• 한국전자파학회논문지
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• 제29권10호
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• pp.799-804
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• 2018

본 논문에서는 일반 측정환경에서 자유공간 물질상수 측정법을 사용한 판형 유전체의 유전율 측정 방법을 제안한다. 측정에는 회로망분석기와 동일한 두 개의 혼 안테나가 S-parameter 측정을 위해 사용되었으며, 측정 결과로부터 판형 유전체의 투과 및 반사계수를 계산하였다. 정밀한 측정을 할 수 없는 환경에서 신뢰할 수 있는 유전율을 얻기 위하여 상대적으로 측정 환경에 의한 측정불확도가 작은 투과계수의 크기만을 유전율 추정에 이용하였으며, 최종적으로 다양한 주파수에서 측정된 결과를 비교하여 유전율을 특정하였다.

• E2M - 전기 전자와 첨단 소재
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• 제10권9호
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• pp.960-967
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• 1997

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1331-1333
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• 2001

In this study a measurement equipment was designed and made for the nonlinear dielectric constants in dielectrics. The determining method of the nonlinear dielectric constants also was proposed. The measurement equipment was consisted of the wave generation part, the high voltage amplifier part, the measurement part and the data acquisition part. In this equipment the measurement control and the data processing could be conducted by computer. In order to determine the nonlinear dielectric constants alternating sign-wave electric fields are applied to dielectrics with different magnitude and the waves of the electric fields and the response from dielectrics are stored in computer memories. The harmonics of dielectric displacement are obtained by the Fourier transformation of these waves. The nonlinear dielectric constants are determined at the relatively low-field region. The experiment for PZT ceramic samples was done by the equipment and the determining method and as the result meaningful data were obtained.

• 한국정보통신학회논문지
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• 제15권1호
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• pp.9-15
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• 2011

마이크로스트립 선로를 이용하여 기판의 유전율을 광대역에서 빠르고 쉽게 측정하는 방법을 제시하였다. 산란계수를 이용하여 1차 반사계수와 1차 전송계수를 구하여 기판의 복소 유전율과 복소 투자율을 계산하는 과정을 보였다. 기존에 유전율을 알고 있는 기판에 제작한 마이크로스트립 라인의 산란계수를 회로망분석기를 이용하여 측정하여 기판유전율을 확인하였다. 이 방법은 유전율을 모르는 기판의 유전율을 측정하는데 적용가능하다.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2000년도 종합학술발표회 논문집 Vol.10 No.1
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• pp.243-247
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• 2000

In this parer, Q-factor measurement method for a dielectric resonator in an MIC environment using the effective dielectric constant is proposed. The effective dielectric constant technique is applied to both radial and axial directions. The proposed method shows that the accuracy of the Q-factor measurement is to be improved with 2% ～ 3% relative error.

• 한국전기전자재료학회논문지
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• 제21권1호
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• pp.53-56
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• 2008

The commercial parallel plate electrodes system with guard-ring electrode have been widely used for measurement of dielectric constants of solid materials. And the specification of the electrodes system is about 1 % of measurement uncertainty. This measurement uncertainty is only estimated the error come from mechanical measurements such as the area of the electrodes and the gap between the electrodes except the error come from the air gap between the electrodes and dielectric specimen. Because it is impossible to measure the air gap. This study analyze the total measurement uncertainties of the commercial dielectric constant test cell using 3 kinds of Standard Reference Materials. As a results, the total measurement uncertainty is much bigger than 1 % and the most of the uncertainty can be reduced by compensation of the error values evaluated in this study.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1998년도 추계학술대회 논문집
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• pp.187-190
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• 1998

In this paper a probe for the' measurement of dielectric properties of dielectric sheet materials is designed and implemented as a coaxial air line type. Using the broadband impedance method with this measurement probe the dielectric constant and loss tangent of the glass-epoxy and teflon are determined in the frequency range of 0.1 - l.O[GHz] with the temperature variation from $25[^{\circ}C]$ up to $65[^{\circ}C]$. A measured relative dielectric constant of the glass-epoxy is 4.42 and a loss tangents is 0.019 relatively, and the relative dielectric constants of teflon is 2.17 and a loss tangents is 0.002 relatively

• 비파괴검사학회지
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• 제22권4호
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• pp.369-376
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• 2002

마이크로파 자유공간전송기법을 이용하여 생물자원인 곡류의 유전특성을 비파괴 방법으로 측정하였다. 마이크로파를 송신하고 수신할 수 있는 혼 안테나, 샘플홀더, network analyzer 를 이용하여 9.5 GHz에서의 마이크로파 측정 시스템을 구성하였다. 여러 가지 수분함량에서 산물밀도가 서로 다른 시료를 투과하여 나오는 마이크로파의 감쇠와 위상 변이로부터 유전상수와 유전손실을 측정하였다. 시료의 유전상수와 유전손실은 샘플홀더 내에 충진되는 시료의 수분함량과 산물밀도가 증가함에 따라 증가하였으며 수분함량과 산물밀도의 팝으로 표시되는 수분밀도를 이용할 경우 산물밀도와 시료 품종의 변이를 보정할 수 있는 것으로 나타났다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.482-483
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• 2007

For measurement of dielectric constants, the commercial parallel plate electrodes system with guard-ring electrode have been widely used up to now. The capacitance derived from the parallel plate electrodes capacitor with guard-ring electrode is calculated by the equation of ($C={\epsilon}\;{\cdot}\;\frac{area\;of\;electrod}{distance\;between\;electrodes}$). Therefore, in parallel plate electrode capacitor, the diameter of the guarded electrode, the gap size between guarded electrode and guard ring, and distance between two active electrode should be measured precisely to calculate dielectric constants from the measured capacitance. Consequently their mechanical measurement uncertainties are directly contributed. Especially the air-gap between the electrodes and dielectric specimen at the system must be existed and the measurement error derived from the air-gap is impossible to evaluate as measurement uncertainties. In this study, we analyze the uncertainty of the commercial dielectric constant test cell using 3 kinds CRMs.

• 펄프종이기술
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• 제34권5호
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• pp.49-55
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• 2002

A new method is proposed for the on-line measurement of the fiber orientation of sheet materials. The measurement of fiber orientation is very important in manufacturing paper sheets, non-woven fabrics, and glass sheets, because fiber orientation strongly affects product properties represented by, for example, dimensional stability of paper. A method developed in this research utilizes anisotropy of dielectric constants of sheet materials as a key characteristic to determine the fiber orientation. The new on-line sensor, consisting of 5 microwave dielectric resonators set in different directions, was designed to detect the fiber orientation while paper is running with high speed on a paper machine. This sensor can determine the direction and the degree of fiber orientation from the measured direction of the maximal dielectric constant and its variation, respectively. The fundamental performance of this system was examined by the static measurement of printing grade paper, which gave a satisfactory result. Then, the dynamic measurements were done at a speed of 1,000 m/min by using a high-speed test-coating machine.