JPH03161910A - Impedance element - Google Patents
Impedance elementInfo
- Publication number
- JPH03161910A JPH03161910A JP1300809A JP30080989A JPH03161910A JP H03161910 A JPH03161910 A JP H03161910A JP 1300809 A JP1300809 A JP 1300809A JP 30080989 A JP30080989 A JP 30080989A JP H03161910 A JPH03161910 A JP H03161910A
- Authority
- JP
- Japan
- Prior art keywords
- ferrite
- impedance
- impedance element
- present
- conductor
- 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.)
- Granted
Links
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 41
- 239000004020 conductor Substances 0.000 claims abstract description 19
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 229910052725 zinc Inorganic materials 0.000 claims abstract 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000001629 suppression Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 2
- 229910052749 magnesium Inorganic materials 0.000 abstract 1
- 230000035699 permeability Effects 0.000 description 14
- 239000010949 copper Substances 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 229910002535 CuZn Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- LQBJWKCYZGMFEV-UHFFFAOYSA-N lead tin Chemical compound [Sn].[Pb] LQBJWKCYZGMFEV-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Landscapes
- Soft Magnetic Materials (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
【発明の詳細な説明】
（産業」二の利用分野）
本発明は電子機器に組み込まれる電子回路部品の一種で
あるチップ状インピーダンス素子に関し、更に詳しくは
５００ＭＨｚ以」二の高周波領域で使用されるノイズ抑
制用のインピーダンス素子に関する。Detailed Description of the Invention (Field of Application in Industry) The present invention relates to a chip-shaped impedance element which is a type of electronic circuit component incorporated into electronic equipment, and more specifically, it is used in a high frequency region of 500 MHz or higher. The present invention relates to an impedance element for noise suppression.
（従来技術とその問題点）
従来ビーズフィルターと称する小型のチップ状インピー
ダンス素子が広く使用されている。この素子は例えば導
電路におけるノイズ抑制のために使用される。これらの
素子は典型的には磁性フェライトの貫通孔に導体を挿通
したものであり、インピーダンスを大きくするにはフェ
ライトを長くする必要があるため大型化するので、大き
いインピーダンスが必要な場合には、例えば特開昭６０
−６３９０６号等により提案されているような、導電路
の長いものが使用されている。(Prior art and its problems) Conventionally, small chip-shaped impedance elements called bead filters have been widely used. This element is used, for example, for noise suppression in conductive paths. These elements typically have a conductor inserted through a through hole in magnetic ferrite, and in order to increase the impedance, the ferrite must be made longer, making them larger, so if a large impedance is required, For example, JP-A-60
A device with a long conductive path, such as that proposed in No. 63906, is used.
本発明のｌ例を示す第２図は構造上は上記公報に記載の
従来のチップ状インダクタンス素子と同様であるので、
これらの図を参照して従来技術のインピーダンス素子を
説明するに、インピーダンス素子はスビネル型のＭｅＯ
−Ｆｅ２０３ （ここにＭｅは２価のＣｕ，Ｎｉ、Ｍ
ｎ．Ｍｇ．Ｚｎより選択される少なくとも一種以」二）
よりなる透磁性のフェライト素体ｌに、貫通孔２、２を
形成し、貫通孔内面に導体３、３を被着し、これらの導
体を電極ないし導電路４、４、４により直列に接続し、
両端は端子電極５、５に接続する。導体３、３により生
じる磁束は互いに反対方向になり相殺するように接続さ
れている。FIG. 2, which shows an example of the present invention, is structurally similar to the conventional chip-shaped inductance element described in the above publication.
To explain the impedance element of the prior art with reference to these figures, the impedance element is a Subinel type MeO
-Fe203 (here Me is divalent Cu, Ni, M
n. Mg. At least one selected from Zn2)
Through-holes 2, 2 are formed in a magnetically permeable ferrite element body l, and conductors 3, 3 are deposited on the inner surface of the through-hole, and these conductors are connected in series by electrodes or conductive paths 4, 4, 4. death,
Both ends are connected to terminal electrodes 5,5. The conductors 3, 3 are connected so that the magnetic fluxes generated by them are in opposite directions and cancel each other out.
