JP2000124068A - Laminated-type noise filter - Google Patents

Laminated-type noise filter

Info

Publication number
JP2000124068A
JP2000124068A JP10294947A JP29494798A JP2000124068A JP 2000124068 A JP2000124068 A JP 2000124068A JP 10294947 A JP10294947 A JP 10294947A JP 29494798 A JP29494798 A JP 29494798A JP 2000124068 A JP2000124068 A JP 2000124068A
Authority
JP
Japan
Prior art keywords
electrode layer
layer
electrode
inductor
noise filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10294947A
Other languages
Japanese (ja)
Inventor
Hidekazu Koga
英一 古賀
Hideaki Tokunaga
英晃 徳永
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP10294947A priority Critical patent/JP2000124068A/en
Publication of JP2000124068A publication Critical patent/JP2000124068A/en
Pending legal-status Critical Current

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  • Ceramic Capacitors (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Filters And Equalizers (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a laminated-type noise filter, which is compact and is superior in filtering characteristic at a high-frequency band. SOLUTION: This noise filter is constituted by ground electrode layers 7a, 7b and 7c, each constituted of a ground internal electrode 11 which has first extensions 12 and 13 on the inside of a ceramics layers 10 or 21 to arranged directions of outside grounding electrodes, respectively, and which is connected to the external grounding electrodes, a capacitor electrode layer 8 constituted of a pair of capacitor internal electrodes 14 and 15, having extensions 16 and 17 from oppositely facing edge parts in the directions of external electrodes respectively, to the central part on a ceramics layer 10, and an inductor electrode layer 9 constituted by an inductor internal electrode 22, which is connected to outside electrodes arranged opposite on a ceramics layer 10.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は高周波ノイズから電
子機器等を保護するための小型の積層型ノイズフィルタ
に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-sized laminated noise filter for protecting electronic equipment from high-frequency noise.

【0002】[0002]

【従来の技術】近年、パソコン等の情報機器、デジタル
機器等の回路部の高周波数化に伴い、これらから発生す
る高周波ノイズの防止が重要となり、また、ノートパソ
コンやデジタルカメラなどに代表されるように各種電子
機器は小型化が進み使用される電子部品にも小型化への
要求が強い。したがって、これらの電子機器に使用され
るノイズフィルタとしては一般にコンデンサ2個とイン
ダクタ1個により構成したπ型フィルタ及びコンデンサ
1個とインダクタ2個により構成したT型フィルタが使
用され、これらは特開平5−235680号公報に開示
されている。前記特開平5−235680号公報による
とπ型のフィルタのコンデンサ成分を分割し、前記分割
されたコンデンサのグランド側容量電極が複数の外部グ
ランド電極に接続して成り、外部グランド電極側に発生
する残留インダクタンスのインピーダンスを相対的に小
さくし高周波ノイズがグランドに流れ易くしたものであ
る。
2. Description of the Related Art In recent years, with the increase in the frequency of information devices such as personal computers and digital devices and the like, it has become important to prevent high-frequency noise generated from them, and is typified by notebook computers and digital cameras. As described above, various electronic devices have been downsized, and there is a strong demand for downsized electronic components. Therefore, as a noise filter used in these electronic devices, a π-type filter composed of two capacitors and one inductor and a T-type filter composed of one capacitor and two inductors are generally used. It is disclosed in JP-A-5-235680. According to JP-A-5-235680, a capacitor component of a π-type filter is divided, and a ground-side capacitance electrode of the divided capacitor is connected to a plurality of external ground electrodes, which is generated on the external ground electrode side. The impedance of the residual inductance is made relatively small, so that high-frequency noise easily flows to the ground.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、前記特
開平5−235680号公報に類する構成によれば、小
形サイズにおいては積層して成るコンデンサ成分とイン
ダクタ成分が電界結合し易く、コンデンサ成分とインダ
クタ成分が相互に干渉し合うためフィルタ特性を悪化さ
せ、小型化の中で目標特性を得ることが困難であった。
However, according to the configuration similar to the above-mentioned Japanese Patent Application Laid-Open No. 5-235680, in a small size, the capacitor component and the inductor component, which are laminated, are apt to be electrically coupled, and the capacitor component and the inductor component are easily combined. However, they interfere with each other, so that the filter characteristics are deteriorated, and it is difficult to obtain the target characteristics in the miniaturization.

【0004】そこで、本発明は小型で高周波帯域におけ
るフィルタ特性に優れた積層型ノイズフィルタを提供す
ることを目的とする。
Accordingly, an object of the present invention is to provide a laminated noise filter which is small and has excellent filter characteristics in a high frequency band.

【0005】[0005]

【課題を解決するための手段】この目的を達成するため
に本発明の積層型ノイズフィルタは、セラミックス層と
内部電極層とを交互に積み重ねて積層体とし、この積層
体の相対向する側面に外部電極を形成すると共に正面及
び背面の少なくとも一面に外部接地電極を形成し、前記
積層体はセラミックス層上の内方に前記接地電極の配設
方向に向けた第1の延長部を有し前記外部接地電極と接
続した接地内部電極を形成して成る接地電極層と、セラ
ミックス層上に前記外部電極の配設方向の相対向する縁
端部からそれぞれ中央部に向けて一対の第2の延長部を
持つコンデンサ内部電極を形成して成るコンデンサ電極
層およびセラミックス層上に前記相対向する外部電極間
を接続したインダクタ内部電極を形成して成るインダク
タ電極層とより構成し、前記接地電極層を前記コンデン
サ電極層とインダクタ電極層の間および前記コンデンサ
電極層とインダクタ電極層の外面に備えたことを特徴と
し、これにより、小型で高周波帯域におけるフィルタ特
性に優れた積層型ノイズフィルタが得られる。
In order to achieve this object, a laminated noise filter according to the present invention comprises a laminated body in which ceramic layers and internal electrode layers are alternately laminated to form a laminated body. Forming an external electrode and forming an external ground electrode on at least one of a front surface and a rear surface, wherein the laminate has a first extension inward on a ceramic layer in a direction in which the ground electrode is provided; A ground electrode layer formed by forming a grounded internal electrode connected to an external grounded electrode; and a pair of second extensions extending from the opposing edges in the direction in which the external electrodes are arranged on the ceramic layer toward the center. A capacitor electrode layer formed by forming a capacitor internal electrode having a portion, and an inductor electrode layer formed by forming an inductor internal electrode connecting the opposed external electrodes on a ceramic layer. The ground electrode layer is provided between the capacitor electrode layer and the inductor electrode layer and on the outer surfaces of the capacitor electrode layer and the inductor electrode layer, whereby a small-sized laminated layer having excellent filter characteristics in a high-frequency band is provided. A type noise filter is obtained.

