JPH0765627A - Dielectric ceramic for microwave - Google Patents
Dielectric ceramic for microwaveInfo
- Publication number
- JPH0765627A JPH0765627A JP5210138A JP21013893A JPH0765627A JP H0765627 A JPH0765627 A JP H0765627A JP 5210138 A JP5210138 A JP 5210138A JP 21013893 A JP21013893 A JP 21013893A JP H0765627 A JPH0765627 A JP H0765627A
- Authority
- JP
- Japan
- Prior art keywords
- oxide
- microwave
- dielectric
- dielectric ceramic
- present
- 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.)
- Withdrawn
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 21
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims abstract description 8
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910001928 zirconium oxide Inorganic materials 0.000 claims abstract description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 4
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 4
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims abstract 2
- 239000000203 mixture Substances 0.000 claims description 12
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims 1
- 239000000292 calcium oxide Substances 0.000 claims 1
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 abstract 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 229910010413 TiO 2 Inorganic materials 0.000 description 3
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 3
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 description 1
- 229910017493 Nd 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
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Insulating Materials (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、マイクロ波用誘電体
セラミックス、特にその比誘電率（εr ）および無負荷
Ｑ（Ｑu ）が大きくかつ組成を変化させることにより共
振周波数の温度係数（τf ）を０ｐｐｍ／℃を中心にし
て正または負の任意の値に変化させ得るマイクロ波用誘
電体セラミックスに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric ceramic for microwaves, in particular, its relative permittivity (ε r ) and unloaded Q (Q u ) are large and the temperature coefficient of the resonance frequency ( The present invention relates to a dielectric ceramic for microwaves capable of changing τ f ) to an arbitrary positive or negative value centered on 0 ppm / ° C.
【０００２】[0002]
【従来の技術】近年、マイクロ波用の誘電体共振器や誘
電体フィルタが、自動車電話、携帯電話、衛星放送の受
信機等に数多く用いられている。このような用途に用い
られる誘電体セラミックスとしては、比誘電率（εr ）
および無負荷Ｑ（Ｑu ）が大きく、かつ、その組成を変
えることによって共振周波数の温度係数（τf ）が０ｐ
ｐｍ／℃を中心にして正または負の任意の値に設定でき
るものが望まれている。2. Description of the Related Art In recent years, a large number of microwave dielectric resonators and filters have been used in automobile telephones, mobile telephones, satellite broadcast receivers and the like. Dielectric ceramics used for such applications have a relative permittivity (ε r )
And the unloaded Q (Q u ) is large, and the temperature coefficient (τ f ) of the resonance frequency is 0 p by changing the composition.
What can be set to any positive or negative value around pm / ° C is desired.
【０００３】従来、このような誘電体セラミックスとし
て、ＢａＯ−ＴｉＯ2 系のもの、さらに、たとえば特公
昭５５−３４５３５号公報若しくは同５５−３４５２６
号公報に開示されているようなＺｒＯ2 −ＳｎＯ2 −Ｔ
ｉＯ2 系のもの、さらに、たとえばこの出願の出願人に
かかる特開昭５９−２３０２０６号公報に開示されてい
るようなＢａＯ−ＴｉＯ2 −Ｓｍ2 Ｏ3 −Ｌａ2 Ｏ3 系
のもの、さらに、たとえばこの出願の出願人にかかる特
開平３−８０１５０号公報に開示されているようなＢａ
Ｏ−ＴｉＯ2 −Ｎｄ2 Ｏ3 −Ｓｍ2 Ｏ3 −Ｌａ2 Ｏ3 系
のものなどがあった。Conventionally, as such a dielectric ceramic, a BaO--TiO 2 system, and further, for example, Japanese Patent Publication No. 55-34535 or 55-34526.
ZrO 2 --SnO 2 --T as disclosed in the publication
iO 2 -based ones, for example BaO—TiO 2 —Sm 2 O 3 —La 2 O 3 -based ones such as those disclosed in Japanese Patent Application Laid-Open No. 59-230206 of the applicant of the present application, and , Ba as disclosed, for example, in Japanese Patent Application Laid-Open No. 3-80150 of the applicant of this application.