上記の従来技術によるチップ状インピーダンス素子は小
型で大きいインピーダンスを有することが知られている
が、５ ０ ０ＭＨ ｚ以上の高周波域では充分でなく
、又ノイズ抑制効果が充分に得られない。Although it is known that the chip-shaped impedance element according to the above-mentioned prior art is small and has a large impedance, it is not sufficient in a high frequency range of 500 MHz or more, and cannot sufficiently suppress noise.
（発明の目的）
本発明の目的は高周波において充分なインピーダンスを
有する素子を提供することにある。(Objective of the Invention) An object of the present invention is to provide an element having sufficient impedance at high frequencies.
本発明の目的は特に５００Ｍ Ｈ ｚ以上の周波数にお
いて高いインピーダンスを有するインピーダンス素子を
提供することにある。It is an object of the present invention to provide an impedance element having high impedance, especially at frequencies above 500 MHz.
（発明の概要）
本発明は、フェライト素体の第１面よりそれと相対向す
る第２面へ貫通する１個又は複数個の貫通孔を有するチ
ップ状のフェライト素体と、該貫通孔に形成された少な
くとも１本の導体と、前記導体をフェライト素体の表面
で直列に接続する外部導体とよりなるインピーダンス素
子において、前記フェライ１・素体が六方品系フェライ
トＢａ３Ｃｏｗ Ｍｅ２−ｘ Ｆｅ２４０＜＋ （ここ
にＸは０．６〜２、ＭｅはＣｕ．Ｎｉ．Ｍｎ，Ｍｇ，Ｚ
ｎより選択される少なくとも一種）より構成されている
ことを特徴とするインピーダンス素子である。(Summary of the Invention) The present invention provides a chip-shaped ferrite element body having one or more through holes penetrating from a first surface of the ferrite element body to a second surface opposite thereto; and an external conductor connecting the conductor in series on the surface of a ferrite element, in which the ferrite 1 and the element are made of hexagonal ferrite Ba3Cow Me2-x Fe240<+ (where , X is 0.6 to 2, Me is Cu.Ni.Mn, Mg, Z
This is an impedance element characterized by comprising at least one type selected from n.
本発明のインピーダンス素子は、高周波、特に５００Ｍ
Ｈｚ以上で使用される時大きいインピーダンスを示す。The impedance element of the present invention is suitable for high frequency, especially 500M
It exhibits large impedance when used at frequencies above Hz.
（発明の具体的な説明）
本発明の特徴は前記フェライト素体が六方品系フェライ
トＢａ３Ｃｏｗ Ｍｅ２−＋＋ Ｆｅｚ４Ｏ４１ （こ
こにＸは０６以上で２以下の値、ＭｅはＣｕ、Ｎｉ．Ｍ
ｎ．Ｍｇ．Ｚｎより選択される少なくとも一種）より構
成されていることにある。この材料は従来のスビネル型
磁性フェライト素体を用いたインピーダンス素子に比し
て、極めて高周波の領域で大きいインピーダンスを示し
、高周波ノイズの抑制に大きな効果を発揮する。(Specific Description of the Invention) The present invention is characterized in that the ferrite element is a hexagonal ferrite Ba3Cow Me2-++ Fez4O41 (where X is a value of 06 or more and 2 or less, Me is Cu, Ni.M
n. Mg. Zn). Compared to impedance elements using conventional Subinel-type magnetic ferrite elements, this material exhibits a large impedance in extremely high frequency regions and is highly effective in suppressing high frequency noise.
フェライト素体は所定の原料組成物を仮焼成し、次いで
所定のバインダーと混合し、所定の形状に成形し、高温
度で本焼成したものよりなる。The ferrite element body is made by pre-sintering a predetermined raw material composition, then mixing it with a predetermined binder, molding it into a predetermined shape, and main firing at a high temperature.
第ｌ図は本発明のインピーダンス素子の１例を示す。FIG. 1 shows an example of the impedance element of the present invention.
