Browsing by Author "Shiao, CM"

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Distribution of current induced on metal-strip gratings by plane wave
(1998-06-01)
Shiao, CM
;
Peng, ST
;
電信工程研究所
;
Institute of Communications Engineering
In this paper, we present a rigorous analysis of current distribution induced on a metal-strip grating by an incident plane wave. The metal strips of the grating are characterized by a complex permittivity, with a large imaginary part to account for their finite conductivity. Such a scattering problem is formulated by the mode-matching method to determine the scattered fields everywhere, so that the volume distribution of current within a metal strip can be explicitly obtained, Numerical results are given to illustrate the effects of the dielectric constant of the surrounding media, as well as the incident angle and polarization on the current distribution induced by an incident plane wave. The air and metal modes form the basis for physical explanations of the numerical results obtained.
Edge currents on metal strip gratings
(1997)
Shiao, CM
;
Peng, ST
;
交大名義發表
;
電信工程研究所
;
National Chiao Tung University
We present here a rigorous analysis of current distribution induced on metal-strip grating by an incident plane wave. The grating is characterized by a complex permittivity, with a large imaginary part to account for the finite conductivity of the metal strips. Such a scattering problem is formulated by the method of mode matching to determine the scattered fields everywhere, so that the volume distribution of current within a metal strip can be explicitly obtained. In particular, in the cast of TE-mode incidence, edge currents on the metal. strips are examined, with respect to the conductivity and thickness of the grating as well as the incident wavelength. Our results agree well with those of the quasi-static approximation in the low-frequency limit, while noticeable deviations are observed in the high-frequency end.
Effect of finite conductivity on dispersion characteristics of grating waveguide
(1998-01-01)
Shiao, CM
;
Peng, ST
;
電信工程研究所
;
Institute of Communications Engineering
We present here a systematic investigation of dielectric waveguide loaded with a metal-strip grating which is realistically characterized by a complex dielectric constant with a negative imaginary part to account for the finite conductivity of the metal strips. The method of mode matching is employed to solve such a boundary-value problem, and the effects of the structure parameters on the dispersion characteristics are critically examined, with a particular attention directed toward the attenuation constant due to the Bragg reflection, radiation and absorption of the grating waveguide.
Effect of finite conductivity on dispersion characteristics of grating waveguide
(1998-01-01)
Shiao, CM
;
Peng, ST
;
電信工程研究所
;
Institute of Communications Engineering
We present here a systematic investigation of dielectric waveguide loaded with a metal-strip grating which is realistically characterized by a complex dielectric constant with a negative imaginary part to account for the finite conductivity of the metal strips. The method of mode matching is employed to solve such a boundary-value problem, and the effects of the structure parameters on the dispersion characteristics are critically examined, with a particular attention directed toward the attenuation constant due to the Bragg reflection, radiation and absorption of the grating waveguide.
Plane wave scattering by crossed metal-strip gratings
(1997)
Shiao, CM
;
Peng, ST
;
電信工程研究所
;
Institute of Communications Engineering
The plane-wave scattering by two crossed metal-strip gratings is formulated as a three-dimensional boundary-value problem, taking into account the polarization couplings. It is found that a large range of crossing angle between the two gratings will meet the shielding requirement in practice, regardless of the incident conditions.