Electromagnetic reflection and transmission at interfaces involving graded dielectrics with applications to planetary radar astronomy

Details Electromagnetic reflection and transmission at interfaces involving graded dielectrics with applications to planetary radar astronomy Electromagnetic reflection and transmission at interfaces involving graded dielectrics with applications to planetary radar astronomy

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976itap...24...17s&link_type=abstract

IEEE Transactions on Antennas and Propagation, vol. AP-24, Jan. 1976, p. 17-24.

Astronomy and Astrophysics

Astronomy

5

Dielectrics, Electromagnetic Wave Transmission, Planetary Surfaces, Radar Astronomy, Wave Reflection, Boundary Value Problems, Half Spaces, Permittivity, Polarization Characteristics, Radar Transmission, Remote Sensors

Scientific paper

Reflection and transmission of electromagnetic waves at an interface between two homogeneous materials is modified when a transition zone of linearly increasing permittivity is inserted between the half spaces. Mathematical expressions for reflection and transmission coefficients are derived for waves at arbitrary incidence angles and polarized either in or perpendicular to the plane of incidence. Discontinuities in permittivity at the transition-zone boundaries are allowed. There is efficient transmission between the two half-spaces for transition-zone thicknesses of a wavelength or greater. For sharper changes, the matching layer has diminishing effect and the wave-interface interaction is characterized by the difference in properties between the two half-spaces. Examples applicable to lunar radar astronomy and airborne terrestrial remote sensing are used to illustrate the relationship between wavelength and thickness of the transition layer.

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