JPH01265509A - Laminated through-type capacitor - Google Patents

Abstract

PURPOSE:To improve the insertion loss characteristics in a high-frequency region by a method wherein one or more slits are provided at least on the part of an earthling electrode opposing to each through electrode in such a manner that they intersect with the through electrodes. CONSTITUTION:A slit 20 is inserted into the center part of earthing electrodes 28 in the direction crossing with a through electrode 16, and the electrodes 28 are divided into two parts. Two capacitors C1 and C2 are formed respectively between the electrodes 16 and 28. When the inductance, to be formed on the electrodes 28 in a high frequency region, is concentrated for every phase, the capacitors are brought into the form wherein the two inductances L1 and L2 are series-inserted respectively between the electrodes 28, with which capacitors C1 and C2 are formed, and earthing external electrodes 8. As a result, the insertion loss characteristics in the region of high frequency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a feedthrough capacitor used, for example, in a noise filter, and particularly to means for improving its insertion loss characteristics in a high frequency range.

[Conventional technology]

FIG. 6 is a perspective view showing an example of a multilayer feedthrough capacitor.

This multilayer feedthrough capacitor uses a dielectric material such as ceramics,
Inside, three through electrodes passing through the through electrodes and a ground electrode opposing the three through electrodes are alternately stacked with a dielectric interposed therebetween, and external electrodes 6a to 6C are placed at both ends of each through electrode, and external electrodes 6a to 6C are placed at both ends of the ground electrode. An external electrode 8 is connected to each.

Conventionally, such a multilayer feedthrough capacitor has three through electrodes 16 provided (for example, printed) on a dielectric sheet 14 before firing, such as a ceramic green sheet, as shown in FIG. A plurality of dielectric sheets 14 provided with a wide ground electrode 18 are laminated alternately on top of the dielectric sheet 14, and if necessary, dielectric sheets 14 without electrodes provided on both the upper and lower sides are stacked, and the whole is crimped and fired. However, the external electrodes 6a to 6c and 8 as described above are further provided.

FIG. 8 is an equivalent circuit diagram thereof, in which a capacitor C is formed between each through electrode 16 and the ground electrode 18.

[Problem to be solved by the invention]

However, in the multilayer feedthrough capacitor as described above, the higher the frequency range, the more the inductance generated on the ground electrode 18 cannot be ignored, and when expressed collectively for each phase, each capacitor C An inductance L is inserted in series between the grounding electrode 18 and the grounding external electrode 8, respectively.

Therefore, especially in the center capacitor C, the distance to the external electrode 8 is longer, so the inductance L on the ground side is larger than that of other capacitors. This makes it easier for the high frequency signal to return to the through electrode 16 again.

As a result, there was a problem in that the insertion loss characteristics of the central phase and, ultimately, of the entire multilayer feedthrough capacitor in the high frequency range deteriorated.

Therefore, an object of the present invention is to provide a multilayer feedthrough capacitor with improved insertion loss characteristics in a high frequency range.

[Means for Solving the Problems] The multilayer feedthrough capacitor of the present invention has one or more slits formed in at least the portion of the ground electrode facing each through electrode so as to intersect with the through electrodes. Features.

[Effect]

By providing a slit in the ground electrode as described above, insertion loss characteristics in a high frequency range are improved.

This is thought to be because the slits divide at least the portion of the earth electrode that faces each through electrode, making it difficult for high-frequency signals that were once bypassed to the earth electrode to return to the through electrodes again. .

〔Example〕

FIG. 1 is an exploded perspective view showing the internal structure of a multilayer feedthrough capacitor according to an embodiment of the present invention.

The appearance of this multilayer feedthrough capacitor is the same as that shown in FIG. 6, so its illustration is omitted. Further, parts equivalent to those in the example of FIG. 7 are given the same reference numerals, and the differences from the conventional example will be mainly explained below.

In the multilayer feedthrough capacitor of this embodiment, one slit 20 is provided in the center of each ground electrode 28 corresponding to the ground electrode 18 as described above in the direction intersecting the through electrode 16. Each day is divided into two.

Figure 2 is an equivalent circuit diagram of this multilayer feedthrough capacitor.
Two capacitors C1 and C2 are formed between each through electrode 16 and the ground electrode 28, and if the inductance formed on the ground electrode 28 in the high frequency range is aggregated for each phase, each capacitor C, C2 is Two inductances L, , and L are inserted in series between the ground electrode 28 to be formed and the external earth electrode 8, respectively.

As a result, in such a multilayer feedthrough capacitor, the insertion loss characteristics of each phase in the high frequency range are improved. this is,
By dividing the earth electrode 28 into two, the earth electrode 2
This is thought to be because high frequency signals such as noise bypassed by the through electrode 8 are difficult to return to the through electrode 16 again.This characteristic improvement effect is particularly remarkable in the center phase, where conventional characteristics were worse than others.

In addition, the number of divisions of the ground electrode 28 may be three or more by using a plurality of slits 20.

Furthermore, the entire length of the ground electrode 28 does not necessarily have to be divided; for example, as shown in FIG. 3, a slit 20 may be provided at least in the portion facing each through electrode 16 as shown in FIG. .

Furthermore, as shown in FIG. 4, for example, the center portion of each through electrode 16 may be made thinner, and in this case, as shown in FIG. The inductance L3 is inserted in series with the inductance L3, making it possible to further improve insertion and loss characteristics in the high frequency range.

In addition, although an example in which there are three through electrodes 16 has been described above, it goes without saying that the number of through electrodes 16 may be one or more.

〔Effect of the invention〕

As described above, according to the present invention, insertion loss characteristics in a high frequency range can be improved by providing a slit in the ground electrode.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the internal structure of a multilayer feedthrough capacitor according to an embodiment of the present invention. FIG. 2 is an equivalent circuit diagram of the multilayer feedthrough capacitor shown in FIG. 1. FIG. 3 is a perspective view showing another example of the earth electrode. FIG. 4 is a perspective view showing another example of the through electrode. FIG. 5 is a partial equivalent circuit diagram of a multilayer feedthrough capacitor using the through electrode shown in FIG. FIG. 6 is a perspective view showing an example of a multilayer feedthrough capacitor. FIG. 7 is an exploded perspective view showing the internal structure of a conventional multilayer feedthrough capacitor. FIG. 8 is an equivalent circuit diagram of the multilayer feedthrough capacitor shown in FIG. 7. 14... Dielectric sheet, I6... Through electrode, 20...
...Slit, 28...Earth electrode.

Claims (1)

[Claims] (1) In a multilayer feedthrough capacitor in which one or more through electrodes penetrating through a dielectric material and a ground electrode facing the dielectric material are alternately laminated with the dielectric interposed therebetween, one or more through electrodes penetrating through the dielectric material are stacked alternately with one or more through electrodes penetrating through the dielectric material, and a ground electrode facing at least one of the through electrodes of the ground electrode is stacked alternately. A multilayer feedthrough capacitor characterized in that one or more slits are formed in the portion where the feedthrough electrode intersects with the feedthrough electrode.