JP2001196814A - Impedance adjusting circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of the impedance adjusting circuit of a coplanar line where the adjustment of a strip conductor pattern width is difficult in producing though there is a method for adjusting the strip conductor pattern width. SOLUTION: In the coplanar line consisting of a strip conductor pattern and a base conductor pattern on a dielectric, the base conductor pattern is notched and the upper part of the notch is connected with a golden ribbon, which is cut off on impedance adjustment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit for adjusting the impedance of a coplanar line.

[0002]

2. Description of the Related Art FIGS. 5 and 6 are block diagrams showing a conventional impedance adjusting circuit for a coplanar line. In FIG. 5, 1 is a dielectric, 2 is a strip conductor pattern, 3 is an air gap, 4 is a ground conductor pattern, 5 is a first adjustment unit, and a strip conductor pattern 2 and a strip conductor pattern 2 In a coplanar line composed of a ground conductor pattern 4 provided on the same plane with a gap 3 parallel to the left and right of the strip conductor pattern 2, the strip conductor pattern 2 is arranged on the strip conductor pattern 2 more than other portions. Is configured to provide a first adjustment unit 5 having a reduced width.

Next, the operation will be described. In the impedance adjustment circuit having such a structure, the characteristic impedance of the first adjustment unit 5 is equal to the strip conductor pattern 2.
Is higher than the other parts, there is an effect of equivalently inserting a series inductive element. By changing the width and length of the first adjusting part 5, impedance adjustment can be performed, and The high-frequency signal applied to the conductor pattern 2 propagates efficiently along the strip conductor pattern 2 without reflection.

In FIG. 6, reference numerals 1 to 4 are the same as those in FIG. 5, and reference numeral 6 is a second adjusting unit. In a coplanar line composed of a strip conductor pattern 2 on a dielectric 1 and a ground conductor pattern 4 provided on the same plane as the strip conductor pattern 2 via a gap 3 parallel to the left and right of the strip conductor pattern 2. The second adjusting unit 6 is provided on the strip conductor pattern 2 so that the width of the strip conductor pattern is wider than other portions.

Next, the operation will be described. In the impedance adjustment circuit having such a structure, the characteristic impedance of the second adjustment unit 6 is the same as that of the strip conductor pattern 2.
Is lower than the other parts, there is an effect of equivalently inserting a parallel capacitive element. By changing the width and length of the second adjusting unit 6, impedance adjustment can be performed, The high-frequency signal applied to the conductor pattern 2 propagates efficiently along the strip conductor pattern 2 without reflection.

[0006]

Since the conventional impedance adjustment circuit is configured as described above, the first adjustment unit 5 and the second adjustment unit 6 shown in FIGS. Since it is formed in advance by etching or the like, it can be applied only to impedance adjustment predicted in design, and cannot adjust mismatch caused by connecting an external device or the like. In order to adjust the impedance of the mismatch due to connection of an external device or the like, it is necessary to perform an operation of reducing the width of the strip conductor pattern or an operation of increasing the width of the strip conductor pattern.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides an impedance adjustment circuit for a coplanar line that facilitates the adjustment work without processing a strip conductor pattern at the time of impedance adjustment. The purpose is to:

[0008]

According to a first aspect of the present invention, there is provided an impedance adjusting circuit in which a notch is formed in a ground conductor pattern in a coplanar line, and a plurality of ribbon-shaped conductors are connected on the notch to form an arbitrary ribbon. The impedance is adjusted by cutting the conductor.

Further, in the impedance adjusting circuit according to the second invention, in the coplanar line, a plurality of island-shaped conductor patterns surrounded by air gaps are provided in the ground conductor pattern, and the strip conductor pattern is changed to an arbitrary island-shaped conductor pattern. It is configured to adjust the impedance by connecting.

The impedance adjusting circuit according to a third aspect of the present invention is a coplanar line in which a strip conductor pattern is provided with a dielectric disposed above.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 The configuration of the impedance adjustment circuit according to the first embodiment of the present invention is shown in FIG.
In the figure, reference numerals 1 to 4 are the same as those in the conventional example, 7 is a cutout, 8a, 8b and 8c are gold ribbons.
The strip conductor pattern 2 and a ground conductor pattern 4 provided on the same plane as the strip conductor pattern 2 via a gap 3 parallel to the left and right of the strip conductor pattern 2.
In the coplanar line composed of the following, a notch 7 is provided in a part of the ground conductor pattern 4, and the notch 7 is connected by gold ribbons 8a, 8b and 8c.

FIG. 2 is a top view of the first embodiment of the present invention. In the figure, the gold ribbon 8a is connected so that its end is on the same line as the ground conductor 4. The gold ribbon 8b and the gold ribbon 8c are sequentially connected at a position where the gold ribbon 8b and the gold ribbon 8c enter into the back from the end.

Next, the operation will be described. The high-frequency signal applied to the strip conductor pattern 2 propagates along the strip conductor pattern 2, and when impedance adjustment is not required, the ground current flowing through the ground conductor 4 flows through the gold ribbon 8 a in the notch 7. Therefore, the operation is performed so that the ground conductor 4 is present continuously equivalently. On the other hand, when a mismatch occurs for some reason and impedance adjustment is necessary, the gold ribbon 8a, the gold ribbon 8b, and the gold ribbon 8c are sequentially cut in accordance with the adjustment amount, thereby cutting the ground flowing through the ground conductor 4. A phase difference occurs between the current and the high-frequency signal flowing through the strip conductor, and the characteristic impedance of the strip conductor pattern 2 can be changed at the location of the notch 7 of the strip conductor pattern 2 with respect to other portions, thereby adjusting the impedance. Can be.

