JPS61251205A - Connection structure for microwave circuit - Google Patents

Abstract

PURPOSE:To connect stably a coaxial line and a grounding part of a strip line by coupling the coaxial line and the strip line while inserting an elastic conductor between an outer conductor of the coaxial line and the grounding base of the strip line and providing an external force providing means compressing the elastic conductor. CONSTITUTION:The coaxial line A and the strip line B are connected while an elastic conductor 4 is inserted between the outer conductor 1 of the coaxial line A and the ground base 8 of the strip line B and the external force giving means compressing the elastic conductor 4 is provided. For example, the grounding conductor 1 of the coaxia line A is connected electrically to the grounding base 8 of the strip line B via a plate spring 4. In this case, a primary radiation coaxial line A and the grounding base 8 of the strip line B are fixed to a case so as to receive an external force decreasing the distance between end faces. In giving the external force of this direction, a stress is caused in the plate spring 4 and the grounding conductor 1 and the grounding base 8 are connected surely electrically.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an improvement in a connection structure between a coaxial line and a string line board.

<Prior art> In recent years, with the practical use of satellite broadcasting, various satellite broadcasting receiving antennas have been developed and put into practical use. However, since the radio waves emitted from satellites are extremely weak, it is difficult to develop efficient receiving antennas. is desired.

Conventionally, a waveguide horn is usually used as a primary radiator in a satellite broadcast receiving antenna, and a converter is connected via this waveguide horn. However, in such a configuration, a coaxial waveguide converter is required at one end of the waveguide horn, and in the converter α1 to α3d
This resulted in a non-negligible conversion loss of B. Therefore, in order to eliminate this conversion loss, a structure was devised in which a primary radiator with a coaxial output terminal such as a helical antenna was used, and the primary radiator was directly connected to the converter's bass amplifier. .

By the way, the -order radiator and converter must be adjusted and adjusted individually.
Since the connecting ends are connected after evaluation, it is desirable to have a structure that allows for easy adjustment and reliable connection.

Figure 2 shows a conventional connection structure between the output end of a coaxial structure of a primary radiator and a strip line board forming one end of a low-noise amplifier; b
) is a side view. 1 is an outer conductor, 2 is a dielectric layer, and 3 is a center conductor, which form the output terminal A of the -order radiator and have a coaxial line structure. On the other hand, a strip conductor center 5 and a dielectric substrate 6. Ground conductor 7
There is.

These are closely attached to the ground base 8 by screws 12a, 12b, 12c, and 12d, and the ground conductor 7 is electrically integrally connected to the ground base 8. Here, the center conductor 3 is connected to the strip center conductor 5 with solder 9, and the outer conductor 1 is connected to the ground base 8 and the contact surface 1.
3 and are connected in surface contact.

<Problems with the Prior Art> Here, it is necessary to completely connect the grounding parts of the coaxial line and the strip line, but in the conventional structure shown in FIG. Since the grounding wire is connected by surface contact, there is a drawback that it lacks reliability against mechanical vibrations.

<Object of the Invention> The present invention has been made to overcome these drawbacks, and aims to realize a connection structure that is resistant to mechanical vibration at low cost.

<Example> Hereinafter, an example of a connection structure for a microwave circuit according to the present invention will be explained in detail using the drawings. ＠1 (a) is an example of a connection structure for a microwave circuit according to the present invention. It is an external perspective view showing an example. 1 is the ground conductor of the coaxial line A forming the output terminal of the primary radiator in the satellite broadcasting antenna;
2 is a dielectric layer, and 3 is a center conductor. Further, 5 is a strip center conductor, 6 is a dielectric substrate, 7 is a ground conductor, and 8 is a ground base. 7 and 8 are electrically integrated, and a strip line B is configured by these. However, this strip line B constitutes an input terminal of a low-noise amplifier or a part of the low-noise amplifier. The ground base 8 is provided to increase the contact area, and is a part of a casing formed inside the converter that includes the low noise amplifier and converts radio waves in the 12 GHz band into signals in the IGHz band. Although it may be used for both purposes, it is necessary that it is electrically connected to at least the ground conductor 7. Reference numeral 4 designates a leaf spring whose one end is fixed in contact with the ground conductor l and whose other end is partially bent into an arc shape. FIG. 2B is a side view of the coaxial line A forming the output terminal of the -order radiator and the strip/tube line B connected to each other. The ground conductor of the coaxial line A is electrically connected to the ground base 8 of the strip line B through the leaf spring 4 by contact.

