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Thick screens perforated with a periodic array of apertures with arbitrary cross-section

Widenberg, Björn LU ; Poulsen, Sören LU and Karlsson, Anders LU (2000) In Journal Electromagnetic Waves and Applications 14(9). p.28-1303
Abstract
A plane wave impinges on a perfectly conducting thick screen perforated with a periodic array of apertures with arbitrary cross-section. The transmission and reflection coefficients are determined by a mode matching technique, earlier used by other authors for the case where the apertures have the geometry of a classical waveguide. The fields outside the screen are expanded in Floquet modes, while the fields inside the apertures are expanded in waveguide modes, obtained by the finite element method (FEM). Excellent agreement between computed and measured transmission is found for a thick screen at the X-band (8.2-12.4 GHz). Moreover, the present method and the spectral Galerkin method (which assumes that the thickness of the screen is... (More)
A plane wave impinges on a perfectly conducting thick screen perforated with a periodic array of apertures with arbitrary cross-section. The transmission and reflection coefficients are determined by a mode matching technique, earlier used by other authors for the case where the apertures have the geometry of a classical waveguide. The fields outside the screen are expanded in Floquet modes, while the fields inside the apertures are expanded in waveguide modes, obtained by the finite element method (FEM). Excellent agreement between computed and measured transmission is found for a thick screen at the X-band (8.2-12.4 GHz). Moreover, the present method and the spectral Galerkin method (which assumes that the thickness of the screen is zero) is compared for very thin screens, e.g., for a frequency selective surface (FSS). Investigation of the thickness dependence is also done, and it is found that the bandwidth decreases when the thickness dependence is also done, and it is found that the bandwidth decreases when the thickness of the screen is increased. Finally two complex geometries, hexagonal and tripole apertures, are studied. (Less)
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Contribution to journal
publication status
published
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in
Journal Electromagnetic Waves and Applications
volume
14
issue
9
pages
28 - 1303
publisher
VSP BV
ISSN
1569-3937
language
English
LU publication?
yes
id
19119166-24ca-4d7a-bf25-d598b5e40a90 (old id 144431)
date added to LUP
2007-07-11 09:51:08
date last changed
2016-10-11 08:38:56
@article{19119166-24ca-4d7a-bf25-d598b5e40a90,
  abstract     = {A plane wave impinges on a perfectly conducting thick screen perforated with a periodic array of apertures with arbitrary cross-section. The transmission and reflection coefficients are determined by a mode matching technique, earlier used by other authors for the case where the apertures have the geometry of a classical waveguide. The fields outside the screen are expanded in Floquet modes, while the fields inside the apertures are expanded in waveguide modes, obtained by the finite element method (FEM). Excellent agreement between computed and measured transmission is found for a thick screen at the X-band (8.2-12.4 GHz). Moreover, the present method and the spectral Galerkin method (which assumes that the thickness of the screen is zero) is compared for very thin screens, e.g., for a frequency selective surface (FSS). Investigation of the thickness dependence is also done, and it is found that the bandwidth decreases when the thickness dependence is also done, and it is found that the bandwidth decreases when the thickness of the screen is increased. Finally two complex geometries, hexagonal and tripole apertures, are studied.},
  author       = {Widenberg, Björn and Poulsen, Sören and Karlsson, Anders},
  issn         = {1569-3937},
  language     = {eng},
  number       = {9},
  pages        = {28--1303},
  publisher    = {VSP BV},
  series       = {Journal Electromagnetic Waves and Applications},
  title        = {Thick screens perforated with a periodic array of apertures with arbitrary cross-section},
  volume       = {14},
  year         = {2000},
}