• 한국진공학회지
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• 제19권5호
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• pp.347-352
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• 2010

SiOC 박막의 유전상수를 서로 다른 2가지 방법을 사용하여 계산하고 그 차이점에 대하여 비교분석하였다. SiOC 박막의 유전장수는 전형적인 유전상수 측정법으로써 MIS 구조를 이용하여 C-V 측정법에 의하여 얻을 수 있으며, 또한 엘립소미터를 이용한 굴절률로부터 $n^2$을 구하는 방법이 있다. SiOC 박막의 유전상수는 쌍극자, 이온, 전자의 성분으로 이루어지며, 댁개 쌍극자 성분은 무시된다. 박막을 증착하는 동안 플라즈마에 의한 프리커서의 해리로부터 이온결합이 생성되면서 증착된다. 증착한 박막의 유전상수는 주로 이온결합 효과가 주를 이루었다. 열처리를 하면서 OH 수산기의 기화에 의해 유전상수는 감소되는데 이때 이온의 효과도 더불어 감소하게 된다. 상대적으로 무시되었던 전자에 의한 분극의 효과가 나타나면서 유전상수는 더욱 감소하였다. 하지만 물리 화학적 그리고 전기적으로 안정된 SiOC 박막은 이온과 전자에 의한 분극의 효과가 없어지는 무 분극성의 박막으로서 유전상수는 열처리한 박막에서 2.0 정도인 것으로 측정되었다.

• E2M - 전기 전자와 첨단 소재
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• 제8권4호
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• pp.413-417
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• 1995

In order to elucidate the electrical and mechanical properties of insulating paper, it is desirable to study the performances of tensile strength, dielectric constant, dielectric strength. In this work, we constructed the characteristics depending on change of fabrication condition, and these specimens were manufactured by hot press method. As a result, tensile strength was about 75MPa and breakdown was above 5 kV/mm at the minimum value.

• Transactions on Electrical and Electronic Materials
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• 제18권6호
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• pp.338-340
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• 2017

Breakdown of solid insulating materials in power equipment could result in undesired outages and replacements, and may be due to an increase in electric stress on the material. Therefore, it is necessary to conduct a proper diagnosis of materials before their practical use. In this work, a few inherent properties of different non-cellulosic insulating materials, such as Nomex, Teflon, laminated Nomex, glass bonded mica, epoxy resin bonded mica paper, and epoxy resin bonded fiberglass, have been evaluated by performing non-destructive dielectric diagnostic measurements, and an attempt has been made to correlate these basic parameters to evaluate the breakdown strength (BDS). An equation has been proposed using a basic theory which defines the correlation between the BDS, dielectric constant, dissipation factor, sample thickness, and volume resistivity. The results obtained from the equation are also compared with the experimental values. The suggested equation will be helpful to predict the BDS of any non-cellulosic material without experimentation in the laboratory.

• 한국전자파학회논문지
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• 제19권10호
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• pp.1115-1121
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• 2008

본 논문에서는 유전체의 유전 상수를 결정하기 위하여 유전체 슬랩을 원통형 공진기에 삽입하여 측정하는 기술을 제안한다. 유전 상수는 빈 공진기와 유전체 슬랩이 삽입된 공진기의 공진 주파수 편차에 의해 측정된다. 특성 방정식은 정확한 필드 해석에 의해 정의되었다 측정 장치는 HP8719A 벡터 네트웍 분석기와 금속 재질의 원통형 공동 공진기를 이용하였다. 이론적인 증명은 실험과 3D 시뮬레이터인 CST사의 MWS 4.0에 의해 확인되었다. 측정 된 결과는 전반적으로 만족하였다. 측정 된 테플론과 베이클라이트의 비유전율은 각각 2.03과 4.44이다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2002년도 하계학술대회 논문집
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• pp.451-454
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• 2002