【0006】[0006]

【発明の実施の形態】本発明の請求項1に記載の発明
は、セラミックス層と内部電極層とを交互に積み重ねて
積層体とし、この積層体の相対向する側面に外部電極を
形成すると共に正面及び背面の少なくとも一面に外部接
地電極を形成し、前記積層体はセラミックス層上の内方
に前記接地電極の配設方向に向けた第1の延長部を有し
前記外部接地電極と接続した接地内部電極を形成して成
る接地電極層と、セラミックス層上に前記外部電極の配
設方向の相対向する縁端部からそれぞれ中央部に向けて
一対の第2の延長部を持つコンデンサ内部電極を形成し
て成るコンデンサ電極層およびセラミックス層上に前記
相対向する外部電極間を接続したインダクタ内部電極を
形成して成るインダクタ電極層とより構成し、前記接地
電極層を前記コンデンサ電極層とインダクタ電極層の間
および前記コンデンサ電極層とインダクタ電極層の外面
に備えた積層型ノイズフィルタであり、この構成によっ
てインダクタ電極層とコンデンサ電極層は接地電極層に
シールドされ相互に干渉することなく、小形かつ高周波
帯域における減衰特性に優れた積層型ノイズフィルタが
得られる。
BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is characterized in that ceramic layers and internal electrode layers are alternately stacked to form a laminate, and external electrodes are formed on opposing side surfaces of the laminate. An external ground electrode is formed on at least one of the front surface and the rear surface, and the laminate has a first extension inward on the ceramic layer in a direction in which the ground electrode is provided, and is connected to the external ground electrode. A capacitor internal electrode having a ground electrode layer formed with a ground internal electrode, and a pair of second extension portions each extending from the opposing edges in the direction of disposing the external electrodes on the ceramic layer toward the center; And an inductor electrode layer formed on the ceramics layer by forming an inductor internal electrode connecting the opposed external electrodes on the ceramic layer, and the ground electrode layer is formed of the capacitor electrode layer. A stacked noise filter provided between the capacitor electrode layer and the inductor electrode layer and on the outer surfaces of the capacitor electrode layer and the inductor electrode layer. With this configuration, the inductor electrode layer and the capacitor electrode layer are shielded by the ground electrode layer and interfere with each other. Thus, a small-sized multilayer noise filter having excellent attenuation characteristics in a high-frequency band can be obtained.

【0007】請求項2に記載の発明は、前記コンデンサ
電極層の一対の延長部はセラミックス層上で接触するこ
とがなく間隙部を構成し、前記接地電極との間に第1、
第2のコンデンサを形成すると共に前記間隙部で電界結
合し、前記インダクタ電極層のインダクタ成分との***
振によって減衰極を構成して成る請求項1に記載の積層
型ノイズフィルタであり、この構成により高周波帯域の
減衰量を更に大きくでき減衰特性に優れた積層型ノイズ
フィルタが得られる。
According to a second aspect of the present invention, the pair of extension portions of the capacitor electrode layer forms a gap without contacting on the ceramic layer, and the first and second extension portions are provided between the capacitor electrode layer and the ground electrode.
2. The multilayer noise filter according to claim 1, wherein a second capacitor is formed, and electric field coupling is performed in the gap, and an attenuation pole is formed by anti-resonance with an inductor component of the inductor electrode layer. As a result, the amount of attenuation in the high frequency band can be further increased, and a multilayer noise filter having excellent attenuation characteristics can be obtained.

【0008】請求項3に記載の発明は、前記一対のコン
デンサ電極層の第1の延長部の少なくとも一方がその延
長部の両端の間で電極幅にくびれを形成して成る請求項
1に記載の積層型ノイズフィルタであり、この構成によ
って、前記くびれ部で急激なインピーダンスの変化が生
じ容量成分が等価的に付加されるためコンデンサ電極層
の小形化が図れるとともにインダクタ電極層のインダク
タ成分との干渉が防止され、小型の積層型ノイズフィル
タが得られる。
According to a third aspect of the present invention, at least one of the first extension portions of the pair of capacitor electrode layers has a narrowed electrode width between both ends of the extension portions. With this configuration, a sudden change in impedance occurs at the constricted portion, and a capacitance component is added equivalently, so that the capacitor electrode layer can be reduced in size and the inductor component of the inductor electrode layer can be reduced. Interference is prevented, and a small stacked noise filter is obtained.

【0009】請求項4に記載の発明は、前記コンデンサ
電極層の一対の延長部は相似形に形成して成る請求項1
に記載の積層型ノイズフィルタであり、この構成によっ
て前記一対の延長部はインピーダンスが整合されるため
所望の信号を損することなくノイズに対する減衰特性の
優れた積層型ノイズフィルタが得られる。
According to a fourth aspect of the present invention, a pair of extensions of the capacitor electrode layer are formed in a similar shape.
In this configuration, the impedance of the pair of extension portions is matched with each other, so that a multilayer noise filter having excellent noise attenuation characteristics without damaging a desired signal can be obtained.

【0010】請求項5に記載の発明は、前記インダクタ
電極層のインダクタ内部電極層を両端の幅広部と中間の
幅狭部から形成し、前記幅広部はコンデンサ電極層の内
部電極層と重ならないように外側に配置して成る請求項
1に記載の積層型ノイズフィルタであり、この構成によ
ってインダクタ内部電極幅の変化した個所により特性イ
ンピーダンスが急変し直列のインダクタ成分が等価回路
的に構成され高周波帯域において大きなインダクタが得
られ、さらに前記インダクタ電極層と接地電極層との浮
遊容量の発生を低減でき、小型で減衰特性の優れた積層
型ノイズフィルタが得られる。
According to a fifth aspect of the present invention, the inductor internal electrode layer of the inductor electrode layer is formed of a wide portion at both ends and a middle narrow portion, and the wide portion does not overlap with the internal electrode layer of the capacitor electrode layer. 2. The multilayer noise filter according to claim 1, wherein the characteristic impedance is changed abruptly at the portion where the width of the internal electrode of the inductor is changed, and a series inductor component is formed in an equivalent circuit. A large inductor can be obtained in the band, and the generation of stray capacitance between the inductor electrode layer and the ground electrode layer can be reduced, so that a small-sized laminated noise filter having excellent attenuation characteristics can be obtained.

