JPH0742165B2 - Microwave dielectric ceramics - Google Patents
Microwave dielectric ceramicsInfo
- Publication number
- JPH0742165B2 JPH0742165B2 JP1206566A JP20656689A JPH0742165B2 JP H0742165 B2 JPH0742165 B2 JP H0742165B2 JP 1206566 A JP1206566 A JP 1206566A JP 20656689 A JP20656689 A JP 20656689A JP H0742165 B2 JPH0742165 B2 JP H0742165B2
- Authority
- JP
- Japan
- Prior art keywords
- composition
- microwave dielectric
- dielectric ceramics
- oxide
- tio
- 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.)
- Expired - Lifetime
Links
- 239000000919 ceramic Substances 0.000 title claims description 23
- 239000000203 mixture Substances 0.000 claims description 22
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims description 16
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 8
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 8
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 7
- 229910017493 Nd 2 O 3 Inorganic materials 0.000 claims description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910000416 bismuth oxide Inorganic materials 0.000 claims description 2
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims description 2
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 2
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 claims description 2
- FKTOIHSPIPYAPE-UHFFFAOYSA-N samarium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[Sm+3].[Sm+3] FKTOIHSPIPYAPE-UHFFFAOYSA-N 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229910052573 porcelain Inorganic materials 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- -1 Sm 2 O 3 Inorganic materials 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Insulating Materials (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、マイクロ波誘電体セラミックス、特にその
比誘電率εｒおよび無負荷Ｑが大きくかつ組成を変化さ
せることにより零を中心にして正まはた負の任意の温度
係数τｆが得られるマイクロ波誘電体セラミックス組成
物に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to microwave dielectric ceramics, in particular, their relative permittivity ε r and unloaded Q are large and the composition is changed so that the positive dielectric constant is around zero. In addition, the present invention relates to a microwave dielectric ceramic composition capable of obtaining an arbitrary negative temperature coefficient τ f .
（従来の技術） 一般に、温度保償用セラミックス（磁器）コンデンサや
マイクロ波回路用の誘電体共振器等では誘電体セラミッ
クス（磁器）組成物として比誘電率εｒおよび無負荷Q:
Qu（＝1/tanδ）が大きく、共振周波数の温度係数τｆ
としては、０を中心にして正または負の任意の温度係数
が得られることが必要とされている。従来、かかる誘電
体セラミックス組成物としてBaO・TiO2系、MgTiO3・CaO
系、ZrO2・SnO2・TiO2系、BaO・TiO2・Sm2O3・La2O3系
などの組成物を使用していた（例えば特公昭61-14606号
公報参照）。(Prior Art) Generally, in a ceramic (porcelain) for temperature compensation, a dielectric resonator for microwave circuits, etc., a dielectric ceramic (porcelain) composition has a relative permittivity ε r and an unloaded Q:
Q u (= 1 / tan δ) is large, and the temperature coefficient of resonance frequency τ f
It is necessary to obtain an arbitrary positive or negative temperature coefficient centered on 0. Conventionally, as such dielectric ceramic composition, BaO ・ TiO 2 system, MgTiO 3・ CaO
A composition such as a system, a ZrO 2 · SnO 2 · TiO 2 system, a BaO · TiO 2 · Sm 2 O 3 · La 2 O 3 system was used (see, for example, Japanese Patent Publication No. 61-14606).
（発明が解決しようとする課題） しかしながら、これら従来の誘電体セラミックス組成物
を用いて誘電体共振器コンデンサを製造した場合、その
温度係数τｆが０（ppm/℃）付近では比誘電率εｒが60
〜80であり、このような比誘電率の値は、誘電体共振器
等の小形化を図る上で小さくて不十分であるという問題
点があった。(Problems to be Solved by the Invention) However, when a dielectric resonator capacitor is manufactured by using these conventional dielectric ceramic compositions, the relative dielectric constant ε near a temperature coefficient τ f of 0 (ppm / ° C.). r is 60
There is a problem that such a value of the relative permittivity is small and insufficient in order to miniaturize the dielectric resonator and the like.
