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장행종,임영석 대한전자공학회 1994 전자공학회논문지-A Vol.31 No.10
In this paper, by modeling the Multilayer-Multiconductor Transmission Line(MMTL) with the characteristic parameters-effective dielectric constant, eigen modal voltages, characteristic impedances at each mode, pulse propagation characteristics of MMTL network are simulated. Transmission line modelling is performed in frequency domain, then time domain resposes are obtained by transforming the frequency domain response using fast Fourier transform.
최오석,남훈,장행종,임영석 전남대학교 전자통신기술연구소 2002 전자통신기술논문지 Vol.5 No.1
In this paper, a four-pole quasi-elliptic function bandpass filter of 1.95 GHz center frequency with 60 MHz bandwidth for IMT-2000 is designed and fabricated using the compact microstrip resonator. The proposed resonator consists of microstrip interdigital circuit between open stub or open gap, which results in compact size as well as the suppression of harmonic. Bandpass filter using this resonator shows good microwave characteristic with the harmonic suppression about -15 dB at 6.5 GHz. The results of measurement are almost similar to those of simulation.