インピーダンス素子は六方品系フェライト素体１に、貫
通孔２を形威し、この貫通孔内面に導電ペーストの流し
込み、あるいは無電解めっき等で導電膜を形成し、必要
なら更に電気めっきを施すことにより導体３を被着し、
この導体を電極ないし導電路４、４により直列に接続し
、最後にフェライト素体の対向した面に形成した端子電
極５、５に接続ずる。導電路及び電極は好ましくは別田
願の対象である第ｌ層を銅、第２Ｎをニッケル、第３層
を銅、及び第４層を錫又は錫一鉛とした順次積層体より
なる導電路より構成するか、更に好ましくはフェライト
基村上に銀層又は銀合金層を予め設ける。この様にする
と導電路の輪郭がめつき中に所定寸法からはみ出すこと
がないので有利である。The impedance element is made by forming a through hole 2 in a hexagonal ferrite element body 1, and forming a conductive film on the inner surface of the through hole by pouring a conductive paste or by electroless plating, and further applying electroplating if necessary. A conductor 3 is applied,
These conductors are connected in series by electrodes or conductive paths 4, 4, and finally connected to terminal electrodes 5, 5 formed on opposing surfaces of the ferrite element body. The conductive paths and electrodes are preferably conductive paths made of a sequential laminate in which the first layer is made of copper, the second layer is made of nickel, the third layer is made of copper, and the fourth layer is made of tin or tin-lead. More preferably, a silver layer or a silver alloy layer is provided on the ferrite base layer in advance. This is advantageous because the contour of the conductive path does not extend beyond the predetermined dimensions during plating.
第２図は本発明のインピーダンス素子の他の構造例を示
す。FIG. 2 shows another example of the structure of the impedance element of the present invention.
インピーダンス素子は六方品系フェライト素体１に、２
個の貫通孔２、２を形成し、これらの貫通孔内面に導体
３、３を被着し、これらの導体を電極ないし導電路４、
４、４により直列に接続し、最後に端子電極５、５に接
続する。導体３、３により生じる磁束は互いに反対方向
になり相殺するように接続されている。The impedance element is a hexagonal ferrite element 1, 2
through-holes 2, 2 are formed, conductors 3, 3 are adhered to the inner surfaces of these through-holes, and these conductors are used as electrodes or conductive paths 4,
4 and 4 are connected in series, and finally connected to terminal electrodes 5 and 5. The conductors 3, 3 are connected so that the magnetic fluxes generated by them are in opposite directions and cancel each other out.
第３図は本発明のインピーダンス素子の更に他の構造例
を示す。FIG. 3 shows still another structural example of the impedance element of the present invention.
インピーダンス素子は六方品系フェライト素体１に、３
つの平行な貫通孔２、２、２を形成し、これらの貫通孔
内面に導体３、３、３をそれぞれ被着し、これらの導体
を電極ないし導電路４、４、４、４により直列に接続し
、最後に端子電極５、５に接続する。導体３、３、３に
より生じる磁束は互いに反対方向になり相殺するように
接続されている。The impedance element is a hexagonal ferrite element 1, 3
Two parallel through holes 2, 2, 2 are formed, conductors 3, 3, 3 are respectively deposited on the inner surfaces of these through holes, and these conductors are connected in series by electrodes or conductive paths 4, 4, 4, 4. and finally connect to the terminal electrodes 5, 5. The magnetic fluxes generated by the conductors 3, 3, 3 are connected so that they are in opposite directions and cancel each other out.
＝こ桓例１２、３、４
フェライト素体にＢａ３ＣＯ２ Ｆｅ２４Ｏ４１を使用
し、次ぎの寸法のインピーダンス素子を製造した。= Examples 12, 3, and 4 Using Ba3CO2 Fe24O41 as a ferrite element, impedance elements having the following dimensions were manufactured.
