KR100349006B1 - A dielectric material for microwave - Google Patents
A dielectric material for microwave Download PDFInfo
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- KR100349006B1 KR100349006B1 KR1020000034406A KR20000034406A KR100349006B1 KR 100349006 B1 KR100349006 B1 KR 100349006B1 KR 1020000034406 A KR1020000034406 A KR 1020000034406A KR 20000034406 A KR20000034406 A KR 20000034406A KR 100349006 B1 KR100349006 B1 KR 100349006B1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
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- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
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- H01G4/12—Ceramic dielectrics
- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
- H01G4/1218—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates
- H01G4/1227—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates based on alkaline earth titanates
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Abstract
본 발명은 40이상의 유전율을 갖고, 품질계수(Q)가 높으며, 공진주파수의 온도계수를 일정한 범위내에서 제어할 수 있는 마이크로파용 유전체 재료에 관한 것으로서, 특히 CaTiO3, Al2O3, Ca2Nb2O7계 유전체 재료에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric material for microwaves having a dielectric constant of 40 or more, having a high quality factor (Q), and capable of controlling the temperature coefficient of the resonance frequency within a certain range, in particular, CaTiO 3 , Al 2 O 3 , Ca 2 A Nb 2 O 7 based dielectric material.
본 발명의 유전체 재료는 다음의 화학식을 만족하는 것을 특징으로 한다.The dielectric material of the present invention is characterized by satisfying the following formula.
(1-x-y)CaTiO3-x(Al2O3)-y(Ca2Nb207)(1-xy) CaTiO 3 -x (Al 2 O 3 ) -y (Ca 2 Nb 2 0 7 )
여기서, 0.2 ≤x ≤0.4, 0.5 ≤y ≤0.7이다.Here, 0.2 ≦ x ≦ 0.4 and 0.5 ≦ y ≦ 0.7.
Description
본 발명은 40 ~ 50의 유전율을 갖고, 품질계수(Q)가 높으며, 공진주파수의 온도계수를 일정한 범위내에서 제어할 수 있는 마이크로파용 유전체 재료에 관한 것으로서, 특히 CaTiO3, Al2O3, Ca2Nb2O7계 유전체 재료에 관한 것이다.The present invention relates to a dielectric material for microwaves having a dielectric constant of 40 to 50, high quality factor (Q), and capable of controlling a temperature coefficient of resonant frequency within a certain range, in particular, CaTiO 3 , Al 2 O 3 , A Ca 2 Nb 2 O 7 based dielectric material.
최근 셀룰러, PCS, WLL(Wireless local loop), IMT 2000 등의 이동통신 및위성방송 등에 마이크로파(주파수 대역; 300MHz ~ 30GHz)를 이용한 통신시스템이 현저하게 발전하고 있으며, 이들 시스템을 구성하는 공진기소자, 대역통과(또는 저지)필터 및 마이크로파 집적회로(MIC; Microwave Integrated Circuit) 등에 마이크로파용 유전체 세라믹스의 응용이 크게 증대되고 있다.Recently, communication systems using microwaves (frequency band; 300 MHz to 30 GHz) for cellular communication, satellite broadcasting such as cellular, PCS, wireless local loop (WLL) and IMT 2000 have been remarkably developed, and resonator elements constituting these systems, BACKGROUND Applications of microwave dielectric ceramics for band pass (or stop) filters and microwave integrated circuits (MICs) has been greatly increased.
마이크로파를 이용한 통신시스템에 사용되는 고주파용 유전체는High frequency dielectrics used in microwave communication systems
1) 유전체내에서 마이크로파의 파장은 유전율의 1/2승에 반비례하므로 부품의 소형화를 위해서는 유전율이 커야하며,1) Since the wavelength of microwaves in the dielectric is inversely proportional to the half power of the dielectric constant, the dielectric constant must be large for the miniaturization of components.
2) 유전손실은 주파수에 비례하여 증가되므로 고 성능화를 위해서는 Q값(유전손실의 역수)이 높아야 하고,2) Dielectric loss increases in proportion to frequency, so the Q value (inverse of the dielectric loss) should be high for high performance.
3) 유전체 공진기의 공진주파수의 온도계수가 작아야 하며,3) The temperature coefficient of the resonance frequency of the dielectric resonator should be small,
부수적으로, 경시변화가 작고, 열전도율이 크며, 기계적 강도가 높은 것이 요구된다.Incidentally, it is required to have a small change over time, a high thermal conductivity and a high mechanical strength.
