Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991itap...39.1575e&link_type=abstract
IEEE Transactions on Antennas and Propagation (ISSN 0018-926X), vol. 39, Nov. 1991, p. 1575-1586.
Astronomy and Astrophysics
Astronomy
5
Far Fields, Green'S Functions, Horn Antennas, Method Of Moments, Millimeter Waves, Cross Polarization, Gallium Arsenides, Plasma Diagnostics, Radio Astronomy, Remote Sensing
Scientific paper
Full-wave analysis is employed to determine the far-field pattern and input impedance of a dipole-fed horn antenna in a ground plane, and the theoretical results are compared with mm-wave and microwave data. The theoretical work exploits the Green's function corresponding to the horn structure and the method of moments. It is determined that the horn should have 70 sections/wavelength and 50 secondary modes for optimized accuracy, and certain dipole positions can reduce the resonance to zero. The experimentally derived impedance and radiation patterns agree with the constraints developed theoretically. The 70-degree flare-angle horn with selected dipole positions and horn apertures yields good radiation patterns, cross-polarization levels, and resonant dipole impedances. The conclusions are of interest to the development of the horn antennas etched in Si/GaAs for applications to zero-visibility tracking, radio astronomy, plasma diagnostics, and remote sensing.
Ali-Ahmad Walid Y.
Eleftheriades George V.
Katehi Linda P. B.
Rebeiz Gabriel M.
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