第１図の構造を有し、縦１． ２ ｍ ｍ、横２．０ｍ
ｍ、高さ０． ９ ｍ ｍのもの（実施例１）第２図の
構造を有し、縦１． ６ ｍ ｍ、横３．２ｍｍ、高さ
１．１ｍｍのもの（実施例２）第２図の構造を有し、縦
２． ５ ｍ ｍ、横３．２ｍｍ、高さ１．３ｍｍのも
の（実施例３）第３図の構造を有し、縦３． ２ ｍ
ｍ、横４．５ｍｍ、高さ１． ６ ｍ ｍのもの（実施
例４）従Ｌ伊１１、２、３、４
比較のため実施例１、２、３、４において六方晶系フェ
ライトの代わりにスビネル型Ｎｉ−ＣｕＺｎフェライト
を使用した他は同一の構造のインピーダンス素子を製造
した。It has the structure shown in Fig. 1, with vertical 1. 2mm, width 2.0m
m, height 0. 9 mm (Example 1) It has the structure shown in Fig. 2, and has a length of 1. 6 mm, width 3.2 mm, and height 1.1 mm (Example 2) It has the structure shown in Fig. 2, and has a length of 2.2 mm. 5 mm, width 3.2 mm, and height 1.3 mm (Example 3) It has the structure shown in Fig. 3, and has a length of 3.2 mm. 2 m
m, width 4.5mm, height 1. 6 mm (Example 4) Sub-Lite 11, 2, 3, 4 For comparison, Subinel type Ni-CuZn ferrite was used instead of hexagonal ferrite in Examples 1, 2, 3, and 4. manufactured an impedance element with the same structure.
上記のインピーダンス素子のインピーダンス特性を測定
したところ第４図の結果を得た。When the impedance characteristics of the impedance element described above were measured, the results shown in FIG. 4 were obtained.
（作用効果）
図から明らかな様に、インピーダンスのピークはスビネ
ル型フェライトに比して高周波側にずれており、しかも
約５００ＭＨｚ以上において従来例よりも大きい。従っ
て、高周波のノイズ抑制などに本発明のインピーダンス
素子は効果を発揮出来ることが分かる。又、構造の違い
によりインピーダンスのピークはかわり、大きいインピ
ーダンスの場合、実施例４の様に従来の同一構造よりも
はるかに高いインピーダンスを設計出来ることが分かる
。(Operation and Effect) As is clear from the figure, the impedance peak is shifted to the high frequency side compared to the Subinel type ferrite, and is larger than that of the conventional example at about 500 MHz or higher. Therefore, it can be seen that the impedance element of the present invention is effective in suppressing high frequency noise. Furthermore, it can be seen that the impedance peak changes depending on the structure, and in the case of a large impedance, it is possible to design a much higher impedance than the conventional same structure as in the fourth embodiment.
次ぎに、線路に挿入した実施例及び従来例のインピーダ
ンス素子の５ ０ ０ Ｍ Ｈ ｚ以上のノイズ抑制効
果を測定したところ次表の結果を得た。数イ１亘はｄＢ
で表わした。Next, the effect of suppressing noise of 500 MHz or more of the impedance elements of the embodiment and the conventional example inserted into the line was measured, and the results shown in the following table were obtained. Number one time is dB
It was expressed as
以上の様に本発明の素子のノイズ抑制効果は大きい。As described above, the noise suppressing effect of the element of the present invention is large.
一般にフェライト素体を使用した場合のインピーダンス
は複素透磁率μ＝μ゜一ｊμ゛に比例する。従って、μ
゜、μ゜゜が大きいほどインピーダンスは大きくなる。Generally, impedance when a ferrite element is used is proportional to complex magnetic permeability μ=μ゜−jμ゛. Therefore, μ
The larger ゜ and μ゜゜, the larger the impedance.
本発明で使用する六方品系フェライトＢａｓ ＣＯＸ
Ｍｅ２−ｘ Ｆｅ２４０ａ＋はこれらの値が大きい。第
５図はＢａ３ＣＯ＋．ｓＣ ｕ ０． ５ Ｆ ｅ ２
４０ ４１、及びＢａａ ＣＯ２ Ｆｅ２＜０４、の透
磁率を示す。対照としてスビネル型Ｎ ｉ Ｆｅ２０ａ
の透磁率を示す。図から本発明の六方品系フェライトは
高周波域において従来よりも大きいインピーダンスを有
することが分かる。Hexagonal ferrite Bas COX used in the present invention
These values are large for Me2-x Fe240a+. Figure 5 shows Ba3CO+. sC u 0. 5 Fe 2
40 41, and Baa CO2 Fe2<04. As a control, Subinel type N i Fe20a
indicates the magnetic permeability of It can be seen from the figure that the hexagonal ferrite of the present invention has a larger impedance than the conventional one in a high frequency range.