この発明は、上述した従来の問題点に鑑みなされたもの
であって、従って、この発明の目的は、温度係数が０
（ppm/℃）付近においても比誘電率εｒおよび無負荷Ｑ
が大きいマイクロ波誘電体セラミックスを提供するもの
である。The present invention has been made in view of the above-mentioned conventional problems. Therefore, the object of the present invention is to achieve a temperature coefficient of 0.
Relative permittivity ε r and no load Q near (ppm / ℃)
A microwave dielectric ceramic having a large size is provided.
（課題を解決するための手段） この発明の達成を図るため、この発明のマイクロ波誘電
体セラミックスによれば、酸化バリウム（BaO）、二酸
化チタン（TiO2）、酸化サマリウム（Sm2O3）、酸化ラ
ンタン（La2O3）、酸化ネオジウム（Nd2O3）および酸化
ビスマス（Bi2O3）からなるセラミックス組成物で構成
し、その組成式を X BaO・Y TiO2 ・Z{(Sm2O3)1-W1-W2(La2O3)W1(Nd2O3)W2}・V Bi2O3と表
わし、成分組成X,Y,Z,Vをモル％で 11.5≦Ｘ≦21.0 60.0≦Ｙ≦76.0 6.5≦Ｚ≦26.0 0.1≦Ｖ≦5.0 Ｘ＋Ｙ＋Ｚ＋Ｖ＝100 （但し、W1，W2，（１−W1−W2）をモル比としたとき０
＜W1＜1,0＜W2＜1,0＜（１−W1−W2）＜１である。） の範囲としたことを特徴とする。(Means for Solving the Problems) In order to achieve the present invention, according to the microwave dielectric ceramics of the present invention, barium oxide (BaO), titanium dioxide (TiO 2 ), samarium oxide (Sm 2 O 3 ) , A lanthanum oxide (La 2 O 3 ), neodymium oxide (Nd 2 O 3 ) and bismuth oxide (Bi 2 O 3 ) ceramic composition, the composition formula of which is X BaO · Y TiO 2 · Z {( Sm 2 O 3 ) 1-W1-W2 (La 2 O 3 ) W1 (Nd 2 O 3 ) W2 } ・ V Bi 2 O 3 , the composition of components X, Y, Z, V is 11.5 ≦ X in mol% ≤21.0 60.0 ≤Y ≤76.0 6.5 ≤Z ≤26.0 0.1 ≤V ≤5.0 X + Y + Z + V = 100 (where W 1 , W 2 and (1-W 1 -W 2 ) are the molar ratios 0
<W 1 <1,0 <W 2 <1,0 <(1-W 1 -W 2) < 1. ).
さらに、この発明のマイクロ波誘電体セラミックスによ
れば、上述したセラミックス組成物を構成するBaO、TiO
2、Sm2O3、La2O3、Nd2O3およびBi2O3からなる主成分に
対し、副成分として、MnO2を２重量％以下添加したこと
を特徴とする。Furthermore, according to the microwave dielectric ceramics of the present invention, BaO, TiO constituting the above-mentioned ceramic composition is formed.
It is characterized in that 2% by weight or less of MnO 2 is added as a subcomponent to the main component consisting of 2 , Sm 2 O 3 , La 2 O 3 , Nd 2 O 3 and Bi 2 O 3 .
（作用） この発明の上述した構成によれば、マイクロ波誘電体セ
ラミックス組成物の各組成成分の組成範囲を上述した所
定範囲内に特定してあるので、後述する実験結果からも
明らかなように、上述した温度係数τｆが０（ppm/℃）
付近でも比誘電率εｒおよび無負荷Ｑが大きく、しか
も、組成を変化させることにより零を中心にして正また
は負の任意の温度係数τｆを得ることが出来る。(Operation) According to the above-described configuration of the present invention, the composition range of each composition component of the microwave dielectric ceramics composition is specified within the above-described predetermined range, and as will be apparent from the experimental results described below. , The above temperature coefficient τ f is 0 (ppm / ° C)
Even in the vicinity, the relative permittivity ε r and the unloaded Q are large, and by changing the composition, it is possible to obtain an arbitrary positive or negative temperature coefficient τ f with zero as the center.