지금까지 알려진 대표적인 마이크로파용 유전체 재료 및 그 특성은 다음과 같다.Representative microwave dielectric materials and properties thereof known so far are as follows.
가) 유전율; 20 ~ 30, Qㆍf=100,000 ~ 150,000 GHz인 Ba(Mg1/3Ta2/3)O3, Ba(Zn1/3Ta2/3)O3[참고자료: K. Matsumoto, T.Hiuga, K.Takada and H. Ichimura, Proceedings of 6th IEEE Interational Symposium on Applications of Ferroelectrics, pp118-121, 1986]A) permittivity; Ba (Mg 1/3 Ta 2/3 ) O 3 , Ba (Zn 1/3 Ta 2/3 ) O 3 with 20 to 30, Q · f = 100,000 to 150,000 GHz [Reference: K. Matsumoto, T. Hiuga, K. Takada and H. Ichimura, Proceedings of 6th IEEE Interational Symposium on Applications of Ferroelectrics, pp118-121, 1986].
나) 유전율; 30 ~ 40, Qㆍf=40,000 ~ 50,000 GHz인 (Zn, Sn)TiO4, Ba2Ti9O20[참고자료: J. Am. Ceram. Soc. 67(4), p278 ~ 281, 1983]B) permittivity; (Zn, Sn) TiO 4 , Ba 2 Ti 9 O 20 with 30 to 40, Q · f = 40,000 to 50,000 GHz [Reference: J. Am. Ceram. Soc. 67 (4), p278-281, 1983]
다) 유전율; 85 ~ 95, Qㆍf=40,000 ~ 50,000 GHz인 (Ba, Pb)O-Nd203-TiO2, BaO-(Nd, Bi)203-TiO2[참고자료: 일본특허 평3-290359, 일본특허 소56-102113]C) permittivity; (Ba, Pb) O-Nd 2 0 3 -TiO 2 , BaO- (Nd, Bi) 2 0 3- TiO 2 with 85 to 95, Qf = 40,000 to 50,000 GHz 290359, Japanese Patent No. 56-102113]
라) 유전율; 100, Qㆍf=30,000 ~ 40,000 GHz인 (Pb, Ca)ZrO3[참고자료: J. Kato. JJAP, Vol. 30, No. 9B, p. 2343 ~ 2346, 1991]D) permittivity; (Pb, Ca) ZrO 3 with 100, Q · f = 30,000 to 40,000 GHz [Reference: J. Kato. JJAP, Vol. 30, no. 9B, p. 2343-2346, 1991]
마) 유전율; 110, Qㆍf=3,000 GHz인 CaTiO3-(Li1/2Nd1/2)TiO3[참고자료: US Patent No 5,401,702]E) permittivity; CaTiO 3 — (Li 1/2 Nd 1/2 ) TiO 3 with 110, Q · f = 3,000 GHz [Reference: US Patent No 5,401,702]
바) 유전율; 123, Qㆍf=4,150 GHz, Tf=10.8ppm/℃인 CaO : SrO : Li2O : Sm2O3: Nd2O3: TiO2= 15 : 1 : 9 : 6 : 6 : 63인 유전체 세라믹 [참고자료: I. Takahashi, Y. Baba, K. Ezaki, and K. Shibata, JJAP. Vol. 35(9), p5069 ~ 5037, 1992]F) permittivity; 123, Q · f = 4,150 GHz, Tf = 10.8 ppm / ° C CaO: SrO: Li 2 O: Sm 2 O 3 : Nd 2 O 3 : TiO 2 = 15: 1: 9: 6: 6: 63 Ceramics [References: I. Takahashi, Y. Baba, K. Ezaki, and K. Shibata, JJAP. Vol. 35 (9), p5069-5037, 1992]
이동통신 단말기에 사용되는 공진기, 필터, 듀플렉서 등은 유전체 세라믹으로 제조된다. 이때, 이들 세라믹 부품들의 크기는 사용되는 유전체 세라믹의 유전율 크기에 반비례한다. 따라서, 이동통신 단말기의 소형화를 위해서는 유전율이 큰 유전체 조성물이 요구된다. 그러나, 일반적으로 고주파 유전체 재료로서 유전율이 클 수록 품질계수(Qㆍf) 값이 작거나, 공진주파수 온도계수(Tf)가 크기 때문에 높은 유전상수와 품질계수 그리고 안정된 온도계수 등 3가지 유전특성을 모두 만족시키는 고주파 유전체를 제조하기가 어렵다.Resonators, filters, duplexers and the like used in mobile communication terminals are made of dielectric ceramic. The size of these ceramic components is then inversely proportional to the dielectric constant of the dielectric ceramic used. Therefore, in order to miniaturize a mobile communication terminal, a dielectric composition having a high dielectric constant is required. However, in general, the higher the dielectric constant, the higher the dielectric constant (Q · f) or the higher the resonant frequency temperature coefficient (Tf). Therefore, the three dielectric characteristics are high dielectric constant, quality coefficient, and stable temperature coefficient. It is difficult to produce a high frequency dielectric that satisfies all.