９
第６図は六方品系Ｂ ａ ３ Ｃ Ｏ ＋．ｓ Ｍ ｎ
ｏ５Ｆ ｅ ２４０ ４１の透磁率を示す。なおＢａ
３０ｏｚＦ６ ２４ ０ ４Ｈの透磁率とスビネル型Ｎ
ｉ Ｆ ｅ２０４の透磁率を対照として示す。9 Figure 6 shows the hexagonal system B a 3 C O +. s M n
Shows the magnetic permeability of o5F e 240 41. Furthermore, Ba
30ozF6 24 0 4H magnetic permeability and Subinel type N
The permeability of iFe204 is shown as a control.
第７図は六方晶系１３ａ３ Ｃｏ＋．ｓ Ｎｉｏ．ｓＦ
ｅｚ４０＜＋の透磁率を示す。なお、Ｂａ３ＣＯ２Ｆ
ｅ ２４０ ４１の透磁率とスビネル型Ｎ ｉ Ｆ ｅ
２ ０４の透磁率を対照として示す。Figure 7 shows hexagonal system 13a3 Co+. s Nio. sF
Indicates magnetic permeability of ez40<+. In addition, Ba3CO2F
e 240 41 magnetic permeability and Subinel type N i Fe
The permeability of 204 is shown as a control.
第８図はスビネル型ＮｉδＺｎ，−δＦｅ２０４の透磁
率を示す。FIG. 8 shows the magnetic permeability of Subinel type NiδZn, -δFe204.
第９図は六方品系Ｂａ３ＣｏδＺｎｚ−δＦｅ２．Ｏ４
１の透磁率を示す。FIG. 9 shows a hexagonal system Ba3CoδZnz-δFe2. O4
It shows a magnetic permeability of 1.
以上の図から明らかな様に、本発明の六方品系フェライ
トＢａ，Ｇｏｌｔ Ｍｅｚ−ｘ Ｆｅ２４Ｏ４１を使用
したインピーダンス素子は高周波帯域において従来より
も大きいインピーダンスを有する。従って、ノイズフィ
ルタとしても優れた特性を有することが分かる。As is clear from the above figures, the impedance element using the hexagonal ferrite Ba, Golt Mez-x Fe24O41 of the present invention has a larger impedance than the conventional one in the high frequency band. Therefore, it can be seen that it has excellent characteristics as a noise filter.
１ ０
４ × の簡単な言口
第１図は本発明のインピーダンス素子の１例を示す図、
第２図は本発明の他の例によるインピーダンス素子を示
す斜視図、第３図は本発明のさらに他の例によるインピ
ーダンス素子を示す斜視図、第４図は本発明の実施例に
よるインピーダンス素子のインピーダンスの周波数特性
を従来例に比較したグラフ、第５図、第６図及び第７図
は本発明のインピーダンス素子に使用する各種六方品系
フェライトの複素透磁率の周波数特性を従来のフェライ
トと比較したグラフ、第８図は従来のスビネル型フェラ
イトの複素透磁率の周波数特性を示すグラフ、及び第９
図は本発明のインピーダンス素子に使用する六方品系フ
ェライトの複素透磁率の周波数特性を示すグラフである
。Simple expression of 1 0 4 × Fig. 1 is a diagram showing an example of the impedance element of the present invention.
FIG. 2 is a perspective view showing an impedance element according to another example of the present invention, FIG. 3 is a perspective view showing an impedance element according to still another example of the invention, and FIG. 4 is a perspective view of an impedance element according to another example of the invention. Graphs comparing frequency characteristics of impedance with conventional examples, Figures 5, 6, and 7 compare frequency characteristics of complex magnetic permeability of various hexagonal ferrites used in the impedance element of the present invention with conventional ferrites. Graph, Figure 8 is a graph showing the frequency characteristics of complex permeability of conventional Subinel type ferrite, and Figure 9 is a graph showing frequency characteristics of complex permeability of conventional Subinel type ferrite.