Further, the center conductor 3 of the coaxial line A is connected to the strip center conductor 5 of the strip line B by solder 9 (another means may be used). At this time, the coaxial line A of the -order radiator and the ground base 8 of the strip line B are fixed to the casing inside the converter so as to receive an external force in a direction that reduces the distance between their respective end faces. By applying this external force, stress (restoring force) is generated in the leaf spring 4, and the ground conductor 1 and the ground base 8 are reliably electrically connected. The above structure provides a connection structure that is stable against vibrations.

FIG. 3 #FIGS. 4 and 5 show various other embodiments of the connection structure of the microwave circuit according to the present invention.

In each figure, (a) is an external perspective view, and (b) is a side view.

In each figure, the same components as in Figure 1 are indicated by the same symbols. In FIG. 13, reference numeral 14 denotes a leaf spring, one end of which is bent into an L-shape, and the bent portion 14a is hooked to the end position of the strip line B.

On the other hand, the other end 14b is bent into an arc shape. This curved portion 14b has elasticity, and the ground base 8 of the coaxial line A and the strip line B of the -order radiator receives an external force in the direction in which the distance between the respective end faces is reduced, so that stress is applied to the leaf spring 14. occurs. Due to this generated stress, the ground conductor 1 of the coaxial line A and the ground base 8 of the strip line B are firmly electrically connected, and are stable even under vibration.

Next, in FIG. 4, 15 is a leaf spring, and the coaxial line A
The ground conductor 1 is housed in a groove 16 provided in a part of the ground conductor 1. The leaf spring 15 protrudes somewhat from the groove 16, and when the ground bases 8 of the coaxial line A and the strip line B receive an external force in a direction that reduces the distance between their respective end faces, stress is applied to the leaf spring 15. occurs. This generated stress causes the ground conductor 1 of the coaxial line A and the ground base 8 of the strip line B to
It has a strong electrical connection and is stable even under vibration.

Next, in FIG. 5, 17 is a metal mesh, and the ground conductor l of the coaxial line A and the ground base 8 of the strike V-tube line B.
caught between. Here, coaxial line A and S) +7
Stress is generated in the metal mesh 17 when the grounding pace 8 of the strip line B receives an external force in a direction that reduces the distance between the respective end faces.

Due to this generated stress, the ground conductor 1 of the coaxial line A and the ground base 8 of the strip line B are firmly electrically connected, and are stable even when subjected to vibrations.

Effects> According to the present invention described above, the grounding portion between the coaxial line and the slip line can be stably connected.

[Brief explanation of the drawing]

1, 3, 4, and 5 each show an example of a connection structure for a microwave circuit according to the present invention, and (
(a) is an external perspective view, (b) is a side view, @2 is an external perspective view, and (b) is a side view. In the figure, 1: Outer conductor 2: Dielectric layer 3: Center conductor
4: Leaf spring 5 strip conductor center 6: Dielectric substrate 7: Ground conductor 8: Grounding pace 9: Solder agent Patent attorney Yoshihiko Fukushi (and 2 others) (b) Figure 1 (a) (b) Figure 2 (b) Figure 3 Δ (b) Figure 4

Claims (1)

[Claims] 1. The coaxial line and the strip line are coupled by interposing an elastic conductor between the outer conductor of the coaxial line and the ground base of the strip line, and an external force applying means for compressing the elastic conductor is provided. Connection structure of microwave circuit.