（実施例） 以下、この発明のマイクロ波誘電体セラミックスの実施
例につき説明する。(Examples) Examples of the microwave dielectric ceramics of the present invention will be described below.
出発原料として化学的に高純度のBaCO3、TiO2、Sm2O3、
La2O3、Nd2O3およびBi2O3を別表１および別表２に示す
組成比率にてポットミルを用いて純水とともに20〜24時
間混合した。この混合物を脱水および乾燥させた後、得
られた混合粉を高純度のアルミナ匣で1060℃で２時間仮
焼した。得られた仮焼物をポットミルで純水とともに粉
砕し、脱水乾燥後、バインダを添加して造粒した後、32
メッシュのふるいを通して整粒（分級）した。得られた
造粒粉体を、金型を用いて油圧プレスで、成形圧力１〜
3ton/cm2で、成形して直径16mm,厚さ9mmの円板状の成形
体を得た。次に、得られた成形体を高純度のアルミナ匣
に入れ、1250℃〜1450℃の温度範囲の適切な温度で２時
間焼成し、誘電体セラミックスを得た。Chemically high purity BaCO 3 , TiO 2 , Sm 2 O 3 , as starting materials,
La 2 O 3 , Nd 2 O 3 and Bi 2 O 3 were mixed with pure water for 20 to 24 hours using a pot mill at the composition ratios shown in Tables 1 and 2. After this mixture was dehydrated and dried, the obtained mixed powder was calcined in a high-purity alumina box at 1060 ° C. for 2 hours. The obtained calcined product was crushed with pure water in a pot mill, dehydrated and dried, and then a binder was added to granulate it.
The particles were sized (classified) through a mesh sieve. The obtained granulated powder is pressed by a hydraulic press using a mold to a molding pressure of 1 to
Molding was performed at 3 ton / cm 2 to obtain a disk-shaped molded body having a diameter of 16 mm and a thickness of 9 mm. Next, the obtained molded body was put into a high-purity alumina box and fired at an appropriate temperature in the temperature range of 1250 ° C to 1450 ° C for 2 hours to obtain a dielectric ceramic.
得られた誘電体セラミックスについてハッキ・コールマ
ン法により比誘電率εｒおよびQuを測定した。また、共
振周波数の温度係数τｆを、下記（１）式に従って20℃
の共振周波数を基準にして‐40℃〜＋85℃の温度範囲に
おける値から求め、これらの実験結果を別表１に示し
た。尚、これらの測定における共振周波数は３〜4GHzで
あった。The relative dielectric constants ε r and Q u of the obtained dielectric ceramics were measured by the Hacky-Coleman method. In addition, the temperature coefficient τ f of the resonance frequency is 20 ° C according to the following equation (1).
The results of these experiments are shown in Appendix 1 from the values in the temperature range of −40 ° C. to + 85 ° C. with reference to the resonance frequency of. The resonance frequency in these measurements was 3 to 4 GHz.
但し、ｆ（20℃）＝20℃における共振周波数 ｆ（85℃）＝85℃における共振周波数 ｆ（‐40℃）＝‐40℃における共振周波数 ΔT:測定温度差、ここでは85−（‐40）＝125℃ 別表１および別表２において＊印を付した試料番号のも
のは、この発明の範囲外の比較例であり、それ以外の試
料がこの発明の範囲内の実施例である。 However, f (20 ℃) = resonance frequency at 20 ℃ f (85 ℃) ＝ resonance frequency at 85 ℃ f (-40 ℃) ＝ resonance frequency at -40 ℃ ΔT: measurement temperature difference, 85-(-40 ) = 125 ° C. Sample numbers marked with * in Appendix 1 and Appendix 2 are comparative examples outside the scope of the present invention, and other samples are Examples within the scope of the present invention.
