JPS62194702A - Strip line - Google Patents

Abstract

PURPOSE:To decrease the variance of the characteristic of a strip line by putting in a conductive adhesives in a recess of opposed line electrodes to bond the line electrodes whose recessed parts are opposed to each other. CONSTITUTION:A recess 18 is provided to at least a line electrode 16b in line electrodes 16a, 16b opposed to each other. A conductive adhesives 8 is put in the recess 18 and the electrodes 16a, 16b are bonded electrically at the recess 18. Then even if the quantity of the adhesives 8 or the position of the adhesives is varied more or less, the protrusion of the adhesives 8 after the bonding of the electrodes 16a, 16b hardly takes place. Thus, the variance in the characteristic of the strip line is reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to the so-called triplate type, which is used, for example, in microwave transmission lines, filters, or MIGs (microwave integrated circuits) using them. Regarding strip lines.

[Conventional technology]

FIG. 5 is a sectional view partially showing an example of a conventional strip line. This strip line is called triple play!・It is a type with ground electrodes 4a, 4 on one main surface.
b has one or more line electrodes i6a, 6 on the other main surface.
Two dielectric substrates 2a and 2b each having a dielectric substrate 2a and 2b formed thereon are stacked so that the respective line electrodes 6a and 6b face each other and are electrically conductive.

Specifically, the dielectric substrates 2a and 2b are bonded together using an inorganic adhesive 1o such as glass glaze, and the line electrodes 6a and 6b are bonded together using a conductive bonding agent 8, such as silver paste. Conductive bonding (bonding in a conductive state) is done by baking or soldering using solder cream or the like.

[Problem that the invention seeks to solve]

However, in the above-mentioned strip line, unless the amount and position of the conductive bonding agent 8 applied are very strictly controlled, the conductivity will be lost after the upper and lower dielectric substrates 2a, 2b and line electrodes 6a, 6b are bonded together. The bonding agent 8 may protrude from the line electrodes 6a and 6b, changing the electrode area, or there may be areas where the conductive bonding agent 8 is not attached, and the condition may vary among individual strip lines.
The characteristics of the stripline tend to vary (therefore, there were problems in mass production, such as a decrease in the quality of products when mass produced).

Furthermore, since the conductive bonding agent 8 is sandwiched between the line electrodes 6a and 6b, the gap A between the rereading body substrates 2a and 2b is large, and it tends to vary, so the characteristics tend to vary from this point as well. was.

Therefore, an object of the present invention is to provide a stripline with stable characteristics and high productivity.

[Means for solving problems]

The strip line of the present invention has two dielectric substrates each having a ground electrode formed on one main surface and a line electrode formed on the other main surface, which are stacked so that the line electrodes face each other and are electrically conductive. In the strip line, a recess is provided in at least one line electrode part of the opposing line electrodes, a conductive bonding agent is placed in the recess, and the opposing line electrodes are conductively bonded to each other in the recessed part. It is characterized by

[Effect]

Conductive bonding between line electrodes facing each other is performed in the recessed area, and the recess has a so-called escape space for the conductive bonding agent when bonding the electrodes, so the amount and position of the conductive bonding agent may vary. Even if there is some variation, there is almost no protrusion of the conductive bonding agent after electrode bonding, and as a result, variations in the characteristics of the strip line can be suppressed to a small level.

〔Example〕

FIGS. 1 and 2 are cross-sectional views partially showing a strip and a lip line according to an embodiment of the present invention, respectively.

Components equivalent to those in FIG. 5 are designated by the same reference numerals and their explanations will be omitted.

In the embodiment of FIG. 1, opposing line electrodes 16
A recess 18 is provided in one of the electrodes a and 16b, which is the line electrode 16b in this example. In the embodiment shown in FIG. 2, a similar recess 18 is also provided on the line electrode 16a side.

The shape of the recess 18 is not limited to a specific shape, and various shapes can be adopted. For example, line electrode 16
Taking side b as an example, as shown in FIG.
The line electrode 16b may be formed in the form of a long and narrow groove running in the longitudinal direction of the line electrode 16b, or as shown in FIG. . The same applies to the line electrode 16a side.

When bonding both dielectric substrates 2a and 2b together, a conductive bonding agent 8 such as silver paste or solder cream is placed in the recess 18 to electrically bond the line electrodes 16a and 16b to each other only in the recess 18. I try to do that.

Therefore, in the above-mentioned strip line, there is a so-called escape space in the recess 18 when the conductive adhesive 8, for example, silver paste, is baked or solder cream is melted. Even if there is some variation in the amount and position of application, the protrusion of the conductive bonding agent 8 from the electrode after electrode bonding and the occurrence of portions where the conductive bonding agent 8 is not attached, as in the conventional case, are almost eliminated. As a result, variations in the characteristics of the stripline are suppressed to a small extent, and the yield rate in mass production is improved. In other words, mass productivity is improved.

In addition, since the conductive bonding agent 8 is not sandwiched between the line electrodes 16a and 16b as in the conventional case, the rereading body substrates 2a and 2
When the gap B between the line electrodes 16a and 1 becomes smaller, the size of the gap B after bonding becomes smaller.
Since the thickness is almost defined by the thickness of 6b, there is little variation, and from this point as well, a strip line with stable characteristics can be obtained.

Incidentally, when the recess 1B is as shown in FIG. 4, the joints between the inner electrodes 15a and 16b are partially scattered, but their positions do not vary as in the conventional case. In this case as well, a strip line with stable characteristics can be obtained as in the case of FIG.

〔Effect of the invention〕

As described above, according to the present invention, a strip line with stable characteristics and high productivity can be obtained.

Furthermore, as a result, it is also possible to reduce the cost of the strip line.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are respectively sectional views partially showing a stripline according to an embodiment of the present invention. FIGS. 3 and 4 are perspective views partially showing examples of one dielectric substrate, respectively. FIG. 5 is a sectional view partially showing an example of a conventional strip line.

Claims (1)

[Claims] (1) In a strip line formed by stacking two dielectric substrates each having a ground electrode on one main surface and a line electrode on the other main surface so that the line electrodes face each other and are electrically conductive. , a recess is provided in at least one line electrode part of the opposing line electrodes, a conductive bonding agent is placed in the recess, and the opposing line electrodes are conductively bonded to each other in the recessed part. Features a strip line.