【0011】請求項6に記載の発明は、前記外部接地電
極は積層体の正面と背面の一対に形成し、接地電極層の
第1の延長部を前記一対の外部接地電極に向けて相対向
して設け、内部電極を十字形に形成し、前記一対の第1
の延長部の縁端部と前記一対の外部接地電極を接続して
成る請求項1に記載の積層型ノイズフィルタであり、こ
の構成により、積層体の相対向する側面に形成された外
部電極間を前記接地電極でシールドをする効果を有し、
前記外部電極間の不要輻射による干渉を低減でき減衰特
性の優れた積層型ノイズフィルタが得られる。
According to a sixth aspect of the present invention, the external ground electrodes are formed on a pair of front and back surfaces of the laminate, and the first extension of the ground electrode layer is opposed to the pair of external ground electrodes. The internal electrodes are formed in a cross shape, and the pair of first electrodes
2. The multilayer noise filter according to claim 1, wherein said pair of external ground electrodes are connected to an edge of an extended portion of said multilayer body. Has the effect of shielding with the ground electrode,
Interference due to unnecessary radiation between the external electrodes can be reduced, and a multilayer noise filter having excellent attenuation characteristics can be obtained.

【0012】請求項7に記載の発明は、前記インダクタ
電極層のインダクタ内部電極と上下に隣接するセラミッ
クス層を前記コンデンサ電極層のセラミックス層より低
い誘電率の誘電体材料で形成して成る請求項1に記載の
積層型ノイズフィルタであり、この構成によってコンデ
ンサとインダクタのそれぞれの機能がより一層強化され
相互の電磁界干渉を抑制でき小型で減衰特性の優れた積
層型ノイズフィルタが得られる。
According to a seventh aspect of the present invention, the ceramic layer vertically adjacent to the inductor internal electrode of the inductor electrode layer is formed of a dielectric material having a lower dielectric constant than the ceramic layer of the capacitor electrode layer. 1. The laminated noise filter according to item 1, wherein the configuration further enhances the functions of the capacitor and the inductor, suppresses mutual electromagnetic field interference, and provides a compact laminated noise filter having excellent attenuation characteristics.

【0013】請求項8に記載の発明は、前記インダクタ
電極層のセラミックス層を磁性体材料で形成して成る請
求項1に記載の積層型ノイズフィルタであり、この構成
によって小型サイズの中で大きなインダクタを構成で
き、また、電磁界干渉による特性の劣化等を抑制できる
ため小型で減衰特性の優れた積層型ノイズフィルタが得
られる。
The invention according to claim 8 is the multilayer noise filter according to claim 1, wherein the ceramic layer of the inductor electrode layer is formed of a magnetic material. Since an inductor can be configured and deterioration of characteristics due to electromagnetic field interference can be suppressed, a small-sized laminated noise filter having excellent attenuation characteristics can be obtained.

【0014】請求項9に記載の発明は、インダクタ電極
層を誘電体材料か磁性体材料のいずれか一方で形成しコ
ンデンサ電極層のセラミックス層をバリスタ材料で形成
して成る請求項1に記載の積層型ノイズフィルタであ
り、この構成によって周波数選択のフィルタ機能にサー
ジアブソーバ機能を付加し、ノイズの除去に優れた積層
型ノイズフィルタが得られる。
According to a ninth aspect of the present invention, the inductor electrode layer is formed of one of a dielectric material and a magnetic material, and the ceramic layer of the capacitor electrode layer is formed of a varistor material. This is a multilayer noise filter. With this configuration, a surge absorber function is added to the frequency selection filter function, and a multilayer noise filter excellent in noise removal can be obtained.

【0015】請求項10に記載の発明は、前記コンデン
サ電極層とインダクタ電極層との間に接地電極層を配置
し、それぞれの外形が同一に重なり合い、前記接地電極
層が前記コンデンサ電極層とインダクタ電極層間との拡
散防止層とした請求項1に記載の積層型ノイズフィルタ
であり、異種材料の相互の拡散による特性劣化を防止し
た積層型ノイズフィルタが得られる。
According to a tenth aspect of the present invention, a ground electrode layer is arranged between the capacitor electrode layer and the inductor electrode layer, and their outer shapes overlap one another, and the ground electrode layer and the inductor electrode layer overlap each other. The multilayer noise filter according to claim 1, wherein the multilayer noise filter is a diffusion prevention layer between the electrode layers, and the multilayer noise filter can prevent deterioration of characteristics due to mutual diffusion of different materials.

【0016】請求項11に記載の発明は、前記積層体の
最上段層と最下段層が、磁性体、誘電体、半導体のいず
れか一つより選ばれた同一材料層により構成し焼成して
成る請求項1に記載の積層型ノイズフィルタであり、こ
の構成によって異種材料間の収縮率や焼結差に起因する
ソリ、層間剥離等の損傷を防止でき信頼性の優れた積層
型ノイズフィルタが得られる。
[0016] In the eleventh aspect of the present invention, the uppermost layer and the lowermost layer of the laminate are formed of the same material layer selected from one of a magnetic substance, a dielectric substance, and a semiconductor, and are fired. The multilayer noise filter according to claim 1, wherein the configuration prevents damage such as warpage and delamination caused by a difference in shrinkage and sintering between different kinds of materials. can get.

【0017】請求項12に記載の発明は、前記積層体に
おいて、外部電極にはAgあるいはガラスフリットを含
有させたAgを主成分とする電極ペースト、内部電極に
はAgを主成分とする電極ペーストを用い、焼成前の積
層体に前記外部電極を形成し、前記外部電極と前記積層
体を同時焼成して成る請求項1に記載の積層型ノイズフ
ィルタであり、誘電率の高いAgを使用することによっ
て、導体損失を小さくできフィルタの挿入損失を低減で
きる。また、前記の挿入損失の少ない電極材料を使用す
ることによりインダクタ電極層の内部電極幅を一層狭く
形成することが可能となり小型化が図れる。
According to a twelfth aspect of the present invention, in the laminate, an electrode paste mainly composed of Ag containing Ag or glass frit is used for the external electrode, and an electrode paste mainly composed of Ag is used for the internal electrode. The multilayer noise filter according to claim 1, wherein the external electrode is formed on the laminate before firing, and the external electrode and the laminate are fired simultaneously, and Ag having a high dielectric constant is used. Thereby, the conductor loss can be reduced and the insertion loss of the filter can be reduced. Further, by using the electrode material having a small insertion loss, the width of the internal electrode of the inductor electrode layer can be further reduced, and the size can be reduced.

