Scattering from loaded grooves

Scattering from Loaded Grooves

Electromagnetic scattering from a two-dimensional groove recessed in an arbitrarily thick conducting screen is studied. The groove may be empty or loaded with a lossy material which may or may not completely fill the cavity. For the partially loaded groove, the filling material is assumed electrically dense so that the standard impedance boundary condition is applicable at the top surface of th...

Scattering of Solar Flux by Panel Grooves

The amount of scattering of solar radiation by grooves machined into the surfaces of the MMA antenna panels is estimated. Circular cross-section grooves are found to be much more effective than triangular grooves since they scatter over a wider range of angles. The groove pitch should be comparable to or smaller than the wavelength at the highest operating frequency, or about 100300 μm, and ha...

Scattering of Solar Flux by Panel Grooves: Update

Fine grooves machined into the surface panels of an antenna help to scatter solar radiation. In an earlier memo it was concluded that a circular profile for the grooves was superior to a triangular. After correcting some errors in that note the triangular grooves appear to be more effective. The corrected formulation and some additional comments are presented here.

Strange Grooves

Comparative study of surface plasmon scattering by shallow ridges and grooves

We revisit the scattering of surface plasmons by shallow surface defects for both protrusions and indentations of various lengths, which are deemed infinite in one dimension parallel to the surface. Subwavelength protrusions and indentations of equal shape present different scattering coefficients when their height and width are comparable. In this case, a protrusion scatters plasmons like a ve...