서지주요정보
接地된 板上의 誘電體層 위에 位置한 週期的인 스트립格子 構造에 의한 電磁氣波의 散亂 및 輻射 = Scattering and radiation of electromagnetic fields by a periodic strip grating on a grounded dielectric slab
서명 / 저자 接地된 板上의 誘電體層 위에 位置한 週期的인 스트립格子 構造에 의한 電磁氣波의 散亂 및 輻射 = Scattering and radiation of electromagnetic fields by a periodic strip grating on a grounded dielectric slab / 조영기.
발행사항 [대전 : 한국과학기술원, 1998].
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DEE 98001

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The historical summary in Chapter. 1 outlines some pnor works on the relevant areas such as Wood anomaly. Bragg and off-Bragg blazing phenomena and the guided leaky wave . and their limitations. Rectangular groove reflection grating is studied extensively for th Bragg-angle blazing and the off-Bragg blazing. when the Bragg-angle blazing means that all the incident power is scattered back into the direction of incidence which equals the first order Bragg backscattering angle. Off- Bragg blazing means that its scattered wave propagates in the direction different from the Bragg backscattering angle. An experimental study of the plane wave scattering from the periodic strip grating on a grounded dielectric slab showed the Bragg blazing. Little attention is given to the off-Bragg blazing nor the relationship between the scattering and the leaky wave radiation by the periodic strip grating on a grounded dielectric slab. Chapter 2 then. describes the analysis method for the electromagnetic scattering by the geometry for the TE(Transverse Electric) case from the viewpoints of both the reflection grating and the leaky-wave antenna problems. The induced electric current density on the strip as unknowns is expanded into a product of a series of Chebyshev polynomials and a function satisfying edge condition. Galerkin ' s scheme is employed for testing. Fast convergence of solution is illustrated in comparison with the point matching method. Numerically calculated results for Bragg-angle blazing are presented and compared with previous experimental results, Some interesting characteristics ofthe Bragg blazing as well as Off-Bragg blazing are observed in the structure. In particular, it is pointed out that the Bragg-angle blazing may be of two types, one associated with the guided leaky wave and the other not relevant to it. It is also found that the off-Bragg blazing phenomena exists only if the leaky wave is guided by the present geometry. The existence of the off-Bragg blazing phenomena in the present geometry is an interesting result since the off-Bragg blazing has not been reported in the conventional reflection gratings such as rectangular groove grating, echelete grating. and holographic grating within sinusoidal profile. In Chapter 3. T1\I-polarized electromagnetic wave scattering IS considered with that for the guided leaky wave. Equivalence principle is utilized to retain the same formulation for TE polarization. The numerical results of the plane wave scattering around the blazing angle are presented and compared with those of the experimental works of Fair et al.. Some characteristics of the Bragg as well as Off-Bragg blazing phenomena are discussed. In Chapter 4. scattering and radiation problems of electromagnetic waves in the case of oblique incidence and arbitrary polarization are analysed in the spectral domain with sampling. Some numerical examples are shown for the surface current distributions and the variation in the power of significant scattered modes for the case of the arbitrary polarization and oblique incidence. Numerical results exhibit a good convergence even for a small truncation number. In particular. the Bragg as well as the off-Bragg angle blazing phenomena in the case of arbitrary incident angle and polarization are discussed from the viewpoints of both the reflection grating and the leaky-wave antenna in detail. In addition, the relationship between the Bragg blazing and characteristic mode of the surface current in the strip is pointed out. Chapter 5 concludes and further problems are discussed In Chapter 6.

서지기타정보

서지기타정보
청구기호 {DEE 98001
형태사항 vii, 163 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Young-Ki Cho
지도교수의 한글표기 : 라정웅
지도교수의 영문표기 : Jung-Woong Ra
학위논문 학위논문(박사) - 한국과학기술원 : 전기및전자공학과,
서지주기 참고문헌 : p. 148-163
주제 전자파 회절
반사격자
누설파안테나
Electromagnetic wave diffraction
Reflection grating
Leaky wave antenna
Bragg and off-bragg angle blazing
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