There was an O—TiO 2 —Nd 2 O 3 —Sm 2 O 3 —La 2 O 3 system.
【０００４】[0004]
【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を用いて誘電体共振器、誘電
体フィルタを作製した場合、温度係数が０（ｐｐｍ／
℃）付近では比誘電率（εr ）は高いものでも６０〜９
０程度であり、誘電体共振器等の小形化を図る上で十分
大きいとはいえず不十分であるという問題点があった。
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／℃）付近において比誘電率（εr ）および無
負荷Ｑ（Ｑu ）が従来より大きいマイクロ波用誘電体セ
ラミックスを提供することにある。However, when a dielectric resonator and a dielectric filter are manufactured using these conventional dielectric ceramics, the temperature coefficient is 0 (ppm /
Even if the relative permittivity (ε r ) is high in the vicinity of ℃), it is 60 to 9
Since it is about 0, it is not sufficiently large and inadequate for downsizing the dielectric resonator and the like.
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.
An object of the present invention is to provide a dielectric ceramic for microwaves having a relative permittivity (ε r ) and a no-load Q (Q u ) near (ppm / ° C.), which are higher than conventional ones.
【０００５】[0005]
【課題を解決するための手段】この目的の達成を図るた
め、この発明のマイクロ波用誘電体セラミックスによれ
ば、酸化鉛（ＰｂＯ）、酸化カルシウム（ＣａＯ）、酸
化ジルコニウム（ＺｒＯ2 ）、酸化セリウム（Ｃｅ
Ｏ2 ）および酸化マンガン（ＭｎＯ2 ）から成り、主成
分の組成式を Ｘ（ＣａW Ｐｂ1-W ）Ｏ＋Ｙ（ＺｒＯ2 ）＋ＺＣｅＯ2 と表わしたとき、Ｘ、Ｙ、Ｚをモル％で ４７≦Ｘ≦５５ ４４．８≦Ｙ≦５３ ０＜Ｚ≦１ Ｘ＋Ｙ＋Ｚ＝１００ の範囲としてあり、Ｗをモル比で ０．２５＜Ｗ≦０．４５ の範囲としてあり、この主成分に対しＭｎＯ2 を２重量
％以下添加したことを特徴とする。In order to achieve this object, according to the dielectric ceramic for microwaves of the present invention, lead oxide (PbO), calcium oxide (CaO), zirconium oxide (ZrO 2 ), oxidation Cerium (Ce
O 2 ) and manganese oxide (MnO 2 ), and the composition formula of the main component is expressed as X (Ca W Pb 1-W ) O + Y (ZrO 2 ) + ZCeO 2 , X, Y, and Z are expressed in mol%. ≦ X ≦ 55 44.8 ≦ Y ≦ 53 0 <Z ≦ 1 X + Y + Z = 100, and W in a molar ratio of 0.25 <W ≦ 0.45. MnO 2 is added to this main component. 2% by weight or less is added.
【０００６】[0006]
【作用】この発明の構成によれば、マイクロ波用誘電体
セラミックス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、
温度係数τf が０（ｐｐｍ／℃）付近でも比誘電率（ε
r ）および無負荷Ｑ（Ｑu ）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 を示すセラミックスが得られる。According to the structure of the present invention, since the composition range of the dielectric ceramics for microwaves is specified within the above-mentioned predetermined range, as will be apparent from the experimental results described later,
Even if the temperature coefficient τ f is near 0 (ppm / ° C), the relative permittivity (ε
r ) and unloaded Q (Q u ) are large, and by changing the composition, a ceramic having an arbitrary positive or negative temperature coefficient τ f centered on zero can be obtained.
【０００７】[0007]
【実施例】以下、この発明のマイクロ波用誘電体セラミ
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.
