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에너지 트랩형 압전 세라믹 필터의 분산특성에 관한 연구
宋埈泰,鄭仁永,陳弘範 成均館大學校 科學技術硏究所 1989 論文集 Vol.40 No.1
The energy trapping theories of the ferroelectric ceramic polarized in the thickness direction are analyzed by the same way which was developed by H.F. Tiersten and B.K. Sinha. The dispersion curves of two special cases, one with PZT-7A ceramic and the other with PZT-4 ceramic, are obtained and compared. From the dispersion curves, we can see that the greater piezoelectric coupling coefficient is the wider bandwid bandwidth is. The results of this paper can be used for the selection of materials which have suita-ble bandwidth.
Pb(Mn_(1/8)Sb_(1/8)Nb_(5/8)) O_3-PbTiO_3-PbZrO_3係 壓電세라믹을 應用한 필터에 관한 硏究
宋埈泰,朴基燁 成均館大學校 科學技術硏究所 1991 論文集 Vol.42 No.1
PZT on Pb(Mn_(1/8)Sb_(1/8)Nb_(5/8)) O_3-PbTiO_3-PbZrO_3 system compound (Pb Sb Nb) system and (Pb Mn Nb) system have properties Resonance frequency of the variations of temperature. This PZT on 0.15[Pb(Mn_(1/8)SB_(1/8)Nb_(5/8)) O_3-0.35PbTiO_3-0.5PbZrO_3 system compound piezoelectric ceramics have high value of density and shrinkage it study on filter using high value of εs, Kp and Qm, Fr nearly constand with temperature PZT ceramics high value of small width a size. Therefore, it can make good use of the filter materials.
宋埈泰,鄭仁永,李鍾德,徐東勳 成均館大學校 科學技術硏究所 1991 論文集 Vol.42 No.1
The thickness -extensional trapped energy mode vibrations are treated analytically. In each program the solution cinsists of a sum the dominant plate eigensolutions for shoted electrodes in the electroded resgion and for zero surface charge in the unelectroded region. The driven thickness solution is also included in the electroded region in the programs of forced vibrations. Combinations of these solutions for the infinite plate, which satisfy the differance equations and boundary conditions on the major surfaces exactry, are then employed in an appropriate variational principle of the linear piezoelectricity in order to satisfy the remaining boundary conditions at the junction between the electroded and unelectroded regions approximately.
宋埈泰 成均館大學校 1983 論文集 Vol.33 No.-
This paper showed the technique how to change the bandwidth of ceramic filter at will. The resonant mode of trapezoid type ceramic filter is synthesized by the resonant mode of the major side and the minor side independently, so the bandwidth is broadened. In this result if some constants of ceramic filter are known, two port ceramic filter showing a wanted bandwidth can be fabricated easily. In those computer simulations. the bandwidths were changed from 3.2kHz to 6.4 kHz in sample A, and from 5. 1kHz to 10.2 kHz in sample B.
9.5/65/35 PLZT를 이용한 Color filtering 특성에 관한 연구
宋埈泰,余東勳,李範熙 成均館大學校 科學技術硏究所 1992 論文集 Vol.43 No.1
In this study 9.5/65/35 PLZT was selected which has the excellent quadratic electro-optic property and slim-loop. It was fabricated by the methods of vacuum hot-pressing and sintering. The electrode of color filter was evaporated using the interdigital type masks. They had the ratio of electrode gaps and the specimen thickness which were 1 : 1, 1.5 : 1, 2 : 1, and 2.5 : 1. Its color filtering characteristics were measured in the range of wavelength 380 to 780[nm] and electric field 0 to 15[kV/cm]. The results shows the relationship between the thickness of specimen, the electrode gap and the maximum RGB transmittance.