Abstract
A closed-form high-frequency solution is presented for the near-field scattering by a thick screen illuminated by a line source at a finite distance. This solution is applicable to a thick screen with perfectly conducting side walls and either perfectly conducting or artificially soft boundary conditions on the face joining the two wedges. This latter condition is obtained in practice by etching on that face quarter of a wavelength deep corrugations with a small periodicity with respect to the wavelength. It is shown that the artificially soft surface provides a strong shadowing for both polarizations; thus, it is suggested that such configurations may usefully be employed to obtain an effective shielding from undesired interferences. Several numerical calculations have been carried out and compared with those from a method of moments (MoM) solution for testing the accuracy of our formulation, as well as to demonstrate the effectiveness of the corrugations in shielding arbitrarily polarized incident field.
Highlights
LECTROMAGNETIC interference between antennas and/or apparatuses operating in ;a constrained environment is a problem of increasing importance, especially for overcrowded space platforms
Limited spectrum availability often results in disturbances owing to the frequency sharing of radio communication signals [11
When the source and the observer are optically shadowed, a field coupling still occurs due to double diffraction (DD) mechanisms at the two nearby parallel edges of the screen
Summary
LECTROMAGNETIC interference between antennas and/or apparatuses operating in ;a constrained environment is a problem of increasing importance, especially for overcrowded space platforms. The near-field response of the second edge to each cylindrical spectral source is used to obtain a double-integral representation for the doubly diffracted field [6].In Section 111, this integral is asymptotically evaluated to find the desired closed-form (ray-optical) expressions. This asymptotic evaluation leads to transition functions involving generalized Fresnel integrals (GFI) [161,. The shielding effectiveness of the corrugated screen is discussed; it is shown that when the screen thickness decreases, our solution fails so gracefully that it even recovers the field of a half-plane for vanishing thickness
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