Bandwidth limits of beamforming networks for low-noise focal-plane arrays
- 10 January 2005
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Antennas and Propagation
- Vol. 53 (1) , 450-454
- https://doi.org/10.1109/TAP.2004.838781
Abstract
Future radio telescopes will use arrays of closely-spaced antenna elements at the focal plane. The outputs from the elements will feed a beamforming network which will produce multiple beams. With a simple beamforming network the weights applied to the element outputs will be independent of frequency, resulting in a frequency-dependent feed pattern. We show, with results from numerical simulations, that the signal-to-noise ratio of a focal-plane array will be degraded with moderate bandwidths. We also briefly discuss ways to mitigate this effect.Keywords
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