The figure is a graph showing the frequency characteristics of complex magnetic permeability of hexagonal ferrite used in the impedance element of the present invention.
１ ｌ 周ジ皮聚辷（ＭＨＺ） １ｏ○ ５００ 因凭数−（ＭＨｚ） １０００1 l Zhou Ji Skin Lifting (MHZ) 1o○ 500 Number of factors - (MHz) 1000
Claims (2)
２面へ貫通する少なくとも１個の貫通孔を有するチップ
状のフェライト素体と、該貫通孔に形成された少なくと
も１本の導体と、前記導体をフェライト素体の表面で直
列に接続する外部導体とよりなるインピーダンス素子に
おいて、前記フェライト素体が六方晶系フェライトＢａ
＿３ＣＯ＿ｘＭｅ＿２＿−＿ｘＦｅ＿２＿４Ｏ＿４＿１
（ここにｘは０．６〜２、ＭｅはＣｕ、Ｎｉ、Ｍｎ、Ｍ
ｇ、Ｚｎより選択される少なくとも一種）より構成され
ていることを特徴とするインピーダンス素子。(1) A chip-shaped ferrite element having at least one through hole penetrating from the first surface of the ferrite element to the opposite second surface, and at least one conductor formed in the through hole. , an impedance element comprising an external conductor connecting the conductor in series on the surface of a ferrite element, wherein the ferrite element is made of hexagonal ferrite Ba.
_3CO_xMe_2_-_xFe_2_4O_4_1
(Here, x is 0.6 to 2, Me is Cu, Ni, Mn, M
1. An impedance element comprising at least one selected from Zn and Zn.
項記載のインピーダンス素子。(2) The first wave is used when the fundamental wave is 500 MHz or higher.
Impedance element described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1300809A JP2794311B2 (en) | 1989-11-21 | 1989-11-21 | Impedance element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1300809A JP2794311B2 (en) | 1989-11-21 | 1989-11-21 | Impedance element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03161910A true JPH03161910A (en) | 1991-07-11 |
| JP2794311B2 JP2794311B2 (en) | 1998-09-03 |
Family
ID=17889364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1300809A Expired - Fee Related JP2794311B2 (en) | 1989-11-21 | 1989-11-21 | Impedance element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2794311B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09310194A (en) * | 1995-12-29 | 1997-12-02 | Lucent Technol Inc | Nickel electroplating for nickel ferritic device |
| US6033593A (en) * | 1997-06-17 | 2000-03-07 | Tdk Corporation | BALUN transformer core material, BALUN transformer core and BALUN transformer |
| US6127296A (en) * | 1998-04-24 | 2000-10-03 | Tdk Corporation | Ceramic-glass composite material and method for the preparation thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5717111A (en) * | 1981-05-22 | 1982-01-28 | Hitachi Metals Ltd | Oxide magnetic material |
| JPH01162312A (en) * | 1987-12-18 | 1989-06-26 | Matsushita Electric Ind Co Ltd | Composite inductance element |
-
1989
- 1989-11-21 JP JP1300809A patent/JP2794311B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5717111A (en) * | 1981-05-22 | 1982-01-28 | Hitachi Metals Ltd | Oxide magnetic material |
| JPH01162312A (en) * | 1987-12-18 | 1989-06-26 | Matsushita Electric Ind Co Ltd | Composite inductance element |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09310194A (en) * | 1995-12-29 | 1997-12-02 | Lucent Technol Inc | Nickel electroplating for nickel ferritic device |
| US6033593A (en) * | 1997-06-17 | 2000-03-07 | Tdk Corporation | BALUN transformer core material, BALUN transformer core and BALUN transformer |
| US6127296A (en) * | 1998-04-24 | 2000-10-03 | Tdk Corporation | Ceramic-glass composite material and method for the preparation thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2794311B2 (en) | 1998-09-03 |
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