JPH0446404A - Delay line - Google Patents

Abstract

PURPOSE:To eliminate the need for a ground conductor between both strip conductors and to make the thickness thin by forming two strip conductors between two ground conductors and devising the approached parts to be crossed almost at a right angle to each other so as to reduce the electromagnetic coupling between both the strip lines entirely. CONSTITUTION:Both ends 7a, 7b, 8a, 8b of ground conductors 7, 8 inserted between conductors 6, 9 are formed to reach a side face of a laminator 10, one end 7a of the conductor 7 is connected to an input external electrode 11, one end 8a of the conductor 8 is connected to an output outer electrode 12 and the other ends 7b, 8b are connected via a relay (connection use) outer electrode 13. Thus, the conductors 7, 8 are connected in series between the electrodes 11, 12 electrically. The conductors 7, 8 are formed in a meandering way, and parts of both the conductors 7, 8 close to each other in plane view are formed to be crossed almost at a right angle to each other. Thus, the electromagnetic coupling hardly takes place between the conductors 7, 8 over the entire length to eliminate the need for a ground conductor between the conductors 7, 8, resulting in thin profile.

Description

Detailed Description of the Invention The present invention relates to a delay line used for delaying signal transmission in computers, measuring instruments, etc.

As shown in FIG. 4, as the above-mentioned delay line, a ground conductor 22 is formed over almost the entire lower surface of a substrate 21 made of a low dielectric constant material such as an alumina substrate, and a ground conductor 22 is formed on the upper surface. A structure in which a strip conductor 23 is formed in a straight line and uses a so-called microstrip is known.

By the way, depending on the length of the delay time, if the strip conductor 23 is made straight as described above, the time will be shorter.
As shown in the figure, there is a device in which the strip conductor 23 is formed in a meandering state, but if even this is not enough time, a delay line in which the strip conductor 23 is formed in a straight or meandering state is laminated, and the strip conductor 23 is formed in a meandering state. It is common practice to connect them in series.

However, in the latter case, there is a problem in that the entire structure becomes thick. To specifically explain the case of a meandering strip conductor as an example, - Since both strip conductors are stacked so as to overlap when viewed from above in a boat fishing, as shown in FIG. 6, both strip conductors 32a, 32
It is not enough to provide the ground conductors 31a, 31c on one side of the strip conductor 31c on the outside, which in this case also serves as a shield. , 32b, and the ground conductor 31b is also required, resulting in a thick wall. Note that the same applies to the case of a straight strip conductor.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a day 1 noise line that can be made thinner in a type in which two strip conductors are laminated.

In the present invention, ground conductors are formed on both sides of a laminate formed by laminating a plurality of dielectric layers, and a ground conductor is formed inside the laminate from both ground conductors. Strip conductors are provided on two planes that are separated from each other and have different distances from one ground conductor, and the strip conductors are formed so that the portions where they approach each other are substantially orthogonal.J: Both are in series. Characterized by being connected to the state.

In the present invention, two strip conductors are formed inside a dielectric layer sandwiched on both sides by ground conductors, and the portions where these strip conductors approach each other are approximately Since they are formed in a perpendicular state, electromagnetic coupling L7 is difficult to occur between both strip conductors, and as a result, there is no need for a ground conductor between both strip conductors.

Embodiment - 8 DEG -1--Example FIG. 1 is an exploded perspective view showing a delay line according to the present invention, and FIG. 2 is a perspective view showing the integrated state.

This delay line consists of an input external electrode 11, an output external electrode, 12. It has a configuration in which a relay (connection) external electrode 13 and a grounding external electrode 14 are formed, and is ladle-produced by firing.

Specifically, a green sheet 1 that becomes the dielectric layer by firing is the top layer, and below that, in the following order, a green sheet 2 with a ground conductor 6 formed on its top surface and a strip conductor 7 formed on its top surface. a green sheet 3 having a strip conductor 8 formed on its upper surface;
A green sheet 5 having a ground conductor 9 formed on its upper surface,
The external electrodes 11 to 14 are formed by printing or the like on four side surfaces of the stacked laminate 10 and the top and bottom surfaces attached thereto, and are produced by simultaneous firing. By this firing, the green sheets 1 to 5 are integrated. Note that the external electrodes 11 and 14 may be formed after firing.

