A theoretical and experimental investigation of antenna near-field effects as applied to incoherent backscatter measurements of Arecibo

Details A theoretical and experimental investigation of antenna near-field effects as applied to incoherent backscatter measurements of Arecibo A theoretical and experimental investigation of antenna near-field effects as applied to incoherent backscatter measurements of Arecibo

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..449b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 44, May 1982, p. 449-454.

Physics

14

Antenna Radiation Patterns, Backscattering, Fresnel Region, Incoherent Scattering, Near Fields, Radar Scattering, Antenna Design, Antenna Feeds, Electromagnetic Scattering, Far Fields, Reflectors

Scientific paper

The 'near-field' (or Fresnel zone) properties of the Arecibo spherical reflector and 430 MHz line feed have been investigated along with the influence of these properties on incoherent backscatter determinations of lower ionosphere electron concentrations. The form of the classical radar equation used for incoherent backscatter measurements is reviewed and this form of the equation with range dependent gain is related to experimentally accessible far-field beam pattern measurements. Near-field characteristics are investigated from a theoretical viewpoint which is justified via far-field agreement between a theoretical antenna model and experiment. It is concluded that in the Arecibo case the 'near-field correction' to the appropriate far-field radar equation is no more than 20% at a range of 50 km. Beam patterns which are optimum for incoherent backscatter applications are also discussed.

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