【0018】次に本発明の一実施の形態を、図面を参照
しながら説明する。図1は本発明の一実施の形態を示す
積層型ノイズフィルタの分解斜視図である。図2は同実
施の形態の外観図、図3は同実施の形態の透視図、図4
は同実施の形態の等価回路図、図5は同実施の形態の特
性図、図6は特性評価の測定回路図である。
Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a laminated noise filter according to an embodiment of the present invention. FIG. 2 is an external view of the embodiment, FIG. 3 is a perspective view of the embodiment, and FIG.
Is an equivalent circuit diagram of the embodiment, FIG. 5 is a characteristic diagram of the embodiment, and FIG. 6 is a measurement circuit diagram of the characteristic evaluation.

【0019】まず、セラミックス層は、誘電率100の
Bi−Zn−Cu−O系の約900℃で焼結する材料組
成の粉末を用いて作製した高誘電率のセラミックス層
と、前記誘電率100のBi−Zn−Cu−O系の材料
組成の粉末にフォルステライトガラス成分を加えて作成
した低誘電率のセラミックス層を準備し、これらを用い
て後述の各部品が構成される。尚、前記900℃の条件
は後述する電極ペースト(Agを主成分とする電極ペー
スト)と併用し作業性の向上を図ったものである。
First, the ceramic layer is made of a high dielectric constant ceramic layer made of a Bi-Zn-Cu-O-based powder having a dielectric constant of 100 and having a material composition that sinters at about 900 ° C. A low dielectric constant ceramic layer prepared by adding a forsterite glass component to a powder of a Bi-Zn-Cu-O-based material composition of Example 1 is prepared, and these components are used to form components. The condition of 900 ° C. is used in combination with an electrode paste described later (an electrode paste containing Ag as a main component) to improve workability.

【0020】図2の外観図において、1は積層型ノイズ
フィルタであり、この積層型ノイズフィルタ1には積層
体2の相対向する側面に外部電極3,4が形成され、正
面と背面にそれぞれ外部接地電極5,6が形成されてい
る。その具体的構成について図1の分解斜視図を用いて
説明する。
In the external view of FIG. 2, reference numeral 1 denotes a multilayer noise filter. External noise electrodes 3 and 4 are formed on opposing side surfaces of a multilayer body 2 in the multilayer noise filter 1, and are provided on the front and rear surfaces, respectively. External ground electrodes 5 and 6 are formed. The specific configuration will be described with reference to the exploded perspective view of FIG.

【0021】図1において、7a,7b,7cは接地電
極層、8はコンデンサ電極層、9はインダクタ電極層で
ある。接地電極層7a,7b,7cは、コンデンサ電極
層8とインダクタ電極層9との間と外面に配置されて、
コンデンサ電極層8の共通接地電極となり、インダクタ
とコンデンサ間の不要な干渉を防止する作用を有し、ま
た、前記コンデンサ電極層8とインダクタ電極層9間と
の拡散防止層としての作用を有するものである。
In FIG. 1, 7a, 7b and 7c are ground electrode layers, 8 is a capacitor electrode layer, and 9 is an inductor electrode layer. The ground electrode layers 7a, 7b, 7c are arranged between the capacitor electrode layer 8 and the inductor electrode layer 9 and on the outer surface,
A capacitor that serves as a common ground electrode for the capacitor electrode layer 8 and has a function of preventing unnecessary interference between the inductor and the capacitor, and also has a function of preventing diffusion between the capacitor electrode layer 8 and the inductor electrode layer 9. It is.

【0022】この接地電極層7a,7cは前述の高誘電
率のセラミックス層10上に、接地電極層7bは低誘電
率のセラミックス層21上にそれぞれ内方にAgペース
トを印刷し接地内部電極11を形成して成り、前記接地
内部電極11は前記外部接地電極5,6の配設方向に向
けて第1の延長部12,13を設け十字形に形成されて
おり、その第1の延長部12,13の縁端部は後述の組
立工程で前記外部接地電極5,6に接続されたものであ
る。
The ground electrode layers 7a and 7c are printed on the above-described ceramic layer 10 having a high dielectric constant, and the ground electrode layer 7b is printed on the ceramic layer 21 having a low dielectric constant by printing an Ag paste inward. The grounding internal electrode 11 is formed in a cross shape by providing first extension portions 12 and 13 in the direction in which the external grounding electrodes 5 and 6 are arranged. The edge portions 12 and 13 are connected to the external ground electrodes 5 and 6 in an assembling process described later.

