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비대칭 유전체 인덕티브 스트립을 이용한 도파관형 대역통과 여파기의 설계
임재봉(Jae Bong Lim) 대한공업교육학회 1979 대한공업교육학회지 Vol.4 No.1
In this paper, the equivalent circuit of a dielectric inductive strip assymmetrically loaded in waveguide is analyzed theoretically by evaluating the inductive reactance of the equivalent T-Network which was obtained by the Rayleigh-Ritz method. A design theory for the band-pass filter of this type is derived from this equivalent circuit and the design charts are proposed. The experimental results are found to be in good agreement with the theory.
폴리퀴놀린의 합성과 방사에 관한 연구 (II)-퀴놀린 단위를 갖는 방향족 폴리아미드의 합성과 그 특성-
임재봉,김경아,홍성일,박종래 한국섬유공학회 1992 한국섬유공학회지 Vol.29 No.7
Diamine monomers which have quinoline unit, 6-amino-2-(p-amino phenyl) -4-phenyl quinoline and 6-amino-2-[4- (p-amino phenoxy) phenyl]-4-phenyl quinoline, were synthesized by the acid-catalyzed Friedlander quinoline synthesis method and identified by IR spectra,R-NMR spectra and elemental analysis. Aromatic polyamides were synthesized by low-temperature solution polymerization using above monomers with terephthaloyl chloride for homopoly-merization, using above monomers and p-phenylene diamine with terephthaloyl chloride for copolymerization. The existing aromatic polyamide, PPTA, was also polymerised in the same method for comparison. For all the synthesized polymers, some characterization such as solubility test for various organic solvents, thermogravimertric analyses were carried out. And liquid crystalline textures of polymers were examined through polarized microscope. As the results of those tests, most polymers were soluble in some organic solvents containing metal salts and their initial decomposition temperatures were found to be near 500˚C. Tensile test of fibers obtained from polymerization dope by direct spinning were carried out.