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오늘 본 자료
이종규,김왕섭,김경용,Lee, Jong-Kyu,Kim, Wang-Sup,Kim, Kyeong-Yong 한국재료학회 1992 한국재료학회지 Vol.2 No.4
본 실험에서는 낮은 음의 온도계수를 갖는 저온 소결 유전체에 대해 연구하였다. 새로 개발된 재료의 조성은 Ti$O_2$(100-X) CuOx(X=1~5wt%)에 미량의 Mn$O_2$를 첨가 하였다. CuO를 첨가하지 않은 경우에는 저온 (90$0^{\circ}C$) 에서 소결이 진행되지 않았다. CuO 함량이 증가할수록 저온에서 소결이 가능하였으나, 유전율이 낮아지고 유전손실은 증가 하였다. Mn$O_2$를 0.6wt% 첨가한 경우 유전율과 Q값이 가장 높게 나타났다. Low-firing dielectric materials with negative small temperature coefficients were investigated. The newly developed materials are based on Ti$O_2$(100-x)/ CuOx(X=1~5wt%) with small amount of Mn$O_2$ additive. The sample without CuO was not sintered at 90$0^{\circ}C$. As CuO content was increased the sample could be sintered at low temperature. However, the dielectric constant was decreased and the dielectric loss was increased. In the case of adding 3wt% CuO and 0.6wt% Mn$O_2$, the dielectric constant and the Q values appeared very high.
유전체 원주공진기법에 의한 고주파 유전특성 측정에 관한 연구
김경용,김왕섭,최환,Kim, Kyung-Yong,Kim, Wang-Sup,Choi, Hwan 대한전자공학회 1995 전자공학회논문지-A Vol.32 No.3
Measurement factors for the dielectric properties of low dielectric loss materials (tan${\dalta}{\le}10^{-4}$) were investigated using the dielectric rod resonator method. It was shown that the relative conductivity (${\sigma}_{r}$) should be controlled within a 5% to obtain the standard deviations of less than 0.07 for permittivity .epsilon.r and 0.06${\times}10^{-4}$ for tan.delta.respectively. Surface resistivity (R$_s$) could be reduced when the surface roughness of parallelled conducting plate was less than 0.07 .mu.m. Measurement error for the permittivity was $\pm$0.02% independent of probe loop size, whereas the error in Q value was reduced with the decrease in probe loop size and also with the increase in the absolute values of Q. Reliable Q values were determined with the probe loop size of less than 4mm. The accurate for the distance between the measuring probe loop and the sample could be obtained when the insertion loss of resonant frequency ranged -15dB - -30dB.
Dielectric Properties of ($Pb_{1-x}Ca_{x})ZrO_{3}$ Ceramics at Microwave Frequencies
이상윤,최환,김왕섭,김경용,Lee, Sang-Yoon,Choi, Whan,Kim, Wang-Sup,Kim, Kyung-Yong The Institute of Electronics and Information Engin 1992 전자공학회논문지-A Vol.29 No.10
A ($Pb_{1-x}Ca_{x})ZrO_{3}$ system which has a high dielectric constant, low dielectric loss and temperature coefficient was investigated. For sintering temperatures above 1350$^{\circ}C$ the microstructures of sintered bodies were unchanged regardless of the amount of CaO. The dielectric constant and dielectric loss decreased and the temperature coefficient varied from positive to negative with the increasing amount of CaO. For the CaO content of 0.37, i.e. ($Pb_{0.63}Ca_{0.37})ZrO_{3}$, the ceramic showed very good dielectric properties such as ${\varepsilon}_1$=100, Q > 1200 at 3GHz, and T$_f$=$\pm$3ppm/$^{\circ}C$.
Study on Multilayer Chip Inductor
김경용,이종규,김왕섭,최환,Kim, Kyung-Young,Lee, Jong-Kyu,Kim, Wang-Sup,Choi, Hwan The Institute of Electronics and Information Engin 1991 전자공학회논문지-A Vol.28 No.11
Multi-layered chip inductors were prepared with good magnetic properties by sintering Ni-Zn-Cu ferrites at a lower temperature. A slurry with 49.5mol%Fe$_{2}O_{3}$, 20.5mol% ZnO, 20mol% NiO and 10nol% CuO was cast into tapes with 60-100\ulcorner of thickness with a doctor blade techniques. The tapes were screen-pronted with 100% silver electrodes, layered and pressed at 250kg/cm$^{2}$ and then sintered ant 900$^{\circ}C$ for 2h. Inductance with internal electrodes printed 5, 10, and 15 turns showed 4.9, 15 and 24$\mu$, respectively, at 1MHz.
수축율 조절에 의한 적층 칩 LC Filter의 동시 소성에 관한 연구
김경용,이종규,김왕섭,최환,Kim, Kyung-Yong,Lee, Jong-Kyu,Kim, Wang-Sup,Choi, Hwan 한국세라믹학회 1991 한국세라믹학회지 Vol.28 No.9
Among many problems that need to be solved in the process of preparing multilayer chip LC filters, we studied the control of shrinkage in order to prevent the crack, warpage, and/or delamination which occurs at the interface between the inductance (L part) and the capacitance (C part). Shrinkage was controlled by compositions, powder size, calcining temperature and amount of organic binder. Capacitance sheet was prepared by mixing 65 wt% binder with the composition of 96 wt% TiO2 having an average particle size of 0.5 $\mu\textrm{m}$, 3 wt% CuO. After small amount of MnO2 and SiO2 added, it was calcined at 750$^{\circ}C$ for 2 hr. Inductance sheet was prepared by mixing 60 wt% binder with the composition of 49.5% mol% Fe2O3, 20.5 mol% ZnO, 20 mol% NiO and 10 mol% CuO which was calcined at 775$^{\circ}C$ for 2 hr. These sheets was laminated at 250 kg/$\textrm{cm}^2$, and cofired at 900$^{\circ}C$ for 2 hr to give rise to a multilayer chip LC filter without any warpage.