【０００８】出発原料として化学的に高純度のＣａＣＯ
3 、ＰｂＯ、ＺｒＯ2 、ＣｅＯ2 およびＭｎＣＯ3 を表
１に示す組成になるよう秤量し、それらをポットミルを
用いて純水とジルコニアボールと共に２４時間混合し
た。この混合物を脱水、乾燥させた後得られた混合粉を
高純度のアルミナ匣を用いて９００℃の温度で２時間仮
焼した。得られた仮焼物をポットミルで純水とジルコニ
アボールと共に２４時間粉砕した。この粉砕物を脱水、
乾燥した後これにバインダを添加して造粒した後、３２
メッシュの篩を通して整粒した。得られた造粒粉体を、
金型と油圧プレスとを用いて、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、１２００℃〜１４００℃の温度範囲で２時
間焼成し、誘電体セラミックスを得た。得られ各組成の
誘電体セラミックスについて、ハッキ・コ−ルマン法に
よりそれぞれの比誘電率（εr ）および無負荷Ｑ
（Ｑu ）をそれぞれ測定した。また、共振周波数の温度
係数（τf ）を、下記（１）式に従って、２０℃におけ
る共振周波数ｆ（２０）を基準とし、−４０℃と＋８０
℃の温度におけるそれぞれの共振周波数ｆ（−４０）、
ｆ（８０）と温度差ΔＴ（ここではΔＴ＝８０−（−４
０）＝１２０）からそれぞれ求めた。Chemically high purity CaCO as a starting material
3 , PbO, ZrO 2 , CeO 2 and MnCO 3 were weighed so as to have the composition shown in Table 1, and they were mixed with pure water and zirconia balls for 24 hours using a pot mill. This mixture was dehydrated and dried, and the obtained mixed powder was calcined at a temperature of 900 ° C. for 2 hours using a high-purity alumina box. The obtained calcined product was pulverized in a pot mill together with pure water and zirconia balls for 24 hours. Dehydration of this crushed product,
After drying and granulating by adding a binder, 32
The particles were sieved through a mesh sieve. The obtained granulated powder,
Molding pressure of 1-3 ton / using a die and hydraulic press
A disc-shaped molded body having a diameter of 16 mm and a thickness of 9 mm was obtained by molding with a cm 2 . Next, the obtained molded body was put into a high purity alumina box and fired in a temperature range of 1200 ° C. to 1400 ° C. for 2 hours to obtain a dielectric ceramic. With respect to the obtained dielectric ceramics of each composition, the relative permittivity (ε r ) and the unloaded Q were measured by the Hacky-Kolman method.
(Q u ) was measured. Further, the temperature coefficient (τ f ) of the resonance frequency is −40 ° C. and +80 with reference to the resonance frequency f (20) at 20 ° C. according to the following equation (1).
Resonant frequency f (-40) at a temperature of ℃,
f (80) and temperature difference ΔT (here, ΔT = 80 − (− 4
0) = 120).
【０００９】 τf ＝｛ｆ（８０）−ｆ（−４０）｝／｛ｆ（２０）×１２０｝・・（１） 各組成の誘電体セラミックスの誘電特性の測定結果を表
１に示す。本測定における共振周波数は３〜５ＧＨZ で
あった。なお、表１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。Τ f = {f (80) −f (−40)} / {f (20) × 120} ··· (1) Table 1 shows the measurement results of the dielectric properties of the dielectric ceramics of each composition. Resonance frequency of the measurement was 3~5GH Z. In Table 1, the sample numbers marked with * are comparative examples outside the scope of the present invention, and the other samples are examples within the scope of the present invention.
