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

In English

Författare

Summary, in English

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.

Publiceringsår

1999

Språk

Engelska

Publikation/Tidskrift/Serie

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

Dokumenttyp

Rapport

Förlag

[Publisher information missing]

Ämne

  • Electrical Engineering, Electronic Engineering, Information Engineering
  • Other Electrical Engineering, Electronic Engineering, Information Engineering

Status

Published

Report number

TEAT-7082

Forskningsgrupp

  • Electromagnetic theory