KR0155066B1 - Dielectric ceramic composition for high frequency - Google Patents
Dielectric ceramic composition for high frequencyInfo
- Publication number
- KR0155066B1 KR0155066B1 KR1019950029386A KR19950029386A KR0155066B1 KR 0155066 B1 KR0155066 B1 KR 0155066B1 KR 1019950029386 A KR1019950029386 A KR 1019950029386A KR 19950029386 A KR19950029386 A KR 19950029386A KR 0155066 B1 KR0155066 B1 KR 0155066B1
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- KR
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- Prior art keywords
- dielectric
- temperature coefficient
- high frequency
- composition
- ceramic composition
- Prior art date
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
- C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
- C04B35/465—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
Abstract
본 발명은 높은 품질 계수와 유전율을 가지며 공진 주파수의 온도 계수가 안정한 고주파용 유전체 자기 조성물에 관한 것으로서, 이 조성물은 (1-x)CaTiO3-xLaAlO3(0.3x0.8)으로 표시되는 조성식을 갖는다. 본 발명에 의해 제조된 유전체 조성물은 유전율이 25.5 내지 45.2 이고, Qㆍf0(GHz)가 22310 내지 101210이며 공진 주파수의 온도 계수가 9.2 내지 -61.55ppm/℃로서, CaTiO3와 LaAlO3의 조성비를 조절함으로써 공진 주파수의 온도 계수의 조정이 용이하여 고주파 유전체 공진기 소재로 응용이 적합한다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric ceramic composition for high frequency that has a high quality coefficient and dielectric constant and a stable temperature coefficient of resonant frequency, wherein the composition comprises (1-x) CaTiO 3 -xLaAlO 3 (0.3). x 0.8). And a dielectric composition produced by the present invention dielectric constant is 25.5 to 45.2, and Q f 0 (GHz) is 22 310 to 101 210 and a temperature coefficient of 9.2 to -61.55ppm / ℃ of the resonance frequency, the composition ratio of CaTiO 3 and LaAlO 3 It is easy to adjust the temperature coefficient of the resonant frequency by controlling the, so it is suitable for high frequency dielectric resonator material.
Description
본 발명은 높은 품질 계수와 유전율을 가지며 공진 주파수의 온도 계수가 안정한 (1-x)CaTiO3-xLaAlO3계의 고주파용 유전체 자기 조성물에 관한 것이다.The present invention relates to a high frequency dielectric ceramic composition of (1-x) CaTiO 3 -xLaAlO 3 system having high quality coefficient and dielectric constant and stable temperature coefficient of resonance frequency.
최근들어 자동차 전화기, 무선 전화기 또는 위성 방송 등 마이크로파를 이용한 통신 시스템이 급속히 발전하고 있으며, 이들 마이크로파 기기를 구성하는 핵심 부품인 마이크로파 필터와 위성 방송 송수신부의 국부 발진기, 마이크로파 집적 회로기판 등에는 고주파용 유전체 세라믹스가 이용되고 있다. 이러한 통신 시스템에 응용되는 고주파용 유전체로서 요구되는 특성은, (1) 유전체 내에서 파장은 1/에 반비례하므로 부품의 소형화를 위해서는 유전율이 커야 하고, (2) 고주파 영역에서 유전 손실이 작아야 하고, (3) 공진 주파수의 온도 계수가 작아야 한다[W.Wersing : Electronic Ceramics, (B. C. H. Steele 편저) Elsevier Sci. Publ. Co., New York, p. 65(1991) 참고].In recent years, communication systems using microwaves, such as automobile telephones, cordless telephones, or satellite broadcasting, are rapidly developing, and microwave filters, core oscillators, local oscillators of microwave broadcasting transceivers, microwave integrated circuit boards, and the like have high frequency dielectrics. Ceramics are used. Characteristics required for high frequency dielectrics applied to such communication systems include: (1) The wavelength in the dielectric is 1 / As it is inversely proportional to components, the dielectric constant must be large, (2) the dielectric loss must be small in the high frequency region, and (3) the temperature coefficient of the resonant frequency must be small. [W.Wersing: Electronic Ceramics, (BCH Steele) Sci. Publ. Co., New York, p. 65 (1991).
