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강부식,장재성,이청민 濟州大學校工科大學附屬産業技術硏究所 1993 尖端技術硏究所論文集 Vol.4 No.-
Double-plane steps discontinuity in rectangular waveguide is investigated with ?? mode analysis. This method accounts for the influence of evanescent fields and power transmission due to higher order modes. For these discontinuites the electromagnetic fields are derived and the scattering matrix is derived by applying the continuous condition in discontinuity. The scattering coefficients of a X-band to Ku-band waveguide transition as well as of resonant iris with finite thickness(t=2.0㎜) are calculated and compared with Patzelt's result. The scattering coefficients of the resonant iris(a=7.112㎜, b=3.556㎜, a₁=4.0㎜, b₁=1.0㎜, t=0.5㎜) are calculated and compared with Bornemann's results.
이기태,장재성,김장형 濟州大學校工科大學附屬産業技術硏究所 1992 尖端技術硏究所論文集 Vol.3 No.-
The current induced on a perfectly conducting strip excited by incident fields which are transverse magnetic (TM) wave or transverse electric (TE) wave to the strip axis are solved by three methods. The one is analytic and the others are numerical methodd; SIT (Spectral Iteration Technique), CGFFT (Conjugate Gradient Fast Fourier Transform). It is estimated accuracy of current values, as that are compared results of the analytic method with that of the numerical methods. The procedure involves the incorporation of subdmain basis functions associated with the current representation of a conducting strip. It is shown that significant improvements are achieved in the convergences of the CGFFT method when using sinc basis functions.
이청민,장재성,강부식 濟州大學校工科大學附屬産業技術硏究所 1993 尖端技術硏究所論文集 Vol.4 No.-
Received field strength in land mobile-radio communication must consider characteristics besides. This paper analysis propagation chracterics to multipath and then compute theoretical value of field strength which vectorial compose and compared with measured value. Seorm base station is to unity south area of Cheju by single propagation area. But Gunwelak base station cause a weak and impossible received field area to increase obstruction. In order to replace it, we necessary technique study of new mobile communication propagation environment. For take a accuracy received field strength, the first thing field strength of a point must measure many times and calculate mean value of it. The second we must suggest and analytical modeling to compose to these measured values.
강부식,이청민,장재성 濟州大學校 工科大學 産業技術硏究所 1993 産業技術硏究報告 Vol.4 No.-
Double-plane steps discontinuity in rectangular waveguide is investigated with TE^(x)_(mn) mode analysis. This method accounts for the influence of evanescent fields and power transmission due to higher order modes. For these discontinuites the electromagnetic fields are derived and the scattering matrix is derived by applying the continuous condition in discontinuity. The scattering coefficients of a X-band to Ku-band waveguide transition as well as of resonant iris with finite thickness (t=2.0mm) are calculated and compared with Patzelt's result. The scattering coefficients of the resonant iris (a= 7.112mm, b= 3.556mm, a_(1) = 4.0mm, b_(1) =1.0mm, t=0.5mm) are calculated and compared with Bornemann's results.
이기태,김장형,장재성 濟州大學校 工科大學 産業技術硏究所 1992 産業技術硏究報告 Vol.3 No.-
The current induced on a perfectly conducting strip excited by incident fields which are transverse magnetic (TM) wave or transverse electric (TE) wave to the strip axis are solved by three methods. The one is analytic and the others are numerical method: SIT (Spectral Iteration Technique), CGFFT (Conjugate Gradient Fast Fourier Transform). It is estimated accuracy of current values, as that are compared results of the analytic method with that of the numerical methods. The procedure involves the incorporation of subdmain basis functions associated with the current representation of a conducting strip. It is shown that significant improvements are achieved in the convergences of the CGFFT method when using sinc basis functions.