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E-波의 入射에 의한 接地 誘電體層을 가지는 抵抗띠 格子구조의 電磁波散亂에 關한 硏究
윤의중 京畿專門大學 2001 京畿專門大學 論文集 Vol.- No.29
In this paper, E-polarized scattering by a resistive strip grating with a grounded dielectric layer is analyzed by applying the PMM(Point Matching Method) as a numerical procedure. The scattered electromagnetic field is expanded in a series of Floquet mode functions. We apply the boundary conditions to obtain the unknown field coefficients and the resistive boundary condition is used for the relationship between the total tangential electric field and the electric current density on the strip. When the incident angle is normal incidence, the minimum value of the geometrically normalized reflected power according as relative permittivity is increased, it should be noted that the value of the strip width gets moved toward high value. Then most energy by a normal incident wave is scattered in direction of the other angles except normal incident angle.
E-波의 入射에 의한 接地誘電體 平面을 가지는 導體띠 格子構造에서의 電磁波散亂에 關한 硏究
윤의중 京畿專門大學 1998 京畿專門大學 論文集 Vol.- No.26
In this paper, Electromagnetic scattering problem by a perfectly conducting strip grating with a grounded dielectric plane by incidence of a electric wave is analyzed by applying the PMM (Point Matching Method) known as a simple procedure. The scattered electromagnetic fields are expanded in a series of Floquet mode functions. The boundary conditions are applied to obtain the unknown field coefficients and the conducting boundary condition is used for the relationship between the tangential electric field and the electric current density on the strip. When the incident angle is normal incidence, the minimum value of the geometrically normalized reflected power according as relative permittivity is increased, it should be noted that the value of the strip width gets moved toward high value. Then most energy by a normal incident wave is scattered in direction of the other angles except normal incident angle.
平行 結合 마이크로스트립 線路를 利用한 帶域通過필터에 關한 硏究
尹義重,李潤鉉 한국항공대학교 1990 論文集 Vol.28 No.-
This paper discribes on parallel coupled microstrip band pass filter synthesis procedure. Exact analysis of parallel coupled microstrip line structure, that is this proportionately is then performed by evaluationg the transmission coefficient as a function of frequency with the aid of a computer. The wide about 50% pass bandwidth could be obtained for a microstrip band pass filter of 4 and 6 [GHz] center frequency using the parallel coupled microstrip transmission line. A method for filter synthesis was proposed and correlation between analytical and computer simulation results showed good agreement for parallel coupled microstrip line structure.
Moment Method을 이용한 스트립 回折格子에 의한 TM 散亂
尹義重,李潤鉉 한국항공대학교 1991 論文集 Vol.29 No.-
무한한 길이를 가지며, 미소두께를 가지는 완전도체 strip 回析格子의 電流分布를 임의의 방향으로 부터 비스듬히 TM波가 入射하는 경우에 대해서 고찰하였다. TE波에 대해 경계조건이 만족되는 式을 얻고, 모멘트 法을 적용하여 電流分布와 반사계수를 구하였고, strip 상에 유도되는 전류분포에 대해서는 h=0.2[λ]경우에서 strip간격 s=2w일때 특성이 양호하였고, 반사계수는 strip 회절격자에 수직으로 입사한 경우 s=1[λ]이하일 때 좋은 결과를 얻었다. In this paper, current distribution for strip grating of perfect conductivity, infinite length and infinitesimal thickness are discussed for E-polarization plane wave are oblique incidence case from arbitrary direction. First all equation which satisfies the boundary condition is set up for the case of E-polarization. Then it is solved by the moment method to get the induced current density. In the result of computer simulation the reflection coefficient and current distribution induced the open surface of a strip grating. It is shown that the current density obtained good results provided the space=2w and h=0.2 [λ] and the reflection coefficient for a strip grating with normal incidence obtained good results for the spacing is less than one wavelength.
윤의중 京畿專門大學 2000 京畿專門大學 論文集 Vol.- No.28
In this paper, it has been carried out to solve the Electromagnetic Environment and EMI/EMC(Electromagnetic Interference/Electromagnetic Compatibility) problems in high performance of electronic test and measurement products. The electric and magnetic fields radiated by lighting discharges are significantly changeable in amplitude and time, one of the topics concerning electromagnetic compatibility of modern electronic system is the efficient and economic protection against transient voltages caused by not only by direct but also by nearly lighting strokes. The electromagnetic and magnetic fields waveforms associated with lighting return strokes are significantly different with those of intracloud discharges.
마이크로스트립 線路를 利用한 低域 通過 필터에 關한 硏究
尹義重,李潤鉉 한국항공대학교 1990 論文集 Vol.28 No.-
This paper discribes on microstrip low pass filter synthesis procedure. Exact analysis of the low-high-low and high-low-high microstrip line structure, that is this proportionately is then performed by evaluationg the thransmission coefficient as a function of frequency with the aid of a computer. A method for filter synthesis was proposed and correlation betweeen analytical and experimental results showed good agreement for low-high-low and high-low-high microstrip line structure.