Journal ArticleDOI
Rim loaded reflector antennas
O. Bucci,G. Franceschetti +1 more
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TLDR
A general theory of reflector antennas loaded by surface impedances is presented in this paper, where the spatial variation of primary illumination is taken into account using a generalized slope diffraction coefficient.Abstract:
A general theory of reflector antennas loaded by surface impedances is presented. Spatial variation of primary illumination is taken into account using a generalized slope diffraction coefficient. The theory is experimentally checked on surface loaded square plate scatterers and then used for computing the radiation diagram of parabolic and hyperbolic dishes. Computer programs and computed diagrams refer to the case of focal illumination and negligible tapering of primary illumination.read more
Citations
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Patent
Radome attachment band clamp
TL;DR: In this paper, a band clamp for coupling a radome to a distal end of a reflector antenna for improving the front-to-back ratio (F2R) was proposed.
Journal ArticleDOI
A uniform GTD formulation for the diffraction by a wedge with impedance faces
TL;DR: In this article, a uniform high-frequency solution is presented for the diffraction by a wedge with impedance faces illuminated by a plane wave perpendicularly incident on its edge, and both the transverse electric (TE) and transverse magnetic (TM) cases are considered.
Patent
Reflector antenna radome attachment band clamp
TL;DR: In this paper, a band clamp for coupling a radome to a distal end of a reflector dish for improving the front to back ratio of the reflector antenna is proposed. But the band clamp is not suitable for the use of a single antenna.
Patent
Low sidelobe resistive reflector antenna
TL;DR: In this paper, the surface current density near the edges of a parabolic reflector antenna is tapered by placing tapered resistive edge loads on the reflector for gradually decreasing the conductivity from the center of a reflector to the edge.
Journal ArticleDOI
Electromagnetic diffraction of an obliquely incident plane wave field by a wedge with impedance faces
TL;DR: In this paper, a uniform asymptotic solution for the electromagnetic diffraction by a wedge with impedance faces and with included angles equal to 0 (half-plane), pi /2 (right-angled wedge), pi (two-part plane) and 3 pi / 2 (rightangled wedge).
References
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Journal ArticleDOI
The definition of cross polarization
TL;DR: There are at least three different definitions of cross polarization used in the literature, and the definition which corresponds to one standard measurement practice is proposed as the best choice.
Journal ArticleDOI
Diffraction by an Aperture
TL;DR: In this paper, the geometrical theory of diffraction was introduced to account for diffraction by introducing new rays called diffracted rays, which are produced when incident rays hit the aperture edge.
Journal Article
Excitation, Reflection and Emission of Surface Waves from a Wedge with Given Face Impedances
Journal ArticleDOI
Impedance boundary conditions for imperfectly conducting surfaces
TL;DR: In this article, the exact electromagnetic boundary conditions at the surface of a material of large refractive index can be approximated to yield the usual impedance or Leontovich boundary conditions, which are valid for surfaces whose radii of curvature are large compared with the penetration depth.
Journal ArticleDOI
A uniform asymptotic theory of electromagnetic diffraction by a curved wedge
Shung-Wu Lee,G. Deschamps +1 more
TL;DR: In this paper, the diffracted field according to Keller's geometrical theory of diffraction (GTD) can be expressed in a particularly simple form by making use of rotations of the incident and reflected fields about the edge.
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