JPS6029202Y2 - Directional coupler line structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a directional coupler line structure having stable characteristics.

Conventional directional couplers for microwave strip lines have a structure in which a strip line with a predetermined pattern is housed in a case, or is held in place by a metal case on the outside, as shown in the external view in Figure 1. .

In the figure, 1 is an outer insulating substrate, 2 is an inner insulating substrate, and 3 is an outer insulating substrate.
4 is a strip conductor, 4 is an external connection conductor, 5 is a ground conductor, and 7 and 8 are conductive metal fittings.

Further, FIG. 2 is an exploded view of FIG. 1. As shown in these figures, insulating substrates 1 and 2 are stacked, and conductive metal fittings 7,
8, thereby pressing the insulating substrates 1 and 2.

Because these metal fittings are used in this way, the configuration becomes complicated, and when the temperature of each insulating substrate changes, due to the difference in thermal expansion coefficient between the insulating material of the insulating substrate, the conductive material, and the metal fittings,
This has the disadvantage that the deformation causes gaps between the respective insulating substrates, and the size of the gaps changes, making the characteristics such as the degree of coupling and directionality of the directional coupler unstable.

In order to solve these drawbacks, the present invention provides a directional coupler line in which the respective insulating substrates are bonded together and the ground conductors of the insulating substrates arranged at both ends are connected by flexible electrical conductivity.

The present invention will be explained in detail below with reference to the drawings.

FIG. 3 shows an embodiment of the present invention, in which the same numbers as in FIG. 1 indicate the same components, and 6 is a ground conductor connection conductor.

Here, the outer insulating substrate 1 and the inner insulating substrate 2 are bonded together, and the ground conductor 5 and the ground conductor connecting conductor 6 are connected by a method such as soldering or welding.

The connecting conductor 6 may be a conducting wire or a conductive foil as long as it is electrically connectable and mechanically flexible.

Because of this structure, there is no need for metal fittings to glue and fix the entire directional coupler, and it is inexpensive because it does not loosen or create gaps due to temperature changes or deformation due to external stress. A directional coupler with stable characteristics can be created.

FIG. 4 shows an embodiment of the present invention, in which the directional coupler is arranged between other boards 11 and 12 on which electrical components 9 and 10 are arranged.

As described above, the high frequency board according to the present invention can be constructed in a small size, so that it can be incorporated into other electric circuits.

Note that the inner insulating substrate 2 and the lower outer insulating substrate 1 may be integrated, and the lower surface of one insulating substrate may be used as the conductive surface 5 and the upper surface may be used as the strip line 3.

It is also possible to provide a through hole in a part of the outer insulating substrate and to arrange electrical components in the inner insulating substrate corresponding to the through hole.

[Brief explanation of the drawing]

Fig. 1 is an external view of a conventional directional coupler, Fig. 2 is an internal exploded view of Fig. 1, Fig. 3 is a perspective view of an embodiment of the present invention, and Fig. 4
The figure shows another embodiment of the invention. In the figure, 1... outer insulating substrate, 2...
...Inner insulating substrate, 3... Strip conductor,
4...External connection conductor, 5...Ground conductor, 6...Ground conductor connection conductor, 7, 8...
... Conductive metal fittings, 9, 10 ... Electrical parts, 11
, 12...Substrate.

Claims (1)

[Scope of utility model registration request] a first dielectric substrate provided with a predetermined pattern of strip lines on at least one side; at least one second dielectric substrate disposed opposite to the surface of the strip line; at least two conductive surfaces formed on the outermost part of the dielectric substrate;
A directional coupler line structure comprising: adhesive means for insulating and bonding dielectric substrates; and flexible conductor connecting means for connecting the outer conductor surfaces of these bonded dielectric substrates to each other.