지금까지 개발된 유전체 세라믹스로는, 고유전율계로서 유전율이 80 내지 90인 BaO-PbO-Nd2O3-TiO2계, (Pb, Ca)ZrO3계 등이 있으며, 유전율이 40 정도인 MgTiO3-CaTiO3, Ba(Sn, Mg, Ta)O3, Ba(Zr, Zn, Ta)O3, (Zr, Sn)TiO4계 등이 알려져 있다[Kikuo Wakino, Toshio Nishikawa and Youhei Ishikawa : Br. Ceram. Trans. J., 89(1990) No.2, p.39 참고].Dielectric ceramics developed so far include BaO-PbO-Nd 2 O 3 -TiO 2 type having a dielectric constant of 80 to 90, (Pb, Ca) ZrO 3 type , and the like, and MgTiO having a dielectric constant of about 40. 3 -CaTiO 3 , Ba (Sn, Mg, Ta) O 3 , Ba (Zr, Zn, Ta) O 3 , (Zr, Sn) TiO 4 system and the like are known [Kikuo Wakino, Toshio Nishikawa and Youhei Ishikawa: Br . Ceram. Trans. J., 89 (1990) No. 2, p. 39].
일반적으로, 유전율이 큰 재료는 유전체 내부의 쌍극자의 결함 등으로 인하여 유전 손실과 온도 계수가 증가하게 되어 고주파 유전체로서 3가지 요구 조건, 즉 높은 유전율, 낮은 유전 손실 및 공진 주파수에서의 안정한 온도 계수를 동시에 갖는 조성은 현실적으로 어려운데, 고주파용 유전체는 우선적으로 공진 주파수의 온도 계수가 안정하여야 응용이 가능하다.In general, materials with high dielectric constants have increased dielectric loss and temperature coefficient due to defects in the dipoles in the dielectric, and are high frequency dielectrics, which have stable temperature coefficients at three requirements: high permittivity, low dielectric loss and resonance frequency. At the same time, it is difficult to have a composition, but the dielectric for high frequency is preferentially applied when the temperature coefficient of the resonance frequency is stable.
CaTiO3의 경우, 2GHz에서 유전율이 170 정도로 매우 높으나, 온도 계수가 +800ppm/℃로 매우 불안정하며, LaAlO3는 유전율은 22 정도로 작고, Qㆍf0값이 46000 정도이며, 온도 계수가 -40 내지 -50ppm/℃이다.In the case of CaTiO 3, the dielectric constant at 2GHz very high but so 170, is very unstable in the temperature coefficient of + 800ppm / ℃, LaAlO 3 dielectric constant is as small as 22, the degree of Q and f 0 value is 46000, the temperature coefficient of -40 To -50 ppm / 占 폚.
따라서, 본 발명의 목적은 유전율이 높고, 유전 손실은 작으며, 공진 주파수의 온도 계수가 조절 가능한 유전체 조성물을 제공하는 것으로, 이러한 특성은 공진 주파수의 온도 계수가 불안정하여 실용화할 수 없었던 상기 두 재료를 합성하여 달성되었다.Accordingly, an object of the present invention is to provide a dielectric composition having a high dielectric constant, a low dielectric loss, and having an adjustable temperature coefficient of resonant frequency, which is not practical due to the unstable temperature coefficient of resonant frequency. Was achieved by synthesizing.
본 발명의 목적은 다음과 같은 조성식을 갖는 유전체 자기 조성물을 제공함으로써 달성된다.The object of the present invention is achieved by providing a dielectric ceramic composition having the following compositional formula.
본 발명의 유전체 자기 조성물의 특성은 CaTiO3와 LaAlO3의 조성 변화에 따라 달라진다. LaAlO3의 함량이 증가함에 따라 표 1에서 보는 바와 같이 유전율이 45에서 25로 감소하는 경향을 보이며, Qㆍf0(GHz)는 22310에서 101210로 크게 증가하고, 공진 주파수의 온도 계수(TcF)는 9.2에서 -61.55ppm/℃로 크게 감소한다. 특히 LaAlO3함량이 0.35mol일 때, 유전율은 42 정도이고, Qㆍf0는 31530 정도이며 온도 계수는 5.6ppm/℃ 정도로 ±10 ppm/℃ 이내의 통신 시스템에의 응용에 적합한 유전체 조성물을 얻을 수 있다.Dielectric properties of the ceramic composition of the present invention will vary according to the composition variation of the CaTiO 3 and LaAlO 3. As the content of LaAlO 3 increases, the dielectric constant tends to decrease from 45 to 25 as shown in Table 1, and the Q · f 0 (GHz) increases greatly from 22310 to 101210, and the temperature coefficient of the resonance frequency (TcF) Decreases significantly from 9.2 to -61.55 ppm / ° C. Particularly, when the LaAlO 3 content is 0.35 mol, the dielectric constant is about 42, the Q f 0 is about 31530 and the temperature coefficient is about 5.6 ppm / ° C. to obtain a dielectric composition suitable for application to a communication system within ± 10 ppm / ° C. Can be.