【0023】コンデンサ電極層8は前記接地電極層7
a,7bとの間に小型で大きな分布容量を構成するとと
もにこのコンデンサ電極層8上で電界結合を構成する作
用を有するものである。このコンデンサ電極層8は前述
の高誘電率のセラミックス層10上にAgペーストを印
刷し一対の内部電極14,15を形成して構成され、前
記内部電極14,15はそれぞれ相似形であり外部電極
3,4の配設方向から中央部に向けて延びる第2の延長
部16,17を付設し、それぞれの第2の延長部16,
17は中間部にくびれ18,19を形成し、その第2の
延長部16,17はセラミックス層10上の中央部では
接続されず間隙部20を形成している。前記くびれ1
8,19を形成することで急激なインピーダンスの変化
が生じ容量成分が等価的に付加されるためコンデンサ電
極層8の小型化が図れる。また、前記間隙部20を形成
することで前記接地電極層7a,7bとの間に二つの静
電容量を構成するとともにその間隙部20で電界結合が
生じ、これによって前記インダクタ電極層9の干渉を受
けない副電送線路ができ、前記インダクタ電極層9のイ
ンダクタ成分との***振によってフィルタ特性における
なお一層大きな減衰極を構成しノイズの除去にすぐれた
効果を有する。また、前記内部電極14,15をそれぞ
れ相似形とすることでインピーダンス整合が図れるため
所望の信号を損することがなくノイズに対する減衰特性
が良好である。
The capacitor electrode layer 8 is formed on the ground electrode layer 7.
a and 7b, and has a function of forming a large distributed capacitance and also forming an electric field coupling on the capacitor electrode layer 8. The capacitor electrode layer 8 is formed by printing an Ag paste on the above-mentioned ceramic layer 10 having a high dielectric constant to form a pair of internal electrodes 14 and 15. Second extension portions 16 and 17 extending from the disposition direction of 3 and 4 toward the center portion are provided, and the second extension portions 16 and 17 are respectively provided.
Reference numeral 17 designates constrictions 18 and 19 at the intermediate portion, and second extension portions 16 and 17 thereof are not connected at the central portion on the ceramic layer 10 to form a gap portion 20. The constriction 1
The formation of 8, 19 causes a rapid change in impedance and equivalently adds a capacitance component, whereby the size of the capacitor electrode layer 8 can be reduced. Also, by forming the gap 20, two capacitances are formed between the ground electrode layers 7a and 7b, and electric field coupling occurs in the gap 20, thereby causing interference of the inductor electrode layer 9. A sub-transmission line which is not affected by the noise is formed, and the anti-resonance with the inductor component of the inductor electrode layer 9 forms a still larger attenuation pole in the filter characteristic, thereby having an excellent effect of removing noise. In addition, since the internal electrodes 14 and 15 have similar shapes, impedance matching can be achieved, so that a desired signal is not impaired and noise attenuation characteristics are good.

【0024】インダクタ電極層9は前記の外部電極3,
4間にインダクタを構成する作用を有するものである。
このインダクタ電極層9は前述の低誘電率のセラミック
ス層21上に、Agペーストを印刷して外部電極3,4
を配設する縁端部で外部電極3,4に接続した極狭幅の
インダクタ内部電極22を形成して成り、前記インダク
タ内部電極22は両端では電極幅が幅広部23,24、
その中間部では電極幅の狭い幅狭部25を形成して成
る。前記の通り電極幅を変化させることでインピーダン
スの急激な変化が生じるため直列のインダクタ成分が等
価回路に付加されインダクタ機能の強化が図れ、コンデ
ンサとの電磁干渉も防止できる。
The inductor electrode layer 9 includes the external electrodes 3 and
It has the function of forming an inductor between the four.
The inductor electrode layer 9 is formed by printing an Ag paste on the above-mentioned low dielectric constant ceramic layer 21 to form external electrodes 3 and 4.
Are formed at the edges where the internal electrodes 22 are arranged, and the inductor internal electrodes 22 are connected to the external electrodes 3 and 4 at a very narrow width.
An intermediate portion is formed by forming a narrow portion 25 having a narrow electrode width. As described above, a sudden change in impedance is caused by changing the electrode width, so that a series inductor component is added to the equivalent circuit, thereby enhancing the inductor function and preventing electromagnetic interference with the capacitor.

【0025】最上段の26は内部電極層を持たない無効
層であり、最下段の接地電極層7cのセラミックス層1
0とともに前記接地電極層7a,7b、コンデンサ電極
層8、インダクタ電極層9等を構成するセラミックス層
と同一の、誘電体、磁性体、半導体のいずれか一つから
選択された同一材料から形成して成り、この構成によっ
て異種材料間の収縮率や焼結差に起因するソリ、層間剥
離等の損傷を防止でき信頼性が優れたものと成る。
The uppermost layer 26 is an ineffective layer having no internal electrode layer, and is the ceramic layer 1 of the lowermost ground electrode layer 7c.
0 and the same ceramic layer constituting the ground electrode layers 7a and 7b, the capacitor electrode layer 8, the inductor electrode layer 9, etc., and the same material selected from any one of a dielectric material, a magnetic material, and a semiconductor. With this configuration, damages such as warpage and delamination due to the shrinkage ratio and sintering difference between different materials can be prevented, and the reliability is excellent.

【0026】前記の通り構成した接地電極層7a〜7
c、コンデンサ電極層8、インダクタ電極層9、無効層
26を積みかさね加圧を加え図2に示す積層体2を得
て、その後、前記積層体2の外部電極3,4および外部
接地電極5,6には、Agあるいはガラスフリットを含
有したAgを主成分とする電極ペーストを塗布し乾燥さ
せた後に、前記外部電極3,4および外部接地電極5,
6と前記積層体2を同時焼成し積層型ノイズフィルタ1
を得る。この焼成工程においては、あらかじめ積層体2
の各セラミックス層を用い前記Agを主成分とする電極
ペーストとの焼結温度を適合させているため、同時に一
体焼結ができ製造工程が短縮でき生産性が良好である。
The ground electrode layers 7a to 7 configured as described above
c, the capacitor electrode layer 8, the inductor electrode layer 9, and the ineffective layer 26 are stacked and pressurized to obtain the laminate 2 shown in FIG. 2, and thereafter, the external electrodes 3, 4 and the external ground electrode 5 of the laminate 2 are obtained. , 6 are coated with an electrode paste containing Ag or Ag containing glass frit as a main component and dried, and then the external electrodes 3, 4 and the external ground electrodes 5,
6 and the laminated body 2 are simultaneously fired to form a laminated noise filter 1.
Get. In this firing step, the laminate 2
Since the sintering temperature with the electrode paste containing Ag as a main component is adjusted by using each of the ceramic layers described above, simultaneous sintering can be performed at the same time, the manufacturing process can be shortened, and the productivity is good.

【0027】図3の同実施の形態の透視図は、接地電極
層7a,7b.7cとインダクタ電極層9の配置関係を
示すものであり、インダクタ電極層9の幅広部23,2
4は前記コンデンサ電極層8のコンデンサ内部電極1
4,15と重ならないように外側に配置し、前記インダ
クタ電極層9と接地電極層7a,7b,7cとの浮遊容
量の発生を低減し、小型で減衰特性の優れた積層型ノイ
ズフィルタを得るように構成されている。
FIG. 3 is a perspective view of the same embodiment, showing ground electrode layers 7a, 7b. 7c shows an arrangement relationship between the inductor electrode layer 9 and the wide portions 23, 2 of the inductor electrode layer 9.
4 is a capacitor internal electrode 1 of the capacitor electrode layer 8
4 and 15 are arranged outside so as not to overlap with each other to reduce the occurrence of stray capacitance between the inductor electrode layer 9 and the ground electrode layers 7a, 7b and 7c, thereby obtaining a small-sized multilayer noise filter having excellent attenuation characteristics. It is configured as follows.

