Mathematics – Logic
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jeeea...3....8g&link_type=abstract
Journal of Electrical and Electronics Engineering, Australia (ISSN 0725-2986), vol. 3, March 1983, p. 8-17.
Mathematics
Logic
Antenna Radiation Patterns, Electromagnetic Measurement, Meteorological Satellites, Radio Telescopes, Satellite Antennas, Synchronous Satellites, Far Fields, Ground Effect (Communications), Japanese Spacecraft, Microwave Antennas, Signal Measurement
Scientific paper
The radiation diagram is one of the most important properties of any antenna. In the case of antennas with dimensions which are very large compared to the wavelength, radiation diagram measurements are difficult because a large antenna-source separation is needed to achieve far zone conditions. If the frequency is in the microwave range, several tens of kilometers may be needed. In connection with the necessity to achieve simultaneously freedom from ground effects, the requirements cannot be satisfied by a terrestrial source. The use of an artificial earth satellite as the source appears to represent a solution in such cases. The present investigation has the objective to illustrate with the aid of a case study the problems which arise in connection with such a solution. Attention is given to the measurement of the 64-m radiotelescope at Parkes in a procedure in which the Japanese Geostationary Meteorological Satellite was utilized as a source.
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