別表１の実験結果によれば、BaOが11.5モル％未満並び
に21.0モル％越えるか、TiO2が60.0モル％未満ならびに
76.0モル％を越えると無負荷Ｑ（Qu）が小さくなり温度
係数τｆも大きくなり不適当となる。また、希土類酸化
物（Sm2O3，La2O3，Nd2O3）の量Ｚが6.5モル％より小さ
いか、26.0モル％より大きくなると比誘電率εｒおよび
無負荷Ｑ（Qu）が小さくなり温度係数τｆは大きくなり
負適当である。According to the experimental results in Appendix 1, BaO is less than 11.5 mol% and more than 21.0 mol%, or TiO 2 is less than 60.0 mol% and
If it exceeds 76.0 mol%, the unloaded Q (Q u ) becomes small and the temperature coefficient τ f becomes large, which is unsuitable. When the amount Z of rare earth oxides (Sm 2 O 3 , La 2 O 3 , Nd 2 O 3 ) is less than 6.5 mol% or more than 26.0 mol%, the relative permittivity ε r and the unloaded Q (Q u ) Becomes small, and the temperature coefficient τ f becomes large, which is negative.
また、BiO2O3量が増加するにつれて比誘電率εｒと無負
荷Ｑ（Qu）は向上するがBiO2O3量が５モル％を越えると
無負荷Ｑ（Qu）が低下し不適当となる。さらに、W1(La2
O3)またはW2(Nd2O3)または（１−W1−W2）（Sm2O3）の
モル比が零のときは、無負荷Ｑ（Qu）が小さいか、温度
係数τｆが大きくなり不適当となる。従って、上述した
組成範囲はこの発明から除外する。Also, as the BiO 2 O 3 content increases, the relative permittivity ε r and the unloaded Q (Q u ) improve, but when the BiO 2 O 3 content exceeds 5 mol%, the unloaded Q (Q u ) decreases. Becomes inappropriate. In addition, W 1 (La 2
O 3) or W 2 (the Nd 2 O 3) or (1-W 1 -W 2) (Sm 2 when the molar ratio of O 3) is zero, or no-load Q (Q u) is small, the temperature coefficient τ f becomes large and unsuitable. Therefore, the above composition ranges are excluded from the present invention.
よって、この発明では、これらの組成範囲は実用的にみ
てモル％で 11.5≦Ｘ≦21.0 60.0≦Ｙ≦76.0 6.5≦Ｚ≦26.0 0.1≦Ｖ≦5.0 Ｘ＋Ｙ＋Ｚ＋Ｖ＝100 （但し、モル比を、それぞれ、０＜W1＜1,0＜W2＜1,0＜
（１−W1−W2）＜１とする。）の範囲とするのがマイク
ロ波誘電体セラミックスとして適当である。Therefore, in the present invention, these compositional ranges are practically 1% ≦ X ≦ 21.0 60.0 ≦ Y ≦ 76.0 6.5 ≦ Z ≦ 26.0 0.1 ≦ V ≦ 5.0 X + Y + Z + V = 100 (however, the molar ratios are 0 <W 1 <1,0 <W 2 <1,0 <
(1−W 1 −W 2 ) <1. It is suitable for the microwave dielectric ceramics to be in the range of).
次に、BaO,TiO2，Sm2O3，La2O3，Nd2O3およびBi2O3から
なる主成分に対しMnO2を副成分として含有する誘電体セ
ラミックスに対する測定結果を別表２に比較例とともに
示す。別表２において＊印を付した試料番号のものは比
較例を示しそれ以外の試料番号のものが実施例である。Next, Table 2 shows the measurement results for the dielectric ceramics containing MnO 2 as a sub-component with respect to the main component consisting of BaO, TiO 2 , Sm 2 O 3 , La 2 O 3 , Nd 2 O 3 and Bi 2 O 3. Is shown together with a comparative example. In Table 2, the sample numbers marked with * are comparative examples, and the other sample numbers are examples.
