Title :
Diffraction of an electromagnetic beam by infinite planar periodic metal-strip grating
Author :
Gimeno, B. ; Diez, A. ; Navasquillo, J. ; Pomer, F.
Author_Institution :
Dept. de Fisica Aplicada, Valencia Univ., Spain
fDate :
3/1/1995 12:00:00 AM
Abstract :
An hybrid angular spectrum method-Galerkin moment procedure has been developed to analyze the diffraction of an electromagnetic beam incident obliquely on an infinite planar periodic metal-strip grating. The integral expression obtained for the scattered field is expanded by means of an asymptotic method for determining the diffracted far-field. Some numerical examples show the decomposition of the incident beam in several beams corresponding to the propagating Floquet harmonics excited in the grating. The propagation directions of these beams show deviations with respect to the directions predicted by the Floquet theorem. The profile of the scattered far-field is analyzed as a function of the geometrical and electrical parameters
Keywords :
Galerkin method; diffraction gratings; electromagnetic fields; electromagnetic wave diffraction; electromagnetic wave scattering; method of moments; spectral analysis; Floquet theorem; Galerkin moment procedure; angular spectrum method; asymptotic method; diffracted far-field; electrical parameters; electromagnetic beam diffraction; electromagnetic wave scattering; geometrical parameters; hybrid method; incident beam; infinite planar periodic metal-strip grating; integral equation; propagating Floquet harmonics; propagation directions; scattered far-field; scattered field; Antennas and propagation; Beams; Broadband antennas; Diffraction gratings; Electromagnetic diffraction; Electromagnetic propagation; Electromagnetic scattering; Electrons; Frequency selective surfaces; Microstrip antennas;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