【0028】次に、図4を用いて本実施の形態の等価回
路図を説明する。図4において、3T,4Tは前記図2
の外部電極3,4に対応した外部電極端子を示し、5
T,6Tはそれぞれ外部接地電極5,6に対応した外部
接地電極端子を示す。前記外部接地電極端子5T,6T
の間に前記インダクタ電極層9から成るインダクタ成分
L1を構成し、前記コンデンサ電極層8の一対の内部電
極14,15の間隙間で静電容量C3を構成し、また、
外部接地電極5と外部接地電極端子5T、外部接地電極
6と外部接地電極端子6Tの間にはそれぞれ前記のコン
デンサ電極層8に形成した一対のコンデンサ内部電極1
4,15が高誘電率のセラミックス層10を介し発現し
た静電容量C1,C2を構成して成る。
Next, an equivalent circuit diagram of the present embodiment will be described with reference to FIG. In FIG. 4, 3T and 4T correspond to FIG.
External electrode terminals corresponding to the external electrodes 3 and 4 of FIG.
T and 6T indicate external ground electrode terminals corresponding to the external ground electrodes 5 and 6, respectively. The external ground electrode terminals 5T, 6T
Between the pair of internal electrodes 14 and 15 of the capacitor electrode layer 8 to form an electrostatic capacitance C3.
Between the external ground electrode 5 and the external ground electrode terminal 5T, and between the external ground electrode 6 and the external ground electrode terminal 6T, a pair of capacitor internal electrodes 1 formed on the capacitor electrode layer 8 is provided.
4 and 15 constitute the capacitances C1 and C2 developed through the ceramic layer 10 having a high dielectric constant.

【0029】また、7T(破線)はシールドであり前記
接地電極層7a,7b,7cにより形成されインダクタ
L1と静電容量C1,C2,C3との間を電気的にシー
ルドし、さらにインダクタL1と静電容量C1,C2,
C3全体を包みこむようにシールドしており、高周波信
号の取り扱いに極めて重要である不要輻射による干渉を
防止でき、小型の積層型ノイズフィルタを得ることがで
きる。
Reference numeral 7T (broken line) denotes a shield, which is formed by the ground electrode layers 7a, 7b, and 7c, electrically shields between the inductor L1 and the capacitances C1, C2, and C3. Capacitance C1, C2
Since the entire C3 is shielded so as to surround it, interference due to unnecessary radiation which is extremely important for handling high-frequency signals can be prevented, and a small stacked noise filter can be obtained.

【0030】本実施の形態のフィルタ特性を図6の測定
回路図に基づき測定しその結果を図5に特性例として示
す。図5は100MHz〜10GHzの周波数を本実施の形
態の積層型フィルタに通過させそのそれぞれの周波数の
電圧減衰量を連続的に示した。この減衰曲線Aは減衰極
Bを有し、その減衰量Cは約55dBを示しており極め
て優れたフィルタ特性を示している。また接続用コード
減衰極Bの周波数は前記のコンデンサ電極層8のコンデ
ンサ内部電極14,15の間隙部20の距離によって調
整可能でありきわめて生産性が良好である。
The filter characteristics of the present embodiment are measured based on the measurement circuit diagram of FIG. 6, and the results are shown in FIG. 5 as characteristic examples. FIG. 5 shows that the frequency of 100 MHz to 10 GHz is passed through the multilayer filter of the present embodiment, and the voltage attenuation at each frequency is shown continuously. The attenuation curve A has an attenuation pole B, and the attenuation amount C is about 55 dB, which indicates an extremely excellent filter characteristic. Further, the frequency of the connection cord attenuating pole B can be adjusted by the distance of the gap 20 between the capacitor internal electrodes 14 and 15 of the capacitor electrode layer 8, so that the productivity is extremely good.

【0031】尚、前述の実施の形態においてコンデンサ
電極層8のセラミックス層10を高誘電率のセラミック
ス層と記載したがバリスタ特性を兼ね備えた材料を使用
することでノイズの電圧波高値選択形のサージアブソー
バーとしての複合機能を備えることができる。また、前
記インダクタ電極層9のセラミックス層21に磁性体を
使用すると更に大きなインダクタが得られインダクタ電
極層9の小型化が可能となる。
In the above-described embodiment, the ceramic layer 10 of the capacitor electrode layer 8 is described as a ceramic layer having a high dielectric constant. However, by using a material having a varistor characteristic, a surge of a voltage peak value selection type of noise can be obtained. A composite function as an absorber can be provided. If a magnetic material is used for the ceramic layer 21 of the inductor electrode layer 9, a larger inductor can be obtained, and the inductor electrode layer 9 can be reduced in size.

【0032】[0032]

【発明の効果】以上本発明の構成によれば、積層して成
るコンデンサ成分とインダクタ成分が相互に干渉し合っ
てフィルタ特性を損することが無く、挿入損失を低減で
き、高周波帯域のノイズ除去効果の優れた小型の積層型
ノイズフィルタが得られる。また、フィルタ特性におけ
る減衰極の周波数は容易に調整できるため。各種の電子
機器固有のフィルタ特性に対応できる。
As described above, according to the structure of the present invention, the capacitor component and the inductor component, which are laminated, do not interfere with each other to impair the filter characteristics, the insertion loss can be reduced, and the noise removal effect in the high frequency band can be reduced. Thus, a small-sized laminated noise filter having excellent characteristics can be obtained. Also, the frequency of the attenuation pole in the filter characteristics can be easily adjusted. It is possible to cope with filter characteristics unique to various electronic devices.

【0033】さらに、本発明のセラミックス層の材料を
使用することにより積層工程においてソリや層間剥離な
どの損傷を防止でき信頼性の優れた積層型ノイズフィル
タが得られる。また、規程の電極ペーストと併用するこ
とにより、積層後、積層体と電極ペーストを同時に一体
焼結し所定の特性を得ることができるため極めて生産性
が良好である。
Further, by using the material for the ceramic layer of the present invention, damages such as warpage and delamination can be prevented in the laminating step, and a laminated noise filter excellent in reliability can be obtained. In addition, by using together with the prescribed electrode paste, after lamination, the laminate and the electrode paste can be simultaneously sintered to obtain predetermined characteristics, so that the productivity is extremely good.

