Efficiencies and System Temperature for a Beamforming Array

For an active beamforming array, standard definitions for efficiencies and system temperature are not available. We use noise considerations to generalize the single-antenna conventions for aperture efficiency, spillover efficiency, radiation efficiency, and system temperature to arrays. The treatme...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2008, Vol.7, p.565-568
Main Authors: Warnick, K.F., Jeffs, B.D.
Format: Article
Language:English
Subjects:
Amplifier noise
antenna array feeds
Antenna arrays
antenna efficiency
Antenna feeds
Apertures
Array signal processing
Circuit noise
Mutual coupling
Phased arrays
Receiving antennas
Temperature
Voltage
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Summary:For an active beamforming array, standard definitions for efficiencies and system temperature are not available. We use noise considerations to generalize the single-antenna conventions for aperture efficiency, spillover efficiency, radiation efficiency, and system temperature to arrays. The treatment leads to a new noise matching efficiency that quantifies the effect of mutual coupling on amplifier noise. Numerical results for a phased array feed indicate that the noise increase caused by mutual coupling can be significant.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2008.2001752