Power densities in the near field of a large antenna focused to infinity

Author

Tomiyasu, K.

Author_Institution

Lockheed Martin Corp., Philadelphia, PA, USA

Volume

45

Issue

1

fYear

1997

fDate

1/1/1997 12:00:00 AM

Firstpage

181

Lastpage

183

Abstract

At low-beam elevation angles, measurements of microwave propagation from satellite to ground have exhibited large variations in signal strength under clear weather and cloudy conditions. Large nonuniformities in the three-dimensional (3-D) near-field region of an antenna focused to infinity have been computed. These field nonuniformities interacting with a dynamic turbulent troposphere can introduce phase errors at the antenna aperture, resulting in signal scintillation and loss

Keywords

aperture antennas; microwave propagation; satellite links; tropospheric electromagnetic wave propagation; 3D near-field region; antenna aperture; antenna focused to infinity; clear weather; cloudy conditions; dynamic turbulent troposphere; field nonuniformities; large antenna; low-beam elevation angles; microwave propagation; phase errors; power densities; satellite-ground path; signal loss; signal scintillation; signal strength; Antenna accessories; Antenna measurements; Antennas and propagation; Aperture antennas; Bismuth; Extraterrestrial measurements; H infinity control; Microwave propagation; Optimized production technology; Satellites;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.554259

Filename

554259