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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 (1999) In Technical Report LUTEDX/(TEAT-7082)/1-30/(1999) TEAT-7082.
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

plane waves, 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... (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

plane waves, 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 of the screen is increased. Finally

two complex geometries, hexagonal and tripole apertures, are studied. (Less)
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in
Technical Report LUTEDX/(TEAT-7082)/1-30/(1999)
volume
TEAT-7082
pages
30 pages
publisher
[Publisher information missing]
language
English
LU publication?
yes
id
bdde168b-cb3a-428d-9c93-dbb08b6251fc (old id 530487)
date added to LUP
2007-09-12 12:36:49
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2016-04-16 12:47:46
@misc{bdde168b-cb3a-428d-9c93-dbb08b6251fc,
  abstract     = {A plane wave impinges on a perfectly conducting thick screen perforated with<br/><br>
a periodic array of apertures with arbitrary cross-section. The transmission<br/><br>
and reflection coefficients are determined by a mode matching technique, earlier<br/><br>
used by other authors for the case where the apertures have the geometry<br/><br>
of a classical waveguide. The fields outside the screen are expanded in<br/><br>
plane waves, while the fields inside the apertures are expanded in waveguide<br/><br>
modes, obtained by the finite element method (FEM). Excellent agreement<br/><br>
between computed and measured transmission is found for a thick screen at<br/><br>
the X-band (8.2−12.4 GHz). Moreover, the present method and the spectral<br/><br>
Galerkin method (which assumes that the thickness of the screen is zero) is<br/><br>
compared for very thin screens, e.g., for a frequency selective surface (FSS).<br/><br>
Investigation of the thickness dependence is also done, and it is found that the<br/><br>
bandwidth decreases when the thickness of the screen is increased. Finally<br/><br>
two complex geometries, hexagonal and tripole apertures, are studied.},
  author       = {Widenberg, Björn and Poulsen, Sören and Karlsson, Anders},
  language     = {eng},
  pages        = {30},
  publisher    = {ARRAY(0x99400a8)},
  series       = {Technical Report LUTEDX/(TEAT-7082)/1-30/(1999)},
  title        = {Thick screens perforated with a periodic array of apertures with arbitrary cross-section},
  volume       = {TEAT-7082},
  year         = {1999},
}