Singularities of Floquet scattering solution for large cell spacings

The Floquet moment method (FMM) is useful for computing the scattering by periodic structures composed of complex shaped cells. However, when the period s is larger than 0.5 /spl lambda/, the computed field is singular at the grating lobe angles. In this paper, we demonstrate that these singularitie...

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Bibliographic Details
Published inIEEE transactions on antennas and propagation Vol. 52; no. 6; pp. 1609 - 1611
Main Authors Hao Liu, Paknys, R.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.06.2004
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Antenna arrays
Antennas
Brain modeling
Computation
Frequency selective surfaces
Gratings
Ground plane
Lobes
Mathematical models
Moment methods
Periodic structures
Permeability
Phased arrays
Scattering
Singularities
Strips
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Summary:The Floquet moment method (FMM) is useful for computing the scattering by periodic structures composed of complex shaped cells. However, when the period s is larger than 0.5 /spl lambda/, the computed field is singular at the grating lobe angles. In this paper, we demonstrate that these singularities have nothing to do with grating lobes, which are a physical phenomenon. Rather, they are a mathematical artifice of the FMM. This is demonstrated by modeling a flat ground plane with the FMM. We use a strip grating for the transverse magnetic case. The physical structure under investigation does not have any grating lobes, however the singular behavior can be made to appear and disappear by adjusting the cell spacing of the periodic structure.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2004.829415