Embodiment 2 FIG. The configuration of the impedance adjustment circuit according to the second embodiment of the present invention has the configuration shown in FIG. 3, in which 1 to 4 are the same as those in the conventional example, 9 is a gap, and 10 is an island-shaped conductor. Pattern, 1
1 is a gold ribbon. In the same manner as in the prior art, a strip conductor pattern 2 is formed on a dielectric 1 and a ground conductor pattern 4 provided on the same plane as the strip conductor pattern 2 via a gap 3 parallel to the left and right of the strip conductor pattern 2. In the configured coplanar line, an island-shaped conductor pattern 10 surrounded by a gap 9 is arranged in a ground conductor pattern 4, and when impedance adjustment is necessary,
The strip conductor pattern 2 and the island-shaped conductor pattern 10 are connected by a gold ribbon 11.

Next, the operation will be described. If impedance adjustment is not required, use strip conductor pattern 2
The high-frequency signal applied to the antenna propagates along the strip conductor pattern 2 and when impedance adjustment is required,
The connection between the strip conductor pattern 2 and the island-shaped conductor pattern 10 by the gold ribbon 11 has the effect of equivalently inserting a parallel capacitive element, and the reflection characteristics can be improved. Also, by appropriately selecting the position of the island-shaped conductor pattern 10 for connecting the gold ribbon 11,
1 can be adjusted in length and position, and an arbitrary parallel capacitive element can be inserted in a suitable place.

Embodiment 3 The configuration of the impedance adjustment circuit according to the third embodiment of the present invention has the configuration shown in FIG. 4. In FIG. 4, reference numerals 1 to 4 are the same as those in the conventional example, and reference numeral 12 is a dielectric. As in the prior art, the strip conductor pattern 2 provided on the dielectric 1
In the coplanar line composed of the gap 3 and the ground conductor pattern 4, the dielectric 12 is arranged above the strip conductor pattern 2 when impedance adjustment is necessary.

Next, the operation will be described. If impedance adjustment is not required, use strip conductor pattern 2
The high-frequency signal applied to is propagated along the strip conductor pattern 2, and when impedance adjustment is required,
By arranging the dielectric 12 above the strip conductor pattern 2, the effect of equivalently inserting a parallel capacitive element can be obtained, and the reflection characteristics can be improved. Furthermore, dielectric 1
By adjusting the position 2, size, and dielectric constant of the element 2, an arbitrary parallel capacitive element can be inserted in a suitable place.

[0018]

According to a first aspect of the present invention, the strip conductor pattern is cut by cutting the ribbon conductor at the time of impedance adjustment by connecting the ribbon conductor to an upper portion of the notch provided in the ground conductor pattern in advance. The effect is that the impedance can be easily adjusted without changing the line width.

According to a second aspect of the present invention, the impedance is adjusted without changing the line width of the strip conductor pattern by connecting the island-like conductor pattern and the strip conductor pattern provided on the ground conductor pattern at the time of impedance adjustment by the ribbon conductor. Can be adjusted.

According to a third aspect of the present invention, the impedance is adjusted without changing the line width of the strip conductor pattern by arranging a dielectric on the strip conductor pattern at the time of impedance adjustment, and without connecting the ribbon-shaped conductor. This has the effect that it can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an impedance adjustment circuit according to Embodiment 1 of the present invention.

FIG. 2 is a top view of the configuration of the impedance adjustment circuit according to the first embodiment of the present invention;

FIG. 3 is a diagram showing a configuration of an impedance adjustment circuit according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of an impedance adjustment circuit according to Embodiment 3 of the present invention.

FIG. 5 is a diagram illustrating a configuration example of a conventional impedance adjustment circuit.

FIG. 6 is a diagram illustrating a configuration example of a conventional impedance adjustment circuit.

[Explanation of symbols]

1 dielectric, 2 strip conductor pattern, 3 voids,
4 ground conductor pattern, 5 first adjustment section, 6 second adjustment section, 7 gap, 8 gold ribbon, 9 gap, 10 island-shaped conductor pattern, 11 gold ribbon, 12 dielectric.

Claims (3)

[Claims] A strip conductor pattern provided on a dielectric, and a strip conductor pattern on the same surface as the strip conductor pattern.
In a coplanar line having a ground conductor pattern provided on the left and right sides of the strip conductor pattern via a gap parallel to the strip conductor pattern, a notch is formed in the ground conductor pattern, and a plurality of ribbons are formed on the notch. An impedance adjustment circuit which is connected by a conductor and cuts an arbitrary one of the plurality of ribbon-shaped conductors. 2. A strip conductor pattern provided on a dielectric, and on the same surface as the strip conductor pattern,
In a coplanar line having a ground conductor pattern provided via a gap parallel to the strip conductor pattern on the left and right of the strip conductor pattern, an island-like conductor pattern surrounded by a gap is formed in the ground conductor pattern, An impedance adjustment circuit, wherein the strip conductor pattern is connected to an arbitrary island-shaped conductor pattern. 3. A strip conductor pattern provided on a dielectric, and on the same surface as the strip conductor pattern,
In a coplanar line having a ground conductor pattern provided on the left and right sides of the strip conductor pattern via a gap parallel to the strip conductor pattern, a dielectric is disposed on the strip conductor pattern. .