MnO2の添加量の増加につれ無負荷Ｑ（Qu）を大きくする
ことができる。また共振周波数の温度係数τｆをコント
ロールすることができる。また、この誘電体セラミック
ス組成物の焼結性も向上した。The unloaded Q (Q u ) can be increased as the amount of MnO 2 added increases. Further, the temperature coefficient τ f of the resonance frequency can be controlled. Also, the sinterability of this dielectric ceramic composition was improved.
しかしながら、MnO2の添加量が２重量％を越えるとする
と無負荷Ｑ（Qu）が低下し、しかも、誘電体セラミック
ス組成物の焼結性も悪くなり不適当である。However, if the added amount of MnO 2 exceeds 2% by weight, the unloaded Q (Q u ) is lowered and, moreover, the sinterability of the dielectric ceramic composition is deteriorated, which is not suitable.
従って、２重量％を越えるMnO2の添加量はこの発明の範
囲から除外する。Therefore, the amount of MnO 2 added exceeding 2% by weight is excluded from the scope of the present invention.
従って、この発明ではMnO2の添加量を２重量％以下とす
るのが好適である。Therefore, in the present invention, it is preferable that the added amount of MnO 2 be 2% by weight or less.
（発明の効果） 上述した説明からも明らかなように、このマイクロ波領
域において比誘電率εｒおよび無負荷Ｑ（Qu）が大き
く、さらに組成を変化させることによって広範囲に共振
周波数の温度係数τｆを変化させることができる。(Effect of the Invention) As is clear from the above description, the relative permittivity ε r and the unloaded Q (Q u ) are large in this microwave region, and the temperature coefficient of the resonance frequency can be widely varied by changing the composition. τ f can be changed.
従ってマイクロ波誘電体共振器あるいは温度保償用コン
デンサ等の誘電体セラミックス（磁器）として利用する
ことができる。Therefore, it can be used as a dielectric ceramic (porcelain) such as a microwave dielectric resonator or a temperature compensation capacitor.
Claims (2)
2）、酸化サマリウム（Sm2O3）、酸化ランタン（La
2O3）、酸化ネオジウム（Nd2O3）および酸化ビスマス
（Bi2O3）からなる誘電体セラミックス組成物であっ
て、組成式を X BaO・Y TiO2 ・Z{(Sm2O3)1-W1-W2(La2O3)W1(Nd2O3)W2}・V Bi2O3と表
わし、成分組成X,Y,Z,Vをモル％で 11.5≦Ｘ≦21.0 60.0≦Ｙ≦76.0 6.5≦Ｚ≦26.0 0.1≦Ｖ≦5.0 Ｘ＋Ｙ＋Ｚ＋Ｖ＝100 （但し、W1，W2および（１−W1−W2）はそれぞれモル比
を表わし、かつ、０＜W1＜1,0＜W2＜1,0＜（１−W1−
W2）＜１である。） の範囲としたことを 特徴とするマイクロ波誘電体セラミックス。1. Barium oxide (BaO), titanium dioxide (TiO 2)
2 ), samarium oxide (Sm 2 O 3 ), lanthanum oxide (La
2 O 3 ), neodymium oxide (Nd 2 O 3 ) and bismuth oxide (Bi 2 O 3 ), the composition formula of which is X BaO · Y TiO 2 · Z {(Sm 2 O 3 ) 1-W1-W2 (La 2 O 3 ) W1 (Nd 2 O 3 ) W2 } ・ V Bi 2 O 3 , the component composition X, Y, Z, V in mol% is 11.5 ≦ X ≦ 21.0 60.0 ≦ Y ≦ 76.0 6.5 ≦ Z ≦ 26.0 0.1 ≦ V ≦ 5.0 X + Y + Z + V = 100 (where W 1 , W 2 and (1-W 1 -W 2 ) each represent a molar ratio, and 0 <W 1 <1, 0 <W 2 <1,0 <(1-W 1 −
W 2 ) <1. ) The microwave dielectric ceramics characterized in that
れていることを 特徴とする請求項１に記載のマイクロ波誘電体セラミッ
クス。2. The microwave dielectric ceramics according to claim 1, wherein 2% by weight or less of MnO 2 is added as an auxiliary component.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1206566A JPH0742165B2 (en) | 1989-08-09 | 1989-08-09 | Microwave dielectric ceramics |
| DE90114869T DE69004374T2 (en) | 1989-08-09 | 1990-08-02 | Dielectric ceramic for use in the field of microwaves. |
| EP90114869A EP0412440B1 (en) | 1989-08-09 | 1990-08-02 | Dielectric ceramic for microwave applications |