대한민국 등록특허공보 특0162874호에는 온도계수가 10ppm/℃인 조성부근에서 유전율이 48이상이며, 유전손실이 적고, 공진주파수의 온도계수를 0ppm/℃를 중심으로 +와 -쪽으로 필요에 따라 손쉽게 이동시킬 수 있는 CaTiO3-La(Zn1/2Ti1/2)O3-LaAlO3계 마이크로파용 유전체 재료를 개시하고 있다. 이 마이크로파용 유전체 재료는 일반식 (1-x)CaTiO3-x[(1-y)La(Zn1/2Ti1/2)O3-yLaAlO3]으로 표시되는 조성계에서 0.3≤x≤0.6 및 0≤y≤1.0를 만족하는 것을 특징으로 한다.Korean Patent Publication No. 0162874 has a dielectric constant of 48 or more in the vicinity of a composition having a temperature coefficient of 10ppm / ℃, has a low dielectric loss, and can easily move the temperature coefficient of the resonance frequency toward + and-centers around 0ppm / ℃ as needed. A dielectric material for a CaTiO 3 -La (Zn 1/2 Ti 1/2 ) O 3 -LaAlO 3 based microwave which can be disclosed is disclosed. This microwave dielectric material is 0.3 ≦ x ≦ 0.6 in the composition system represented by the general formula (1-x) CaTiO 3 -x [(1-y) La (Zn 1/2 Ti 1/2 ) O 3 -yLaAlO 3 ]. And 0 ≦ y ≦ 1.0.
또한, 대한민국 등록특허공보 특0162875호에는 유전율이 40이상이며, 유전손실이 적고, 공진주파수의 온도계수를 0ppm/℃를 중심으로 +와 -쪽으로 필요에 따라 손쉽게 이동시킬 수 있는 일반식 (1-x)CaTiO3-x[(1-y)La(Mg1/2Ti1/2)O3-yLaAlO3]으로 표시되는 조성계에서 0.3≤x≤0.6 및 0≤y≤1.0를 만족하는 마이크로파용 유전체 재료가 개시되어 있다.In addition, the Republic of Korea Patent Publication No. 0162875 has a dielectric constant of 40 or more, less dielectric loss, and can easily move the temperature coefficient of the resonant frequency to + and-as needed around 0ppm / ℃ (1- for microwaves satisfying 0.3≤x≤0.6 and 0≤y≤1.0 in the composition system represented by x) CaTiO 3 -x [(1-y) La (Mg 1/2 Ti 1/2 ) O 3 -yLaAlO 3 ] Dielectric materials are disclosed.
그러나, 상술한 종래기술중 어느것도 본 발명과 같은 Al2O3, CaTiO3, Ca2Nb2O7계 마이크로파용 유전체 재료를 개시하고 있지는 않다.However, none of the above-mentioned prior arts discloses Al 2 O 3 , CaTiO 3 , Ca 2 Nb 2 O 7 -based dielectric materials as in the present invention.
본 발명은 40 ~ 50의 유전율을 갖고, 품질계수가 높으며, 공진주파수의 온도계수를 일정한 범위내에서 제어할 수 있는 Al2O3, CaTiO3, Ca2Nb2O7계 마이크로파용 유전체 재료를 제공하는 것을 그 목적으로 한다.The present invention provides a dielectric material for Al 2 O 3 , CaTiO 3 , Ca 2 Nb 2 O 7 based microwave materials having a dielectric constant of 40 to 50, high quality coefficient, and capable of controlling the temperature coefficient of the resonance frequency within a predetermined range. Its purpose is to provide.
