Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981marrv..44..244m&link_type=abstract
Marconi Review, vol. 44, 4th Quarter, 1981, p. 244-269.
Astronomy and Astrophysics
Astronomy
1
Data Correlation, Electromagnetic Noise Measurement, Microwave Antennas, Noise Temperature, Power Gain, Radio Stars, Error Analysis, Figure Of Merit, Noise Spectra, Radio Astronomy, Sidelobe Reduction
Scientific paper
It is demonstrated that the difficulties associated with measurements of G/T (the ratio of antenna pattern gain to effective system noise temperature) for small antennas can be overcome by using an auxiliary antenna in an interferometric mode. The increased sensitivity, compared to the normal radiometer method, and the freedom from interference permits the measurement of antenna G/T at angles other than on main beam axis, thereby realizing the relative antenna power pattern. The method is particularly applicable for low level sidelobes; it is shown that levels as low as -20 dBi can be measured with reasonable accuracy providing the auxiliary antenna itself has a satisfactory figure of merit and exhibits low sidelobes.
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