【0034】従って、本発明の積層型ノイズフィルタは
各種電子機器の小型化、デジタル機器の小型化、高性能
化に寄与することが大である。
Therefore, the multilayer noise filter of the present invention greatly contributes to miniaturization of various electronic devices and miniaturization and high performance of digital devices.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の一実施の形態を示す積層型ノイズフィ
ルタの分解斜視図
FIG. 1 is an exploded perspective view of a laminated noise filter according to an embodiment of the present invention.

【図2】同実施の形態の外観図FIG. 2 is an external view of the embodiment.

【図3】同実施の形態の透視図FIG. 3 is a perspective view of the embodiment.

【図4】同実施の形態の等価回路図FIG. 4 is an equivalent circuit diagram of the embodiment.

【図5】同実施の形態の特性図FIG. 5 is a characteristic diagram of the embodiment.

【図6】同特性評価の測定回路図FIG. 6 is a measurement circuit diagram of the characteristic evaluation.

【符号の説明】[Explanation of symbols]

1 積層型ノイズフィルタ 2 積層体 3,4 外部電極 5,6 外部接地電極 7a,7b,7c 接地電極層 8 コンデンサ電極層 9 インダクタ電極層 10 セラミックス層 11 接地内部電極 12,13 第1の延長部 14,15 コンデンサ内部電極 16,17 第2の延長部 18,19 くびれ 20 間隙部 21 セラミックス層 22 インダクタ内部電極 23,24 幅広部 25 幅狭部 26 無効層 Reference Signs List 1 laminated noise filter 2 laminated body 3, 4 external electrode 5, 6 external ground electrode 7a, 7b, 7c ground electrode layer 8 capacitor electrode layer 9 inductor electrode layer 10 ceramic layer 11 ground internal electrode 12, 13 first extension 14, 15 Capacitor internal electrode 16, 17 Second extension 18, 19 Constriction 20 Gap 21 Ceramic layer 22 Inductor internal electrode 23, 24 Wide part 25 Narrow part 26 Invalid layer

フロントページの続き Fターム(参考) 5E001 AB03 AC02 AC09 AF06 AH01 AH09 AJ01 AJ02 AJ03 AZ01 5E082 AA01 AB03 BB02 BC14 BC39 DD04 DD08 EE04 EE11 EE23 EE35 FG26 FG54 GG10 GG11 GG28 MM24 Continued on the front page F term (reference) 5E001 AB03 AC02 AC09 AF06 AH01 AH09 AJ01 AJ02 AJ03 AZ01 5E082 AA01 AB03 BB02 BC14 BC39 DD04 DD08 EE04 EE11 EE23 EE35 FG26 FG54 GG10 GG11 GG28 MM24

Claims (12)