일반적으로, 유전율이 큰 재료는 유전체 내부의 쌍극자, 결함 등으로 인하여품질계수(Q)가 낮아지고, 공진주파수의 온도계수가 증가하는 경향이 있다.In general, a material having a high dielectric constant tends to have a low quality factor Q due to dipoles, defects, and the like in the dielectric, and increase the temperature coefficient of the resonance frequency.
CaTiO3의 경우 800MHz 대역 이상에서 약 170 ~ 180 정도의 높은 유전율을 나타내지만, 공진주파수의 온도계수가 +800ppm/℃로 매우 높아서 마이크로파용 유전체 재료로는 적합하지 않다.CaTiO 3 has a high dielectric constant of about 170 to 180 over the 800 MHz band, but the temperature coefficient of the resonance frequency is very high as +800 ppm / 占 폚, which is not suitable for microwave dielectric materials.
따라서, 본 발명은 높은 유전율을 갖는 CaTiO3를 상대적으로 매우 낮은 유전율(9 ~ 10)을 갖지만, 높은 품질계수(100,000 이상) 및 공진주파수의 온도계수가 -55ppm/℃인 Al2O3와 유전율:33, 품질계수:2,500~3,000, 공진주파수의 온도계수가 -150ppm/℃인 Ca2Nb2O7를 고용시켜 유전율 40이상, 높은 품질계수(50,000이상), 공진주파수의 온도계수를 -10ppm/℃ ~ +10ppm/℃사이에서 용이하게 제어할 수 있는 새로운 마이크로파용 유전체 재료를 제공한다.Thus, the present invention has a relatively low dielectric constant (9 to 10) of CaTiO 3 having a high dielectric constant, but has a high quality coefficient (100,000 or more) and Al 2 O 3 and a dielectric constant of -55 ppm / ° C. 33, Quality coefficient: 2,500 ~ 3,000, Ca 2 Nb 2 O 7 with a resonant frequency of -150ppm / ℃ is employed, so that the dielectric constant of 40 or higher, high quality coefficient (50,000 or more) and resonant frequency of -10ppm / ℃ Provides a new microwave dielectric material that can be easily controlled between ~ 10 ppm / ° C.
본 발명의 유전체 재료는 다음의 화학식 1을 만족하는 것을 특징으로 한다.The dielectric material of the present invention is characterized by satisfying the following formula (1).
여기서, 0.2 ≤x ≤0.4, 0.5 ≤y ≤0.7이다.Here, 0.2 ≦ x ≦ 0.4 and 0.5 ≦ y ≦ 0.7.
즉, 본 발명의 유전체 재료는 Al2O3와 CaTiO3및 Ca2Nb2O7가 각기 도 1의 빗금친 영역내의 조성범위로 결합하게 된다.That is, in the dielectric material of the present invention, Al 2 O 3 and CaTiO 3 and Ca 2 Nb 2 O 7 are combined in the composition range in the hatched region of FIG. 1, respectively.
본 발명의 유전체 재료는 Al2O3와 CaTiO3및 Ca2Nb2O7의 조성비에 따라 그 특성이 달라진다.The dielectric material of the present invention varies depending on the composition ratio of Al 2 O 3 , CaTiO 3, and Ca 2 Nb 2 O 7 .
또한, 상기 화학식 1의 x값과 y값이 증가하여 Al2O3및 Ca2Nb2O7의 함량이 증가함에 따라 유전율은 45에서 40으로 감소하는 경향을 나타내고(도 2 참조), 품질계수는 56,000 정도에서 53,000 정도로 감소하며(도 3 참조), 공진주파수의 온도계수는 +에서 -로 변화된다.(도 4 참조)In addition, the dielectric constant decreases from 45 to 40 as the content of Al 2 O 3 and Ca 2 Nb 2 O 7 increases as the x value and y value of Formula 1 increase (see FIG. 2), and the quality factor Decreases from 56,000 to 53,000 (see FIG. 3), and the temperature coefficient of the resonant frequency is changed from + to-(see FIG. 4).