따라서, 상기 조성식에 있어서 x는 0.3X0.8 범위 내에 있는 것이 바람직하다.Therefore, in the composition formula, x is 0.3 X It is preferred to be in the 0.8 range.
이와 같은 본 발명의 유전체 자기 조성물은 당업계에서 일반적으로 널리 사용되는 산화물 혼합 방법으로 용이하게 제조할 수 있다. 이러한 조성물을 제조하기 위한 출발 물질로서는 CaCO3, TiO2, La2O3및 Al2O3를 사용한다. 이 성분들을 목적하는 조성비로 정확히 평량하여 혼합, 분쇄 및 건조시킨다. 혼합이 완료된 분말을 대기 중에서 1400℃에서 4시간 정도 하소한 후 재분쇄하여 페로브스카이트(perovskite) 구조를 갖는 고용체를 합성하고, 이 분말을 1ton/㎠의 압력하에서 12㎜ 원통형 금형을 사용하여 성형하고, 대기 중에서 1600℃의 온도에서 5시간 동안 소결시킴으로써 본 발명에 따른 유전체 자기 조성물을 제조할 수 있다.Such a dielectric ceramic composition of the present invention can be easily produced by an oxide mixing method generally widely used in the art. CaCO 3 , TiO 2 , La 2 O 3 and Al 2 O 3 are used as starting materials for preparing such compositions. These ingredients are precisely weighed to the desired composition ratio, mixed, ground and dried. The mixed powder was calcined in the air at 1400 ° C. for about 4 hours, and then pulverized to synthesize a solid solution having a perovskite structure. The powder was subjected to a 12 mm cylindrical mold under a pressure of 1 ton / cm 2. The dielectric ceramic composition according to the present invention can be prepared by molding and sintering for 5 hours at a temperature of 1600 ° C. in the air.
제조된 소결체의 유전율, Q값 및 공진 주파수의 온도 계수 등의 유전 특성은 당업계에 공지된 통상의 유전체 공진기법으로 측정할 수 있다.Dielectric properties, such as the dielectric constant, Q value and temperature coefficient of the resonance frequency of the manufactured sintered body can be measured by a conventional dielectric resonator technique known in the art.
이하, 본 발명을 다음 실시예로써 더욱 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to the following examples.
[실시예]EXAMPLE
순도 99.9%의 CaCO3, TiO2, La2O3, Al2O3를 하기 표 1에 나타낸 조성비로 평량하고, 지르코니아 볼을 이용하여 혼합, 분쇄 및 건조시켰다. 이 분말을 대기 중에서 1400℃에서 4시간 동안 하소하여 페로브스카이트 구조의 고용체를 합성하였다.CaCO 3 , TiO 2 , La 2 O 3 , Al 2 O 3 having a purity of 99.9% were basis weight in the composition ratios shown in Table 1 below, mixed, pulverized and dried using zirconia balls. The powder was calcined at 1400 ° C. for 4 hours in air to synthesize a solid solution of perovskite structure.
하소된 분말은 분쇄하여 건조시킨 후 1ton/㎠의 압력하에서 원통형 금형(=12㎜)을 이용하여 성형하고, 이것을 대기 중에서 1600℃의 온도에서 5시간 동안 고온 소결하여 시편의 높이/직경의 비가 약 0.4~0.5가 되는 소결 시편을 얻었다. 소결된 시편의 양면을 연마지(#1200까지)와 알루미나 연마제로 연마한 후, 두 평행 도체판 사이에 넣고 7~9 GHz에서 유전율, Q값, 공진 주파수의 온도 계수(TcF)를 측정하였다. 온도 계수는 25℃ 내지 85℃의 온도 범위에서 측정하였다.The calcined powder was pulverized and dried, and then the cylindrical mold under a pressure of 1ton / ㎠ = 12 mm) and sintered at high temperature at 1600 ° C. for 5 hours in the air to obtain a sintered specimen having a height / diameter ratio of about 0.4 to 0.5. Both sides of the sintered specimen were ground with abrasive paper (up to # 1200) and alumina abrasive, and then sandwiched between two parallel conductor plates to measure the temperature coefficient (TcF) of dielectric constant, Q value, and resonance frequency at 7-9 GHz. The temperature coefficient was measured in the temperature range of 25 ° C to 85 ° C.