| US07/563,556 US5077247A (en) | 1989-08-09 | 1990-08-06 | Dielectric ceramic for microwave applications |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1206566A JPH0742165B2 (en) | 1989-08-09 | 1989-08-09 | Microwave dielectric ceramics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0369560A JPH0369560A (en) | 1991-03-25 |
| JPH0742165B2 true JPH0742165B2 (en) | 1995-05-10 |
Family
ID=16525516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1206566A Expired - Lifetime JPH0742165B2 (en) | 1989-08-09 | 1989-08-09 | Microwave dielectric ceramics |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0742165B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999062839A1 (en) * | 1998-06-04 | 1999-12-09 | Sumitomo Special Metals Co., Ltd. | Microwave dielectric ceramic composition |
| KR100315566B1 (en) * | 1999-09-09 | 2001-11-30 | 이계안 | Seat belt load limitor of automatic using plastic deformation |
| KR100487070B1 (en) * | 2002-12-03 | 2005-05-03 | (주)씨아이제이 | Microwave dielectric ceramic composition |
| CN115784740B (en) * | 2022-11-29 | 2023-11-21 | 南京以太通信技术有限公司 | High-dielectric-constant microwave dielectric ceramic material and preparation method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57156367A (en) * | 1981-03-23 | 1982-09-27 | Tdk Electronics Co Ltd | Dielectric ceramic composition |
| JPS6115531A (en) * | 1984-07-02 | 1986-01-23 | 東京電力株式会社 | Stability calculator |
-
1989
- 1989-08-09 JP JP1206566A patent/JPH0742165B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0369560A (en) | 1991-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0568802B2 (en) | ||
| JPS6118283B2 (en) | ||
| JP2974829B2 (en) | Microwave dielectric porcelain composition | |
| US5432135A (en) | Dielectric ceramic composition for high frequency | |
| JPH0742165B2 (en) | Microwave dielectric ceramics | |
| JP2501649B2 (en) | Microwave dielectric ceramics | |
| EP0727789A1 (en) | Dielectric procelain composition and its manufacture | |
| JP2554478B2 (en) | Microwave dielectric porcelain composition | |
| JP3696947B2 (en) | Dielectric porcelain composition | |
| JP2685984B2 (en) | Dielectric ceramics for microwave | |
| JP2514354B2 (en) | Dielectric ceramic composition and method for producing the same | |
| JPH0765627A (en) | Dielectric ceramic for microwave | |
| JPH0571538B2 (en) | ||
| JPH0415963B2 (en) | ||
| JP2842756B2 (en) | High frequency dielectric ceramic composition | |
| JPH0785363B2 (en) | Microwave dielectric ceramics | |
| JPH0669904B2 (en) | Dielectric porcelain | |
| JPH0334164B2 (en) | ||
| JPH05298922A (en) | Dielectric ceramic for microwave | |
| KR100298209B1 (en) | Microwave dielectric ceramics and compositions for dielectric ceramics thereof | |
| JPH06275126A (en) | Dielectric porcelain composition | |
| JPH0334163B2 (en) | ||
| JPH0567589B2 (en) | ||
| KR960004394B1 (en) | Dielectric Ceramic Composition for Microwave | |
| JPH06102572B2 (en) | High frequency dielectric ceramic composition |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100510 Year of fee payment: 15 |