따라서, (1-x-y)CaTiO3-x(Al2O3)-y(Ca2Nb207)(여기서, 0.2 ≤x ≤0.4, 0.5 ≤y ≤0.7이다)에서 x값과 y값을 조절하는 것에 의해 유전손실이 작고, 유전율이 40 ~ 45이고, 공진주파수의 온도계수가 ±10ppm/℃이내인 우수한 특성을 갖는 마이크로파 유전체 재료를 제조할 수 있다.Therefore, x value and y value at (1-xy) CaTiO 3 -x (Al 2 O 3 ) -y (Ca 2 Nb 2 0 7 ), where 0.2 ≦ x ≦ 0.4 and 0.5 ≦ y ≦ 0.7 By adjusting, it is possible to produce a microwave dielectric material having excellent characteristics with a low dielectric loss, a dielectric constant of 40 to 45, and a temperature coefficient of resonant frequency within ± 10 ppm / 占 폚.
본 발명의 다른 목적 및 장점들은 하기에 설명될 것이며, 본 발명의 실시에 의해 알게 될 것이다. 또한, 본 발명의 목적 및 장점들은 첨부된 특허청구범위에 나타낸 수단 및 조합에 의해 실현될 수 있다.Other objects and advantages of the invention will be described below and will be appreciated by the practice of the invention. Furthermore, the objects and advantages of the present invention can be realized by means and combinations indicated in the appended claims.
도 1은 본 발명의 유전체 재료의 조성범위를 보인 CaTiO3, Al2O3, Ca2Nb2O73원계도.1 is a CaTiO 3 , Al 2 O 3 , Ca 2 Nb 2 O 7 ternary diagram showing the composition range of the dielectric material of the present invention.
도 2는 본 발명에 의한 유전체 재료의 조성변화에 따른 유전율 특성을 나타내는 그래프.2 is a graph showing the dielectric constant characteristics according to the composition change of the dielectric material according to the present invention.
도 3은 본 발명에 의한 유전체 재료의 조성변화에 따른 품질계수 특성을 나타내는 그래프.3 is a graph showing the quality coefficient characteristics according to the composition change of the dielectric material according to the present invention.
도 4는 본 발명에 의한 유전체 재료의 조성변화에 따른 공진주파수의 온도계수 특성을 나타내는 그래프.Figure 4 is a graph showing the temperature coefficient characteristics of the resonance frequency according to the composition change of the dielectric material according to the present invention.
실시예Example
일본 고순도 화학연구소의 CaCO3(99.9%), Nb2O5(99.9%)를 각각 상기 화학식 1의 조성비가 되도록 정확히 평량한 후, 알코올과 지르코니아볼을 매체로 하여 16시간 습식 혼합 및 분쇄하여 건조시킨다. 이렇게 건조된 혼합분말을 1200℃에서 6시간 동안 하소하여 Ca2Nb2O7분말을 제조한다.CaCO 3 (99.9%) and Nb 2 O 5 (99.9%) from the Japan Institute of High Purity Chemistry were weighed exactly to the composition ratio of Formula 1, respectively, and then wet mixed and pulverized with alcohol and zirconia ball for 16 hours to dry. Let's do it. The dried mixed powder was calcined at 1200 ° C. for 6 hours to prepare Ca 2 Nb 2 O 7 powder.
이렇게 제조된 Ca2Nb2O7분말과, 일본 고순도 화학연구소의 CaTiO3(99.9%) 및Al2O3(99.9%)를 아래의 표 1에 나타낸 조성비가 되도록 평량한 후 16시간 동안 습식 혼합 및 분쇄하여 건조시킨다. 이렇게 건조된 혼합분말을 1200℃에서 6시간 동안 하소하여 CaTiO3-Al2O3-Ca2Nb2O7분말을 제조한다.The Ca 2 Nb 2 O 7 powder thus prepared and CaTiO 3 (99.9%) and Al 2 O 3 (99.9%) of the Japan High Purity Chemical Research Institute were weighed to a composition ratio shown in Table 1 below, and then wet mixed for 16 hours. And pulverized and dried. The dried mixed powder was calcined at 1200 ° C. for 6 hours to prepare CaTiO 3 -Al 2 O 3 -Ca 2 Nb 2 O 7 powder.
이렇게 하소된 분말을 24시간 동안 습식 혼합 및 분쇄하고, 이때, 원활한 성형을 위하여 PVA 205 10wt%, 수용액 5wt%, 올레인산 0.5wt%을 동시에 첨가한다.The calcined powder was wet mixed and ground for 24 hours, at which time 10 wt% PVA 205, 5 wt% aqueous solution, and 0.5 wt% oleic acid were simultaneously added for smooth molding.
