G/T and noise figure of active array antennas
- 1 February 1993
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Antennas and Propagation
- Vol. 41 (2) , 241-244
- https://doi.org/10.1109/8.214619
Abstract
A figure of merit, G/T, for a multichannel active array antenna was derived, and the effects of the beamforming network on the overall noise figure of the system were studied. Also examined are the dependence of the noise figure on various losses, and the difference between a resistive and nonresistive taper in the combining network. When the amplifier gain is sufficiently large, the losses following the LNA can usually be ignored. For a photonic array with lossy time shift elements, however, the downstream losses become significant. Also, if resistive tapering is employed, not only the array gain but also the noise figure will be degraded by the collective effect of the feed network.<>Keywords
This publication has 4 references indexed in Scilit:
- Gain measurement for active arraysPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- The first demonstration of an optically steered microwave phased array antenna using true-time-delayJournal of Lightwave Technology, 1991
- Further comments on the definition of antenna gainIEEE Antennas and Propagation Society Newsletter, 1989
- Microwave Antenna Theory and DesignPublished by Institution of Engineering and Technology (IET) ,1984