The ground conductor 6.9, the strip conductor 7.8, and each electrode 11-14 are made of a conductive material such as Cu, for example. Also, green sheets 1 to 5
It is preferable to use a bare key with a low g-electricity. In particular, when co-firing with electrodes such as 8-slip conductors and electrodes, use materials that can be sintered at low temperatures, such as composite materials that combine glass and filler (such as Almirror 12 silica), glass ceramics, etc. It is recommended to use

The two ground conductors 6.9 are connected to connection pieces 6a and 9, respectively.
a reaches the side surface of the laminate 10, these connecting pieces 6a, 9a are in contact with the grounding external electrode 14, and the grounding conductor 6.9 functions as a ground.

The strip conductors 7 and 8 sandwiched between the ground conductors 6 and 9 are formed with both ends 7a, 7b, 8a, and 8b reaching the side surfaces of the laminate 10, and one end 7a of the strip conductor 7 is connected to the input terminal. One end 8a of the strip conductor 8 is connected to the output external electrode 11, and the other end 7b8b of the strip conductor 7.8 is connected to the output external electrode 11 via the respective electrodes 13 (for relay connection). Therefore, the strip-knob conductor 7.8 connects the input external electrode 11 and the output external electrode 1.
2 are electrically connected in series.

Both S/F lip conductors electrically connected in this way 7.
8 are both formed in a meandering state, as shown in FIG.
Both strip conductors 7 (solid line) and 8 (dashed line) in plan view
The parts that are close to each other are perpendicular to each other.

Therefore, electromagnetic coupling is difficult to occur between the two strip conductors 7 and 8 over the entire length.

Therefore, in the case of the delay line of the present invention, the ground conductor between the two strip conductors, which was conventionally necessary, can be omitted, and the delay line can be made thinner.

Although not explicitly stated in the above embodiments, each strip conductor 7.8 is designed to ensure a desired delay time with respect to the number of curved portions to create a meandering state and the length of the straight portion between them. It is also possible to use any number or length required for this purpose.

In addition, the strip conductor is not limited to one that has a meandering shape as a whole, but can also be a combination of straight and meandering parts, a gentle straight line, or a straight line. can. In short, any shape may be used as long as the portions where the two strip conductors approach can be made substantially perpendicular to each other.

Furthermore, the connection between the strip conductors 7 and 8 is not limited to the one made by the external electrode 13 on the outer surface of the laminate 10, but also the connection between the strip conductors 7 and 8.
It is also possible to form a pier hole inside O and use this. Similarly, the connection between the ground conductors 6.9 is not limited to the connection via the connection pieces 6a, 9a and the external electrode 14, but a pier hole is formed inside the laminate, and both ground conductors are connected through the pier hole. The conductors 6 and 9 may also be connected.

As described in detail above, in the case of the present invention, two strip conductors are formed between two ground conductors, and the parts approaching each other are almost perpendicular, so that
The electromagnetic coupling between both strip conductors can be made extremely small, and the ground conductor between both strip conductors, which was necessary in the past, can be made unnecessary, so that the product can be made thinner than conventional products.

[Brief explanation of the drawing]

FIG. 1 is an exploded view showing the delay line according to the present invention, FIG. 2 is an external perspective view showing the integrated state, and FIG. 3 is a plan view showing the two strip conductors 7 and 8 shown in FIG. 1. 4 and 5 are perspective views showing conventional delay lines, and FIG. 6 is a sectional view showing a laminated type conventional delay line. 1-5...Dielectric layer, 6...Strip conductor. 9...Grounding conductor, 7.8 Patent applicant: Murata Manufacturing Co., Ltd. Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) Ground conductors are formed on both sides of a laminate formed by laminating a plurality of dielectric layers, and are spaced from both ground conductors inside the laminate, and are spaced apart from one of the ground conductors at different distances. 1. A delay line characterized in that strip conductors are provided on two planes, and the strip conductors are formed with mutually approaching portions being substantially perpendicular to each other and are connected in series.