【００１０】表１の実験結果によれば、Ｘ即ち（ＣａW
Ｐｂ1-W ）Ｏのモル％が４７未満あるいはＹ即ちＺｒＯ
2 のモル％が５３を超える場合（試料Ｎｏ．２０）、及
び、Ｘ即ち（ＣａW Ｐｂ1-W ）Ｏのモル％が５５を超え
るかあるいはＹ即ちＺｒＯ2のモル％が４４．８未満の
場合（試料Ｎｏ．２１）は、無負荷Ｑ（Ｑu ）及び比誘
電率（εr ）が小さくなるので本発明の目的に不適当な
ことが分かる。さらに、Ｚ即ちＣｅＯ2 のモル％が１．
０を超える場合（試料Ｎｏ．１１）あるいは０の場合
（試料Ｎｏ．７）は、無負荷Ｑ（Ｑu ）が小さくなるの
で本発明の目的に不適当なことが分かる。また、Ｗ即ち
Ｃａのモル比が０．２５以下の場合（試料Ｎｏ．１）は
温度係数（τf ）が正に大きくなり、Ｗが０．４５を超
える場合（試料Ｎｏ．６）は温度係数（τf ）が負に大
きくなると共に比誘電率（εr ）が５０以下と小さくな
るので、本発明の目的に不適当なことが分かる。また、
Ｍｎは、それを少量添加すると焼結性を改善でき無負荷
Ｑ（Ｑu ）を向上させ得ることが分かるが、その添加量
がＯの場合（試料Ｎｏ．１２）及び２重量％を超える場
合（試料Ｎｏ．１７）は、無負荷Ｑ（Ｑu ）が５００以
下と小さくなるので、本発明の目的に不適当であること
が分かる。従って、上述した組成範囲はこの発明から除
外する。よって、酸化鉛（ＰｂＯ）、酸化カルシウム
（ＣａＯ）、酸化ジルコニウム（ＺｒＯ2 ）、酸化セリ
ウム（ＣｅＯ2 ）および酸化マンガン（ＭｎＯ2 ）から
成るマイクロ波用誘電体セラミックスを構成する際、主
成分の組成式を Ｘ（ＣａW Ｐｂ1-W ）Ｏ＋Ｙ（ＺｒＯ2 ）＋ＺＣｅＯ2 と表わしたとき、Ｘ、Ｙ、Ｚをモル％で ４７≦Ｘ≦５５ ４４．８≦Ｙ≦５３ ０＜Ｚ≦１ Ｘ＋Ｙ＋Ｚ＝１００ の範囲とし、Ｗをモル比で ０．２５＜Ｗ≦０．４５ の範囲とし、この主成分に対しＭｎＯ2 を２重量％以下
添加すると、比誘電率（εr ）、無負荷Ｑ（Ｑu ）が大
きく、温度係数（τf ）が±１００ｐｐｍ／℃の範囲内
の値を示すセラミックスが得られることが分かる。According to the experimental results shown in Table 1, X or (Ca W
Pb 1-W ) O mol% is less than 47 or Y, that is, ZrO
When the mol% of 2 exceeds 53 (Sample No. 20), and the mol% of X or (Ca W Pb 1 -W ) O exceeds 55, or the mol% of Y or ZrO 2 is less than 44.8. In the case of No. 21 (Sample No. 21), the unloaded Q (Q u ) and the relative dielectric constant (ε r ) are small, and therefore it is found to be unsuitable for the purpose of the present invention. In addition, Z or CeO 2 mol% is 1.
In the case of exceeding 0 (Sample No. 11) or 0 (Sample No. 7), the no-load Q (Q u ) becomes small, and it is understood that this is not suitable for the purpose of the present invention. When the W or Ca molar ratio is 0.25 or less (Sample No. 1), the temperature coefficient (τ f ) becomes positively large, and when W exceeds 0.45 (Sample No. 6), the temperature is increased. Since the coefficient (τ f ) increases negatively and the relative permittivity (ε r ) decreases to 50 or less, it can be seen that this is not suitable for the purpose of the present invention. Also,
It can be seen that when a small amount of Mn is added, the sinterability can be improved and the unloaded Q (Q u ) can be improved. However, when the added amount is O (Sample No. 12) and exceeds 2% by weight. It can be seen that (Sample No. 17) is unsuitable for the purpose of the present invention because the unloaded Q (Q u ) is as small as 500 or less. Therefore, the above composition ranges are excluded from the present invention. Therefore, when the microwave dielectric ceramics composed of lead oxide (PbO), calcium oxide (CaO), zirconium oxide (ZrO 2 ), cerium oxide (CeO 2 ) and manganese oxide (MnO 2 ) is used, When the composition formula is expressed as X (Ca W Pb 1-W ) O + Y (ZrO 2 ) + ZCeO 2 , 47 ≦ X ≦ 55 44.8 ≦ Y ≦ 53 0 <Z ≦ 1 in terms of X, Y and Z in mol%. When X + Y + Z = 100 and the molar ratio of W is in the range of 0.25 <W ≦ 0.45, and MnO 2 is added in an amount of 2 wt% or less to this main component, the relative permittivity (ε r ) and no load are applied. It can be seen that a ceramic having a large Q (Q u ) and a temperature coefficient (τ f ) within a range of ± 100 ppm / ° C. can be obtained.