분쇄된 분말을 건조시켜 체거름한 후 직경이 12mm인 SKD-11 금형에서 약 1ton/Cm3의 압력으로 가압하여 두께가 5 ~ 6mm 정도인 시편을 성형한다.The pulverized powder is dried, sieved and pressurized at a pressure of about 1 ton / cm 3 in a 12 mm diameter SKD-11 mold to form a specimen having a thickness of about 5 to 6 mm.
성형된 시편을 실험용 전기로에서 1450 ~ 1500℃의 온도로 소결한다. 이때, 유기성분의 원활한 휘발을 위하여 600℃에서 1 ~ 2시간 유지시켜 주었으며, 충분한 입자성장이 일어나게 하기 위하여 1450 ~ 1500℃에서 12시간, 냉각속도를 3℃/분으로 설정한다.The molded specimen is sintered at a temperature of 1450-1500 ° C. in an experimental electric furnace. At this time, it was maintained for 1 to 2 hours at 600 ℃ for the smooth volatilization of the organic components, 12 hours at 1450 ~ 1500 ℃ to set the sufficient particle growth, the cooling rate is set to 3 ℃ / min.
유전율 및 품질계수(Q)의 측정은 TE11공진모드를 이용한 Hakki-Coleman 방법을 이용하여 측정하였으며, -30℃, +25℃, +70℃에서 2시간 유지후의 공진주파수 변화를 측정하여 공진주파수의 온도계수를 계산하였다.The dielectric constant and quality factor (Q) were measured using the Hakki-Coleman method using TE 11 resonance mode. The resonance frequency was measured by measuring the change in the resonance frequency after 2 hours at -30 ℃, + 25 ℃ and + 70 ℃. The temperature coefficient of was calculated.
이렇게 해서 측정한 각 조성별 시편의 마이크로파 유전특성을 표 1에 나타낸다.Table 1 shows the microwave dielectric properties of the specimens for each composition.
상기 표 1로부터 알 수 있는 바와같이, CaTiO3를 Al2O3및 Ca2Nb2O7와 적절한 조성비로 고용시키는 것에 의해 유전율 40 이상, 높은 품질계수(50,000 이상), 공진주파수의 온도계수를 -10ppm/℃ ~ +10ppm/℃ 사이에서 용이하게 제어할 수 있는 마이크로파용 유전체 세라믹 조성물을 제조할 수 있다.As can be seen from Table 1, CaTiO 3 is dissolved in Al 2 O 3 and Ca 2 Nb 2 O 7 at an appropriate composition ratio to obtain a dielectric constant of 40 or more, a high quality coefficient (50,000 or more), and a temperature coefficient of resonance frequency. A dielectric ceramic composition for microwaves that can be easily controlled between -10 ppm / ° C and +10 ppm / ° C can be prepared.
본 발명의 유전체 재료는 40이상의 유전율을 갖고, 품질계수(Q)가 높으며, 공진주파수의 온도계수를 일정한 범위내에서 용이하게 제어하는 것이 가능하다.The dielectric material of the present invention has a dielectric constant of 40 or more, high quality factor (Q), and it is possible to easily control the temperature coefficient of the resonance frequency within a certain range.
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| JPH06107457A (en) * | 1992-09-24 | 1994-04-19 | Ngk Spark Plug Co Ltd | Microwave dielectric porcelain composition |
| JPH06199567A (en) * | 1992-12-30 | 1994-07-19 | Ngk Spark Plug Co Ltd | Microwave dielectric porcelain composition |
| KR100234017B1 (en) * | 1997-12-24 | 1999-12-15 | 박호군 | Dielectric ceramic composition |
| JP2000109363A (en) * | 1998-10-02 | 2000-04-18 | Toko Inc | Dielectric porcelain composition |
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| JPH06107457A (en) * | 1992-09-24 | 1994-04-19 | Ngk Spark Plug Co Ltd | Microwave dielectric porcelain composition |
| JPH06199567A (en) * | 1992-12-30 | 1994-07-19 | Ngk Spark Plug Co Ltd | Microwave dielectric porcelain composition |
| KR100234017B1 (en) * | 1997-12-24 | 1999-12-15 | 박호군 | Dielectric ceramic composition |
| JP2000109363A (en) * | 1998-10-02 | 2000-04-18 | Toko Inc | Dielectric porcelain composition |
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