【特許請求の範囲】[Claims] 【請求項1】 セラミックス層と内部電極層とを交互に
積み重ねて積層体とし、この積層体の相対向する側面に
外部電極を形成すると共に正面及び背面の少なくとも一
面に外部接地電極を形成し、前記積層体はセラミックス
層上の内方に前記接地電極の配設方向に向けた第1の延
長部を有し前記外部接地電極と接続した接地内部電極を
形成して成る接地電極層と、セラミックス層上に前記外
部電極の配設方向の相対向する縁端部からそれぞれ中央
部に向けて一対の第2の延長部を持つコンデンサ内部電
極を形成して成るコンデンサ電極層と、セラミックス層
上に前記相対向する外部電極間を接続したインダクタ内
部電極を形成して成るインダクタ電極層とより構成し、
前記接地電極層を前記コンデンサ電極層とインダクタ電
極層の間および前記コンデンサ電極層とインダクタ電極
層の外面に備えた積層型ノイズフィルタ。
1. A laminate in which ceramic layers and internal electrode layers are alternately stacked to form a laminate, external electrodes are formed on opposing side surfaces of the laminate, and external ground electrodes are formed on at least one of the front and back surfaces. A ground electrode layer formed by forming a grounding internal electrode connected to the external grounding electrode, the laminated body having a first extension inward of the grounding electrode in a direction in which the grounding electrode is provided; A capacitor electrode layer formed by forming a pair of second extension portions from the opposite edge portions in the disposition direction of the external electrodes toward the center portion on the layer, and a ceramic electrode layer; An inductor electrode layer formed by forming an inductor internal electrode connected between the opposed external electrodes,
A multilayer noise filter comprising the ground electrode layer provided between the capacitor electrode layer and the inductor electrode layer and on the outer surfaces of the capacitor electrode layer and the inductor electrode layer.
【請求項2】 コンデンサ電極層の一対の延長部はセラ
ミックス層上で接触することがなく間隙部を構成し、前
記接地内部電極との間に第1、第2のコンデンサを形成
すると共に前記一対の延長部の間隙部で電界結合し、イ
ンダクタ電極層のインダクタ成分との***振によって減
衰極を構成して成る請求項1に記載の積層型ノイズフィ
ルタ。
2. A pair of extensions of a capacitor electrode layer forms a gap without contacting on a ceramic layer, and forms first and second capacitors between the capacitor electrode layer and the grounding internal electrode. 2. The multilayer noise filter according to claim 1, wherein electric field coupling is performed in a gap portion of the extension portion of the first layer, and an attenuation pole is formed by anti-resonance with an inductor component of the inductor electrode layer.
【請求項3】 コンデンサ電極層の一対の第1の延長部
の少なくとも一方がその延長部の両端の間で電極幅にく
びれを形成して成る請求項1に記載の積層型ノイズフィ
ルタ。
3. The multilayer noise filter according to claim 1, wherein at least one of the pair of first extension portions of the capacitor electrode layer has a narrowed electrode width between both ends of the extension portion.
【請求項4】 コンデンサ電極層の一対の延長部は相似
形に形成して成る請求項1に記載の積層型ノイズフィル
タ。
4. The multilayer noise filter according to claim 1, wherein a pair of extensions of the capacitor electrode layer are formed in a similar shape.
【請求項5】 インダクタ電極層の内部電極層を両端の
幅広部と中間の幅狭部から形成し、前記幅広部はコンデ
ンサ電極層の内部電極層と重ならないように外側に配置
して成る請求項1に記載の積層型ノイズフィルタ。
5. An internal electrode layer of the inductor electrode layer is formed of a wide portion at both ends and a narrow portion in the middle, and the wide portion is disposed outside so as not to overlap with the internal electrode layer of the capacitor electrode layer. Item 2. The stacked noise filter according to Item 1.
【請求項6】 外部接地電極は積層体の正面と背面の一
対に形成し、接地電極層の第1の延長部を前記一対の外
部接地電極に向けて相対向して設け内部電極を十字形に
形成し、前記一対の第1の延長部の縁端部と前記一対の
外部接地電極を接続して成る請求項1に記載の積層型ノ
イズフィルタ。
6. An external ground electrode is formed in a pair of a front surface and a rear surface of the laminate, and a first extension of a ground electrode layer is provided to face the pair of external ground electrodes, and an internal electrode is formed in a cross shape. 2. The multilayer noise filter according to claim 1, wherein the end portions of the pair of first extension portions are connected to the pair of external ground electrodes. 3.
【請求項7】 インダクタ電極層のインダクタ内部電極
と上下に隣接するセラミックス層を前記コンデンサ電極
層のセラミックス層より低い誘電率から成る誘電体材料
で形成して成る請求項1に記載の積層型ノイズフィル
タ。
7. The laminated noise according to claim 1, wherein a ceramic layer vertically adjacent to the inductor internal electrode of the inductor electrode layer is formed of a dielectric material having a lower dielectric constant than the ceramic layer of the capacitor electrode layer. filter.
【請求項8】 インダクタ電極層のセラミックス層を磁
性体材料で形成して成る請求項1に記載の積層型ノイズ
フィルタ。
8. The multilayer noise filter according to claim 1, wherein the ceramic layer of the inductor electrode layer is formed of a magnetic material.
【請求項9】 インダクタ電極層のセラミックス層を誘
電体材料か磁性体材料のいずれか一方で形成し、コンデ
ンサ電極層のセラミックス層をバリスタ材料で形成して
成る請求項1に記載の積層型ノイズフィルタ。
9. The multilayer noise according to claim 1, wherein the ceramic layer of the inductor electrode layer is formed of one of a dielectric material and a magnetic material, and the ceramic layer of the capacitor electrode layer is formed of a varistor material. filter.
【請求項10】 コンデンサ電極層とインダクタ電極層
との間に接地電極層を配置し、それぞれの外形が同一に
重なり合い、前記接地電極層が前記コンデンサ電極層と
インダクタ電極層間との拡散防止層とした請求項1に記
載の積層型ノイズフィルタ。
10. A ground electrode layer is arranged between a capacitor electrode layer and an inductor electrode layer, and their outer shapes are identically overlapped, and the ground electrode layer is provided with a diffusion preventing layer between the capacitor electrode layer and the inductor electrode layer. The stacked noise filter according to claim 1.
【請求項11】 積層体の最上段層と最下段層が、磁性
体、誘電体、半導体のいずれか一つより選ばれた同一材
料層により構成し焼成して成る請求項1に記載の積層型
ノイズフィルタ。
11. The laminate according to claim 1, wherein the uppermost layer and the lowermost layer of the laminate are formed of the same material layer selected from one of a magnetic substance, a dielectric substance, and a semiconductor, and are fired. Type noise filter.
【請求項12】 積層体において、外部電極にはAgあ
るいはガラスフリットを含有させたAgを主成分とする
電極ペースト、内部電極にはAgを主成分とする電極ペ
ーストを用い、焼成前の積層体に前記外部電極を形成
し、前記外部電極と前記積層体を同時焼成して成る請求
項1に記載の積層型ノイズフィルタ。
12. A laminate before firing, wherein an electrode paste containing Ag or Ag containing glass frit as a main component is used for an external electrode and an electrode paste containing Ag as a main component is used for an internal electrode. The multilayer noise filter according to claim 1, wherein the external electrode is formed on the external electrode, and the external electrode and the laminate are simultaneously fired.
JP10294947A 1998-10-16 1998-10-16 Laminated-type noise filter Pending JP2000124068A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10294947A JP2000124068A (en) 1998-10-16 1998-10-16 Laminated-type noise filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10294947A JP2000124068A (en) 1998-10-16 1998-10-16 Laminated-type noise filter

Publications (1)

Publication Number Publication Date
JP2000124068A true JP2000124068A (en) 2000-04-28

Family

ID=17814352

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10294947A Pending JP2000124068A (en) 1998-10-16 1998-10-16 Laminated-type noise filter

Country Status (1)

Country Link
JP (1) JP2000124068A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2383198B (en) * 2001-06-21 2005-05-25 Murata Manufacturing Co Noise filter
JP2005244286A (en) * 2004-02-24 2005-09-08 Hitachi Metals Ltd Laminated low pass filter, and high frequency switch module using the same
US6943646B2 (en) * 2003-11-14 2005-09-13 Doron Gamliel Isolation of miniature filters
DE102006013227A1 (en) * 2005-11-11 2007-05-16 Epcos Ag Electrical multilayer component
EP1538641A3 (en) * 2003-12-03 2007-06-06 Epcos Ag Electric component and circuit arrangement
JP2013507757A (en) * 2009-10-12 2013-03-04 エプコス アーゲー Electrical multilayer components and circuit devices

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2383198B (en) * 2001-06-21 2005-05-25 Murata Manufacturing Co Noise filter
US7091800B2 (en) 2001-06-21 2006-08-15 Murata Manufacturing Co., Ltd. Noise filter
US6943646B2 (en) * 2003-11-14 2005-09-13 Doron Gamliel Isolation of miniature filters
EP1538641A3 (en) * 2003-12-03 2007-06-06 Epcos Ag Electric component and circuit arrangement
EP2246866A1 (en) * 2003-12-03 2010-11-03 Epcos Ag Electric component and circuit arrangement
JP2005244286A (en) * 2004-02-24 2005-09-08 Hitachi Metals Ltd Laminated low pass filter, and high frequency switch module using the same
DE102006013227A1 (en) * 2005-11-11 2007-05-16 Epcos Ag Electrical multilayer component
JP2013507757A (en) * 2009-10-12 2013-03-04 エプコス アーゲー Electrical multilayer components and circuit devices

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