,
A waveguide-transmission line converter, wherein the shield frame is a short surface of the waveguide. The waveguide-transmission line converter according to claim 1,
A waveguide-transmission line converter, wherein a ground conductor of the transmission line is a short surface of the waveguide. The waveguide-transmission line converter according to claim 1 or 2,
A waveguide-transmission line converter, wherein the conductor is arranged in a cavity provided in a wall of the waveguide.

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