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Monolithic capacitor and mounting structure thereof

a monolithic capacitor and mounting structure technology, applied in the direction of fixed capacitors, stacked capacitors, fixed capacitor details, etc., can solve the problems of high-frequency characteristics degradation and steep impedance characteristics, and achieve the effect of low esl

Inactive Publication Date: 2007-12-06
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a monolithic capacitor with a decreased ESL and increased ESR, and a mounting structure for the monolithic capacitor that allows for the low ESL characteristics to be exhibited. The monolithic capacitor includes a main capacitor unit with a lamination of multiple dielectric layers. The main capacitor unit has first and second capacitor portions with a predetermined number of internal electrodes and dielectric layers. The mounting structure includes a mounting surface and the monolithic capacitor is mounted with the main capacitor unit arranged so that the first capacitor portion is closer to the mounting surface. This allows for a higher resonant frequency in the first capacitor portion, which affects frequency characteristics in a higher frequency range. The invention provides a solution for improving the performance of monolithic capacitors in high-frequency applications.

Problems solved by technology

Therefore, the problem of steep impedance characteristics arises.
This causes the problem of degradation of high-frequency characteristics.

Method used

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  • Monolithic capacitor and mounting structure thereof
  • Monolithic capacitor and mounting structure thereof
  • Monolithic capacitor and mounting structure thereof

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Embodiment Construction

[0066] FIGS. 1 to 4B show a monolithic capacitor according to a first preferred embodiment of the present invention. FIG. 1 is a perspective view showing the appearance of the monolithic capacitor 1, and FIG. 2 is a sectional view showing a mounting structure of the monolithic capacitor 1. In FIG. 2, the monolithic capacitor 1 is shown in cross-section taken along lines II-II in FIGS. 3A, 3B, 4A and 4B described later.

[0067] The monolithic capacitor 1 preferably includes a substantially rectangular main capacitor unit 8 having two opposing principal surfaces 2 and 3 and four side surfaces 4, 5, 6, and 7 connecting the principal surfaces 2 and 3. The main capacitor unit 8 has a monolithic structure including a lamination of a plurality of dielectric layers 9 parallel to the principal surfaces 2 and 3, and composed of, for example, a dielectric ceramic material.

[0068] As shown in FIG. 2, the main capacitor unit 8 includes first capacitor portions 11 and a second capacitor portion 12...

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Abstract

A monolithic capacitor includes a main capacitor unit having first capacitor portions and a second capacitor portion arranged in a direction of lamination, with the first capacitor portion located towards at least one end in the direction of lamination, so that the first capacitor portion is located closer to a mounting surface than the second capacitor portion. The number of pairs of third and fourth lead-out portions for third and fourth internal electrodes in the second capacitor portion is less than the number of pairs of first and second lead-out portions for first and second internal electrodes in the first capacitor portion, so that the first capacitor portion contributes to decreasing ESL while the second capacitor portion contributes to increasing ESR.

Description

[0001] This application is a Divisional Application of U.S. patent application Ser. No. 11 / 616,550 filed Dec. 27, 2006, currently pending.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to monolithic capacitors and mounting structures of the monolithic capacitors. More specifically, the present invention relates to a monolithic capacitor that is used in a high-frequency circuit and to a mounting structure of the monolithic capacitor. [0004] 2. Description of the Related Art [0005] As a decoupling capacitor that is used in a power supply circuit for an MPU (Micro Processing Unit) in a high frequency range on the order of several GHz, for example, a monolithic capacitor having a structure described in Japanese Unexamined Patent Application Publication No. 11-144996 (Patent Document 1) is known. In the monolithic capacitor, a plurality of terminals is provided such that adjacent terminals have opposite polarities. Thus, the length of pa...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01G4/228
CPCH01G4/385H01G4/30H01G4/12H01G4/38
Inventor TAKASHIMA, HIROKAZUUEOKA, HIROSHITAKAGI, YOSHIKAZU
Owner MURATA MFG CO LTD
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