【００１１】[0011]
【発明の効果】上述した説明からも明らかなように、こ
の発明のマイクロ波用誘電体セラミックスは、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を変化させ得るも
のである。従ってマイクロ波領域において使用される誘
電体共振器、誘電体フィルタの小型化に有効である。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。As is apparent from the above description, the dielectric ceramics for microwaves according to the present invention has a relative permittivity (ε r ) and no load Q in the microwave region.
(Q u ) is large, and the temperature coefficient τ f of the resonance frequency can be changed over a wide range by changing the composition. Therefore, it is effective for miniaturization of the dielectric resonator and the dielectric filter used in the microwave region. Alternatively, it can be used as a dielectric ceramic (porcelain) such as a temperature compensation capacitor.
【００１２】[0012]
【表１】 [Table 1]
Claims (1)
ａＯ）、酸化ジルコニウム（ＺｒＯ2 ）、酸化セリウム
（ＣｅＯ2 ）および酸化マンガン（ＭｎＯ2）から成
り、主成分の組成式を Ｘ（ＣａW Ｐｂ1-W ）Ｏ＋Ｙ（ＺｒＯ2 ）＋ＺＣｅＯ2 と表わしたとき、Ｘ、Ｙ、Ｚをモル％で ４７≦Ｘ≦５５ ４４．８≦Ｙ≦５３ ０＜Ｚ≦１ Ｘ＋Ｙ＋Ｚ＝１００ の範囲としてあり、Ｗをモル比で ０．２５＜Ｗ≦０．４５ の範囲としてあり、この主成分に対しＭｎＯ2 を２重量
％以下添加したことを特徴とするマイクロ波用誘電体セ
ラミックス。1. Lead oxide (PbO), calcium oxide (C
aO), zirconium oxide (ZrO 2 ), cerium oxide (CeO 2 ) and manganese oxide (MnO 2 ), the composition formula of the main component is expressed as X (Ca W Pb 1-W ) O + Y (ZrO 2 ) + ZCeO 2. In this case, X, Y, and Z are in mol% in the range of 47 ≦ X ≦ 55 44.8 ≦ Y ≦ 53 0 <Z ≦ 1 X + Y + Z = 100, and W is in a molar ratio of 0.25 <W ≦ 0. The dielectric ceramics for microwave is characterized in that the content of MnO 2 is 2 wt% or less with respect to the main component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5210138A JPH0765627A (en) | 1993-08-25 | 1993-08-25 | Dielectric ceramic for microwave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5210138A JPH0765627A (en) | 1993-08-25 | 1993-08-25 | Dielectric ceramic for microwave |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0765627A true JPH0765627A (en) | 1995-03-10 |
Family
ID=16584414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5210138A Withdrawn JPH0765627A (en) | 1993-08-25 | 1993-08-25 | Dielectric ceramic for microwave |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0765627A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105924151A (en) * | 2016-04-20 | 2016-09-07 | 苏州艾福电子通讯股份有限公司 | Microwave dielectric ceramic powder and method thereof, microwave dielectric ceramic, microwave component |
| CN111517779A (en) * | 2019-02-03 | 2020-08-11 | 苏州艾福电子通讯股份有限公司 | Improved microwave dielectric ceramic powder and preparation method and application thereof |
-
1993
- 1993-08-25 JP JP5210138A patent/JPH0765627A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105924151A (en) * | 2016-04-20 | 2016-09-07 | 苏州艾福电子通讯股份有限公司 | Microwave dielectric ceramic powder and method thereof, microwave dielectric ceramic, microwave component |
| CN111517779A (en) * | 2019-02-03 | 2020-08-11 | 苏州艾福电子通讯股份有限公司 | Improved microwave dielectric ceramic powder and preparation method and application thereof |
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| Date | Code | Title | Description |
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| A300 | Withdrawal of application because of no request for examination |
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