서지주요정보
쇄기형 유전체에 의한 전자파의 회절 = Diffraction of electromagnetic waves by a dielectric wedge
서명 / 저자 쇄기형 유전체에 의한 전자파의 회절 = Diffraction of electromagnetic waves by a dielectric wedge / 김세윤.
저자명 김세윤 ; Kim, Se-Yun
발행사항 [서울 : 한국과학기술원, 1984].
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소장정보

등록번호

4102779

소장위치/청구기호

학술문화관(문화관) 보존서고

DEE 8407

SMS전송

도서상태

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초록정보

When a plane wave is incident upon a dielectric wedge of arbitrary wedge angle, the scattered field may be obtained by solving a dual integral equation in the spectral domain. This dual integral equation is the two dimensional Wiener-Hopf-Fock type integral equations. Factorization of this equation is not possible and an approximate solution is tried. A geometric optics solution for the wedge may easily be obtained. The physical optics solution for the wedge is then obtained from the boundary fields of the geometric optical approximation. one may define a correction field that is added to the physical optics approximation to satisfy the original dual integral equation. It may be shown that the correction field is to correct the edge diffracted field of the physical optics solution. The fields reflected, refracted, and transmitted from the boundaries are retained as in the geometric optics solution for the corrected solution. The correction of the edge diffracted field may be calculated asymptotically by assuming a multipole time source at the edge. Then from the dual integral equation for the correction field, One may-derive a dual series equation for the multipole expension coefficients, which is easily amenable to numerical calculation. The other way to correct the edge diffraction is to assume sheet currents along the dielectric boundaries. One may require these sheet currents to satisfy the edge condition and the dual integral equation. Arbitrary sheet currents may be expanded in a series of Bessel functions (Neumann's expansion), where the order of Bessel function is the fractional order to satisfy the edge condition of the static limit. Dual integral equation then yields the dual series equation for the Neumann's expansion coefficients. The calculation of these expansion coefficients is to correct the edge diffraction of the physical optics approximation where the far field pattern is well known. The Bessel series satisfying the edge condition, however, gives fields which converge rather slowly in the far field region. One may therefore convert this series expansion into another series that converges fast in the far field region and numerical calculation for the correction field is made. The numerical calculation of the correction field shows that the sheet current method yields more accurate results than the multipole expansion method. Corrected edge diffracted field patterns and the total field patterns are calculated and are shown in figures.

서지기타정보

서지기타정보
청구기호 {DEE 8407
형태사항 v, 120 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Se-Yun Kim
지도교수의 한글표기 : 나정웅
지도교수의 영문표기 : Jung-Woong Ra
학위논문 학위논문(박사) - 한국과학기술원 : 전기 및 전자공학과,
서지주기 참고문헌 : p. 117-120
주제 Electromagnetic waves --Diffraction.
Diffractive scattering.
Geometrical optics.
Physical optics.
쐐기형. --과학기술용어시소러스
전자파 회절. --과학기술용어시소러스
기하 광학법. --과학기술용어시소러스
유전체. --과학기술용어시소러스
전자파 산란. --과학기술용어시소러스
Dielectric wedges.
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