A silicone rubber has been used so many dielectric materials for extremely high voltage(EBW) electric appliances. The reason why it is very stable in the thermal, mechanical and electrical environment. In this paper, we have studied the dependence of dielectric characteristics of silicone rubber on frequency-dependent variation. The dielectric characteristics were measured in the temperature range of 25[$^{\circ}C$] and 150[$^{\circ}C$]. Also we measured in the voltage range of 1[V] and 20[V]. The energy of activation on the dielectric loss obtained 2.44[kcal/mol], 2.1[kcal/mol], 1.63[kcal/mol] and 1.57[kcal/mol] by appling respectively.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 추계학술대회 논문집 학회본부
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• pp.422-424
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• 1996

The dielectric constants of small particles are estimated using negative dielectrophoresis(DEP). A pair of cylindrical electrodes is proposed to produce a non-uniform electric field that levitates a dielectric particle. Measuring the height of the levitated particle, we can calculate the effective polarizability, and estimate the dielectric constant of the particle using a nonlinear regression method. By determining dielectric constant of polystyrene and polychloromethylstyrene particle, the proposed electrode structure and method show the possibility to measure the dielectric constants of dielectric particles.

• 한국전기전자재료학회논문지
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• 제29권9호
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• pp.565-570
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• 2016

In this work, the complex permittivity of epoxy resins is measured. Epoxy resins, epoxy with micro size fillers and epoxy with micro+nano alumina composites have been evaluated for dielectric properties according to frequency variation. The dielectric spectroscopy measurement and analyses are carried out in the frequency range of $10^{-2}Hz$ to 1MHz and constant to room temperature. The results of dielectric loss suggest that significant improvement in the electrical performance can be expected by using samples containing nano and micro fillers mixture when compared to materials containing only microfillers. As the result, we verified the specific characteristics of dielectric permittivity and dielectric loss namely, relative permittivity become low with improving dispersibility of nano+micro mixture composites and become rise with agglomerate of nano particles.

• 마이크로전자및패키징학회지
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• 제9권2호
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• pp.61-67
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• 2002

최근 전자제품의 경박단소화 추세는 전자기기의 크기와 가격의 감소를 이끌어냈으며, 이러한 추세는 당분간 지속될 전망이다. 이에 따라 내장형 수동소자기술에 대한 연구가 활발히 진행되고 있다. 내장형 축전기 제조기술의 핵심은 높은 유전상수를 갖는 재료를 저온에서 인쇄회로판 위에 형성하는 것이다. 본 고에서는 내장형 축전기용 유전재료로 사용되는 재료들에 관하여 간략하게 소개하고자 한다.

• 한국재료학회지
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• 제12권6호
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• pp.442-446
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• 2002

Design of microwave absorbers using high frequency properties of fiber reinforced composites are investigated. Two kinds of composite materials (glass and carbon) are used and their complex permittivity and permeability are measured by transmission/reflection technique using network analyzer. Low dielectric constant and nearly zero dielectric loss are determined in glass fiber composite. However, carbon fiber composites show the high dielectric constant and large conduction loss which is increased with anisotropy of fiber arrangement. It is, therefore, proposed that the glass and carbon fiber composites can be used as the impedance transformer (surface layer) and microwave reflector, respectively. By inserting the foam core or honeycomb core (which can be treated as an air layer) between glass and carbon fiber composites, microwave absorption above 10 dB (90% absorbance) in 4-12 GHz can be obtained. The proposed fiber composites laminates with sandwitch structure have high potential as lightweight and high strength microwave absorbers.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.391-394
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• 2003

It is inevitable that reconsideration of the use of lead oxides in the electronics industry be undertaken as long as detrimental effects to the environment remain. To solve this problem, many recent studies on Pb-free compositions for PDP (plasma display panel) dielectric layers and also sealing glass compositions have been made. The present study was conducted to investigate whether the alternative systems for leadfree low firing glasses, detailed below, are available for use in PDP materials. The results suggest that low-melting phosphate glasses would be suitable as an alternative material for the Pb-based dielectric layer, sealants and barrier ribs in PDP.