JPH04360301A - Strip line - Google Patents

Abstract

PURPOSE:To improve the high frequency characteristic and to reduce the dispersion in the characteristic by forming a recessed groove on one major side of an insulation board at a prescribed pattern and forming a microstrip line in the recessed groove. CONSTITUTION:A recessed groove 2 is formed to one major side of an insulation board 1 at a prescribed pattern and a microstrip line 3 is imbeded in the recessed groove 2. The width and thickness of the microstrip line 3 are decided depending on the width and depth of the recessed groove 2 by forming the microstrip line 3 in the recessed groove 2 in this way and the accuracy of the width of the line is improved. Since the thickness of the line is optionally set, it is possible to decrease the electric resistance and to reduce the transmission loss by increasing the thickness.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip line used for high frequency power transmission.

0002

2. Description of the Related Art FIG. 3 is a perspective view showing a conventional strip line, and FIG. 4 is a sectional view taken along line BB in FIG. In these figures, 1 is an insulating substrate, for example, a dielectric substrate such as an alumina ceramic substrate is used. 3 is a microstrip line, and 4 is a grounding conductor film.

The upper and lower surfaces of the insulating substrate 1 having a constant dielectric constant are covered with microstrip lines 3 and grounding conductors formed by printing and sintering Ag-Pt (silver-platinum) alloy paste, for example. It consists of a membrane 4. The required length of the microstrip line 3 depends on its thickness, width, and insulating substrate 1.
It is determined by the dielectric constant of the substrate, the thickness of the substrate, etc.

0004

[Problems to be Solved by the Invention] The conventional microstrip line 3 as described above is formed by printing a paste on the insulating substrate 1, so it is necessary to improve the accuracy of the line width and increase the line thickness. There were problems such as not being able to do so.

The present invention has been made to solve the above-mentioned problems, and aims to provide a strip line that has improved high frequency characteristics and prevents variations.

[0006]

[Means for Solving the Problems] A strip line according to the present invention is one in which a predetermined pattern of grooves is provided on one main surface of an insulating substrate, and a microstrip line is formed in the groove.

[0007]

[Operation] In the strip line according to the present invention, since the microstrip line is formed in the groove formed on one main surface of the insulating substrate, the accuracy of the line width is improved and variations in high frequency characteristics can be prevented. In addition, the line thickness can be increased, resulting in lower electrical resistance, lower transmission loss, and improved high frequency characteristics.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a strip line according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. In FIG. 1, reference numerals 1, 3, and 4 are the same as those in FIG. 3, so explanations thereof will be omitted. Reference numeral 2 indicates a groove formed in the insulating substrate 1. The groove 2 is formed in a predetermined pattern on one main surface of the insulating substrate 1, and a microstrip line 3 is embedded in the groove 2. .

By forming the microstrip line 3 in the groove 2 in this way, the width and thickness of the microstrip line 3 are determined by the width and depth of the groove 2.
The accuracy of track width is improved compared to the conventional method. Furthermore, since the line thickness can be set arbitrarily, it is also possible to increase the thickness and reduce transmission loss compared to the conventional line.

0010

As explained above, in the present invention, grooves are formed in a predetermined pattern on one main surface of an insulating substrate, and microstrip lines are formed in the grooves, so that the width and depth of the grooves can be changed. This allows the width and thickness of the transmission line to be controlled with high precision, and has the effect of improving high frequency characteristics and reducing variations in characteristics.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing a strip line according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is an external perspective view of a conventional strip line.

FIG. 4 is a sectional view taken along line BB in FIG. 3;

[Explanation of symbols]

1 Insulating substrate 2 Concave groove 3 Microstrip line 4 Grounding conductor film

Claims (1)

[Claims] 1. A strip line used for high-frequency power transmission, characterized in that a groove of a predetermined pattern is formed on one main surface of an insulating substrate, and a microstrip line is formed in the groove. .