성분들의 조성 변화에 따른 각 시편의 유전 특성 결과는 다음 표 1과 같다.The dielectric properties of each specimen according to the composition change of the components are shown in Table 1 below.
상기 표 1에서 알 수 있는 바와 같이, 본 발명에 의해 제조된 유전체 자기 조성물은 LaAlO의 함량을 조절함으로써 온도 계수가 안정하며 비교적 높은 Q값을 가지므로 마이크로파 유전체 소자로서 응용이 가능하다.As can be seen in Table 1, the dielectric ceramic composition prepared by the present invention is stable temperature coefficient by controlling the content of LaAlO and has a relatively high Q value can be applied as a microwave dielectric device.
Claims (1)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950029386A KR0155066B1 (en) | 1995-09-07 | 1995-09-07 | Dielectric ceramic composition for high frequency |
| JP8237487A JPH09118562A (en) | 1995-09-07 | 1996-09-09 | Ceramic dielectric for high-frequency wave |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950029386A KR0155066B1 (en) | 1995-09-07 | 1995-09-07 | Dielectric ceramic composition for high frequency |
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| Publication Number | Publication Date |
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| KR970015536A KR970015536A (en) | 1997-04-28 |
| KR0155066B1 true KR0155066B1 (en) | 1998-11-16 |
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| KR1019950029386A KR0155066B1 (en) | 1995-09-07 | 1995-09-07 | Dielectric ceramic composition for high frequency |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100234011B1 (en) * | 1997-08-20 | 1999-12-15 | 박호군 | Dielectric ceramic composition |
| KR100234012B1 (en) * | 1997-08-20 | 1999-12-15 | 박호군 | Dielectric ceramic composition |
| JP4699581B2 (en) * | 1999-10-18 | 2011-06-15 | 日本特殊陶業株式会社 | Microwave dielectric ceramic composition |
| JP4513076B2 (en) * | 1999-10-25 | 2010-07-28 | 株式会社村田製作所 | High frequency dielectric ceramic composition, dielectric resonator, dielectric filter, dielectric duplexer, and communication device |
| JP4839496B2 (en) * | 1999-12-13 | 2011-12-21 | 株式会社村田製作所 | High frequency dielectric ceramic composition, dielectric resonator, dielectric filter, dielectric duplexer, and communication device |
| KR100707578B1 (en) | 2000-11-20 | 2007-04-13 | 니혼도꾸슈도교 가부시키가이샤 | Microwave dielectric porcelain composition and dielectric resonator |
| KR100752019B1 (en) | 2006-09-29 | 2007-08-28 | 삼성전기주식회사 | Insulating material for printed circuit board |
| JP5349146B2 (en) * | 2009-06-08 | 2013-11-20 | 京セラ株式会社 | Dielectric ceramics and dielectric resonator |
| RU2643381C1 (en) * | 2016-12-23 | 2018-02-01 | Публичное акционерное общество "Радиофизика" | Method of manufacturing of two-cavity monoblock casing of bandpass filter |
| CN111634930A (en) * | 2020-06-23 | 2020-09-08 | 山东国瓷功能材料股份有限公司 | Low-dielectric-constant hollow aluminum oxide material for high-frequency application and preparation method thereof |
| CN115611625A (en) * | 2022-11-15 | 2023-01-17 | 南京国睿微波器件有限公司 | Magnesium titanate-based microwave dielectric ceramic and preparation process thereof |
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1995
- 1995-09-07 KR KR1019950029386A patent/KR0155066B1/en not_active IP Right Cessation
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1996
- 1996-09-09 JP JP8237487A patent/JPH09118562A/en active Pending
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| KR970015536A (en) | 1997-04-28 |
| JPH09118562A (en) | 1997-05-06 |
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